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Exhibit 99.4

AMTP Shares Transition Agreement

Nuveen Municipal High Income Opportunity Fund

and

▇▇▇▇� Fargo Municipal Capital Strategies, LLC

AprilÌý3, 2023

CONTENTS

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AMTP SHARES TRANSITION AGREEMENT dated as of AprilÌý3, 2023, between NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND, a closed-end fund organized as a Massachusetts business trust (the â€�Fundâ€�), and ▇▇▇▇â–� FARGO MUNICIPAL CAPITAL STRATEGIES, LLC, organized and existing under the laws of Delaware, including its successors by merger or operation of law, as acquirer of the AMTP Shares hereunder (â€�▇▇▇▇â–� Fargoâ€�).

WHEREAS, on AprilÌý19, 2021, the Fund authorized and issued pursuant to the Statement (as defined below) to DB Municipal Holdings LLC (â€Æàµþâ€�) its Adjustable Rate MuniFund Term Preferred Shares, Series 2031, each with a liquidation preference of $100,000 per share, as set forth on Schedule 1 hereto, which are subject to this Agreement (the AMTP Sharesâ€�);

WHEREAS, the terms of the AMTP Shares are governed by and set forth in the Statement Establishing and Fixing the Rights and Preferences of the 2031 AMTP Shares, including Appendix A thereto, as the same may be amended, restated, supplemented or otherwise modified from time to time in accordance with the terms thereof and hereof (the �Statement�);

WHEREAS, the Statement currently provides for a Scheduled Termination Date (as such term is defined in the Statement) for the AMTP Shares on AprilÌý19, 2023 pursuant to Supplement No.Ìý1 to Appendix A to the Statement;

WHEREAS, the Statement provides that the Fund shall have the right to request that DB extend the Scheduled Termination Date for an additional period;

WHEREAS, the Fund made such request to DB and DB informed the Fund that it does not wish to further extend the Scheduled Termination Date;

WHEREAS, the Statement provides that the Fund, at its option, may seek to transfer all of the outstanding AMTP Shares to a Third Party Purchaser pursuant to a Transition;

WHEREAS, the Fund has determined to exercise its right under the Statement to effect a Transition of the AMTP Shares to ▇▇▇▇� Fargo as the Third Party Purchaser;

WHEREAS, in connection with the Transition, ▇▇▇▇â–� Fargo has authorized the (1)Ìýtransfer of the Third Party Purchase Price to the Securities Depository in connection with the Transition, and (2)Ìýacceptance of the AMTP Shares in exchange for the Third Party Purchase Price;

WHEREAS, as an inducement to ▇▇▇▇� Fargo to accept the AMTP Shares in connection with the Transition of the AMTP Shares from DB to ▇▇▇▇� Fargo, the Fund now desires to enter into this Agreement to set forth certain representations, warranties, covenants and agreements regarding the Fund and the AMTP Shares; and

WHEREAS, as an inducement to the Fund to effect the Transition of the AMTP Shares from DB to ▇▇▇▇� Fargo, ▇▇▇▇� Fargo desires to enter into this Agreement to set forth certain representations, warranties, covenants and agreements regarding ▇▇▇▇� Fargo and the AMTP Shares.

NOW, THEREFORE, in consideration of the respective agreements contained herein, the parties hereto agree as follows:

ARTICLE I

DEFINITIONS

The following terms, as used herein, have the following meanings:

�2023 Transition� means the Transition of the AMTP Shares from DB to ▇▇▇▇� Fargo as facilitated by the Settlement Agent and Securities Depository as of the Effective Date.

“Accredited Investor� has the meaning set forth in the Statement.

“Additional Amount Payment� has the meaning set forth in the Statement.

“Adjusted Dividend Amount� has the meaning set forth in the Statement.

“Adjusted Terms� has the meaning set forth in the Statement.

“Agent Member� has the meaning set forth in the Statement.

“A²µ°ù±ð±ð³¾±ð²Ô³Ùâ€� means this AMTP Shares Transition Agreement, dated as of AprilÌý3, 2023, as the same may be amended, restated, supplemented or otherwise modified from time to time in accordance with the terms hereof.

�AMTP Shares� has the meaning set forth in the recitals to this Agreement.

�Asset Coverage� has the meaning set forth in the Statement.

“B²¹²Ô°ì²õâ€� has the meaning set forth in the Statement.

“Board of Trustees� has the meaning set forth in the Statement.

“Business Day� has the meaning set forth in the Statement.

“B²â-³¢²¹·É²õâ€� means the By-Laws of the Fund as amended from time to time.

“C±ô´Ç²õ±ð»å-·¡²Ô»å ¹ó³Ü²Ô»å²õâ€� has the meaning set forth in the Statement

“C´Ç»å±ðâ€� has the meaning set forth in the Statement.

“Common Shares� has the meaning set forth in the Statement.

�Custodian� has the meaning set forth in the Statement.

â€Æàµþâ€� has the meaning set forth in the preamble to this Agreement.

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â€Æà±ð³¦±ô²¹°ù²¹³Ù¾±´Ç²Ôâ€� has the meaning set forth in the Statement.

“Derivative Contractâ€� means (a)Ìýany and all rate swap transactions, basis swaps, credit derivative transactions, forward rate transactions, commodity swaps, commodity options, forward commodity contracts, equity or equity index swaps or options, bond or bond price or bond index swaps or options or forward bond or forward bond price or forward bond index transactions, repurchase transactions, interest rate options, forward foreign exchange transactions, cap transactions, floor transactions, collar transactions, currency swap transactions, cross-currency rate swap transactions, currency options, spot contracts, or any other similar transactions or any combination of any of the foregoing (including any options to enter into any of the foregoing), whether or not any such transaction is governed by or subject to any master agreement, and (b)Ìýany and all transactions of any kind, and the related confirmations, which are subject to the terms and conditions of, or governed by, any form of master agreement published by the International Swaps and Derivatives Association, Inc., any International Foreign Exchange Master Agreement, or any other master agreement, including any such obligations or liabilities under any such master agreement.

�Designated Owner� means a Person in whose name AMTP Shares are recorded as beneficial owner of such AMTP Shares by the Securities Depository, an Agent Member or other securities intermediary on the records of such Securities Depository, Agent Member or securities intermediary, as the case may be.

“Dividend Amount� has the meaning set forth in the Statement.

“Dividend Payment Date� has the meaning set forth in the Statement.

“Due Diligence Request� means the due diligence request letter from ▇▇▇▇▇▇� and ▇▇▇▇▇▇ LLP.

“Effective Date� means the date on which the 2023 Transition is effected subject to the satisfaction or waiver of the conditions specified in Article III.

“Effective Leverage Ratio� has the meaning set forth in the Statement.

�Eligible Assets� means the instruments in which the Fund may invest as described in EXHIBIT B to this Agreement, which may be amended from time to time with the prior written consent of ▇▇▇▇� Fargo.

“Eligible Repurchase Agreement Counterpartyâ€� means an entity that (i)Ìýis a QIB or an Accredited Investor and (ii)Ìýhas entered into a repurchase agreement with ▇▇▇▇â–� Fargo with respect to the AMTP Shares either directly or via a tri-party arrangement utilizing a third-party agent.

“F²¹¾±±ô³Ü°ù±ðâ€� has the meaning set forth in SectionÌý2.4.

“Fee Rate� means initially 0.25% per annum, which shall be subject to increase by 0.25% per annum for each Week in respect of which any Failure has occurred and is continuing.

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“F¾±³Ù³¦³óâ€� means Fitch Ratings, a part of the Fitch Group, or any successor or successors thereto.

â€�Force Majeure ·¡³æ³¦±ð±è³Ù¾±´Ç²Ôâ€� means any failure or delay in the performance of the Fund’s reporting obligation pursuant to SectionÌý2.4 arising out of or caused, directly or indirectly, by circumstances beyond its reasonable control, including, without limitation, acts of God; earthquakes; flood; terrorism; wars and other military disturbances; sabotage; epidemics; riots; loss or malfunctions of utilities, computer (hardware or software) or communication services; accidents; acts of civil or military authority and governmental action. The Fund shall use commercially reasonable efforts to commence performance of its obligations during any of the foregoing circumstances.

“F³Ü²Ô»åâ€� has the meaning set forth in the preamble to this Agreement.

“H´Ç±ô»å±ð°ùâ€� has the meaning set forth in the Statement.

The word “i²Ô³¦±ô³Ü»å¾±²Ô²µâ€� means “including without limitation.â€�

“Indemnified Personsâ€� means ▇▇▇▇â–� Fargo and its affiliates and directors, officers, partners, employees, agents, representatives and control persons, entitled to indemnification by the Fund under SectionÌý8.3.

