Keros Therapeutics Inc
Ownership
Ownership Structure
Who owns Keros Therapeutics Inc (KROS)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 89.6% of the shares are freely tradable; institutional investors hold 96.2%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Nantahala Capital Management, LLC | 14.23 | 2,820,838 | +107.4 | 06/30/2026 |
| BlackRock Inc | 14.09 | 2,794,217 | +15.9 | 06/30/2026 |
| AQR Capital Management LLC | 4.88 | 967,859 | +138.1 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.20 | 833,596 | +0.3 | 06/30/2026 |
| Orbimed Advisors LLC | 3.83 | 759,155 | +0.0 | 06/30/2026 |
| Federated Hermes Inc | 3.53 | 700,427 | +1.6 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 3.29 | 652,635 | -4.3 | 06/30/2026 |
| Mackenzie Investments | 3.17 | 628,438 | +312.2 | 06/30/2026 |
| Madison Avenue Partners, LP | 3.16 | 626,583 | +0.0 | 06/30/2026 |
| Qube Research & Technologies | 3.07 | 608,837 | -16.0 | 06/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Tanini Annita | Corp. Controller & VP, Finance | 45,144 | 487,555 $ | Aug 18, 2026 | direct |
| Cho Esther | Chief Legal Officer | 35,770 | 386,316 $ | Aug 18, 2026 | direct |
| Lerner Lorena Raquel | Chief Scientific Officer | 27,559 | 297,637 $ | Aug 18, 2026 | direct |
| Bienaime Jean Jacques | Director | 19,592 | 211,594 $ | Aug 17, 2026 | direct |
| Newton Charles W. | Director | 12,114 | 130,831 $ | Aug 18, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 18, 2026 | Tanini Annita | Corp. Controller & VP, Finance | Sell | 1,224 | 10.29 | 12,595 |
| Aug 18, 2026 | Cho Esther | Chief Legal Officer | Sell | 4,485 | 10.29 | 46,151 |
| Aug 18, 2026 | Lerner Lorena Raquel | Chief Scientific Officer | Sell | 3,568 | 10.29 | 36,715 |
| Aug 18, 2026 | Newton Charles W. | Director | Sell | 551 | 10.30 | 5,675 |
| Aug 17, 2026 | Bienaime Jean Jacques | Director | Buy | 1,000 | 10.27 | 10,270 |
| Jul 15, 2026 | Bienaime Jean Jacques | Director | Buy | 1,000 | 10.61 | 10,610 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 3, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.