FibroBiologics, Inc. Common Stock
FibroBiologics, Inc. Common Stock (FBLG) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · FBLG · as of Sep 30, 2025
Ownership Breakdown
53
Institutional Holders
▼ 6 vs Q2
$3.25M
Total Inst. Value
▼ $498,930 vs Q2
2.10M
Shares Outstanding
freeFloat 76.49%
5.35M
13F Shares Held
▼ 619,007 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
FBLG largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC pharmaceutical preparations | 1.23M | 2.86% | 2.86% | $673.64M | Nov 7, 2025 | — held |
YORKVILLE ADVISORS GLOBAL, LP pharmaceutical preparations | 509.8K | 1.18% | 1.18% | $278.45M | Nov 18, 2025 | ▼ 334.3K |
MILLENNIUM MANAGEMENT LLC pharmaceutical preparations | 446.2K | 1.04% | 1.04% | $243.72M | Nov 14, 2025 | ▼ 34.4K |
BLACKROCK, INC. pharmaceutical preparations | 439.8K | 1.02% | 1.02% | $240.20M | Nov 12, 2025 | ▼ 311.1K |
LANDSCAPE CAPITAL MANAGEMENT, L.L.C. pharmaceutical preparations | 350.0K | 81.26% | 81.26% | $191.17M | Nov 13, 2025 | NEW |
GTS SECURITIES LLC pharmaceutical preparations | 308.7K | 71.66% | 71.66% | $168.53M | Nov 14, 2025 | NEW |
CASCADE FINANCIAL PARTNERS, LLC pharmaceutical preparations | 298.1K | 69.20% | 69.20% | $162.81M | Oct 21, 2025 | ▲ 7.5K |
GEODE CAPITAL MANAGEMENT, LLC pharmaceutical preparations | 288.9K | 67.08% | 67.08% | $157.91M | Nov 12, 2025 | — held |
CITADEL ADVISORS LLC pharmaceutical preparations | 211.1K | 49.02% | 49.02% | $115.32M | Nov 14, 2025 | ▼ 22.2K |
CERITY PARTNERS LLC pharmaceutical preparations | 125.9K | 29.23% | 29.23% | $68.78M | Oct 22, 2025 | ▼ 2.2K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
8
Increased
+54.1K shares8
New Positions
first time holders19
Decreased
−907.9K shares0
Sold Out
fully exitedNet shares change (top 50)
853.8K
+54.1K / −907.9K
Net new holders
-3
8 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
FBLG insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
4
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
O'HEERON PETE CHIEF EXECUTIVE OFFICER | May 4, 2026 | Award | 92,410 | $1.38 | $127.5K | 92.4K | Form 4 ↗ |
Khoja Hamid Chief Scientific Officer | May 4, 2026 | Award | 61,607 | $1.38 | $85.0K | 61.6K | Form 4 ↗ |
Davis Jason Chief Financial Officer | May 4, 2026 | Award | 61,607 | $1.38 | $85.0K | 61.6K | Form 4 ↗ |
GARCIA RUBEN A General Counsel | May 4, 2026 | Award | 61,607 | $1.38 | $85.0K | 61.6K | Form 4 ↗ |
Khoja Hamid Chief Scientific Officer | Mar 4, 2026 | Purchase | 30,000 | $0.38 | $11.4K | 61.3K | Form 4 ↗ |
O'HEERON PETE CHIEF EXECUTIVE OFFICER | Mar 4, 2026 | Purchase | 15,872 | $0.38 | $6.0K | 5.96M | Form 4 ↗ |
O'HEERON PETE CHIEF EXECUTIVE OFFICER | Mar 3, 2026 | Purchase | 18,200 | $0.41 | $7.4K | 5.94M | Form 4 ↗ |
O'HEERON PETE CHIEF EXECUTIVE OFFICER | Mar 2, 2026 | Purchase | 17,428 | $0.35 | $6.2K | 5.92M | Form 4 ↗ |
Davis Jason Chief Financial Officer | Mar 2, 2026 | Purchase | 70,000 | $0.41 | $29.0K | 70.0K | Form 4 ↗ |
GARCIA RUBEN A General Counsel | Feb 27, 2026 | Purchase | 40,000 | $0.33 | $13.1K | 180.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
FibroBiologics, Inc. Common Stock (FBLG) is primarily owned by institutional investors, who hold approximately 100.0% of total shares outstanding. Company insiders own approximately 23.51%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of FibroBiologics, Inc. Common Stock is VANGUARD GROUP INC, holding approximately 1.23 million shares — equal to 2.86% of outstanding shares — as of September 30, 2025.
A total of 53 institutional investors currently hold FBLG stock, with a combined institutional value of approximately $3,254,566 as of the most recent 13F filing period.
Frequently asked questions
FBLG ownershipFibroBiologics, Inc. Common Stock (FBLG) is primarily owned by institutional investors, who hold approximately 100.0% of shares. The largest shareholder is VANGUARD GROUP INC with a 2.86% stake. Company insiders hold 23.51%. Data sourced from SEC Form 13F as of September 30, 2025.