Company: KROS
Filing Date: 2025-10-20
Form Type: SC TO-I
Source: 0001104659-25-100554
Chunk: 0

Company: Keros Therapeutics, Inc.
Filing Date: 2025-10-20
Form: SC TO-I
Chunk 0
---
SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(d)(1) OR 13(e)(1)
OF THE SECURITIES EXCHANGE ACT OF 1934 Keros Therapeutics, Inc. (Name of Subject Company (Issuer)) Keros Therapeutics, Inc. (Names of Filing Persons (Issuer and Offeror)) Common Stock, $0.0001 par value per share (Title of Class of Securities) 492327101 (CUSIP Number of Class of Securities) Jasbir Seehra
Chief Executive Officer
Keros Therapeutics, Inc.
1050 Waltham Street, Suite 302
Lexington, Massachusetts 02421
Tel: (617) 314-6297 (Name, Address and Telephone Number of Person Authorized to
Receive Notices and Communications on Behalf of Filing Persons) With copies to:

| ​ | Marc A. RechtRyan S. SansomKevin CooperWilliam RoeggeCooley LLP500 Boylston StreetBoston, Massachusetts 02116(617) 937-2300 | ​ | ​ | Esther ChoGeneral CounselKeros Therapeutics, Inc.1050 Waltham Street, Suite 302Lexington, Massachusetts 02421(617) 314-6297 | ​ | ​ | Gregory P. RodgersNathan AjiashviliLatham & Watkins LLP1271 Avenue of the AmericasNew York, New York 10020(212) 906-1200 | ​ |

☐ Check the box if the filing relates solely to preliminary communications made before the commencement of a tender offer. Check the appropriate boxes below to designate any transactions to which the statement relates: ☐ third-party tender offer subject to Rule 14d-1. ☒ issuer tender offer subject to Rule 13e-4. ☐ going-private transaction subject to Rule 13e-3. ☐ amendment to Schedule 13D under Rule 13d-2. Check the following box if the filing is a final amendment reporting the results of the tender offer: ☐ If applicable, check the appropriate box(es) below to designate the appropriate rule provision(s) relied upon: ☐ Rule 13e-4(i) (Cross-Border Issuer Tender Offer) ☐ Rule 14d-1(d) (Cross-Border Third-Party Tender Offer)

### INTRODUCTION
This Tender Offer Statement on Schedule TO (this “