Post-Effective Amendment to Registration Statement - Form POS AMI

As filed with the Securities and Exchange Commission on May 1, 2024

1940 Act File No. 811-23239

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-1A

(Check appropriate box or boxes.)

AMERICAN BEACON INSTITUTIONAL FUNDS TRUST

(Exact Name of Registrant as Specified in Charter)

220 East Las Colinas Boulevard, Suite 1200
Irving, Texas 75039
(Address of Principal Executive Offices) (Zip Code)

Registrant's Telephone Number, including Area Code: (817) 391-6100

Rebecca L. Harris, President
220 East Las Colinas Boulevard
Suite 1200
Irving, Texas 75039
(Name and Address of Agent for Service)

With copies to:
Kathy K. Ingber, Esq.
K&L Gates LLP
1601 K Street, NW
Washington, D.C. 20006-1600

PART C
OTHER INFORMATION

Item 28. Exhibits

2

3

Item 29. Persons Controlled by or under Common Control with Registrant

None.

Item 30. Indemnification

Article VII of the Amended and Restated Declaration of Trust of the Trust provides that:

        Section 7.2     Limitation of Liability. No person who is or has been a Trustee or officer of the Trust shall be liable to the Trust, or a Series or a Shareholder for any action or failure to act or for any other reason except solely for his or her own willful misfeasance, bad faith, gross negligence or reckless disregard of the duties involved in the conduct of his or her office of Trustee or officer, and shall not be liable for errors of judgment or mistakes of fact or law. Subject to the foregoing: (i) the Trustees shall not be responsible or liable in any event for any neglect or wrongdoing of any other person, including any officer, agent, employee, independent contractor or consultant, nor shall any Trustee be responsible for the act or omission of any other Trustee; (ii) the Trustees may rely upon advice of legal counsel or other experts and shall be under no liability for any act or omission in accordance with such advice or for failing to follow such advice; and (iii) the Trustees shall be entitled to rely upon the records of the Trust and upon information, opinions, reports or statements presented by another Trustee or any officer, employee or agent of the Trust, or by any other Person, as to

4

matters reasonably believed to be within such Person's professional or expert competence. The appointment, designation or identification of a Trustee as an expert on any topic or in any area (including an audit committee financial expert), or any other special appointment, designation or identification of a Trustee, shall not impose on that Trustee any standard of care or liability that is greater than that imposed on him as a Trustee in the absence of the appointment, designation or identification, and no Trustee who has special skills or expertise, or is appointed, designated or identified as aforesaid, shall be held to a higher standard of care by virtue thereof. The Trustees shall not be required to give any bond as such, nor any surety if a bond is obtained.

        All Persons extending credit to, contracting with or having any claim against the Trust or any Series shall look only to the assets of the Trust or any applicable Series that such Person extended credit to, contracted with or has a claim against, and neither the Trustees nor the Shareholders, nor any of the Trust's officers, employees or agents, whether past, present or future, shall be personally liable therefor.

        Every note, bond, contract, instrument, certificate or undertaking and every other act or thing whatsoever executed or done by or on behalf of the Trust or any Series or the Trustees or officers by any of them in connection with the Trust shall conclusively be deemed to have been executed or done only in or with respect to his or their capacity as Trustee or Trustees, and such Trustee or Trustees shall not be personally liable thereon. At the Trustees' discretion, any note, bond, contract, instrument, certificate or undertaking or any Series made or issued by the Trustees or by any officer or officers may give notice that the Certificate of Trust is on file in the Office of the Delaware Secretary of State and that a limitation on liability of Series exists and such note, bond, contract, instrument, certificate or undertaking may, if the Trustees so determine, recite that the same was executed or made on behalf of the Trust by a Trustee or Trustees in such capacity and not individually or by an officer or officers in such capacity and not individually and that the obligations of such instrument are not binding upon any of them or the Shareholders individually but are binding only on the assets and property of the Trust or a Series thereof, and may contain such further recital as such Person or Persons may deem appropriate. The omission of any such notice or recital shall in no way operate to bind any Trustees, officers or Shareholders individually.

        Section 7.5           Indemnification.

(a) Subject to the exceptions and limitations contained in subsection (b) below;

(b) To the extent required under the 1940 Act and the rules and regulations thereunder as amended from time to time and interpretations thereunder, but only to such extent, no indemnification shall be provided hereunder to a Covered Person;

(c) The rights of indemnification herein provided may be insured against by policies maintained by the Trust, shall be severable, shall not be exclusive of or affect any other rights to which any Covered Person may now or hereafter be entitled, shall continue as to a person who has ceased to be such Covered Person and shall inure to the benefit of the heirs, executors and administrators of a Covered Person.

