T. Rowe Price Institutional Income Funds, Inc. 485BPOS

Exhibit 99.(h)(14)

RULE 12d1-4

FUND OF FUNDS INVESTMENT AGREEMENT

THIS AGREEMENT, dated as of January 19, 2022 between each Acquiring Fund, severally and not jointly, (each, an “Acquiring Fund”), and each Acquired Fund, severally and not jointly, (each, an “Acquired Fund” and together with the Acquiring Fund(s), the “Funds”), listed on Schedule A.

WHEREAS, each Fund is registered with the U.S. Securities and Exchange Commission (“SEC”) as an investment company under the Investment Company Act of 1940, as amended, (the “1940 Act”);

WHEREAS, Section 12(d)(1)(A) of the 1940 Act limits the extent to which a registered investment company may invest in shares of other registered investment companies, Section 12(d)(1)(B) limits the extent to which a registered investment company, its principal underwriter or registered brokers or dealers may knowingly sell shares of such registered investment company to other investment companies, and Section 12(d)(1)(C) limits the extent to which an investment company may invest in the shares of a registered closed-end investment company;

WHEREAS, Rule 12d1-4 under the 1940 Act (the “Rule”) permits registered investment companies, such as the Acquiring Funds, to invest in shares of other registered investment companies, such as the Acquired Funds, in excess of the limits of Section 12(d)(1) of the 1940 Act subject to compliance with the conditions of the Rule; and

WHEREAS, an Acquiring Fund may, from time to time, invest in shares of one or more Acquired Funds in excess of the limitations of Section 12(d)(1)(A) in reliance on the Rule;

NOW THEREFORE, in accordance with the Rule, the Acquiring Fund(s) and the Acquired Fund(s) desire to set forth the following terms pursuant to which the Acquiring Fund(s) may invest in the Acquired Fund(s) in reliance on the Rule.

(a) In order to help reasonably address the risk of undue influence on an Acquired Fund by an Acquiring Fund, and to assist the Acquired Fund’s investment adviser with making the required findings under the Rule, each Acquiring Fund and each Acquired Fund agree as follows:

(i) In-kind redemptions. The Acquiring Fund acknowledges and agrees that, if and to the extent consistent with the Acquired Fund’s registration statement, as amended from time to time, the Acquired Fund may honor any redemption request partially or wholly in-kind.

(ii) Timing/advance notice of redemptions. The Acquiring Fund will use reasonable efforts to spread large redemption requests (greater than 3% of the Acquired Fund’s total outstanding shares) over multiple days or to provide advance notification of redemption requests to the Acquired Fund(s) whenever practicable and consistent with the Acquiring Fund’s best interests. The Acquired Fund acknowledges and agrees that any notification provided pursuant to the foregoing is not a commitment to redeem and constitutes an estimate that may differ materially from the amount, timing and manner in which a redemption request is submitted, if any.

(iii) Scale of investment. Upon a reasonable request by an Acquired Fund, the Acquiring Fund will provide summary information regarding the anticipated timeline of its investment in the Acquired Fund and the scale of its contemplated investments in the Acquired Fund.

(b) In order to assist the Acquiring Fund’s investment adviser with evaluating the complexity of the structure and fees and expenses associated with an investment in an Acquired Fund, each Acquired Fund shall provide each Acquiring Fund with information on the fees and expenses of the Acquired Fund reasonably requested by the Acquiring Fund with reference to the Rule.

In connection with any investment by an Acquiring Fund in an Acquired Fund in excess of the limitations in Section 12(d)(1)(A), the Acquired Fund agrees to: (i) comply with all conditions of the Rule, as interpreted or modified by the SEC or its Staff from time to time, applicable to Acquired Funds; (ii) comply with its obligations under this Agreement; and (iii) promptly notify the Acquiring Fund if such Acquired Fund fails to comply with the Rule with respect to an investment by the Acquiring Fund, as interpreted or modified by the SEC or its Staff from time to time, or this Agreement.

In connection with any investment by an Acquiring Fund in an Acquired Fund in excess of the limitations in Section 12(d)(1)(A), the Acquiring Fund agrees to: (i) comply with all conditions of the Rule, as interpreted or modified by the SEC or its Staff from time to time, applicable to Acquiring Funds; (ii) comply with its obligations under this Agreement; and (iii) promptly notify the Acquired Fund if such Acquiring Fund fails to comply with the Rule with respect to its investment in such Acquired Fund, as interpreted or modified by the SEC or its Staff from time to time, or this Agreement.

All notices, including all information that either party is required to provide under the terms of this Agreement and the Rule, shall be in writing and shall be delivered by registered or overnight mail, facsimile, or electronic mail to the address for each party specified below.

(a) This Agreement shall be effective for the duration of the Acquired Funds’ and the Acquiring Funds’ reliance on the Rule, as interpreted or modified by the SEC or its Staff from time to time. While the terms of the Agreement shall only be applicable to investments in Funds made in reliance on the Rule, as interpreted or modified by the SEC or its Staff from time to time, the Agreement shall continue in effect until terminated pursuant to Section 6(b).

(b) This Agreement shall continue until terminated in writing by either party upon 60 days’ notice to the other party. Upon termination of this Agreement, the Acquiring Fund may not purchase additional shares of the Acquired Fund beyond the Section 12(d)(1)(A) limits in reliance on the Rule.

