Company: CIMO
Filing Date: 2025-10-01
Form Type: S-3ASR
Source: 0001193125-25-226772
Chunk: 1

Company: CHIMERA INVESTMENT CORP
Filing Date: 2025-10-01
Form: S-3ASR
Chunk 1
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 is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐ If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. ☒ If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. ☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-acceleratedfiler, or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2of the Exchange Act.

| Large accelerated filer |     | ☒ |     | Accelerated filer         |     | ☐ |
| Non-accelerated filer   |     | ☐ |     | Smaller reporting company |     | ☐ |
|                         |     |   |     | Emerging growth company   |     |   |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of Securities Act. ☐

PROSPECTUS

2,077,151 Shares of Common Stock

This prospectus relates to the possible resale from time to time of up to 2,077,151 shares of our common stock, par value $0.01 per share (our “common
stock”), by the selling stockholders named in this prospectus. The selling stockholders received the shares of common stock from us pursuant to a private placement transaction in connection with our acquisition of all the outstanding equity
interests in HX Holdco Corp. (“Holdco”), a Delaware corporation and parent of HomeXpress Mortgage Corp. (“HomeXpress”), a Delaware corporation, and certain equity interests in HomeXpress held by the Management Sellers as
defined in the Stock Purchase Agreement (defined below). We own, directly and indirectly through Holdco, all the outstanding equity interests in HomeX