C4 Therapeutics Inc
Ownership
Ownership Structure
Who owns C4 Therapeutics Inc (CCCC)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 76.8% of the shares are freely tradable; institutional investors hold 85.1%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Morgan Stanley - Brokerage Accounts | 7.37 | 9,072,400 | +1.0 | 03/31/2026 |
| RA Capital Management, LLC | 6.50 | 8,000,000 | +0.0 | 03/31/2026 |
| Lynx1 Capital Management, LP | 5.96 | 7,326,691 | +4.7 | 06/30/2026 |
| Squadron Capital Management LLC | 5.85 | 7,200,000 | +220.0 | 06/30/2026 |
| Bain Capital Life Sciences Investors, LLC | 5.83 | 7,171,910 | +0.0 | 03/31/2026 |
| Citadel Advisors Llc | 3.40 | 4,187,580 | +66.8 | 06/30/2026 |
| Vanguard Capital Management, LLC | 3.14 | 3,861,852 | +0.0 | 03/31/2026 |
| Wasatch Advisors LP | 2.86 | 3,522,644 | +18.9 | 06/30/2026 |
| Two Sigma Investments LLC | 2.82 | 3,469,707 | +14.3 | 06/30/2026 |
| Soleus Capital Management, L.P. | 2.75 | 3,377,981 | -11.2 | 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 |
|---|---|---|---|---|---|
| Reyno Leonard | Chief Medical Officer | 372,406 | 1,266,180 $ | Jul 10, 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 |
|---|---|---|---|---|---|---|
| Jul 10, 2026 | Reyno Leonard | Chief Medical Officer | Other | 7,397 | 4.06 | 30,032 |
| Jul 10, 2026 | Reyno Leonard | Chief Medical Officer | Other | 15,325 | 0.00 | – |
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: September 17, 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.