�Investment Adviser� means Nuveen Fund Advisors, LLC, or any successor company or entity.

�Liquidation Preference� means, with respect to a given number of AMTP Shares, $100,000 times that number.

“Majority Participants� means the Holder(s) of more than 50% of the Outstanding AMTP Shares.

“Managed Assets� means the Fund’s net assets, including assets attributable to any principal amount of any borrowings (including the issuance of commercial paper, reverse repurchase agreements or notes) or preferred stock outstanding. For the avoidance of doubt, assets attributable to borrowings includes the portion of the Fund’s assets in a tender option bond trust of which the Fund owns the residual interest (without regard to the value of the residual interest to avoid double counting).

�Mandatory Tender� has the meaning set forth in the Statement.

�Market Value� has the meaning set forth in the Statement.

�Moody�s� means ▇▇▇▇▇’▇ Investors Service, Inc., and any successor or successors thereto.

“Moody’s Guidelines� means the guidelines, if any, as may be amended from time to time, in connection with ▇▇▇▇▇’▇ ratings of the AMTP Shares.

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�1940 Act� means the Investment Company Act of 1940, as amended.

“N¸é³§¸é°¿â€� has the meaning set forth in the Statement.

â€�Nuveen Personsâ€� means the Investment Adviser or any affiliated person of the Investment Adviser (as defined in SectionÌý2(a)(3) of the 1940 Act) (other than the Fund, in the case of a redemption or purchase of the AMTP Shares which are to be cancelled within ten (10)Ìýdays of purchase by the Fund).

“Offering Memorandumâ€� means the Offering Memorandum of the Fund relating to the 2023 Transition of the AMTP Shares, dated AprilÌý3, 2023, as the same may be amended, revised or supplemented from time to time.

The word �or� is used in its inclusive sense.

“Other Rating Agency� means, at any time, each NRSRO, if any, other than Moody’s then providing a rating for the AMTP Shares pursuant to the request of the Fund.

“Other Rating Agency Guidelines� means the guidelines provided by each Other Rating Agency, as may be amended from time to time, in connection with the Other Rating Agency’s rating of the AMTP Shares.

“O³Ü³Ù²õ³Ù²¹²Ô»å¾±²Ô²µâ€� has the meaning set forth in the Statement.

“P±ð°ù²õ´Ç²Ôâ€� has the meaning set forth in the Statement.

“Preferred Shares� has the meaning set forth in the Statement.

‾»±õµþâ€� means a “qualified institutional buyerâ€� as defined in Rule 144A under the Securities Act.

“Rate Period� has the meaning set forth in the Statement.

“Rating Agency� means Moody’s (if ▇▇▇▇▇’▇ is then rating the AMTP Shares), and/or any Other Rating Agency.

“Rating Agency Guidelines� means the Moody’s Guidelines and/or any Other Rating Agency Guidelines as they exist from time to time.

“Redemption and Paying Agent� means Computershare Inc. and Computershare Trust Company N.A., collectively, or with the prior written consent of ▇▇▇▇� Fargo (which consent shall not be unreasonably withheld), any successor Person, which has entered into an agreement with the Fund to act in such capacity as the Fund’s tender agent, transfer agent, registrar, dividend disbursing agent, paying agent and redemption price disbursing agent and calculation agent in connection with the payment of regularly scheduled dividends with respect to AMTP Shares.

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“Related Documents� means this Agreement, the Declaration, the Statement, the AMTP Shares and the By-Laws.

“Reporting Dateâ€� has the meaning set forth in SectionÌý6.1(o).

“Reporting Failureâ€� has the meaning set forth in SectionÌý2.4.

â€ÂÙ&²¹³¾±è;±Êâ€� means StandardÌý& Poor’s Ratings Services, a StandardÌý& Poor’s Financial Services LLC business, and any successor or successors thereto.

“Securities Act� means the U.S. Securities Act of 1933, as amended.

“Securities Depository� means The Depository Trust Company, New York, New York, and any substitute for or successor to such securities depository that shall maintain a book-entry system with respect to the AMTP Shares.

“Settlement Agent� means, with respect to the AMTP Shares subject to the 2023 Transition, Computershare Inc. and Computershare Trust Company N.A., collectively, acting in their capacity as an agent of the Fund to accept such AMTP Shares and to facilitate the settlement of the Third Party Purchase of such AMTP Shares.

�Statement� means the Statement Establishing and Fixing the Rights and Preferences of Adjustable Rate MuniFund Term Preferred Shares, Series 2031, as the same may be amended, restated, supplemented or otherwise modified from time to time in accordance with the terms thereof and hereof.

â€Âٳܲú-´¡»å±¹¾±²õ±ð°ùâ€� means Nuveen Asset Management, LLC, the Fund’s sub-adviser, which is a subsidiary of the Investment Adviser.

“Third Party Purchase� has the meaning set forth in the Statement.

“Third Party Purchase Price� has the meaning set forth in the Statement.

“T°ù²¹²Ô²õ¾±³Ù¾±´Ç²Ôâ€� has the meaning set forth in the Statement.

“Voting Trustâ€� has the meaning set forth in SectionÌý2.3(a).

“Withdrawing Rating Agencyâ€� has the meaning set forth in SectionÌý6.16 of this Agreement.

“▇▇▇▇▇ Fargo� has the meaning set forth in the preamble to the Agreement.

â€�Weekâ€� means a period of seven (7)Ìýconsecutive calendar days.

“w°ù¾±³Ù³Ù±ð²Ôâ€� or “in writingâ€� means any form of written communication, including communication by means of telex, telecopier or electronic mail.

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Each capitalized term used herein and not otherwise defined herein shall have the meaning provided therefor (including by incorporation by reference) in the Related Documents.

ARTICLE II

PURCHASE AND TRANSFER; EXPENSES; ADDITIONAL FEE

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The Fund shall pay amounts due to be paid by it hereunder (including any incidental expenses) as operating expenses.

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For so long as ▇▇▇▇â–� Fargo is a Holder or Designated Owner of any Outstanding AMTP Shares, if the Fund fails to comply with the reporting requirements set forth in SectionsÌý6.1(o) and 6.1(p) hereof (except as a result of a Force Majeure Exception) and such failure is not cured within three (3)ÌýBusiness Days after written notification to the Fund by ▇▇▇▇â–� Fargo of such failure (a â€�Reporting Failureâ€�), the Fund shall pay to ▇▇▇▇â–� Fargo on the Dividend Payment Date occurring in the month immediately following a month in which such Reporting Failure (a â€�Failureâ€�) continues a fee, calculated in respect of each Week (or portion thereof) during such month in respect of a Failure and beginning on the date of such Failure, equal to the product of (a)Ìýthe Fee Rate, times (b)Ìýthe aggregate average daily Liquidation Preference of the AMTP Shares held by ▇▇▇▇â–� Fargo during such Week or portion thereof, times (c)Ìýthe quotient of the number of days in such Week or portion thereof divided by the number of calendar days in the year in which such Week or portion thereof occurs. If such fee is an “other distributionâ€� pursuant to the Statement, such fee shall be paid pursuant to and in accordance with the Statement, including SectionÌý2.2(c) of the Statement. Notwithstanding the foregoing, in no event shall (i)Ìýthe fee payable pursuant to this SectionÌý2.4 hereunder for any Week plus the Dividend Amount on the AMTP Shares for such Week exceed an amount exclusive of any Additional Amount Payment equal to the product of (x)Ìý5.90%, times (y)Ìýthe aggregate average daily Liquidation Preference of the AMTP Shares held by ▇▇▇▇â–� Fargo during such Week or portion thereof, times (z)Ìýthe quotient of the number of days in such Week or portion thereof divided by the number of calendar days in the year in which such Week or portion thereof occurs; (ii)Ìýthe fee payable pursuant to this SectionÌý2.4 for any Week plus the Dividend Amount accumulated for the AMTP Shares for such Week exceed an amount equal to the product of (aa)Ìý15%, times (bb)Ìýthe aggregate average daily Liquidation Preference of the AMTP Shares held by ▇▇▇▇â–� Fargo during such Week or portion thereof, times (cc)Ìýthe quotient of the number of days in such Week or portion thereof divided by the number of calendar days in the year in which such Week or portion thereof occurs; (iii)Ìýthe Fund be required to calculate or pay a fee in respect of more than one Failure in

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any Week; or (iv)Ìýany payment be made under this SectionÌý2.4 that would cause the Fund to violate the terms of any series of its outstanding Preferred Shares as a result of the Fund’s failure to have paid any distribution then required to be paid on any series of its outstanding Preferred Shares, provided that the Fund shall pay all accrued and unpaid amounts otherwise payable under this SectionÌý2.4 when such amounts may be paid under the terms of its outstanding Preferred Shares following the cure of any such failure to pay distributions thereunder.

