Nantahala Capital Management, LLC

Position in KROS — Keros Therapeutics, Inc.

CIK 1472322 New Canaan, CT

Back to KROS Full portfolio

Position in KROS

as of Jun 30, 2026 · filed Aug 19, 2026 Compact

Position Value

$15,091,483

+$72,458 QoQ

Shares Held

1,410,419

+3.7% QoQ

Ownership

7.11%

of shares outstanding

% of Portfolio

0.92%

of 13F equity value

Holder Rank

of 131 holders

Holding Since

Jun 2020

25 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Common Shares in KROS Over Time

Shares Held

Position Value (USD)

Derivatives in KROS

reported options exposure · as of Dec 31, 2025

CallValue

$5,090,000

CallShares

250,000

PutValue

PutShares

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Biotechnology

Healthcare · as of Jun 30, 2026

Nantahala Capital Management, LLC holds $620,287,047 across 52 Biotechnology names. KROS ranks #19 (2.4% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	SVRA	Savara Inc	6,976,810	$42,977,149
2	AVTX	Avalo Therapeutics, Inc.	1,862,250	$34,414,380
3	LBRX	Lb Pharmaceuticals Inc	1,052,894	$34,171,674
4	ABEO	Abeona Therapeutics Inc.	5,136,490	$31,743,508
5	ZVRA	Zevra Therapeutics, Inc.	1,797,476	$25,775,805
6	MLYS	Mineralys Therapeutics, Inc.	820,481	$22,136,577
7	QURE	uniQure N.V.	455,660	$20,987,699
8	AURA	Aura Biosciences, Inc.	2,951,030	$20,952,313

All Filings in KROS

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39 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$15,091,483	1,410,419	+3.7%	Shares	Sole	2026-08-19
2026-03-31	$15,019,025	1,360,419	+277.5%	Shares	Sole	2026-05-15
2025-12-31	$5,090,000	250,000	0.0%	Call	Sole	2026-02-13
2025-12-31	$7,338,130	360,419	-70.8%	Shares	Sole	2026-02-13
2025-09-30	$19,509,049	1,233,189	-23.9%	Shares	Sole	2025-11-14
2025-09-30	$3,955,000	250,000	0.0%	Call	Sole	2025-11-14
2025-06-30	$21,636,238	1,620,692	+7.6%	Shares	Sole	2025-08-14
2025-06-30	$3,337,500	250,000	0.0%	Call	Sole	2025-08-14
2025-03-31	$2,547,500	250,000	0.0%	Call	Sole	2025-05-15
2025-03-31	$15,354,190	1,506,790	+64.7%	Shares	Sole	2025-05-15
2024-12-31	$3,957,500	250,000	+2093.0%	Call	Sole	2025-02-14
2024-12-31	$14,485,209	915,048	+139.8%	Shares	Sole	2025-02-14
2024-09-30	$22,162,938	381,659	+0.8%	Shares	Sole	2024-11-14
2024-06-30	$17,311,479	378,807	+28.8%	Shares	Sole	2024-08-14
2024-03-31	$19,462,601	293,997	-5.2%	Shares	Sole	2024-05-15
2023-12-31	$453,264	11,400	-7.3%	Call	Sole	2024-02-14
2023-12-31	$12,331,206	310,141	-5.7%	Shares	Sole	2024-02-14
2023-09-30	$10,481,538	328,781	-33.9%	Shares	Sole	2023-11-14
2023-09-30	$392,124	12,300	0.0%	Call	Sole	2023-11-14
2023-06-30	$494,214	12,300	0.0%	Call	Sole	2023-08-14
2023-06-30	$19,975,928	497,161	-33.1%	Shares	Sole	2023-08-14
2023-03-31	$31,718,371	742,819	-6.2%	Shares	Sole	2023-05-15
2023-03-31	$525,210	12,300	-70.6%	Call	Sole	2023-05-15
2022-12-31	$2,012,038	41,900	0.0%	Call	Sole	2023-02-14
2022-12-31	$38,036,305	792,093	-6.3%	Shares	Sole	2023-02-14
2022-09-30	$31,814,933	845,692	-7.3%	Shares	Sole	2022-11-10
2022-09-30	$1,576,278	41,900	0.0%	Call	Sole	2022-11-10
2022-06-30	$1,157,697	41,900	0.0%	Call	Sole	2022-08-15
2022-06-30	$25,195,824	911,901	+11.6%	Shares	Sole	2022-08-15
2022-03-31	$44,419,215	816,830	+2.5%	Shares	Sole	2022-05-13
2022-03-31	$2,278,522	41,900	+5.5%	Call	Sole	2022-05-13
2021-12-31	$2,322,847	39,700	—	Call	Sole	2022-02-14
2021-12-31	$46,614,799	796,698	+4.8%	Shares	Sole	2022-02-14
2021-09-30	$30,080,751	760,383	+27.0%	Shares	Sole	2021-11-15
2021-06-30	$25,434,433	598,880	+30.1%	Shares	Sole	2021-08-16
2021-03-31	$28,335,896	460,372	-13.9%	Shares	Sole	2021-05-14
2020-12-31	$37,704,617	534,514	+93.1%	Shares	Sole	2021-02-16
2020-09-30	$10,677,217	276,827	+0.7%	Shares	Sole	2020-11-16
2020-06-30	$10,315,250	275,000	—	Shares	Sole	2020-08-14
No filing history on record for this holder in this stock.