Keros Therapeutics, Inc. (KROS) Insider Trading
Over the last 3 months, KROS insiders made 3 open-market buys and 0 sales, a net purchase of $45K (SEC Form 4). Over the last 6 months, 97 institutions increased and 126 reduced their position (13F).
Insider Activity
Sentiment
100/100
Buys (3m)
3
Sells (3m)
0
Net (3m)
$44.7K
Insiders buying
Insider trades by month Buys Sells
Apr
Oct
Feb
Mar
Apr
May
Context3-month price -23.7%Institutions reducing (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| May 19, 2026 | BIENAIME JEAN JACQUESdirector | Buy | 1,000 | $10.58 |
| Apr 17, 2026 | BIENAIME JEAN JACQUESdirector | Buy | 1,000 | $11.70 |
| Apr 6, 2026 | Seehra Jasbirdirector, officer: CHIEF EXECUTIVE OFFICER | Option | 55,000 | $0.30 |
| Mar 27, 2026 | Cho Estherofficer: Chief Legal Officer | Grant | 80,000 | $15.52 |
| Mar 11, 2026 | BIENAIME JEAN JACQUESdirector | Buy | 2,000 | $11.21 |
| Mar 11, 2026 | Newton Charles W.director | Grant | 14,788 | $11.35 |
| Mar 11, 2026 | Newton Charles W.director | Grant | 13,215 | — |
| Feb 26, 2026 | Seehra Jasbirdirector, officer: CHIEF EXECUTIVE OFFICER | Grant | 217,000 | $15.52 |
| Feb 26, 2026 | Seehra Jasbirdirector, officer: CHIEF EXECUTIVE OFFICER | Grant | 100,000 | $15.52 |
| Feb 26, 2026 | Regnante Keithofficer: CHIEF FINANCIAL OFFICER | Grant | 60,000 | $15.52 |
| Feb 20, 2026 | Regnante Keithofficer: CHIEF FINANCIAL OFFICER | Sell | 4,739 | $16.35 |
| Feb 20, 2026 | Cho Estherofficer: SVP, General Counsel | Sell | 4,745 | $16.35 |
| Feb 20, 2026 | Lerner Lorena Raquelofficer: Chief Science Officer | Sell | 3,873 | $16.35 |
| Feb 20, 2026 | Seehra Jasbirdirector, officer: CHIEF EXECUTIVE OFFICER | Sell | 7,015 | $16.17 |
| Jan 9, 2026 | Seehra Jasbirdirector, officer: CHIEF EXECUTIVE OFFICER | Grant | 62,500 | $63.61 |
| Oct 17, 2025 | Pontifax Management 4 G.P. (2015) Ltd.10 percent owner | Sell | 155,262 | $17.75 |
| Oct 15, 2025 | ADAR1 Capital Management, LLC10 percent owner | Sell | 743,358 | $17.75 |
| Sep 5, 2025 | Seehra Jasbirdirector, officer: CHIEF EXECUTIVE OFFICER | Grant | 90,500 | — |
| Jun 6, 2025 | Farzan Nimadirector | Grant | 5,250 | — |
| Jun 6, 2025 | Farzan Nimadirector | Grant | 10,500 | $14.82 |
| Jun 6, 2025 | GRAY MARY ANNdirector | Grant | 10,500 | $14.82 |
| Jun 6, 2025 | Knowles Juliusdirector | Grant | 10,500 | $14.82 |
| Jun 6, 2025 | BIENAIME JEAN JACQUESdirector | Grant | 5,250 | — |
| Jun 6, 2025 | Kariv Tomerdirector, 10 percent owner: | Grant | 10,500 | $14.82 |
| Jun 6, 2025 | GRAY MARY ANNdirector | Grant | 5,250 | — |
| Jun 6, 2025 | GORDON CARL Ldirector | Grant | 5,250 | — |
| Jun 6, 2025 | Seth Alpnadirector | Grant | 5,250 | — |
| Jun 6, 2025 | GORDON CARL Ldirector | Grant | 10,500 | $14.82 |
| Jun 6, 2025 | Seth Alpnadirector | Grant | 10,500 | $14.82 |
| Jun 6, 2025 | Nussbaum Randirector, 10 percent owner: | Grant | 5,250 | — |
Source: KROS SEC Form 4 filings, latest May 19, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their KROS positions over the last 6 months (SEC Form 13F).
Increased
97
New positions
61
Reduced
126
Sold out
68
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| BLACKROCK, INC. | Increased | 2.4M | May 13, 2026 |
| BLACKROCK, INC. | Reduced | 2.3M | Feb 12, 2026 |
| VANGUARD GROUP INC | Reduced | 1.5M | Jan 29, 2026 |
| NANTAHALA CAPITAL MANAGEMENT, LLC | Increased | 1.4M | May 15, 2026 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Increased | 1.3M | Feb 13, 2026 |
| STATE STREET CORP | Reduced | 1.1M | Feb 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 831K | May 15, 2026 |
| MADISON AVENUE PARTNERS, LP | Reduced | 824K | Feb 17, 2026 |
| ORBIMED ADVISORS LLC | Reduced | 804K | Feb 17, 2026 |
| QUBE RESEARCH & TECHNOLOGIES LTD | Increased | 784K | Feb 17, 2026 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | Increased | 768K | Feb 13, 2026 |
| ORBIMED ADVISORS LLC | Reduced | 759K | May 15, 2026 |
| D. E. SHAW & CO., INC. | Reduced | 755K | Feb 17, 2026 |
| QUBE RESEARCH & TECHNOLOGIES LTD | Reduced | 725K | May 15, 2026 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | Reduced | 706K | May 15, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.