ARTICLE III

CONDITIONS TO EFFECTIVE DATE

It shall be a condition to the Effective Date that each of the following conditions shall have been satisfied or waived as of such date, and upon such satisfaction or waiver, this Agreement shall be effective:

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The Fund and ▇▇▇▇� Fargo agree that consummation of the 2023 Transition of the AMTP Shares pursuant to this Agreement shall constitute acknowledgment that the foregoing conditions have been satisfied or waived.

ARTICLE IV

REPRESENTATIONS AND WARRANTIES OF THE FUND

The representations and warranties set out in this Article IV are given hereunder by the Fund to Wells Fargo as of the Effective Date.

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The Fund is existing and in good standing as voluntary association with transferable shares of beneficial interest commonly known as a “Massachusetts business trust,� under the laws of the Commonwealth of Massachusetts, with full right and power to effect the 2023 Transition of the AMTP Shares and to execute, deliver and perform its obligations under this Agreement and each Related Document.

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The execution, delivery and performance by the Fund of this Agreement and each Related Document are within the Fund’s powers, have been duly authorized by all necessary action, require no action by or in respect of, or filing with, any governmental body, agency or official except such as have been taken or made and do not violate or contravene, or constitute a default under, any provision of applicable law, charter, ordinance or regulation or of any material agreement, judgment, injunction, order, decree or other instrument binding upon the Fund or result in the creation or imposition of any lien or encumbrance on any asset of the Fund.

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This Agreement constitutes a valid and binding agreement of the Fund, enforceable in accordance with its terms except as (i)Ìýthe enforceability thereof may be limited by bankruptcy, insolvency or similar laws affecting creditorsâ€� rights generally and (ii)Ìýthe availability of equitable remedies may be limited by equitable or public policy principles of general applicability, it being understood that the enforceability of indemnification provisions may be subject to limitations imposed under applicable securities laws. The AMTP Shares have been duly authorized and validly issued by the Fund and are fully paid and nonassessable, except that, as described in the Offering Memorandum, shareholders of a Massachusetts business trust may under certain circumstances be held liable for its obligations, and are free of any pre-emptive or similar rights.

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The financial statements of the Fund as of its most recent fiscal year-end, and the auditors� report with respect thereto, copies of which have heretofore been furnished to ▇▇▇▇� Fargo, fairly present in all material respects the financial condition of the Fund, at such date and for such period, and were prepared in accordance with accounting principles generally accepted in the United States, consistently applied (except as required or permitted and disclosed). Since the most recent fiscal year-end of the Fund, there has been no material adverse change in the condition (financial or otherwise) or operations of the Fund, except as disclosed in the Offering Memorandum, other than changes in the general economy or changes affecting the market for municipal securities or investment companies generally. Any financial, budget and other projections furnished to ▇▇▇▇� Fargo were prepared in good faith on the basis of the assumptions stated therein, which assumptions were fair and reasonable in light of conditions existing at the time of delivery of such financial, budget or other projections, and represented, and as of the date of this representation, represent, the Fund’s reasonable best estimate of the Fund’s future financial performance.

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Except as disclosed in the Offering Memorandum or in a schedule delivered to ▇▇▇▇â–� Fargo prior to the Effective Date, no action, suit, proceeding or investigation is pending or (to the best knowledge of the Fund) overtly threatened in writing against the Fund in any court or before any governmental authority (i)Ìýin any way contesting or, if decided adversely, would affect the validity of any Related Document or this Agreement; or (ii)Ìýin which a final adverse decision would materially adversely affect provisions for or materially adversely affect the sources for payment of Liquidation Preference of or dividends on the AMTP Shares.

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All consents, licenses, approvals, validations and authorizations of, and registrations, validations or declarations by or with, any court or any governmental agency, bureau or agency required to be obtained in connection with the execution, delivery, performance, validity or enforceability of this Agreement and the other Related Documents (including the AMTP Shares) by or against the Fund have been obtained and are in full force and effect.

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All information, reports and other papers and data with respect to the Fund furnished to ▇▇▇▇â–� Fargo (other than financial information and financial statements, which are covered solely by SectionÌý4.4 of this Agreement) were, at the time the same were so furnished, complete and correct in all material respects. No fact is known to the Fund that materially and adversely affects or in the future may (so far as it can reasonably foresee) materially and adversely affect the AMTP Shares, or the Fund’s ability to repay when due its obligations under this Agreement, any of the AMTP Shares and the Related Documents that has not been set forth in the Offering Memorandum or in the financial information and

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other documents referred to in SectionÌý4.4 or this SectionÌý4.7 or in such information, reports, papers and data or otherwise made available or disclosed in writing to ▇▇▇▇â–� Fargo. Taken as a whole, the documents furnished and statements made by the Fund in connection with the negotiation, preparation or execution of this Agreement and the Related Documents do not contain untrue statements of material facts or omit to state material facts necessary to make the statements contained therein, in light of the circumstances under which they were made, not misleading.

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The Offering Memorandum, true copies of which have heretofore been delivered to ▇▇▇▇� Fargo, when considered together with this Agreement and any information made available pursuant to the Due Diligence Request or disclosed in writing to ▇▇▇▇� Fargo prior to the Effective Date in connection with this Agreement, does not contain any untrue statement of a material fact and such Offering Memorandum does not omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading.

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The Fund is duly registered as a closed-end management investment company under the 1940 Act and such registration is in full force and effect.

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As of the Effective Date, the Fund is in compliance with the Effective Leverage Ratio and the Asset Coverage as required by SectionÌý2.4 of the Statement.

In connection with calculating the Effective Leverage Ratio, the Fund’s total assets and accrued liabilities reflect the positive or negative net obligations of the Fund under each Derivative Contract determined in accordance with the Fund’s valuation policies.

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As of the Effective Date, the Fund owns only Eligible Assets, as described in EXHIBIT B to this Agreement.

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As of the Effective Date, the Fund has invested (1)Ìýup to 75% of its Managed Assets in municipal securities rated, at the time of investment, Baa/BBB or lower by at least one nationally recognized statistical rating organization (S&P, ▇▇▇▇▇’▇ and Fitch) including below-investment grade securities, or unrated securities judged by the Sub-Adviser to be of comparable quality; and (2)Ìýno more than 10% of its Managed Assets in municipal securities rated at the time of investment B3/B- and below or judged by the Sub-Adviser to be of comparable quality.

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The Fund understands that nothing in this Agreement, the Offering Memorandum, or any other materials presented to the Fund in connection with the 2023 Transition of the AMTP Shares constitutes legal, tax or investment advice from ▇▇▇▇� Fargo. The Fund has consulted such legal, tax and investment advisors as it, in its sole discretion, has deemed necessary or appropriate in connection with the 2023 Transition of the AMTP Shares.

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The Fund acknowledges that, other than the fees and expenses payable pursuant to this Agreement, no brokerage or finder’s fees or commissions are or will be payable by the Fund or, to the Fund’s knowledge, by ▇▇▇▇� Fargo to any broker, financial advisor or consultant, finder, placement agent, investment banker, bank or other Person with respect to the transactions contemplated by this Agreement. The Fund is paying no fee or other consideration to ▇▇▇▇� Fargo in connection with the transactions contemplated by this Agreement.

ARTICLE V

REPRESENTATIONS AND WARRANTIES OF ▇▇▇▇� FARGO

The representations and warranties set out in this Article V are given hereunder by Wells Fargo to the Fund as of the Effective Date:

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▇▇▇▇� Fargo is validly existing and in good standing as a limited liability company under the laws of the state of Delaware, and ▇▇▇▇� Fargo has full right and power to acquire the AMTP Shares in connection with the 2023 Transition and to execute, deliver and perform its obligations under this Agreement and each Related Document to which it is a party.

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The execution, delivery and performance by ▇▇▇▇� Fargo of this Agreement and each Related Document to which it is a party are within ▇▇▇▇� Fargo’s powers, have been duly authorized by all necessary action, require no action by or in respect of, or filing with, any governmental body, agency or official except such as have been taken or made, and do not violate or contravene, or constitute a default under, any provision of applicable law, charter, ordinance or regulation or of any material agreement, judgment, injunction, order, decree or other instrument binding upon ▇▇▇▇� Fargo.