(d) To the extent that any determination is required to be made as to whether a Covered Person engaged in conduct for which indemnification is not provided as described herein, or as to whether there is reason to believe that a Covered Person ultimately will be found entitled to indemnification, the Person or Persons making the determination shall afford the Covered Person a rebuttable presumption that the Covered Person has not engaged in such conduct and that there is reason to believe that the Covered Person ultimately will be found entitled to indemnification.

(e) To the maximum extent permitted by applicable law, including Section 17(h) of the 1940 Act and the rules and regulations thereunder as amended from time to time and interpretations thereunder, expenses in connection with the preparation and presentation of a defense to any claim, action, suit or proceeding of the character described in subsection (a) of this Section 7.5, shall be paid by the Trust or the applicable Series from time to time prior to final disposition thereof upon receipt of an undertaking by or on behalf of such Covered Person that such amount will be paid over by him or her to the Trust or a Series, as applicable, if it is ultimately determined that he or she is not entitled to indemnification under this Section; provided, however,

5

that any such advancement will be made in accordance with any conditions required by the Commission. The advancement of any expenses pursuant to this Section 7.5(e) shall under no circumstances be considered a "loan" under the Sarbanes-Oxley Act of 2002, as amended from time to time, or for any other reason.

(f) Any repeal or modification of this Article VII or adoption or modification of any other provision of this Declaration of Trust inconsistent with this Article shall be prospective only to the extent that such repeal or modification would, if applied retrospectively, adversely affect any limitation on the liability of any Covered Person or indemnification or right to advancement of expenses available to any Covered Person with respect to any act or omission that occurred prior to such repeal, modification or adoption.

(g) Notwithstanding any other provision in this Declaration of Trust to the contrary, any liability and/or expense against which any Covered Person is indemnified under this Section 7.5 and any advancement of expenses that any Covered Person is entitled to be paid under Section 7.5(e) shall be deemed to be joint and several obligations of the Trust and each Series, and the assets of the Trust and each Series shall be subject to the claims of any Covered Person therefor under this Article VII; provided that (a) any such liability, expense or obligation may be allocated and charged by the Trustees between or among the Trust and/or any one or more Series (and Classes) in such manner as the Trustees in their sole discretion deem fair and equitable; and (b) the Trustees may determine that any such liability, expense or obligation should not be allocated to one or more Series (and Classes), and such Series or Classes shall not be liable therefor as provided under Section 3.6(a) and (b).

        Section 7.6           Further Indemnification. Nothing contained herein shall affect any rights to indemnification to which any Covered Person or other Person may be entitled by contract or otherwise under law or prevent the Trust from entering into any contract to provide indemnification to any Covered Person or other Person. Without limiting the foregoing, the Trust may, in connection with any transaction permitted by this Declaration of Trust, including the acquisition of assets subject to liabilities or a merger or consolidation pursuant to Section 8.3 hereof, assume the obligation to indemnify any Person including a Covered Person or otherwise contract to provide such indemnification, and such indemnification shall not be subject to the terms of this Article VII unless otherwise required under applicable law.

Numbered Paragraph 10 of the Management Agreement provides that:

10. Limitation of Liability of the Manager. The Manager shall not be liable for any error of judgment or mistake of law or for any loss suffered by the Trust or any Fund in connection with the matters to which this Agreement relate except a loss resulting from the willful misfeasance, bad faith or gross negligence on its part in the performance of its duties or from reckless disregard by it of its obligations and duties under this Agreement. Any person, even though also an officer, partner, employee, or agent of the Manager, who may be or become an officer, Board member, employee or agent of the Trust shall be deemed, when rendering services to the Trust or acting in any business of the Trust, to be rendering such services to or acting solely for the Trust and not as an officer, partner, employee, or agent or one under the control or direction of the Manager even though paid by it. The U.S. federal and state securities laws impose liabilities on persons who act in good faith, and, therefore, nothing in this Agreement is intended to limit the obligations of the Manager under such laws. This Paragraph 10 does not in any manner preempt any separate written indemnification commitments made by the Manager with respect to any matters encompassed by this Agreement.

Numbered Paragraph 9 of the Investment Advisory Agreement with Aristotle Capital Management, LLC provides that:

9. Liability of Adviser. The Adviser shall have no liability to the Trust, its shareholders or any third party arising out of or related to this Agreement, provided however, the Adviser agrees to indemnify and hold harmless, the Manager, any affiliated person within the meaning of Section 2(a)(3) of the Investment Company Act, and each person, if any, who, within the meaning of Section 15 of the Securities Act, controls the Manager, against any and all losses, claims, damages, liabilities or litigation (including reasonable legal and other expenses), to which the Manager or such affiliated person or controlling person may become subject under the securities laws, any other federal or state law, at common law or otherwise, arising out of the Adviser's responsibilities to the Trust which may be based upon any willful misfeasance, bad faith, gross negligence, or reckless disregard of, the Adviser's obligations and/or duties under this Agreement by the Adviser or by any of its directors, officers, employees, agents, or any affiliate acting on behalf of the Adviser. The indemnification in this Section shall survive the termination of this Agreement.

