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  • FBLG FibroBiologics, Inc.

FBLG

FibroBiologics, Inc.

Company with tickers: FBLG

CIK
1958777
CUSIP
31573L105
Shares Outstanding
5,208,915
Holders: 46
Total Value: $19,880,709
Total Shares: 4,417,937

Institutional Ownership Trend

8 quarters

Holder Concentration

Across 46 13F filers · Δ vs Sep 30, 2025
Top Holder
27.5%
Mar 2024 → Dec 2025 · range 20.2% – 40.4%
+4.7 pts
Top 5
60.0%
Mar 2024 → Dec 2025 · range 55.2% – 72.2%
+4.8 pts
Top 10
77.0%
Mar 2024 → Dec 2025 · range 75.1% – 89.0%
−1.1 pts
HHI
1,130
Mar 2024 → Dec 2025 · range 930 – 1,991
Broadly held +200

Quarterly Activity

vs Sep 30, 2025
New
6
Increased
8
Decreased
7
Sold Out
15
Unchanged
25
Holder count: -9
Institutional value: -66.2%
Shares held: -18.1%

Top Buyers

vs Sep 30, 2025
Institution Added Now Holds Open
Large RENAISSANCE TECHNOLOGIES LLC +171,800 231,600
Mega GEODE CAPITAL MANAGEMENT, LLC +59,813 348,761
Mega UBS Group AG +43,336 120,770
Mega BlackRock, Inc. +42,628 482,401
Small Cascade Financial Partners, LLC +16,500 314,581

Top Sellers

vs Sep 30, 2025
Institution Sold Now Holds Open
Mega MILLENNIUM MANAGEMENT LLC −157,712 288,496
Large Cerity Partners LLC −32,000 93,919
Mega VANGUARD GROUP INC −17,440 1,216,341
Large Qube Research & Technologies Ltd −13,130 16,836
Large OSAIC HOLDINGS, INC. −2,000 6,000

Top New Positions

vs Sep 30, 2025
Institution Acquired Value (USD) Open
Mega JANE STREET GROUP, LLC 149,763 $673,933
Mid AMG National Trust Bank 138,960 $625,320
Mid XTX Topco Ltd 37,919 $170,635
Mid DRW Securities, LLC 33,348 $150,066
Large Point72 Asset Management, L.P. 14,476 $65,142

Top Sold-Out Positions

vs Sep 30, 2025
Institution Previously Held Last Value (USD) Open
Small Yorkville Advisors Global, LP 509,787 $5,566,874
Mid LANDSCAPE CAPITAL MANAGEMENT, L.L.C. 350,000 $3,821,999
Mid GTS SECURITIES LLC 308,661 $3,370,578
Mega CITADEL ADVISORS LLC 211,139 $2,305,637
Large HRT FINANCIAL LP 44,145 $482,063
Filter: New 6 Increased 8 Reduced 7 Sold out 15 Unchanged 25
46 of 46 shown
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega VANGUARD GROUP INC $5,473,534 27.53% 1,216,341
Mega BlackRock, Inc. $2,170,804 10.92% 482,401
Mega GEODE CAPITAL MANAGEMENT, LLC $1,569,424 7.89% 348,761
Small Cascade Financial Partners, LLC $1,415,614 7.12% 314,581
Mega MILLENNIUM MANAGEMENT LLC $1,298,232 6.53% 288,496
Large RENAISSANCE TECHNOLOGIES LLC $1,042,200 5.24% 231,600
Mega JANE STREET GROUP, LLC $673,933 3.39% 149,763
Mid AMG National Trust Bank Bank $625,320 3.15% 138,960
Mega UBS Group AG $543,465 2.73% 120,770
Mega STATE STREET CORP $500,850 2.52% 111,300
Micro Optivise Advisory Services LLC $495,450 2.49% 110,100
Small Requisite Capital Management, LLC $493,708 2.48% 109,713
Large &PARTNERS $450,000 2.26% 100,000
Large Cerity Partners LLC $422,635 2.13% 93,919
Micro American Institute for Advanced Investment Management, LLP $396,927 2.00% 88,206
Small SAXON INTERESTS, INC. $256,500 1.29% 57,000
Mega BANK OF AMERICA CORP /DE/ Bank $216,791 1.09% 48,176
Mega NORTHERN TRUST CORP Bank $214,533 1.08% 47,674
Small RMR Wealth Builders $172,620 0.87% 38,360
Mid XTX Topco Ltd $170,635 0.86% 37,919
Mid Concurrent Investment Advisors, LLC $158,773 0.80% 35,283
Mid DRW Securities, LLC Broker-Dealer $150,066 0.75% 33,348
Small Ethos Financial Group, LLC $109,908 0.55% 24,424
Mega RAYMOND JAMES FINANCIAL INC $83,889 0.42% 18,642
Mid Tower Research Capital LLC (TRC) $81,490 0.41% 18,109
Large Cetera Investment Advisers $81,027 0.41% 18,006
Mid NewEdge Advisors, LLC $76,077 0.38% 16,906
Large Qube Research & Technologies Ltd $75,762 0.38% 16,836
Small CAHABA WEALTH MANAGEMENT, INC. $66,159 0.33% 14,702
Micro Flaharty Asset Management, LLC $66,159 0.33% 14,702
Large Point72 Asset Management, L.P. $65,142 0.33% 14,476
Mid Brooklyn Investment Group $51,750 0.26% 11,500
Mega GOLDMAN SACHS GROUP INC $47,106 0.24% 10,468
Small Global Assets Advisory, LLC $47,025 0.24% 10,450
Mid CWA Asset Management Group, LLC $45,000 0.23% 10,000
Large OSAIC HOLDINGS, INC. $27,000 0.14% 6,000
Micro ISLAY CAPITAL MANAGEMENT, LLC $15,259 0.08% 3,391
Small Grove Bank & Trust Bank $9,000 0.05% 2,000
Mega ROYAL BANK OF CANADA Bank $8,289 0.04% 1,842
Mega BNP PARIBAS ARBITRAGE, SA $5,877 0.03% 1,306
Micro Disciplined Equity Management, Inc. $4,500 0.02% 1,000
Mid Allworth Financial LP $1,174 0.01% 261
Mega WELLS FARGO & COMPANY/MN $900 0.00% 200
Mid Optiver Holding B.V. $117 0.00% 26
Mega DEUTSCHE BANK AG\ Bank $81 0.00% 18
Mega BARCLAYS PLC $4 0.00% 1

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