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Filing Details

Accession Number:: 0001104659-25-034321
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2025-04-11 21:57:19
Reporting Period:: 2025-04-09

Filing Date:: 2025-04-11
Accepted Time:: 2025-04-11 21:57:19
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1664710	Keros Therapeutics Inc.	KROS	Pharmaceutical Preparations (2834)	811173868

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1758866	Adar1 Partners, Lp	3503 Wild Cherry Drive Building 9 Austin TX 78738	No	No	Yes	No
1861120	Daniel Schneeberger	3503 Wild Cherry Drive Building 9 Austin TX 78738	No	No	Yes	No
1940267	Adar1 Capital Management Gp, Llc	3503 Wild Cherry Drive Building 9 Austin TX 78738	No	No	Yes	No
1940272	Adar1 Capital Management, Llc	3503 Wild Cherry Drive Building 9 Austin TX 78738	No	No	Yes	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2025-04-09	18,560	$9.40	3,493,404	No	4	P	Indirect	By ADAR1 Partners, LP
Common Stock	Acquisiton	2025-04-09	16,365	$9.40	743,558	No	4	P	Indirect	By Spearhead Insurance Solutions IDF, LLC
Common Stock	Acquisiton	2025-04-09	325,000	$9.86	3,818,404	Yes	4	P	Indirect	By ADAR1 Partners, LP
Common Stock	Acquisiton	2025-04-09	500,000	$10.33	4,318,404	Yes	4	P	Indirect	By ADAR1 Partners, LP
Common Stock	Acquisiton	2025-04-09	74,333	$10.33	4,392,737	Yes	4	P	Indirect	By ADAR1 Partners, LP

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	By ADAR1 Partners, LP
No	4	P	Indirect	By Spearhead Insurance Solutions IDF, LLC
Yes	4	P	Indirect	By ADAR1 Partners, LP
Yes	4	P	Indirect	By ADAR1 Partners, LP
Yes	4	P	Indirect	By ADAR1 Partners, LP

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Cash-Settled Total Return Swaps	Disposition	2025-04-09	325,000	$0.00	325,000	$0.00
Common Stock	Cash-Settled Total Return Swaps	Disposition	2025-04-09	500,000	$0.00	500,000	$0.00
Common Stock	Cash Settled Total Return Swaps	Disposition	2025-04-09	74,333	$0.00	74,333	$0.00

Remaning Holdings	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
624,333	No	4	J	Indirect
124,333	No	4	J	Indirect
50,000	No	4	J	Indirect

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	254,669	Indirect	By ADAR1 SPV I, LP

Footnotes

As the investment manager of ADAR1 Partners, LP and ADAR1 SPV I, LP and as the sub-advisor of Spearhead Insurance Solutions IDF, LLC, ADAR1 Capital Management, LLC may be deemed to indirectly beneficially own securities held by ADAR1 Partners, LP, ADAR1 SPV I, LP and Spearhead Insurance Solutions IDF, LLC. As the general partner of ADAR1 Partners, LP and ADAR1 SPV I, LP, ADAR1 Capital Management GP, LLC may be deemed to indirectly beneficially own securities held by ADAR1 Partners, LP and ADAR1 SPV I, LP. As the manager of ADAR1 Capital Management, LLC and ADAR1 Capital Management GP, LLC, Mr. Schneeberger may be deemed to indirectly beneficially own securities held by ADAR1 Partners, LP, Spearhead Insurance Solutions IDF, LLC, and ADAR1 SPV I, LP.
The reported price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $9.21 to $9.56, inclusive.
The reported price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $9.21 to $9.56, inclusive.
The reported price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $9.13 to $10.60, inclusive.
In connection with the purchase of 325,000 securities reported as being purchased in Table 1, ADAR1 Partners, LP and the counterparty to the cash-settled total equity swaps previously reported agreed to reduce the number of notional shares of Common Stock of the Issuer in the applicable basket by a corresponding number of 325,000 shares. As a result, the aggregate number of notional shares of Common Stock of the Issuer in the applicable basket after giving effect to such transactions is 624,333 shares.
In connection with the purchase of 500,000 securities reported as being purchased in Table 1, ADAR1 Partners, LP and the counterparty to the cash-settled total equity swaps previously reported agreed to reduce the number of notional shares of Common Stock of the Issuer in the applicable basket by a corresponding number of 500,000 shares. As a result, the aggregate number of notional shares of Common Stock of the Issuer in the applicable basket after giving effect to such transactions is 124,333 shares.
In connection with the purchase of 74,333 securities reported as being purchased in Table 1, ADAR1 Partners, LP and the counterparty to the cash-settled total equity swaps previously reported agreed to reduce the number of notional shares of Common Stock of the Issuer in the applicable basket by a corresponding number of 74,333 shares. As a result, the aggregate number of notional shares of Common Stock of the Issuer in the applicable basket after giving effect to such transactions is 50,000 shares.
For purposes of Section 16 of the Securities Exchange Act of 1934, as amended, each Reporting Person disclaims beneficial ownership of any such securities, except to the extent of his/its pecuniary interest therein, if any, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of such securities for purposes of Section 16 or otherwise.