Numbered Paragraph 9 of the Investment Advisory Agreement with Barrow, Hanley, Mewhinney & Strauss, LLC provides that:

9. Liability of Adviser. The Adviser shall have no liability to the Trust, its shareholders or any third party arising out of or related to this Agreement except with respect to claims which occur due to any willful misfeasance, bad faith, or gross negligence in the performance of its duties or the reckless disregard of its obligations under this Agreement.

Numbered Paragraph 11 of the Investment Advisory Agreement with Brandywine Global Investment Management, LLC provides that:

11. Liability of Adviser. No provision of this Agreement shall be deemed to protect the Adviser against any liability to the Trust or its shareholders to which it might otherwise be subject by reason of any willful misfeasance, bad faith, or gross negligence in the performance of its duties or the reckless disregard of its obligations under this Agreement.

Numbered Paragraph 9 of the Investment Advisory Agreement with Hotchkis and Wiley Capital Management, LLC provides that:

9. Liability of Adviser. No provision of this Agreement shall be deemed to protect the Adviser against any liability to the Trust or its shareholders to which it might otherwise be subject by reason of any willful misfeasance, bad faith, or gross negligence in the performance of its duties or the reckless disregard of its obligations under this Agreement.

Numbered Paragraph 8 of the Investment Advisory Agreement with Lazard Asset Management LLC provides that:

8. Liability of Adviser. No provision of this Agreement shall be deemed to protect the Adviser against any liability to the Trust or its shareholders to which it might otherwise be subject by reason of any willful misfeasance, bad faith, or gross negligence in the performance of its duties or the reckless disregard of its obligations under this Agreement.

Numbered Paragraph 9 of the Investment Advisory Agreement with WCM Investment Management, LLC provides that:

6

9. Liability of Adviser. The Adviser shall have no liability to the Trust, its shareholders or any third party arising out of or related to this Agreement, provided however, the Adviser agrees to indemnify and hold harmless, the Manager, any affiliated person within the meaning of Section 2(a)(3) of the Investment Company Act, and each person, if any, who, within the meaning of Section 15 of the Securities Act, controls the Manager, against any and all losses, claims, damages, liabilities or litigation (including reasonable legal and other expenses), to which the Manager or such affiliated person or controlling person may become subject under the securities laws, any other federal or state law, at common law or otherwise, arising out of the Adviser's responsibilities to the Trust which may be based upon any willful misfeasance, bad faith, gross negligence, or reckless disregard of, the Adviser's obligations and/or duties under this Agreement by the Adviser or by any of its directors, officers, employees, agents, or any affiliate acting on behalf of the Adviser. The indemnification in this Section shall survive the termination of this Agreement.

Supplemental Limited Indemnification from the Manager

ABA shall indemnify and hold harmless Indemnitee, in his or her individual capacity, from and against any cost, asserted claim, liability or expense, including reasonable legal fees (collectively, "Liability") based upon or arising out of (i) any duty of ABA under the Management Agreement (including ABA's failure or omission to perform such duty), and (ii) any liability or claim against Indemnitee arising pursuant to Section 11 of the Securities Act of 1933, as amended, Rule 10b-5 under the Securities Exchange Act of 1934, as amended, and any similar or related federal, state or common law statutes, rules or interpretations. ABA's indemnification obligations under this Letter Agreement shall be limited to civil and administrative claims or proceedings.

Item 31.

I. Business and Other Connections of Investment Manager

American Beacon Advisors, Inc. (the "Manager") offers investment management and administrative services to the Registrant. It acts in the same capacity to other investment companies, including those listed below.

Set forth below is information as to any other business, profession, vocation or employment of a substantial nature in which each officer and director of American Beacon Advisors, Inc. is, or at any time during the past two fiscal years has been, engaged for his/her own account or in the capacity of director, officer, employee, partner or trustee.

7

The principal address of each of the entities referenced above, other than, National Investment Services of America, LLC, RSW Investment Holdings LLC, Shapiro Capital Management LLC and SSI Investment Management LLC, is 220 East Las Colinas Blvd., Suite 1200, Irving, Texas 75039. The principal address of National Investment Services of America, LLC is 777 E. Wisconsin Avenue, Suite 2350, Milwaukee, Wisconsin 53202. The principal address of RSW Investment Holdings LLC is 47 Maple Street, Suite 304, Summit, New Jersey 07901. The principal address of Shapiro Capital Management LLC is 3060 Peachtree Road NW #1555, Atlanta, Georgia 30305. The principal address of SSI Investment Management LLC is 9440 Santa Monica Blvd, 8th Floor, Beverly Hills, California 90210.

