UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 1)*

ELLINGTON RESIDENTIAL MORTGAGE REIT

(Name of Issuer)

Common Shares of Beneficial Interest, $0.01 par value per share

(Title of Class of Securities)

288578 10 7

(CUSIP Number)

Menes O. Chee

The Blackstone Group Inc.

345 Park Avenue

New York, New York 10154

Tel: (212) 583-5000

with a copy to:

Brian M. Stadler

Simpson Thacher & Bartlett LLP

425 Lexington Avenue

New York, NY 10017

Tel: (212) 455-2000

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

May 27, 2020

(Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.  ☐

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties to whom copies are to be sent.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 0288578 10 7

CUSIP No. 0288578 10 7

CUSIP No. 0288578 10 7

CUSIP No. 0288578 10 7

CUSIP No. 0288578 10 7

CUSIP No. 0288578 10 7

CUSIP No. 0288578 10 7

CUSIP No. 0288578 10 7

CUSIP No. 0288578 10 7

This Amendment No. 1 (“Amendment No. 1”) to Schedule 13D amends the initial Statement on Schedule 13D filed on August 23, 2018 (as so amended, the “Schedule 13D”), relating to the Common Shares of Beneficial Interest, $0.01 par value per share (the “Common Shares”), of Ellington Residential Mortgage REIT, a Maryland corporation (the “Issuer”). This Amendment No. 1 reflects, among other things, the conversion of The Blackstone Group L.P., a Delaware limited partnership, into a Delaware corporation named The Blackstone Group Inc., which became effective on July 1, 2019. Capitalized terms used but not defined in this Amendment No. 1 shall have the same meanings ascribed to them in the Schedule 13D.

Item 2 of the Schedule 13D is hereby amended and restated as follows:

(a) – (b) Each of the following is hereinafter individually referred to as a “Reporting Person” and collectively as the “Reporting Persons”. This statement is filed on behalf of:

The principal business address of each of the Blackstone Entities and Mr. Schwarzman is c/o The Blackstone Group Inc, 345 Park Avenue, New York, NY 10154.

(c) The principal business of EARN Holdings is investing in securities. The principal business of BTO EARN Manager L.L.C. is performing the functions of, and serving as, the managing member of EARN Holdings. The principal business of BTOA L.L.C. is performing the functions of, and serving as, the sole member of BTO EARN Manager L.L.C. and in a similar capacity for other affiliated Blackstone entities. The principal business of Blackstone Holdings III L.P. is performing the functions of, and serving as, the managing member of BTOA L.L.C. and as the managing member (or similar position) and member or equity holder in other affiliated Blackstone entities. The principal business of Blackstone Holdings III GP L.P. is performing the functions of, and serving as, the general partner of Blackstone Holdings III L.P. and other affiliated Blackstone entities. The principal business of Blackstone Holdings III GP Management L.L.C. is performing the functions of, and serving as, the general partner of Blackstone Holdings III GP L.P. and other affiliated Blackstone entities. The principal business of Blackstone is performing the functions of, and serving as, the sole member of Blackstone Holdings III GP Management L.L.C. and in a similar capacity for other affiliated Blackstone entities. The principal business of Blackstone Group Management L.L.C. is performing the functions of, and serving as, the sole holder of the Class C common stock of Blackstone.

The principal occupation of Mr. Schwarzman is serving as an executive of Blackstone and Blackstone Group Management L.L.C.

(d) During the last five years, none of the Reporting Persons, or, to the best knowledge of the Reporting Persons, any of the other persons set forth on Schedule 1 attached hereto, has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) During the last five years, none of the Reporting Persons, or, to the best knowledge of the Reporting Persons, any of the other persons set forth on Schedule 1 attached hereto, has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and, as a result of such proceeding, was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f) See Item 2(a)-(b) above for citizenship or place of organization, as applicable, of each of the Reporting Persons.

Item 3 of the Schedule 13D is hereby supplemented by the following:

EARN Holdings paid an aggregate amount of approximately $1,672,363.37 to acquire 160,797 Common Shares since the filing of the original Schedule 13D on August 23, 2018. EARN Holdings’ payment of the aggregate purchase price described above was funded by capital contributions by EARN Holdings’ members.

Item 4 of the Schedule 13D is hereby amended and restated as follows:

The Reporting Persons acquired the securities reported herein for investment purposes, subject to the following:

The information set forth in Item 6 of this Schedule 13D is incorporated herein by reference.

The Reporting Persons intend to review their investment in the Issuer on an ongoing basis and, in the course of their review, may take actions (including through their affiliates) with respect to their investment or the Issuer, including communicating with the board of trustees of the Issuer (the “Board”), the Issuer’s manager, members of management or other security-holders of the Issuer, or other third parties from time to time, taking steps to implement a course of action, including, without limitation, engaging advisors, including legal, financial, regulatory, technical and/or industry advisors, to assist in any review, and evaluating strategic alternatives as they may become available. Such discussions and other actions may relate to various alternative courses of action, including, without limitation, those related to an extraordinary corporate transaction (including, but not limited to a merger, reorganization or liquidation) involving the Issuer or any of its subsidiaries; business combinations involving the Issuer or any of its subsidiaries, a sale or transfer of a material amount of assets of the Issuer or any of its subsidiaries; material asset purchases; the formation of joint ventures with the Issuer or any of its subsidiaries or the entry into other material projects; changes in the present business, operations, strategy, future plans or prospects of the Issuer, financial or governance matters; changes to the Board (including board composition) or management of the Issuer; acting as a participant in debt financings of the Issuer or any of its subsidiaries, changes to the capitalization, ownership structure, dividend policy, business or corporate structure or governance documents of the Issuer; de-listing or de-registration of the Issuer’s securities; or any action similar to those enumerated above.

