Fulcrum Therapeutics, Inc. (FULC) Ownership
FULC ownership summary
as of October 18, 2026- Institutions
- 102.2% of shares outstanding
- Insiders
- 3.35% of shares outstanding
- Shares outstanding
- 76.4M
- Float
- 63.5M shares available to trade
- Short interest
- 9.41% 7.1M shares short
- Days to cover
- 4.90 short interest down 1.2% vs prior month
- Institutions 102.19%
- Insiders 3.35%
FULC top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Nantahala Capital Management, LLC | 14.34% | 11.0M | $40.0M | +7.9M (+259.0%) | June 30, 2026 |
| 2 | BlackRock Inc | 11.55% | 8.8M | $32.2M | +3.4M (+63.7%) | June 30, 2026 |
| 3 | EcoR1 Capital, LLC | 8.58% | 6.5M | $23.9M | +6.5M (0.0%) | June 30, 2026 |
| 4 | TANG CAPITAL MANAGEMENT LLC | 8.54% | 6.5M | $23.8M | +6.5M (0.0%) | June 30, 2026 |
| 5 | Suvretta Capital Management, LLC | 4.82% | 3.7M | $13.4M | −2.9M (−43.9%) | June 30, 2026 |
| 6 | D. E. Shaw & Co LP | 3.99% | 3.0M | $11.1M | +1.4M (+87.5%) | June 30, 2026 |
| 7 | Citadel Advisors Llc | 3.54% | 2.7M | $9.9M | +1.4M (+109.2%) | June 30, 2026 |
| 8 | Vanguard Capital Management, LLC | 3.53% | 2.7M | $9.8M | +4,268 (+0.2%) | June 30, 2026 |
| 9 | Jane Street Group LLC | 2.90% | 2.2M | $8.1M | +1.9M (+614.4%) | June 30, 2026 |
| 10 | State Street Corp | 2.67% | 2.0M | $7.4M | +487,174 (+31.4%) | June 30, 2026 |
| 11 | Adage Capital Partners Gp LLC | 2.62% | 2.0M | $7.3M | +1.6M (+400.0%) | June 30, 2026 |
| 12 | GSK PLC | 2.34% | 1.8M | $6.5M | — | June 30, 2026 |
| 13 | Qube Research & Technologies | 2.29% | 1.7M | $6.4M | +773,728 (+79.4%) | June 30, 2026 |
| 14 | Assenagon Asset Management SA | 2.19% | 1.7M | $6.1M | +476,535 (+39.9%) | June 30, 2026 |
| 15 | Renaissance Technologies Corp | 2.16% | 1.6M | $6.0M | +1.6M (+12,016.2%) | June 30, 2026 |
| 16 | ADAR1 Capital Management LLC | 2.05% | 1.6M | $5.7M | +1.4M (+1,098.7%) | June 30, 2026 |
| 17 | Millennium Management LLC | 1.95% | 1.5M | $5.4M | +1.1M (+316.8%) | June 30, 2026 |
| 18 | Geode Capital Management, LLC | 1.88% | 1.4M | $5.2M | −54,409 (−3.7%) | June 30, 2026 |
| 19 | Marshall Wace Asset Management Ltd | 1.78% | 1.4M | $5.0M | +1.4M (0.0%) | June 30, 2026 |
| 20 | UBS Group AG | 1.64% | 1.3M | $4.6M | +938,724 (+297.8%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 17 holders added 39.0M shares and 2 cut 2.9M.
