Keros Therapeutics, Inc.: 5%+ holders

Keros Therapeutics, Inc. has 16 Schedule 13D or 13G filings on record since 2025-08-21. 3 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.

Holders

Purpose of Transaction (Item 4)

ADAR1 Capital Management, LLC

Item 4 of the Schedule 13D is hereby amended and supplemented by the addition of the following: On October 15, 2025, ADAR 1 Partners, LP, ADAR1 SPV I, LP and Spearhead Insurance Solutions IDF, LLC (the "ADAR1 Funds") and ADAR1 Capital Management (together with the ADAR1 Funds, the "ADAR1 Parties") entered into a stock purchase agreement (the "Stock Purchase Agreement") with the Issuer pursuant to which the ADAR1 Funds agreed to sell a total of 5,389,264 shares of Common Stock to the Issuer at a price equal to $17.75 per share, for an aggregate price of $95,659,436. The Stock Purchase Agreement also includes certain standstill provisions during the Standstill Period (as defined in the Stock Purchase Agreement), including, among other things, a restriction on the ability of the ADAR1 Parties to acquire an ownership interest of more than 4.9% of the outstanding shares of Common Stock. The foregoing description of the Stock Purchase Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Stock Purchase Agreement, the form of which is attached hereto as Exhibit I and is incorporated herein by reference.Item 4 of the SCHEDULE 13D/A filed 2025-10-15

Pontifax Management 4 GP (2015) Ltd.

Item 4 is hereby amended and supplemented with the addition of the following: On October 15, 2025, certain of the Reporting Persons (collectively, the "Pontifax Parties") and the Issuer entered into a Stock Purchase Agreement (the "Repurchase Agreement"). Pursuant to the Repurchase Agreement, the Pontifax Parties agreed to sell a total of 4,787,331 shares of Common Stock, representing all the shares of Common Stock owned by the Reporting Persons, at a per share price of $17.75, for an aggregate price of $84,975,125.25. Pursuant to the Repurchase Agreement, the Pontifax Parties also agreed to certain standstill restrictions and voting commitments during the Standstill Period (as defined in the Repurchase Agreement), including, among other things, a restriction on the ability of the Pontifax Parties to acquire more than 100,000 shares of Common Stock (subject to certain limited exceptions and adjustments). The Issuer and the Pontifax Parties have also agreed to certain mutual non-disparagement obligations that remain in effect during the Standstill Period. In addition, concurrently with the execution of the Repurchase Agreement, each of Tomer Kariv and Ran Nussbaum, affiliates of the Pontifax Parties, delivered their resignations from the Issuer's board of directors and all committees thereof. The foregoing description of the Repurchase Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Repurchase Agreement, which …The first part of Item 4 of the SCHEDULE 13D/A filed 2025-10-16; the filing has the rest

Timeline

Where this comes from

Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.

Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.

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