UNITED STATES
SECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549

SCHEDULE 14A(Rule 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT
SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934 (Amendment No. )

Filed by the Registrant x

Filed by a Party other than the Registrant ¨

Check the appropriate box:

¨    Preliminary Proxy Statement

¨Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨    Definitive Proxy Statement

x    Definitive Additional Materials

¨    Soliciting Material Pursuant to §240.14a-12

ARMOUR Residential REIT, Inc.
 (Name of Registrant as Specified In Its Charter)

                           Not Applicable

(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

Payment of Filing Fee (Check the appropriate box):

x    No fee required.

¨    Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

(1)    Title of each class of securities to which transaction applies:

(2)    Aggregate number of securities to which transaction applies:

(3) Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

(4) Proposed maximum aggregate value of transaction:

(5) Total fee paid:

¨    Fee paid previously with preliminary materials.

¨ Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

(1)     Amount Previously Paid:

(2)    Form, Schedule or Registration Statement No.:

(3)     Filing Party:

(4)     Date Filed:

EXPLANATORY NOTE

ARMOUR Residential REIT, Inc. confirms that its virtual-only annual meeting will be held on Wednesday, May 20, 2020, at 8:00 a.m. (EDT). Further information may be found at www.cstproxy.com/armourreit/2020.

The definitive proxy statement on Schedule 14A filed by ARMOUR Residential REIT, Inc. with the Securities and Exchange Commission on April 9, 2020 (the “Proxy Statement”) referred to May 20, 2020 as Tuesday; however May 20, 2020 is a Wednesday, not a Tuesday. This supplement does not otherwise update or modify in any way the Proxy Statement as previously filed. From and after the date of this supplement, all references to “Proxy Statement” are to the Proxy Statement as supplemented hereby.