Keros Therapeutics KROS Insider Ownership

NASDAQ KROS

$11.39 -0.01 (-0.09%)

As of: Oct 21, 2026 · 10:11 AM EDT

Insider Holdings by Owner

2.20Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

6.30%

▲+0.266% pp QoQ

Shares Held by Insiders

1.25Mn

filed for Sep 2026

▲+4.42% QoQ

Shares Outstanding

19.83Mn

19,827,188 shares

Direct Holdings

796.57K

Indirect: 452.60K

Net Shares Traded (QoQ)

+52.83K

net buying in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 10, 2026

Over the trailing 12 months, KROS insiders bought $75,770 worth of shares (7K shares) and sold $181.13 million worth (10.21Mn shares) in open-market trades.

Counted by insider, open-market buying of KROS stock in the past 12 months came from one insider and selling from 10 insiders.
Among Keros Therapeutics' insiders, Jean Jacques Bienaime (Director) was the largest open-market buyer over the past 12 months, purchasing $75,770 of stock (7K shares), most recently on August 17, 2026.
On the selling side, Adar1 Capital Management, LLC (10% owner) was the top open-market seller of Keros Therapeutics over the past 12 months, with $95.66 million sold (5.39Mn shares) and the latest sale on October 15, 2025.
Keros Therapeutics' latest insider trade on the open market was a sale of 4.49K shares for $46,151 by Esther Cho (Chief Legal Officer) on August 18, 2026.
Beyond open-market trades, insiders at Keros Therapeutics received 34.14K shares in stock awards and acquired 55K shares through option exercises and conversions in the last 12 months.
Business Quant data shows Keros Therapeutics insiders holding 1.25Mn shares in total in their latest Form 4 filings, or 6.30% of the 19.83Mn shares outstanding; that total is up 4.42% from 1.2Mn shares at the end of Q2 2026.
Indirect holdings, through trusts, partnerships, family members and other entities, make up 36.23% (452.6K shares) of Keros Therapeutics' insider total, with the other 63.77% (796.57K shares) held directly.
KROS's insider total is spread across 17 insiders who have filed a Form 4 in the past two years.
Keros Therapeutics' three biggest insider holders are Jasbir Seehra (Chief Executive Officer, 440.71K shares), Julius Knowles (Director, 263.24K shares) and Tomer Kariv (Director and 10% owner, 160.51K shares), based on their latest Form 4 filings.
Of the shares held by KROS insiders, 35.28% belong to Jasbir Seehra.
A total of 37 Form 4 filings with transactions in Keros Therapeutics stock were made over the past 12 months, by 16 insiders.
These insider figures for Keros Therapeutics are based on Form 4 filings through August 20, 2026.

Form 4 Holdings

Insiders Holding KROS

Insiders 20

Shares held 2.20Mn

Of outstanding 11.11%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Management 4 G.P. (2015) Ltd. Pontifax	TenPercentOwner	0	1,226,412	1,226,412	55.7%	30 Nov, 2022
2	Jasbir Seehra	Chief Executive Officer	440,708	0	440,708	20.0%	06 Apr, 2026
3	Jennifer Lachey	Chief Scientific Officer	95,100	0	95,100	4.3%	19 Jul, 2022
4	Christopher Rovaldi	Chief Operating Officer	60,000	0	60,000	2.7%	19 Feb, 2025
5	Annita Tanini	Corp. Controller Vp, Finance	45,144	0	45,144	2.0%	20 Aug, 2026
6	Carl L Gordon	Director	0	45,057	45,057	2.0%	18 Dec, 2025
7	Advisors Llc Orbimed	Director	0	45,057	45,057	2.0%	18 Dec, 2025
8	Yung H. Chyung	Chief Medical Officer	44,000	0	44,000	2.0%	19 Feb, 2025
9	Keith Regnante	Chief Financial Officer	39,261	0	39,261	1.8%	20 Feb, 2026
10	Esther Cho	Chief Legal Officer	35,770	0	35,770	1.6%	20 Aug, 2026
11	Lorena Raquel Lerner	Chief Scientific Officer	27,559	0	27,559	1.3%	20 Aug, 2026
12	Jean Jacques Bienaime	Director	19,592	0	19,592	0.9%	19 Aug, 2026
13	Anne Prener	Director	13,786	0	13,786	0.6%	06 Jul, 2026
14	Mary Ann Gray	Director	12,392	0	12,392	0.6%	05 Jun, 2026
15	Charles W. Newton	Director	12,114	0	12,114	0.5%	20 Aug, 2026
16	Julius Knowles	Director	10,958	0	10,958	0.5%	08 Jun, 2026
17	Nima Farzan	Director	9,767	0	9,767	0.4%	08 Jun, 2026
18	Alpna Seth	Director	9,767	0	9,767	0.4%	08 Jun, 2026
19	Ran Nussbaum	Director, TenPercentOwner	5,250	0	5,250	0.2%	06 Jun, 2025
20	Tomer Kariv	Director, TenPercentOwner	5,250	0	5,250	0.2%	06 Jun, 2025

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

703 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
18 Aug, 2026	Esther Cho	Chief Legal Officer	Disposed S	4,485	$10.29	$46.15K	35,770	Direct
18 Aug, 2026	Lorena Raquel Lerner	Chief Scientific Officer	Disposed S	3,568	$10.29	$36.71K	27,559	Direct
18 Aug, 2026	Charles W. Newton	Director	Disposed S	551	$10.30	$5.68K	12,114	Direct
18 Aug, 2026	Annita Tanini	Corp. Controller Vp, Finance	Disposed S	1,224	$10.29	$12.59K	45,144	Direct
17 Aug, 2026	Jean Jacques Bienaime	Director	Acquired P	1,000	$10.27	$10.27K	19,592	Direct
15 Jul, 2026	Jean Jacques Bienaime	Director	Acquired P	1,000	$10.61	$10.61K	18,592	Direct
01 Jul, 2026	Anne Prener	Director	Acquired A	13,786	$0.00	$0	13,786	Direct
01 Jul, 2026	Anne Prener	Director	Acquired A	14,870	$0.00	$0	14,870	Direct
15 Jun, 2026	Jean Jacques Bienaime	Director	Acquired P	1,000	$10.19	$10.19K	17,592	Direct
11 Jun, 2026	Charles W. Newton	Director	Disposed S	550	$10.04	$5.52K	12,665	Direct
04 Jun, 2026	Julius Knowles	Director	Disposed S	2,625	$10.73	$28.17K	10,958	Direct
04 Jun, 2026	Nima Farzan	Director	Disposed S	2,625	$10.73	$28.17K	9,767	Direct
04 Jun, 2026	Alpna Seth	Director	Disposed S	2,625	$10.72	$28.14K	9,767	Direct
03 Jun, 2026	Nima Farzan	Director	Acquired A	7,142	$0.00	$0	12,392	Direct
03 Jun, 2026	Mary Ann Gray	Director	Acquired A	7,142	$0.00	$0	12,392	Direct
03 Jun, 2026	Alpna Seth	Director	Acquired A	7,142	$0.00	$0	12,392	Direct
03 Jun, 2026	Julius Knowles	Director	Acquired A	7,142	$0.00	$0	13,583	Direct
03 Jun, 2026	Jean Jacques Bienaime	Director	Acquired A	7,142	$0.00	$0	16,592	Direct
03 Jun, 2026	Mary Ann Gray	Director	Acquired A	7,433	$0.00	$0	7,433	Direct
03 Jun, 2026	Jean Jacques Bienaime	Director	Acquired A	7,433	$0.00	$0	7,433	Direct

Showing 1 to 20 of 703 transactions