Compass Therapeutics Inc.
Ownership
Ownership Structure
Who owns Compass Therapeutics Inc. (CMPX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 73.5% of the shares are freely tradable; institutional investors hold 94.2%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| TANG CAPITAL MANAGEMENT LLC | 9.99 | 17,990,782 | +7.1 | 06/30/2026 |
| Orbimed Advisors LLC | 8.45 | 15,219,994 | +0.0 | 06/30/2026 |
| Suvretta Capital Management, LLC | 7.83 | 14,101,159 | -1.4 | 06/30/2026 |
| BlackRock Inc | 6.26 | 11,281,781 | +18.7 | 06/30/2026 |
| State Street Corp | 5.53 | 9,953,653 | +48.7 | 06/30/2026 |
| Enavate Sciences GP, LLC | 4.32 | 7,788,150 | +0.0 | 06/30/2026 |
| Vivo Capital, LLC | 4.31 | 7,757,060 | -18.7 | 06/30/2026 |
| Vanguard Capital Management, LLC | 3.40 | 6,118,782 | +1.4 | 06/30/2026 |
| Palo Alto Investors, LLC | 3.24 | 5,831,813 | +285.1 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| State Street® SPDR® S&P® Biotech ETF | 2.69 | 4,839,420 | -1.9 | 09/30/2026 |
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 |
|---|---|---|---|---|---|
| Lerner Neil | Chief Accounting Officer | 420,000 | 322,434 $ | Oct 1, 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 |
|---|---|---|---|---|---|---|
| Oct 1, 2026 | Lerner Neil | Chief Accounting Officer | Buy | 20,000 | 0.92 | 18,400 |
| Sep 24, 2026 | Lerner Neil | Chief Accounting Officer | Buy | 2,500 | 1.14 | 2,850 |
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 2, 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.