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This Agreement constitutes a valid and binding agreement of ▇▇▇▇â–� Fargo, enforceable in accordance with its terms except as (i)Ìýthe enforceability thereof may be limited by bankruptcy, insolvency or similar laws affecting creditorsâ€� rights generally and (ii)Ìýthe availability of equitable remedies may be limited by equitable or public policy principles of general applicability, it being understood that the enforceability of indemnification provisions may be subject to limitations imposed under applicable securities laws.

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▇▇▇▇� Fargo understands that the AMTP Shares are “restricted securities� and have not been registered under the Securities Act or any applicable state securities laws and ▇▇▇▇� Fargo (subject to the case of any transfer of the AMTP Shares to an Eligible Repurchase Agreement Counterparty) is acquiring the AMTP Shares as principal for its own account and not with a view to or for the purpose of distributing or reselling such securities or any part thereof in violation of the Securities Act or any applicable state securities law, has no present intention of distributing any of such AMTP Shares in violation of the Securities Act or any applicable state securities law and has no direct or indirect arrangement or understandings with any other persons to distribute or regarding the distribution of such AMTP Shares in violation of the Securities Act or any applicable state securities law (this representation and warranty not limiting ▇▇▇▇� Fargo’s right to transfer the AMTP Shares in compliance with the transfer limitations of this Agreement in compliance with applicable federal and state securities laws).

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Except as disclosed in a schedule delivered to the Fund prior to the Effective Date, no action, suit, proceeding or investigation is pending or (to the best knowledge of ▇▇▇▇� Fargo) overtly threatened in writing against ▇▇▇▇� Fargo in any court or before any governmental authority in any way contesting or, if decided adversely, would affect the validity of this Agreement.

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All consents, licenses, approvals, validations and authorizations of, and registrations, validations or declarations by or with, any court or any governmental agency, bureau or agency required to be obtained by ▇▇▇▇� Fargo in connection with the execution, delivery, performance, validity or enforceability of this Agreement by or against ▇▇▇▇� Fargo and the acquisition of the AMTP Shares in connection with the 2023 Transition have been obtained and are in full force and effect.

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As of the Effective Date, ▇▇▇▇â–� Fargo is either (i)Ìýan Accredited Investor or (ii)Ìýa QIB.

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▇▇▇▇� Fargo has such knowledge, sophistication and experience in business and financial matters so as to be capable of evaluating the merits and risks of the prospective investment in the AMTP Shares, and has so evaluated the merits and risks of such investment. ▇▇▇▇� Fargo is able to bear the economic risk of an investment in the AMTP Shares and, at the present time, is able to afford a complete loss of such investment.

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▇▇▇▇� Fargo acknowledges that it has had access to and has reviewed all information, documents and records that ▇▇▇▇� Fargo has deemed necessary in order to make an informed investment decision with respect to the 2023 Transition and an investment in the AMTP Shares. Wells Fargo has had the opportunity to ask representatives of the Fund certain questions and request certain additional information regarding the terms and conditions of the 2023 Transition and such investment and the finances, operations, business and prospects of the Fund and has had any and all such questions and requests answered to ▇▇▇▇� Fargo’s satisfaction; and ▇▇▇▇� Fargo understands the risk and other considerations relating to such investment.

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▇▇▇▇� Fargo acknowledges that it has sole responsibility for its own due diligence investigation and its own investment decision relating to the AMTP Shares. ▇▇▇▇� Fargo understands that nothing in this Agreement, the Offering Memorandum, or any other materials presented to ▇▇▇▇� Fargo in connection with the acquisition of the AMTP Shares in connection with the 2023 Transition constitutes legal, tax or investment advice from the Fund. ▇▇▇▇� Fargo has consulted such legal, tax and investment advisors as it, in its sole discretion, has deemed necessary or appropriate in connection with its investment in AMTP Shares.

Ìý

▇▇▇▇� Fargo acknowledges that, other than the fees and expenses payable pursuant to this Agreement, no brokerage or finder’s fees or commissions are or will be payable by ▇▇▇▇� Fargo to any broker, financial advisor or consultant, finder, placement agent, investment banker, bank or other Person with respect to the transactions contemplated by this Agreement. ▇▇▇▇� Fargo is paying no fee or other consideration to any Person in connection with the solicitation of the transactions contemplated by this Agreement.

ARTICLE VI

COVENANTS OF THE FUND

The Fund agrees that, so long as there is any amount payable hereunder or Wells Fargo owns any Outstanding AMTP Shares:

Ìý

Without limitation of the other provisions of this Agreement, the Fund will deliver, or direct the Redemption and Paying Agent to deliver, to ▇▇▇▇� Fargo:

Ìý

Ìý

15

Ìý

Ìý

Ìý

Ìý

Ìý

Ìý

Ìý

Ìý

Ìý

16

Ìý

Ìý

Ìý

Ìý

Ìý

Ìý

Ìý

17

All information, reports and other papers, documentation and data with respect to the Fund furnished to ▇▇▇▇â–� Fargo pursuant to this SectionÌý6.1 shall be, at the time the same are so furnished, complete and correct in all material respects and, when considered with all other material delivered to ▇▇▇▇â–� Fargo under this Agreement or made available pursuant to the Due Diligence Request, will not contain untrue statements of material facts or omit to state material facts necessary to make the statements contained therein, in light of the circumstances under which they were made, not misleading. For purposes of SectionsÌý6.1(o) and (p), references to any day that is not a Business Day shall mean the next preceding Business Day.

Ìý

To the extent that ▇▇▇▇� Fargo and their affiliates are the Holders or Designated Owners of at least 51% of the AMTP Shares, without the prior written consent of ▇▇▇▇� Fargo, the Fund will not agree to, consent to or permit any amendment, supplement, modification or repeal of the Statement, or any provision therein, nor waive any provision thereof.

Ìý

The Fund shall continue to maintain its existence as a business trust under the laws of The Commonwealth of Massachusetts, with full right and power to execute, deliver and perform its obligations under this Agreement and each Related Document.

Ìý

The Fund will qualify as a Regulated Investment Company within the meaning of SectionÌý851(a) of the Code and the dividends made with respect to the AMTP Shares will qualify as “exempt interest dividendsâ€� to the extent they are reported as such by the Fund and permitted by SectionÌý852(b)(5)(A) of the Code.

Ìý

The Fund shall promptly pay or cause to be paid all amounts payable by it hereunder and under the Related Documents, according to the terms hereof and thereof, shall take such actions as may be necessary to include all payments hereunder and thereunder which are subject to appropriation in its budget and make full appropriations related thereto, and shall duly perform each of its obligations under this Agreement and the Related Documents. All payments of any sums due hereunder shall be made in the amounts required hereunder without any reduction or setoff, notwithstanding the assertion of any right of recoupment or setoff or of any counterclaim by the Fund.

Ìý

The Fund shall comply with all laws, ordinances, orders, rules and regulations that may be applicable to it if the failure to comply could have a material adverse effect on the Fund’s ability to pay when due its obligations under this Agreement, any of the AMTP Shares, or any of the other Related Documents.

Ìý

18

The Fund shall at all times maintain in effect, renew and comply with all the terms and conditions of all consents, filings, licenses, approvals and authorizations as may be necessary under any applicable law or regulation for its execution, delivery and performance of this Agreement and the other Related Documents to which it is a party.

Ìý

The Fund shall, at any reasonable time and from time to time, upon reasonable notice, permit ▇▇▇▇� Fargo or any agents or representatives thereof, at the Fund’s expense, to examine and make copies of the records and books of account related to the transactions contemplated by this Agreement, to visit its properties and to discuss its affairs, finances and accounts with any of its officers and independent accountants, to the extent permitted by law, provided, however, that the Fund shall not be required to pay for more than one inspection per fiscal year. The Fund will not unreasonably withhold its authorization for its independent accountants to discuss its affairs, finances and accounts with Wells Fargo.

All information, reports and other papers, documentation and data with respect to the Fund furnished to ▇▇▇▇â–� Fargo pursuant to this SectionÌý6.8 shall be, at the time the same are so furnished, complete and correct in all material respects and, when considered with all other material delivered to ▇▇▇▇â–� Fargo under this Agreement made available pursuant to the Due Diligence Request, will not contain untrue statements of material facts or omit to state material facts necessary to make the statements contained therein, in light of the circumstances under which they were made, not misleading.

