Company: KROS
Filing Date: 2025-04-10
Form Type: 8-A12B
Source: 0001664710-25-000035
Chunk: 1

Company: Keros Therapeutics, Inc.
Filing Date: 2025-04-10
Form: 8-A12B
Chunk 1
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 of April 9, 2025 (the “Rights Agreement”), by and between the Company and Computershare Trust Company, N.A., a federally chartered trust company, as rights agent. The dividend is payable to stockholders holders of record of the Company as of the close of business on April 24, 2025.

Each Right will allow its holder to purchase from the Company one one-thousandth of a share of Series A Junior Participating Preferred Stock, par value $0.0001 per share, for $165.00, once the Rights become exercisable.

The Rights are in all respects subject to and governed by the provisions of the Rights Agreement, which is incorporated herein by reference. The description of the Rights is incorporated herein by reference to the description set forth under Items 1.01, 3.03 and 5.03 of the Company’s Current Report on Form 8-K filed on April 10, 2025 and is qualified in its entirety by reference to the full text of the Rights Agreement included as Exhibit 4.1 to such Current Report.

## Item 2. Exhibits.

### SIGNATURE
Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized.

| Dated: April 10, 2025 |     |                          |     |                                |
|:----------------------|:----|:-------------------------|:----|:-------------------------------|
|                       |     | KEROS THERAPEUTICS, INC. |     |                                |
|                       |     | By:                      |     | /s/ Jasbir Seehra              |
|                       |     |                          |     | Name: Jasbir Seehra            |
|                       |     |                          |     | Title: Chief Executive Officer |