II. Business and Other Connections of Investment Advisers

The investment advisers listed below provide investment advisory services to the Trust.

American Beacon Advisors, Inc., 220 East Las Colinas Blvd., Suite 1200, Irving, TX 75039.

Aristotle Capital Management, LLC  ("Aristotle") is a registered investment adviser and is an investment sub-advisor for the American Beacon Diversified Fund. The principal address of Aristotle is 11100 Santa Monica Boulevard, Suite 1700, Los Angeles, CA 90025. Information as to the officers and directors of Aristotle is included in its Form ADV, as filed with the Securities and Exchange Commission ("SEC") (CRD number 109876), and is incorporated herein by reference.

Barrow, Hanley, Mewhinney & Strauss, LLC ("Barrow") is a registered investment adviser and is an investment sub-advisor for the American Beacon Diversified Fund, as well as American Beacon Balanced Fund, American Beacon Large Cap Value Fund, American Beacon Mid-Cap Value Fund and American Beacon Small Cap Value Fund, which are series of American Beacon Funds. The principal business address of Barrow is 2200 Ross Avenue, 31st Floor, Dallas, TX 75201-2761. Information as to the officers and directors of Barrow is included in its Form ADV, as filed with the SEC (CRD number 105519), and is incorporated herein by reference.

8

Brandywine Global Investment Management, LLC ("Brandywine") is a registered investment adviser and is an investment sub-advisor for the American Beacon Diversified Fund, as well as American Beacon Small Cap Value Fund, which is a series of American Beacon Funds. The principal address of Brandywine is 1735 Market Street, Suite 1800, Philadelphia, PA 19103. Information as to the officers and directors of Brandywine is included in its Form ADV, as filed with the SEC (CRD number 110783), and is incorporated herein by reference.

Hotchkis and Wiley Capital Management, LLC ("Hotchkis") is a registered investment adviser and is an investment sub-advisor for the American Beacon Diversified Fund, as well as American Beacon Balanced Fund, American Beacon Large Cap Value Fund, and American Beacon Small Cap Value Fund, which are series of American Beacon Funds. The principal address of Hotchkis is 601 South Figueroa Street, 39th Floor, Los Angeles, CA 90017-5439. Information as to the officers and directors of Hotchkis is included in its Form ADV, as filed with the SEC (CRD number 114649), and is incorporated herein by reference.

Lazard Asset Management, LLC ("Lazard") is a registered investment adviser and is an investment sub-advisor for the American Beacon Diversified Fund, as well as American Beacon International Equity Fund, which is a series of American Beacon Funds. The principal address of Lazard is 30 Rockefeller Plaza, 56th Floor, New York, NY 10112. Information as to the officers and directors of Lazard is included in its Form ADV, as filed with the SEC (CRD number 122836), and is incorporated herein by reference.

WCM Investment Management LLC ("WCM") is a registered investment adviser and is an investment sub-advisor for the American Beacon Diversified Fund. The principal address for WCM is 281 Brooks Street, Laguna Beach, CA 92651. Information as to the Officers and Directors of WCM is included in its Form ADV, as filed with the SEC (CRD number 104702) and is incorporated herein by reference.

Item 32. Principal Underwriter

Not applicable.

Item 33. Location of Accounts and Records

The books and other documents required by Section 31(a) under the Investment Company Act of 1940 are maintained in the physical possession of 1) the Trust's custodian and fund accounting agent at State Street Bank and Trust Company, One Congress Street, Suite 1, Boston, Massachusetts 02114-2016; 2) the Manager at American Beacon Advisors, Inc., 220 East Las Colinas Blvd., Suite 1200, Irving, Texas 75039; 3) the Trust's transfer agent, SS&C GIDS, Inc., 330 West 9th St., Kansas City, Missouri 64105; 4)  Mastercraft, 3021 Wichita Court, Fort Worth, Texas 76140; or 5) the Trust's investment advisers at the addresses listed in Item 31 above.

Item 34. Management Services

Not applicable.

Item 35. Undertakings

Not applicable.

9

SIGNATURES

Pursuant to the requirements of the Investment Company Act of 1940, as amended, the Registrant has duly caused this Amendment No. 32 to its Registration Statement on Form N-1A to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Irving and the State of Texas, on May 1, 2024.

10

EXHIBIT INDEX

11