Adicet Bio, Inc. (ACET) Ownership
ACET ownership summary
as of October 18, 2026- Institutions
- 64.7% of shares outstanding
- Insiders
- 1.08% of shares outstanding
- Shares outstanding
- 9.4M
- Float
- 7.4M shares available to trade
- Short interest
- 5.20% 485K shares short
- Days to cover
- 1.67 short interest up 78.5% vs prior month
- Institutions 64.70%
- Insiders 1.08%
- Other investors 34.22%
ACET top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | RA Capital Management, LLC | 9.96% | 933K | $4.3M | −250,000 (−21.1%) | June 30, 2026 |
| 2 | Orbimed Advisors LLC | 9.02% | 845K | $3.9M | −183,157 (−17.8%) | June 30, 2026 |
| 3 | Franklin Templeton Inc | 6.69% | 627K | $2.9M | — | June 30, 2026 |
| 4 | Citadel Advisors Llc | 4.62% | 433K | $2.0M | +50,915 (+13.3%) | June 30, 2026 |
| 5 | Vanguard Capital Management, LLC | 3.67% | 343K | $1.6M | +6,704 (+2.0%) | June 30, 2026 |
| 6 | Adage Capital Partners Gp LLC | 2.93% | 274K | $1.3M | — | June 30, 2026 |
| 7 | Renaissance Technologies Corp | 2.84% | 266K | $1.2M | +33,354 (+14.3%) | June 30, 2026 |
| 8 | Stonepine Capital Management Llc | 2.62% | 246K | $1.1M | +23,563 (+10.6%) | June 30, 2026 |
| 9 | Alyeska Investment Group, L.P. | 2.18% | 204K | $931,361 | — | June 30, 2026 |
| 10 | Schonfeld Strategic Advisors LLC | 2.09% | 196K | $893,499 | +195,514 (0.0%) | June 30, 2026 |
| 11 | The Carlyle Group Inc | 1.97% | 184K | $842,228 | — | June 30, 2026 |
| 12 | NEXTBio Capital Management LP | 1.69% | 158K | $721,269 | — | June 30, 2026 |
| 13 | Acadian Asset Management LLC | 1.33% | 125K | $570,482 | +6,694 (+5.7%) | June 30, 2026 |
| 14 | Two Sigma Investments LLC | 1.03% | 97K | $442,554 | +53,733 (+124.7%) | June 30, 2026 |
| 15 | Geode Capital Management, LLC | 1.02% | 96K | $437,047 | −5,501 (−5.4%) | June 30, 2026 |
| 16 | Dafna Capital Management LLC | 1.00% | 94K | $428,721 | — | June 30, 2026 |
| 17 | Bridgeway Capital Management, LLC | 0.92% | 86K | $392,833 | +85,959 (0.0%) | June 30, 2026 |
| 18 | Marshall Wace Asset Management Ltd | 0.85% | 79K | $363,260 | +79,488 (0.0%) | June 30, 2026 |
| 19 | Trexquant Investment LP | 0.83% | 78K | $356,469 | +34,336 (+78.6%) | June 30, 2026 |
| 20 | Jane Street Group LLC | 0.75% | 71K | $322,464 | +33,477 (+90.3%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 11 holders added 604K shares and 3 cut 439K.
ACET top mutual fund and ETF holders
16 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Franklin Biotechnology Discv A(acc)USD | 5.33% | 499K | $2.3M | +97,567 (+24.3%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 2.60% | 243K | $1.1M | — | August 31, 2026 |
| 3 | Franklin Biotechnology Discovery A | 2.41% | 225K | $1.0M | — | August 31, 2026 |
| 4 | Bridgeway Ultra-Small Company | 0.92% | 86K | $392,833 | +85,959 (0.0%) | June 30, 2026 |
| 5 | Fidelity Extended Market Index | 0.50% | 47K | $213,063 | +4,511 (+10.7%) | August 31, 2026 |
| 6 | iShares Micro-Cap ETF | 0.24% | 23K | $104,370 | −158 (−0.7%) | September 30, 2026 |
| 7 | Fidelity Total Market Index | 0.19% | 17K | $79,285 | — | August 31, 2026 |
| 8 | Dimensional US Small Cap ETF | 0.17% | 16K | $73,490 | — | September 30, 2026 |
| 9 | DFA US Micro Cap I | 0.17% | 16K | $72,700 | +1,644 (+11.5%) | August 31, 2026 |
| 10 | Fidelity Series Total Market Index | 0.13% | 12K | $56,490 | — | August 31, 2026 |
| 11 | Avantis US Small Cap Equity ETF | 0.07% | 6,598 | $30,153 | — | September 30, 2026 |
| 12 | Vanguard U.S. Eq Idx £ Acc | 0.06% | 5,221 | $23,860 | — | August 31, 2026 |
| 13 | 1290 VT Micro Cap K | 0.02% | 1,601 | $7,317 | — | August 31, 2026 |
| 14 | Vanguard Balanced Index Inv | 0.01% | 786 | $3,592 | — | August 31, 2026 |
| 15 | Dimensional Global Core Equity USD Acc | <0.01% | 419 | $1,915 | — | August 31, 2026 |
| 16 | Dimensional World Equity GBP Acc | <0.01% | 297 | $1,357 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ACET insider transactions
latest 3| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-02-20 | Ra Capital Management, L.P. | Buy | $7.27 | 74,751 | $543,440 |
| 2026-02-19 | Ra Capital Management, L.P. | Buy | $7.21 | 74,268 | $535,472 |
| 2026-02-18 | Ra Capital Management, L.P. | Buy | $7.04 | 74,577 | $525,022 |
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.
ACET shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ACET
Institutional investors own 64.7% of Adicet Bio's shares and insiders 1.08%. The largest holder is RA Capital Management, LLC with 9.96% of the shares (933K), as of June 30, 2026. Among the top 20 institutions, 11 added shares and 3 reduced their stake in the latest filings. Short interest is 5.20% of the float, or 1.67 days of average trading volume. The share count rose 331.7% since 2014.
Related: ACET analyst forecast, ACET key metrics. See the ACET stock overview for the latest quote and news.
ACET ownership FAQ
Who owns the most Adicet Bio stock?
The largest shareholders of Adicet Bio are RA Capital Management, LLC (9.96%), Orbimed Advisors LLC (9.02%), Franklin Templeton Inc (6.69%), Citadel Advisors Llc (4.62%), Vanguard Capital Management, LLC (3.67%).
What percentage of Adicet Bio is owned by institutions?
Institutions hold 64.7% of Adicet Bio's shares outstanding; insiders hold 1.08%.
Which funds own Adicet Bio?
The largest fund holders of Adicet Bio are Franklin Biotechnology Discv A(acc)USD (5.33%), Vanguard MStar Total Stk Mkt Idx Invest (2.60%), Franklin Biotechnology Discovery A (2.41%), Bridgeway Ultra-Small Company (0.92%), Fidelity Extended Market Index (0.50%).
What is Adicet Bio's short interest?
485K shares of Adicet Bio were sold short, 5.20% of the float; at the average daily volume it would take 1.67 days to cover.
Are insiders buying or selling Adicet Bio?
Of the latest 3 reported insider transactions in Adicet Bio (since February 18, 2026), 3 were purchases and 0 were sales.
How many shares of Adicet Bio are outstanding?
Adicet Bio has 9.4M shares outstanding, of which 7.4M are in the public float.