In the case of each of the Acquiring Funds, a copy of the Declaration of Trust of the Acquiring Fund is on file with the Secretary of The Commonwealth of Massachusetts, and notice is hereby given that no trustee, officer, employee, agent, employee or shareholder of the Acquiring Funds shall have any personal liability under this Agreement, and that this Agreement is binding only upon the assets and property of the Acquiring Funds.

IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first written above.

T. Rowe Price International Funds, Inc.

T. Rowe Price Institutional Income Funds, Inc.

MassMutual Select Funds, on behalf of the Acquiring Funds listed on Schedule A to this Agreement, severally and not jointly

SCHEDULE A

List of Funds to Which the Agreement Applies

AMENDMENT No. 1 TO RULE 12d1-4

FUND OF FUNDS INVESTMENT AGREEMENT

THIS AMENDMENT, dated as of February 1, 2023 (the “Amendment”), to the Rule 12d1-4 Fund of Funds Investment Agreement, effective as of January 19, 2022 (the “Agreement”), is entered into between each Acquiring Fund, severally and not jointly, (each, an “Acquiring Fund”), and each Acquired Fund, severally and not jointly, (each, an “Acquired Fund” and together with the Acquiring Fund(s), the “Funds”), listed on Schedule A.

WHEREAS, an Acquiring Fund may, from time to time, invest in shares of one or more Acquired Funds in excess of the limitations of Section 12(d)(1) in reliance Rule 12d1-4 under the Investment Company Act of 1940, as amended (the “Rule”), subject to certain conditions of the Rule; and

WHEREAS, pursuant to Section 4(e) of the Agreement, the parties seek to amend Schedule A of the Agreement.

NOW, THERFORE, the parties hereby agree to amend the Agreement as follows:

IN WITNESS WHEREOF, the parties have executed this Amendment as of the date first written above.

T. Rowe Price International Funds, Inc.

T. Rowe Price Institutional Income Funds, Inc.

MassMutual Select Funds, on behalf of the Acquiring Funds listed on Schedule A to the Agreement, severally and not jointly

SCHEDULE A

List of Funds to Which the Agreement Applies

AMENDMENT No. 2 TO RULE 12d1-4

FUND OF FUNDS INVESTMENT AGREEMENT

THIS AMENDMENT, dated as of June 28, 2023 (the “Amendment”), to the Rule 12d1-4 Fund of Funds Investment Agreement, effective as of January 19, 2022, as amended (the “Agreement”), is entered into between each Acquiring Fund, severally and not jointly, (each, an “Acquiring Fund”), and each Acquired Fund, severally and not jointly, (each, an “Acquired Fund” and together with the Acquiring Fund(s), the “Funds”), listed on Schedule A.

WHEREAS, an Acquiring Fund may, from time to time, invest in shares of one or more Acquired Funds in excess of the limitations of Section 12(d)(1) in reliance Rule 12d1-4 under the Investment Company Act of 1940, as amended (the “Rule”), subject to certain conditions of the Rule; and

WHEREAS, pursuant to Section 4(e) of the Agreement, the parties seek to amend Schedule A of the Agreement.

NOW, THERFORE, the parties hereby agree to amend the Agreement as follows:

IN WITNESS WHEREOF, the parties have executed this Amendment as of the date first written above.

T. Rowe Price Equity Funds, Inc.

T. Rowe Price International Funds, Inc.

T. Rowe Price Institutional Income Funds, Inc.

MassMutual Select Funds, on behalf of the Acquiring Funds listed on Schedule A to the Agreement, severally and not jointly

SCHEDULE A

List of Funds to Which the Agreement Applies

AMENDMENT No. 3 TO RULE 12d1-4

FUND OF FUNDS INVESTMENT AGREEMENT

THIS AMENDMENT, dated as of May 1, 2024 (the “Amendment”), to the Rule 12d1-4 Fund of Funds Investment Agreement, effective as of January 19, 2022, as amended (the “Agreement”), is entered into between each Acquiring Fund, severally and not jointly, (each, an “Acquiring Fund”), and each Acquired Fund, severally and not jointly, (each, an “Acquired Fund” and together with the Acquiring Fund(s), the “Funds”), listed on Schedule A.

WHEREAS, an Acquiring Fund may, from time to time, invest in shares of one or more Acquired Funds in excess of the limitations of Section 12(d)(1) in reliance Rule 12d1-4 under the Investment Company Act of 1940, as amended (the “Rule”), subject to certain conditions of the Rule; and

WHEREAS, pursuant to Section 4(e) of the Agreement, the parties seek to amend Schedule A of the Agreement.

NOW, THERFORE, the parties hereby agree to amend the Agreement as follows:

IN WITNESS WHEREOF, the parties have executed this Amendment as of the date first written above.

T. Rowe Price Equity Funds, Inc.

T. Rowe Price International Funds, Inc.

T. Rowe Price Institutional Income Funds, Inc.

T. Rowe Price U.S. Treasury Long-Term Index Funds, Inc.

T. Rowe Price Limited Duration Inflation Focused Bond, Inc.

MassMutual Select Funds, on behalf of the Acquiring Funds listed on Schedule A to the Agreement, severally and not jointly.

SCHEDULE A

List of Funds to Which the Agreement Applies