Company: KROS
Filing Date: 2025-10-20
Form Type: SC TO-I
Source: 0001104659-25-100554
Chunk: 4

Company: Keros Therapeutics, Inc.
Filing Date: 2025-10-20
Form: SC TO-I
Chunk 4
---
-K filed with the SEC on August 6, 2025).                                                                                                             | ​ |
| ​ | -d)(24        | ​ | ​ | Letter Agreement, dated April 17, 2025, by and between the Company and Pontifax (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the SEC on April 18, 2025).                                                                                                                                     | ​ |
| ​ | -d)(25        | ​ | ​ | Rights Agreement, dated as of April 9, 2025 between Registrant and Computershare Trust Company, N.A., which includes the form of Certificate of Designation as Exhibit A, the form of Right Certificate as Exhibit B (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed with the SEC on April 10, 2025). | ​ |
| ​ | -d)(26        | ​ | ​ | Stock Purchase Agreement, dated as of October 15, 2025, by and between the Company and ADAR1 (incorporated by reference to Exhibit 2.1 to the Company’s Current Report on Form 8-K filed with the SEC on October 15, 2025).                                                                                                                       | ​ |
| ​ | -d)(27        | ​ | ​ | Stock Purchase Agreement, dated as of October 15, 2025, by and between the Company and Pontifax (incorporated by reference to Exhibit 2.2 to the Company’s Current Report on Form 8-K filed with the SEC on October 15, 2025).                                                                                                                    | ​ |
| ​ | -g            | ​ | ​ | Not Applicable.                                                                                                                                                                                                                                                                                                                                   | ​ |
| ​ | -h            | ​ | ​ | Not Applicable.                                                                                                                                                                                                                                                                                                                                   | ​ |
| ​ | 107*          | ​ | ​ | Filing Fee Table.                                                                                                                                                                                                                                                                                                                                 | ​ |

* Filed herewith ITEM 13. INFORMATION REQUIRED BY SCHEDULE 13E-3. Not applicable.

5

SIGNATURE After due 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.

6