Ìý

The Fund shall give prompt notice in writing to ▇▇▇▇� Fargo of any litigation, administrative proceeding or business development which is reasonably expected to materially adversely affect its business, properties or affairs or to impair the ability of the Fund to perform its obligations as set forth hereunder or under any of the Related Documents.

All information, reports and other papers, documentation and data with respect to the Fund furnished to ▇▇▇▇â–� Fargo pursuant to this SectionÌý6.9 shall be, at the time the same are so furnished, complete and correct in all material respects and, when considered with all other material delivered to ▇▇▇▇â–� Fargo under this Agreement or made available pursuant to the Due Diligence Request, will not contain untrue statements of material facts or omit to state material facts necessary to make the statements contained therein, in light of the circumstances under which they were made, not misleading.

Ìý

The Fund shall maintain its valid registration as a registered closed-end company under the 1940 Act in full force and effect.

Ìý

19

The Fund shall only make investments in the Eligible Assets as described in EXHIBIT B, as amended from time to time with the prior written consent of ▇▇▇▇� Fargo, in accordance with the Fund’s investment objectives and the investment policies set forth in the Offering Memorandum as such investment objectives and investment policies may be modified in accordance with the 1940 Act and applicable law and, if applicable, the Related Documents.

Ìý

The Fund may invest (1)Ìýup to 75% of its Managed Assets in municipal securities rated, at the time of investment, Baa/BBB or lower by at least one nationally recognized statistical rating organization (S&P, ▇▇▇▇▇’▇ and Fitch) including below-investment grade securities, or unrated securities judged by the Sub-Adviser to be of comparable quality; and (2)Ìýno more than 10% of its Managed Assets in municipal securities rated at the time of investment B3/B- and below or judged by the Sub-Adviser to be of comparable quality.

Ìý

For so long as the Fund fails to provide the information required under SectionsÌý6.1(o) and 6.1(p), ▇▇▇▇â–� Fargo may calculate, for purposes of SectionÌý2.5(b)(ii)(A)(y) of the Statement, the Effective Leverage Ratio using the most recently received information required to be delivered pursuant to SectionsÌý6.1(o) and 6.1(p) and the market values of securities determined by the third-party pricing service which provided the market values to the Fund on the most recent date that information was properly provided by the Fund pursuant to the requirements of SectionsÌý6.1(o) and 6.1(p). The Effective Leverage Ratio as calculated by ▇▇▇▇â–� Fargo so long as ▇▇▇▇â–� Fargo holds AMTP Shares in such instances shall be binding on the Fund. If required, the Fund shall restore the Effective Leverage Ratio as provided in the Statement.

Ìý

The Fund shall use its commercially reasonable best efforts to engage at all times a Redemption and Paying Agent to perform the duties to be performed by the Redemption and Paying Agent specified herein and in the Statement.

Ìý

The Fund will comply with reasonable due diligence requests from ▇▇▇▇â–� Fargo in connection with any proposed sale by ▇▇▇▇â–� Fargo of the AMTP Shares in a transaction exempt from registration under the Securities Act and otherwise permitted by this Agreement, provided that the Fund need not comply with any such request more than twice in any period of twelve consecutive months and any prospective purchaser of the AMTP Shares from ▇▇▇▇â–� Fargo shall execute a confidentiality agreement substantially to the effect of SectionÌý8.13 hereof prior to receiving any due diligence materials provided pursuant to such due diligence request.

Ìý

20

All information, reports and other papers, documentation and data with respect to the Fund furnished to ▇▇▇▇â–� Fargo pursuant to this SectionÌý6.15 shall be, at the time the same are so furnished, complete and correct in all material respects and, when considered with all other material delivered to ▇▇▇▇â–� Fargo under this Agreement or made available pursuant to the Due Diligence Request, will not contain untrue statements of material facts or omit to state material facts necessary to make the statements contained therein, in light of the circumstances under which they were made, not misleading.

Ìý

In the event that the AMTP Shares are rated by a single Rating Agency and such Rating Agency withdraws the credit rating (the “Withdrawing Rating Agencyâ€�) required to be maintained with respect to the AMTP Shares pursuant to SectionÌý2.7 of the Statement due to the Withdrawing Rating Agency’s ceasing to rate tax-exempt closed-end management investment companies generally and such withdrawal is continuing:

Ìý

Ìý

Ìý

Ìý

The Fund agrees to maintain settlement of the AMTP Shares in global book entry form through the Securities Depository or such other clearance system acceptable to ▇▇▇▇� Fargo.

Ìý

The Fund shall promptly, at the request of ▇▇▇▇â–� Fargo, enter into an agreement, on terms mutually satisfactory to the Fund and ▇▇▇▇â–� Fargo, of the type specified in SectionÌý12(d)(1)(E)(iii) of the 1940 Act, so as to permit ▇▇▇▇â–� Fargo or any transferee satisfying the requirements set forth in SectionÌý2.1 to rely on the provisions of SectionÌý12(d)(1)(E)(iii) of the 1940 Act.

Ìý

21

Prior to the effectiveness of any Adjusted Dividend Amount or Adjusted Terms which shall be applicable to ▇▇▇▇â–� Fargo or any of its affiliates (including any tender option bond trust or other similar investment vehicle in which ▇▇▇▇â–� Fargo controls a majority of the residual or equity class), the Fund shall cause to be delivered to ▇▇▇▇â–� Fargo or any such affiliate, an opinion of counsel for the Fund, to the effect that, for U.S. federal income tax purposes, following such effectiveness (i)Ìýthe AMTP Shares will continue to qualify as equity in the Fund and (ii)Ìýthe distributions made with respect to the AMTP Shares will qualify as exempt-interest dividends to the extent they are reported as such by the Fund and are permitted by SectionÌý852(b)(5)(A) of the Code.

ARTICLE VII

COVENANTS OF ▇▇▇▇� FARGO

Ìý

▇▇▇▇â–� Fargo acknowledges that all of the AMTP Shares will be subject to Mandatory Tender in connection with a Third Party Purchase in connection with a Transition pursuant to Article 4 of the Statement and in accordance with SectionÌý2.2(h)(vii) and Article 3 of the Statement.

Ìý

▇▇▇▇â–� Fargo agrees that it shall not transfer any AMTP Shares except in compliance with SectionÌý2.1(b) hereof.

ARTICLE VIII

MISCELLANEOUS

Ìý

All notices, requests and other communications to any party hereunder shall be in writing (including telecopy, electronic mail or similar writing), except in the case of notices and other communications permitted to be given by telephone, and shall be given to such party at its address or telecopy number or email address set forth below or such other address or telecopy number or email address as such party may hereafter specify for the purpose by notice to the other parties. Each such notice, request or other communication shall be effective when delivered at the address specified in this Section; provided that notices to ▇▇▇▇â–� Fargo under SectionÌý6.1 shall not be effective until received in writing; except as otherwise specified, notices under SectionÌý6.1 may be given by telephone to ▇▇▇▇â–� Fargo at the telephone numbers listed below (or such other telephone numbers as may be designated by ▇▇▇▇â–� Fargo, by written notice to the Fund, to receive such notice), immediately confirmed in writing, including by fax or electronic mail. The notice address for each party is specified below:

Ìý

Nuveen Municipal High Income Opportunity Fund

▇▇� �. ▇▇▇▇▇▇ ▇▇▇▇�, ▇▇▇▇� ▇▇▇▇

Chicago, IL 60606

Attention: ▇▇▇▇ �. ▇▇▇▇▇▇, Vice President and Secretary

Telephone: (▇▇�) ▇▇�-▇▇▇▇

Email: ▇▇▇▇.▇▇▇▇▇▇@▇▇▇▇▇▇.▇▇�

Ìý

22

▇▇▇▇� Fargo Municipal Capital Strategies, LLC

c/o Wells Fargo Bank, National Association

30 ▇▇▇▇▇▇ Yards

▇▇� ▇▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇, 14th Floor

New York, NY 10001

Attention: ▇▇▇▇▇▇▇▇� ▇▇▇▇▇▇▇▇▇▇�

Telephone: (▇▇�) ▇▇�-▇▇▇▇

Facsimile: (▇▇�) ▇▇�-▇▇▇▇

Email: ▇▇▇▇▇▇▇▇�.▇▇▇▇▇▇▇▇▇▇▇@▇▇▇▇▇▇▇▇▇▇.▇▇�

Ìý

Ìý

Ìý

Ìý

Ìý

Ìý

23

Ìý

Ìý

24

Ìý

Each party further agrees that it will not, without the prior written consent of the other parties (the consent of a party shall not be required to the extent such party is neither requesting indemnification nor being requested to provide indemnification), settle or compromise or consent to the entry of any judgment in any pending or threatened claim, action, suit or proceeding in respect of which indemnification may be sought hereunder (whether or not any Indemnified Person is an actual or potential party to such claim, action, suit or proceeding) unless such settlement, compromise or consent includes an unconditional release of each other Indemnified Person from all liability and obligations arising therefrom. The Fund further agrees that none of ▇▇▇▇� Fargo, nor any of its affiliates, nor any directors, officers,

Ìý

25

partners, employees, agents, representatives or control persons of ▇▇▇▇� Fargo or any of its affiliates shall have any liability to the Fund arising out of or in connection with the proposed transactions giving rise to or contemplated by this Agreement except for such liability for losses, claims, damages, liabilities or expenses to the extent they have resulted from ▇▇▇▇� Fargo’s or its affiliates� gross negligence or willful misconduct. No Indemnified Person shall be responsible or liable to the indemnifying party or any other person for consequential, special or punitive damages which may be alleged as a result of this Agreement.

