FibroBiologics, Inc.
Ownership
Ownership Structure
Who owns FibroBiologics, Inc. (FBLG)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 86.3% of the shares are freely tradable; institutional investors hold 12.5%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Capital Management, LLC | 1.02 | 67,665 | +0.0 | 03/31/2026 |
| Fund Evaluation Group, LLC | 0.78 | 51,794 | +0.0 | 06/30/2026 |
| Geode Capital Management, LLC | 0.44 | 29,609 | -91.5 | 03/31/2026 |
| BlackRock Inc | 0.37 | 24,647 | -94.9 | 03/31/2026 |
| Renaissance Technologies Corp | 0.24 | 15,997 | -93.1 | 03/31/2026 |
| Vanguard Fiduciary Trust Co | 0.10 | 6,380 | +0.0 | 03/31/2026 |
| UBS Group AG | 0.09 | 5,721 | -95.3 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Institutional Extnd Mkt Idx Tr | 0.42 | 27,769 | +0.0 | 07/31/2026 |
| Fidelity Extended Market Index | 0.37 | 24,379 | +0.0 | 07/31/2026 |
| Extended Equity Market Fund E | 0.04 | 57,997 | +0.0 | 12/31/2025 |
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 |
|---|---|---|---|---|---|
| Khoja Hamid | Chief Scientific Officer | 301,571 | 452,357 $ | Sep 15, 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 |
|---|---|---|---|---|---|---|
| Sep 15, 2026 | Khoja Hamid | Chief Scientific Officer | Other | 298,508 | 1.68 | 500,001 |
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.