Such discussions and actions may be preliminary and exploratory in nature, and not rise to the level of a plan or proposal. Subject to the terms of the other documents described herein, the Reporting Persons or their affiliates may seek to acquire securities of the Issuer, including Common Shares and/or other equity, debt, notes or other financial instruments related to the Issuer or the Common Shares (which may include rights or securities exercisable or convertible into securities of the Issuer), and/or sell or otherwise dispose of some or all of such Issuer securities or financial instruments (which may include distributing some or all of such securities to such Reporting Person’s respective partners or beneficiaries, as applicable) from time to time, in each case, in open market or private transactions, block sales or otherwise. In connection with the acquisitions described in this Schedule 13D, the Reporting Persons have evaluated and will continue to evaluate the possibility of acquiring additional Common Shares, subject to the restrictions on ownership in the Issuer’s declaration of trust. The Issuer had previously established an Excepted Holder Limit allowing EARN Holdings and its affiliates to beneficially own or constructively own up to 35% of the Common Shares. Any transaction that any of the Reporting Persons or their affiliates may pursue, subject to the terms of the other documents described herein, may be made at any time and from time to time without prior notice and will depend on a variety of factors, including, without limitation, the price and availability of the Issuer’s securities or other financial instruments, the Reporting Persons’ or such affiliates’ trading and investment strategies, subsequent developments affecting the Issuer, the Issuer’s business and the Issuer’s prospects, other investment and business opportunities available to such Reporting Persons and their affiliates, general industry and economic conditions, the securities markets in general, tax considerations and other factors deemed relevant by such Reporting Persons and such affiliates.

Menes O. Chee is an employee of The Blackstone Group Inc. or its affiliates. Mr. Chee was designated by EARN Holdings to serve as a trustee of the Board and, in such capacity, may have influence over the corporate activities of the Issuer, including activities which may relate to items described in subparagraphs (a) through (j) of Item 4 of Schedule 13D.

Except as described in this Schedule 13D, the Reporting Persons do not have any present plans or proposals that relate to or would result in any of the actions described in subparagraphs (a) through (j) of Item 4 of Schedule 13D, although, subject to the agreements described herein, the Reporting Persons, at any time and from time to time, may review, reconsider and change their position and/or change their purpose and/or develop such plans and may seek to influence management or the Board of the Issuer with respect to the business and affairs of the Issuer and may from time to time consider pursuing or proposing such matters with advisors, the Issuer or other persons.

Item 5 of the Schedule 13D is hereby amended and restated as follows:

(a) – (b) Calculations of the percentage of Common Shares beneficially owned assumes that there were 12,319,616 Common Shares outstanding as of May 5, 2020, based on the Quarterly Report on Form 10-Q filed by the Issuer on May 11, 2020.

The aggregate number and percentage of the Common Shares beneficially owned by each Reporting Person and, for each Reporting Person, the number of shares as to which there is sole power to vote or to direct the vote, shared power to vote or to direct the vote, sole power to dispose or to direct the disposition, or shared power to dispose or to direct the disposition are set forth on rows 7 through 11 and row 13 of the cover pages of this Schedule 13D and are incorporated herein by reference.

As of May 28, 2020, EARN Holdings directly held 3,166,626 Common Shares.

BTO EARN Manager L.L.C. is the managing member of EARN Holdings. BTOA L.L.C. is the sole member of BTO EARN Manager L.L.C. Blackstone Holdings III L.P. is the managing member of BTOA L.L.C. Blackstone Holdings III GP L.P. is the general partner of Blackstone Holdings III L.P. Blackstone Holdings III GP Management L.L.C. is the general partner of Blackstone Holdings III GP L.P. Blackstone is the sole member of Blackstone Holdings III GP Management L.L.C. Blackstone Group Management L.L.C. is the sole holder of Class C common stock of Blackstone. Blackstone Group Management L.L.C. is wholly owned by its senior managing directors and controlled by its founder, Stephen A. Schwarzman.

Neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission that any of the Reporting Persons (other than EARN Holdings to the extent it directly holds the Issuer securities reported herein) is the beneficial owner of the Common Shares referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended (the “Act”), or for any other purpose, and such beneficial ownership is expressly disclaimed. The filing of this statement should not be construed to be an admission that any member of the Reporting Persons are members of a “group” for the purposes of Sections 13(d) of the Act.

(c) Except as set forth on Schedule II attached hereto, as of May 28, 2020, none of the Reporting Persons or, to the best knowledge of the Reporting Persons, any other person named in Schedule II, has engaged in any transaction during the past 60 days in any Common Shares.

(d) To the best knowledge of the Reporting Persons, no one other than the Reporting Persons, or the partners, members, affiliates or shareholders of the Reporting Persons, has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Common Shares reported herein as beneficially owned by the Reporting Persons.

(e) Not applicable.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: May 29, 2020

[Ellington Residential Mortgage REIT – Schedule 13D/A]

SCHEDULE I

Executive Officers and Directors of The Blackstone Group Inc.

The name and principal occupation of each director and executive officer of The Blackstone Group Inc. are set forth below. The address for each person listed below is c/o The Blackstone Group Inc., 345 Park Avenue, New York, New York 10154. All executive officers and directors listed are United States citizens other than The Honorable Brian Mulroney, who is a citizen of Canada, and Sir John Antony Hood, who is a citizen of New Zealand.

OFFICERS:

DIRECTORS:

Except as set forth in this Schedule 13D, to the best knowledge of the Reporting Persons, none of the individuals listed above beneficially owns any shares of Common Stock.

SCHEDULE II

60 Day Trading History

The following transactions were effected by Blackstone Tactical Opportunities EARN Holdings L.L.C. in Common Shares during the past 60 days:

All transactions were made in the open market.