Company: KROS
Filing Date: 2025-10-15
Form Type: SC TO-C
Source: 0001104659-25-099513
Chunk: 6

Company: Keros Therapeutics, Inc.
Filing Date: 2025-10-15
Form: SC TO-C
Chunk 6
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 2025, by and between the Company and Pontifax.         |
|:------------|:----|:---------------------------------------------------------------------------------------------------------|
| 99.1        |     | Press Release, dated October 15, 2025.                                                                   |
| 104         |     | Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL document) |

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<div align='center'>sIGNATURES</div>

Pursuant to the requirements
of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto
duly authorized.

| KEROS THERAPEUTICS, INC. |                         |
| By:                      | /s/ Jasbir Seehra       |
|                          | Jasbir Seehra, Ph.D.    |
|                          | Chief Executive Officer |

Dated: October 15, 2025

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