Ìý

Ìý

Any provision of this Agreement may be amended or waived if, but only if, such amendment or waiver is in writing and is signed by the Fund and ▇▇▇▇� Fargo; provided, that the Fund shall not make or agree to any amendment or waiver to the Declaration or the Statement that affects any preference, right or power of the AMTP Shares or the Holders or Designated Owners thereof except as permitted under the Declaration or the Statement.

Ìý

The provisions of this Agreement shall be binding upon and inure to the benefit of the parties hereto and their respective successors and assigns. Neither the Fund nor ▇▇▇▇â–� Fargo may assign or otherwise transfer any of its rights or obligations under this Agreement without the prior written consent of the other party (other than by operation of law), except that (1)Ìýany transferee satisfying the requirements set forth in SectionÌý2.1 and which has executed and delivered to the Fund the transferee certificate attached as EXHIBIT C shall, prior to registration of any AMTP Shares under the Securities Act, have the rights set forth in SectionÌý8.15 and shall, so long as such transferee has provided a means for the Fund to transmit such information electronically to it, be entitled to receive the information delivered pursuant to SectionsÌý6.1(o) and 6.1(p) and such transferees shall be deemed a party to this Agreement for purposes of SectionsÌý6.1(o), 6.1(p) and the confidentiality provisions herein as specified in the transferee certificate and (2)Ìý▇▇▇▇â–� Fargo may assign its rights or obligations to any affiliates of ▇▇▇▇â–� Fargo or any tender option bond trust or other similar investment vehicle in which ▇▇▇▇â–� Fargo or its affiliate retains the entire residual interest. Any assignment without such prior written consent shall be void.

Ìý

This Agreement shall terminate on the earlier of (x)Ìýthe registration of any Outstanding AMTP Shares under the Securities Act and (y)Ìýpayment in full of all amounts then due and owing to ▇▇▇▇â–� Fargo and its affiliates hereunder and under the AMTP Shares; and notwithstanding any termination of this Agreement, SectionÌý8.3, SectionÌý8.7, SectionÌý8.8, SectionÌý8.10, SectionÌý8.11, the second sentence of SectionÌý8.12, and SectionÌý8.13 (for a period of two years after the termination of this Agreement) shall remain in full force and effect.

Ìý

26

This Agreement shall be construed in accordance with and governed by the domestic law of the State of New York, except with respect to SectionÌý8.16, which shall be construed in accordance with and governed by the domestic law of the Commonwealth of Massachusetts.

THE PARTIES HERETO HEREBY SUBMIT TO THE NON-EXCLUSIVE JURISDICTION OF THE FEDERAL AND NEW YORK STATE COURTS LOCATED IN THE CITY OF NEW YORK IN CONNECTION WITH ANY DISPUTE RELATED TO THIS AGREEMENT OR ANY MATTERS CONTEMPLATED HEREBY.

Ìý

The Fund and ▇▇▇▇� Fargo hereby waive trial by jury in any action, proceeding or counterclaim brought by either of the parties hereto against any other on any matters whatsoever arising out of or in any way connected with this Agreement.

Ìý

This Agreement may be signed in counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument. Any counterpart or other signature delivered by facsimile or by electronic mail shall be deemed for all purposes as being a good and valid execution and delivery of this Agreement by that party.

Ìý

This Agreement is not intended and shall not be construed to confer upon any Person other than the parties hereto and their successors and permitted assigns any rights or remedies hereunder.

Ìý

Except as set forth in SectionÌý8.5, this Agreement shall constitute the entire agreement and understanding between the parties hereto with respect to the matters set forth herein and shall supersede any and all prior agreements and understandings relating to the subject matter hereof.

Ìý

The Fund and ▇▇▇▇â–� Fargo agree that the representations, warranties, covenants and agreements contained in this Agreement are in addition to the terms and provisions set forth in the Statement. As between the Fund and ▇▇▇▇â–� Fargo, the Fund and ▇▇▇▇â–� Fargo agree that SectionÌý2.10(d) of the Statement shall have no effect for so long as none of the AMTP Shares have been registered under the Securities Act.

Ìý

27

Any information delivered by a party to this Agreement to any other party pursuant to this Agreement, including, without limitation, pursuant to SectionÌý6.1 in the case of the Fund (collectively, the â€�Informationâ€�), shall not be disclosed by such other party (or its employees, representatives or agents) to any person or entity (except as required by law or to such of its agents and advisors as need to know and agree to be bound by the provisions of this paragraph) without the prior written consent of the party delivering the Information.

The obligations of confidentiality set out in the preceding paragraph do not extend to Information that is or becomes available to the public or is or becomes available to the party receiving the Information on a non-confidential basis or is disclosed to Holders or Designated Owners or potential Holders or Designated Owners, in each case in their capacity as such, in the offering documents of the Fund, in notices to Holders or Designated Owners pursuant to one or more of the Related Documents or pursuant to the Fund’s or ▇▇▇▇â–� Fargo’s informational obligations under Rule 144A(d)(4) or other reporting obligation of the Securities and Exchange Commission, or is required or requested to be disclosed (i)Ìýby a regulatory agency or in connection with an examination of either party or its representatives by regulatory authorities, (ii)Ìýpursuant to subpoena or other court process, (iii)Ìýat the express direction of any other authorized government agency, (iv)Ìýto its independent attorneys or auditors, (v)Ìýas required by any NRSRO, (vi)Ìýas otherwise required by law or regulation, (vii)Ìýotherwise in connection with the enforcement of this Agreement, (viii)Ìýin connection with the exercise of any remedies hereunder or in any suit, action or proceeding relating to this Agreement and the enforcement of rights hereunder, (ix)Ìýsubject to an agreement containing provisions substantially similar to those of this SectionÌý8.13, (x)Ìýto a prospective investor in a tender option bond trust (or similar investment vehicle or arrangement) financing as permitted by SectionÌý2.1(b) of this Agreement that is aware of the confidentiality provisions of this SectionÌý8.13, (a) to the extent that the Information consists solely of copies of the Related Documents and (b)Ìýotherwise subject to an agreement with the transferor containing provisions substantially similar thereto and that states that the Fund is an express third party beneficiary thereof, (xi)Ìýto Eligible Repurchase Agreement Counterparties, (xii)Ìýby a prospective purchaser of the AMTP Shares that is (a)Ìýa transferee that would be permitted pursuant to SectionÌý2.1(b) of this Agreement and (b)Ìýaware of the confidentiality provisions of this SectionÌý8.13 and is subject to an agreement with the transferor containing provisions substantially similar thereto and that states that the Fund is an express third party beneficiary thereof, and (xiii)Ìýsubject to an agreement containing provisions substantially similar to those of this SectionÌý8.13 and with the prior written consent of the other party to this Agreement, which consent shall not be unreasonably withheld, to any actual or prospective counterparty in any swap or derivative transactions. For the avoidance of doubt, references in this SectionÌý8.13 to “regulatory agency,â€� “regulatory authorities,â€� “government agencyâ€� and “law or regulationâ€� shall be deemed to include the Internal Revenue Service, state taxation authorities and tax laws and regulations, as appropriate.

Ìý

28

In case any provision of this Agreement shall be invalid, illegal, or unenforceable, the validity, legality, and enforceability of the remaining provisions shall not in any way be affected or impaired thereby so long as the intent of the parties to this Agreement shall be preserved.