FULC top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.72% | 2.1M | $7.6M | — | August 31, 2026 |
| 2 | iShares Russell 2000 ETF | 2.29% | 1.7M | $6.4M | −20,160 (−1.1%) | September 30, 2026 |
| 3 | BlackRock Advantage Small Cap Core Instl | 2.00% | 1.5M | $5.6M | +101,537 (+7.1%) | August 31, 2026 |
| 4 | Fidelity Small Cap Index | 0.85% | 646K | $2.4M | +1,946 (+0.3%) | July 31, 2026 |
| 5 | iShares Russell 2000 Value ETF | 0.83% | 632K | $2.3M | +958 (+0.2%) | September 30, 2026 |
| 6 | iShares Biotechnology ETF | 0.75% | 576K | $2.1M | −4,368 (−0.8%) | September 30, 2026 |
| 7 | Fidelity Enhanced Small Cap Core ETF | 0.66% | 504K | $1.8M | +1,056 (+0.2%) | September 30, 2026 |
| 8 | Vanguard Russell 2000 ETF | 0.52% | 396K | $1.4M | +55,983 (+16.5%) | September 30, 2026 |
| 9 | Schwab US Small-Cap ETF™ | 0.43% | 326K | $1.2M | +216 (+0.1%) | September 30, 2026 |
| 10 | Strategic Advisers U.S. Total Stock | 0.38% | 293K | $1.1M | +75,292 (+34.6%) | August 31, 2026 |
| 11 | Fidelity Extended Market Index | 0.36% | 275K | $1.0M | +109,506 (+66.0%) | August 31, 2026 |
| 12 | Xtrackers S&P 500 2xLev Dly Swap ETF 1C | 0.33% | 250K | $913,562 | — | December 31, 2025 |
| 13 | iShares Micro-Cap ETF | 0.28% | 214K | $781,388 | −1,476 (−0.7%) | September 30, 2026 |
| 14 | BlackRock Advantage Small Cap Gr Instl | 0.25% | 194K | $708,991 | +35,569 (+22.4%) | August 31, 2026 |
| 15 | Vanguard Strategic Small-Cap Equity Inv | 0.25% | 191K | $697,592 | +191,121 (0.0%) | June 30, 2026 |
| 16 | BlackRock Advantage SMID Cap Instl | 0.25% | 189K | $690,682 | +52,358 (+38.3%) | August 31, 2026 |
| 17 | DFA US Micro Cap I | 0.23% | 176K | $643,254 | +7,630 (+4.5%) | August 31, 2026 |
| 18 | DFA US Small Cap I | 0.21% | 157K | $573,411 | — | August 31, 2026 |
| 19 | Simplify Health Care ETF | 0.20% | 153K | $559,508 | — | September 30, 2026 |
| 20 | Vanguard Health Care ETF | 0.19% | 142K | $519,289 | +156 (+0.1%) | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
FULC insider transactions
latest 4| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-01-02 | Robert J Gould | Sell | $11.87 | 15,000 | $178,050 |
| 2025-12-08 | Ra Capital Management, L.P. | Sell | $13.98 | 4,175,139 | $58.4M |
| 2025-11-19 | Robert J Gould | Sell | $11.03 | 15,000 | $165,450 |
| 2025-05-08 | Greg Tourangeau | Sell | $5.06 | 498 | $2,520 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
FULC shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns FULC
Institutional investors own 102.2% of Fulcrum Therapeutics's shares and insiders 3.35%. The largest holder is Nantahala Capital Management, LLC with 14.34% of the shares (11.0M), as of June 30, 2026. Among the top 20 institutions, 17 added shares and 2 reduced their stake in the latest filings. Short interest is 9.41% of the float, or 4.90 days of average trading volume. The share count rose 6,235.5% since 2017.
Related: FULC analyst forecast, FULC key metrics. See the FULC stock overview for the latest quote and news.
FULC ownership FAQ
Who owns the most Fulcrum Therapeutics stock?
The largest shareholders of Fulcrum Therapeutics are Nantahala Capital Management, LLC (14.34%), BlackRock Inc (11.55%), EcoR1 Capital, LLC (8.58%), TANG CAPITAL MANAGEMENT LLC (8.54%), Suvretta Capital Management, LLC (4.82%).
What percentage of Fulcrum Therapeutics is owned by institutions?
Institutions hold 102.2% of Fulcrum Therapeutics's shares outstanding; insiders hold 3.35%.
Which funds own Fulcrum Therapeutics?
The largest fund holders of Fulcrum Therapeutics are Vanguard MStar Total Stk Mkt Idx Invest (2.72%), iShares Russell 2000 ETF (2.29%), BlackRock Advantage Small Cap Core Instl (2.00%), Fidelity Small Cap Index (0.85%), iShares Russell 2000 Value ETF (0.83%).
What is Fulcrum Therapeutics's short interest?
7.1M shares of Fulcrum Therapeutics were sold short, 9.41% of the float; at the average daily volume it would take 4.90 days to cover.
Are insiders buying or selling Fulcrum Therapeutics?
Of the latest 4 reported insider transactions in Fulcrum Therapeutics (since May 8, 2025), 0 were purchases and 4 were sales.
How many shares of Fulcrum Therapeutics are outstanding?
Fulcrum Therapeutics has 76.4M shares outstanding, of which 63.5M are in the public float.