Company: NLY-PF
Filing Date: 2025-08-07
Form Type: 8-A12B
Source: 0001193125-25-174940
Chunk: 0

Company: ANNALY CAPITAL MANAGEMENT INC
Filing Date: 2025-08-07
Form: 8-A12B
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 ANNALY CAPITAL MANAGEMENT, INC. (Exact Name of Registrant as Specified in Its Charter)

| Maryland                                               |     |                          22-3479661 |
| (State of incorporation or organization)               |     | -I.R.S. Employer Identification No. |
| 1211 Avenue of the Americas                            
 New York, New York                                     |     |                               10036 |
| (Address of Principal Executive Offices of Registrant) |     |                           -Zip Code |

Securities to be registered pursuant to Section 12(b) of the Act:

| Title of Each Class                                              
 to be so Registered                                              |     | Name of Each Exchange on Which 
 Each Class is to be Registered |
| 8.875% Series J Fixed-Rate Cumulative Redeemable Preferred Stock |     | New York Stock Exchange        |

If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c), please check the following box. ☒ If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d), please check the following box. ☐ Securities Act registration statement file number to which this form relates: 333-282261 Securities to be registered pursuant to Section 12(g) of the Act: None.

INFORMATION REQUIRED IN REGISTRATION STATEMENT Item 1. Description of Registrant’s Securities to be Registered. The descriptions of the general terms and provisions of the 8.875% Series J Fixed-Rate Cumulative Redeemable Preferred Stock of Annaly Capital Management, Inc. (the “Registrant”), to be registered hereby, contained under the heading “Description of the Series J Preferred Stock” in the Registrant’s Prospectus Supplement, dated July 31, 2025, to the Prospectus contained in the Registration Statement and filed pursuant to Rule 424(b) of the Securities Act of 1933, as amended, are incorporated by reference herein. Item 2. Exhibits.

| Exhibit |     | Description                                                                                                                                                     |
| 3.1     |     | Articles of