Ìý

For so long as none of the AMTP Shares have been registered under the Securities Act, without the affirmative vote or consent of the Majority Participants, neither the Fund nor the Board of Trustees will take or authorize the taking of any of actions set forth under clausesÌý(a) through (e)Ìýof this SectionÌý8.15:

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29

Ìý

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In addition, if the Board of Trustees shall designate a replacement to the S&P Municipal Bond 7 Day High Grade Rate Index pursuant to the definition of SIFMA Municipal Swap Index contained in the Statement, the Fund shall notify the Holders of the AMTP Shares within five (5)ÌýBusiness Days of such designation, and if within thirty (30)Ìýdays of such notice the Majority Participants shall have objected in writing to the designated replacement, the Board of Trustees shall designate a replacement to such index as agreed to between the Fund and the Majority Participants. In such event, the replacement index initially approved by the Board of Trustees shall be the index in effect for purposes of the Statement until a new index has been approved by the Fund and the Majority Participants.

Ìý

A copy of the Declaration of Trust of the Fund is on file with the Secretary of the Commonwealth of Massachusetts, and notice hereby is given that this Agreement is executed on behalf of the Fund by an officer of the Fund in his or her capacity as an officer of the Fund and not individually and that the obligations of the Fund under or arising out of this Agreement are not binding upon any of the trustees, officers or shareholders individually but are binding only upon the assets and properties of the Fund.

[The remainder of this page has been intentionally left blank.]

Ìý

30

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly executed by their respective authorized officers as of the day and year first above written.

Ìý

[NMZ � AMTP Transition Agreement]

SCHEDULE 1

Ìý

Schedule 1

EXHIBIT A

FORMS OF OPINIONS OF COUNSEL FOR THE FUND

Ìý

A-1

EXHIBIT A-1

FORM OF CORPORATE AND 1940 ACT OPINION

[ON FILE]

Ìý

A-1-1

EXHIBIT A-2

FORM OF TAX OPINION

[ON FILE]

Ìý

A-2-1

EXHIBIT A-3

FORM OF LOCAL COUNSEL OPINION

[ON FILE]

Ìý

A-3-1

EXHIBIT B

ELIGIBLE ASSETS

On the Effective Date and at all times thereafter that the Agreement is effective:

Ìý

Ìý

i. “Municipal securities,� defined as obligations (whether documented as securities or as loans) of a State, the District of Columbia, a U.S. territory, or a political subdivision thereof, and including general obligations, limited obligation bonds, revenue bonds, and obligations that satisfy the requirements of section 142(b)(1) of the Internal Revenue Code of 1986 issued by or on behalf of any State, the District of Columbia, any U.S. territory or any political subdivision thereof, including any municipal corporate instrumentality of 1 or more States, or any public agency or authority of any State, the District of Columbia, any U.S. territory or any political subdivision thereof, including obligations of any of the foregoing types related to financing a 501(c)(3) organization. The purchase of any municipal security will be based upon the Investment Adviser’s assessment of an asset’s relative value in terms of current yield, price, credit quality, and future prospects; and the Investment Adviser will monitor the creditworthiness of the Fund’s portfolio investments and analyze economic, political and demographic trends affecting the markets for such assets. Eligible Assets shall include any municipal securities that at the time of purchase are paying scheduled principal and interest or if at the time of purchase are in payment default, then in the sole judgment of the Investment Adviser are expected to produce payments of principal and interest whose present value exceeds the purchase price.

ii. Debt obligations of the United States.

iii. Debt obligations issued, insured, or guaranteed by a department or an agency of the U.S. Government, if the obligation, insurance, or guarantee commits the full faith and credit of the United States for the repayment of the obligation.

iv. Debt obligations of the Washington Metropolitan Area Transit Authority guaranteed by the Secretary of Transportation under SectionÌý9 of the National Capital Transportation Act of 1969.

v. Debt obligations of the Federal Home Loan Banks.

vi. Debt obligations, participations or other instruments of or issued by the Federal National Mortgage Association or the Government National Mortgage Association.

Ìý

B-1

vii. Debt obligations which are or ever have been sold by the Federal Home Loan Mortgage Corporation pursuant to sections 305 or 306 of the Federal Home Loan Mortgage Corporation Act.

viii. Debt obligations of any agency named in 12 U.S.C. § 24(Seventh) as eligible to issue obligations that a national bank may underwrite, deal in, purchase and sell for the bank’s own account, including qualified Canadian government obligations.

ix. Debt obligations of issuers other than those specified in (i)Ìýthrough (viii) above that are “investment gradeâ€� and that are “marketable.â€� For these purposes, an obligation is:

Ìý

Ìý

Ìý

Ìý

Ìý

Ìý

x. Certificates or other securities evidencing ownership interests in a municipal bond trust structure (generally referred to as a tender option bond structure) that invests in (a)Ìýdebt obligations of the types described in (i)Ìýabove or (b)Ìýdepository receipts reflecting ownership interests in accounts holding debt obligations of the types described in (i)Ìýabove.

The bonds, notes and other debt securities referenced in (A)Ìýabove shall be defined as Eligible Assets. An asset shall not lose its status as an Eligible Asset solely by virtue of the fact that:

Ìý

Ìý

Ìý

Ìý

Ìý

B-2

Ìý

Ìý

Ìý

Ìý

Ìý

Ìý

Ìý

Ìý

Ìý

Ìý

B-3

EXHIBIT C

TRANSFEREE CERTIFICATE

Nuveen Municipal High Income Opportunity Fund

▇▇� �. ▇▇▇▇▇▇ ▇▇▇▇�, ▇▇▇▇� ▇▇▇▇

Chicago, Illinois 60606

Attention: ▇▇▇▇ �. ▇▇▇▇▇▇

Vice PresidentÌý& Secretary

Ladies and Gentlemen:

Reference is hereby made to the AMTP Shares Transition Agreement (the “Transition Agreementâ€�), dated as of ____________ __, 2023, between Nuveen Municipal High Income Opportunity Fund, a closed-end fund organized as a Massachusetts business trust (the “F³Ü²Ô»åâ€�) and ▇▇▇▇â–� Fargo Municipal Capital Strategies, LLC, a Delaware limited liability company, including its successors by merger or operation (the “Transferorâ€� or “▇▇▇▇▇ Fargoâ€�). Capitalized terms used but not defined herein shall have the meanings given them in the Transition Agreement.

In connection with the proposed sale by the Transferor of _______________AMTP Shares (the “Transferred Shares�) to the undersigned transferee (the “Transferee�), the undersigned agrees and acknowledges, on its own behalf, and makes the representations and warranties, on its own behalf, as set forth in this certificate (this “Transferee Certificate�) to the Fund and the Transferor:

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â˜� is a “qualified institutional buyerâ€� (a ‾»±õµþâ€�) (as defined in Rule 144A under the Securities Act or any successor provision) (“Rule 144Aâ€�) that is a registered closed-end management investment company the shares of which are traded on a national securities exchange (a “C±ô´Ç²õ±ð»å-·¡²Ô»å Fundâ€�), a bank or an entity that is a 100% direct or indirect subsidiary of a bank’s publicly traded holding company (a “Bankâ€�), insurance company or registered open-end management investment company, in each case, to which any offer and sale is being made pursuant to Rule 144A or another available exemption from registration under the U.S. Securities Act of 1933, as amended (the “Securities Actâ€�), in a manner not involving any public offering within the meaning of SectionÌý4(a)(2) of the Securities Act;

â˜� is (i)Ìýa tender option bond trust or other similar investment vehicle in which all investors are QIBs that are Closed-End Funds, Banks, insurance companies, or registered open-end management investment companies, (ii)Ìýan Eligible Repurchase Agreement Counterparty, or (iii)Ìýa ▇▇▇▇â–� Fargo affiliate who is either a QIB or Accredited Investor; or

� is a person which the Fund has consented in writing to permit to be the holder of the Transferred Shares.

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� is not a Nuveen Person that after such sale and transfer, would own more than 20% of the Outstanding AMTP Shares; or

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� has received the prior written consent of the Fund and the holder(s) of more than 50% of the outstanding AMTP Shares.

3. The Transferee understands and acknowledges that the Transferred Shares are “restricted securitiesâ€� and have not been registered under the Securities Act or any other applicable securities law, are being offered for sale pursuant to Rule 144A of the Securities Act or another available exemption from registration under the Securities Act, in a manner not involving any public offering with the meaning of SectionÌý4(a)(2) of the Securities Act, and may not be offered, sold or otherwise transferred except in compliance with the registration requirements of the Securities Act or any other applicable securities law, pursuant to an exemption therefrom or in a transaction not subject thereto and in each case in compliance with the conditions for transfer set forth in this Transferee Certificate.

4. The Transferee is purchasing the Transferred Shares for its own account for investment, and not with a view to, or for offer or sale in connection with, any distribution thereof in violation of the Securities Act, subject to any requirements of law that the disposition of its property be at all times within its or their control and subject to its or their ability to resell such securities pursuant to Rule 144A or any exemption from registration available under the Securities Act.

5. The Transferee agrees on its own behalf and on behalf of each subsequent holder or owner of the Transferred Shares by its acceptance thereof will be required to sell, transfer or otherwise dispose of such Transferred Shares only in whole shares and only to Persons that are both: (1)(i) Persons such Transferee reasonably believes are QIBs that are Closed-End Funds, Banks, insurance companies or registered open-end management investment companies, in each case, pursuant to Rule 144A or another available exemption from registration under the Securities Act, (ii)Ìýtender option bond trusts or other similar investment vehicles in which all investors are Persons such Transferee reasonably believes are QIBs that are Closed-End Funds, Banks, insurance companies, or registered open-end management investment companies, (iii)ÌýEligible Repurchase Agreement Counterparties, provided that the Transferee retains the voting rights (subject to any voting trust agreement and except in the case of an event of default under the related repurchase agreement) with respect to any AMTP Shares being transferred to an Eligible Repurchase Agreement Counterparty, (iv)Ìý▇▇▇▇â–� Fargo affiliates who are either QIBs or Accredited Investors, or (v)Ìýother investors which the Fund has consented in writing to permit to be a holder of the Transferred Shares and (2)ÌýPersons that are either (i)Ìýnot a Nuveen Person or (ii)Ìýa Nuveen Person, provided that (x)Ìýsuch Nuveen Person would, after such sale and transfer, own not more than 20% of the Outstanding AMTP Shares, or (y)Ìýthe prior written consent of the Fund and the Majority Participants has been obtained.

6. The Transferee acknowledges that the AMTP Shares were issued in book-entry form and are represented by one global certificate and that the global certificate representing the AMTP Shares (unless sold to the public in an underwritten offering of the AMTP Shares pursuant to a registration statement filed under the Securities Act) contains a legend substantially to the following effect:

THE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT, OR ANY STATE SECURITIES LAW. NEITHER THIS SECURITY NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, REGISTRATION.

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THE HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF AGREES TO SELL, TRANSFER OR OTHERWISE DISPOSE OF SUCH SECURITY ONLY IN WHOLE SHARES AND ONLY TO PERSONS THAT ARE BOTH (1)(A) PERSONS THAT THE HOLDER REASONABLY BELIEVES ARE “QUALIFIED INSTITUTIONAL BUYERSâ€� THAT ARE CLOSED-END FUNDS, BANKS, INSURANCE COMPANIES OR REGISTERED OPEN-END MANAGEMENT INVESTMENT COMPANIES, IN EACH CASE, IN AN OFFER AND SALE MADE PURSUANT TO RULE 144A OR ANOTHER AVAILABLE EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT, IN A MANNER NOT INVOLVING ANY PUBLIC OFFERING WITHIN THE MEANING OF SECTION 4(a)(2) OF THE SECURITIES ACT; (B)ÌýTENDER OPTION BOND TRUSTS OR OTHER SIMILAR INVESTMENT VEHICLES IN WHICH ALL INVESTORS ARE PERSONS THE HOLDER REASONABLY BELIEVES ARE QUALIFIED INSTITUTIONAL BUYERS THAT ARE CLOSED-END FUNDS, BANKS, INSURANCE COMPANIES, OR REGISTERED OPEN-END MANAGEMENT INVESTMENT COMPANIES; (C)ÌýELIGIBLE REPURCHASE AGREEMENT COUNTERPARTIES, PROVIDED THAT THE HOLDER RETAINS THE VOTING RIGHTS (SUBJECT TO ANY VOTING TRUST AGREEMENT AND EXCEPT IN THE CASE OF AN EVENT OF DEFAULT UNDER THE RELATED REPURCHASE AGREEMENT) WITH RESPECT TO ANY AMTP SHARES BEING TRANSFERRED TO AN ELIGIBLE REPURCHASE AGREEMENT COUNTERPARTY; (D)Ìý▇▇▇▇â–� FARGO AFFILIATES WHO ARE EITHER QIBS OR ACCREDITED INVESTORS; OR (E)ÌýPERSONS THAT THE ISSUER OF THE SECURITY HAS APPROVED IN WRITING TO BE A HOLDER OF THE SECURITY AND (2)ÌýPERSONS THAT ARE EITHER (I)ÌýNOT A NUVEEN PERSON OR (II)ÌýA NUVEEN PERSON, PROVIDED THAT (X)ÌýSUCH NUVEEN PERSON WOULD, AFTER SUCH SALE AND TRANSFER, OWN NOT MORE THAN 20% OF THE OUTSTANDING AMTP SHARES, OR (Y)ÌýTHE PRIOR WRITTEN CONSENT OF THE FUND AND THE HOLDER(S) OF MORE THAN 50% OF THE OUTSTANDING AMTP SHARES HAS BEEN OBTAINED.

THE HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF SHALL BE DEEMED TO HAVE AGREED THAT, IN CONNECTION WITH ANY TRANSFER OF AMTP SHARES, IT IS TRANSFERRING TO THE TRANSFEREE THE RIGHT TO RECEIVE FROM THE FUND ANY DIVIDENDS DECLARED AND UNPAID FOR EACH DAY PRIOR TO THE TRANSFEREE BECOMING THE BENEFICIAL OWNER OF THE AMTP SHARES IN EXCHANGE FOR PAYMENT OF THE PURCHASE PRICE FOR SUCH AMTP SHARES BY THE TRANSFEREE.

7. The Transferee has such knowledge, sophistication and experience in business and financial matters so as to be capable of evaluating the merits and risks of the prospective investment in the Transferred Shares, and has so evaluated the merits and risks of such investment. The Transferee is able to bear the economic risk of an investment in the Transferred Shares and, at the present time, is able to afford a complete loss of such investment.

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8. Other than consummating the purchase of the Transferred Shares, the Transferee has not directly or indirectly, nor has any person acting on behalf of or pursuant to any understanding with the Transferee, executed any other purchases of securities of the Fund which may be integrated with the proposed purchase of the Transferred Shares by the Transferee.

9. The Transferee acknowledges that it has received a copy of the Transition Agreement and Appendices thereto and agrees to abide by any obligations therein binding on a transferee of the AMTP Shares and the confidentiality obligations therein with respect to information relating to the Fund as if it were the Transferor.

10. The Transferee acknowledges that it has been given the opportunity to obtain from the Fund the information referred to in Rule 144A(d)(4) under the Securities Act, and has either declined such opportunity or has received such information and has had access to and has reviewed all information, documents and records that it has deemed necessary in order to make an informed investment decision with respect to an investment in the Transferred Shares and that the Transferee understands the risk and other considerations relating to such investment.

11. The Transferee acknowledges that it has sole responsibility for its own due diligence investigation and its own investment decision relating to the Transferred Shares. The Transferee understands that any materials presented to the Transferee in connection with the purchase and sale of the Transferred Shares does not constitute legal, tax or investment advice from the Fund. The Transferee has consulted such legal, tax and investment advisors as it, in its sole discretion, has deemed necessary or appropriate in connection with the purchase of the Transferred Shares.

12. The Transferee acknowledges that each of Transferor and the Fund and their respective affiliates and others will rely on the acknowledgments, representations and warranties contained in this Transferee’s Certificate as a basis for exemption of the sale of the Transferred Shares under the Securities Act, under the securities laws of all applicable states, and for other purposes. The Transferee agrees to promptly notify the Fund and the Transferor if any of the acknowledgments, representations or warranties set forth herein are no longer accurate. If the Transferee is acquiring any securities as a fiduciary or agent for one or more investor accounts, it represents that it has sole investment discretion with respect to each such account and that it has full power to make the foregoing acknowledgments, representations and agreements on behalf of each such account.

13. This Transferee’s Certificate shall be governed by and construed in accordance with the laws of the State of New York.

14. The Transferee agrees to provide, together with this completed and signed Transferee’s Certificate, a completed and signed IRS Form W-9, Form W-8 or successor form, as applicable.

[Signature Page Follows.]

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The undersigned has provided a completed and signed IRS Form W-9, Form W-8 or successor form, as applicable, and has caused this Transferee’s Certificate to be executed by its duly authorized representative as of the date set forth below.

Date: ______________________

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EXHIBIT D

INFORMATION TO BE PROVIDED BY THE FUND

Reporting as of:____________

TOB Floaters: $____________

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