Adicet Bio, Inc. (ACET) — Institutional Holders, Q2 2026
56 institutional investment managers reported a ACET position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $52.8M. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
ACET in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- Schonfeld Strategic AdvisorsNew · +195,514 sh+$1.7M
- BRIDGEWAY CAPITAL MANAGEMENTNew · +85,959 sh+$742.7K
- MARSHALL WACE, LLPNew · +79,488 sh+$686.8K
- REGENERON PHARMACEUTICALSNew · +60,511 sh+$522.8K
- TWO SIGMA INVESTMENTSAdded · +53,733 sh+$464.3K
Biggest sellers
- Woodline PartnersSold out · -313,124 sh-$2.7M
- Prosight ManagementSold out · -250,244 sh-$2.2M
- RA CAPITAL MANAGEMENT, L.P.Trimmed · -250,000 sh-$2.2M
- ORBIMED ADVISORSTrimmed · -183,157 sh-$1.6M
- ADAR1 Capital ManagementSold out · -53,827 sh-$465.1K
ACET 13F holders ranked 1–56 of 56
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | RA CAPITAL MANAGEMENT, L.P.#1 · 932,624 sh | 932,624 | $8.1M | 0.07% | -21.1% |
| 2 | ORBIMED ADVISORS#2 · 844,787 sh | 844,787 | $7.3M | 0.14% | -17.8% |
| 3 | FRANKLIN RESOURCES#3 · 626,571 sh | 626,571 | $5.4M | <0.01% | 0.0% |
| 4 | CITADEL ADVISORS#4 · 432,738 sh | 432,738 | $3.7M | <0.01% | +13.3% |
| 5 | VANGUARD CAPITAL MANAGEMENT#5 · 343,228 sh | 343,228 | $3.0M | <0.01% | +2.0% |
| 6 | ADAGE CAPITAL PARTNERS GP, L.L.C.#6 · 274,375 sh | 274,375 | $2.4M | <0.01% | 0.0% |
| 7 | RENAISSANCE TECHNOLOGIES#7 · 265,945 sh | 265,945 | $2.3M | <0.01% | +14.3% |
| 8 | Stonepine Capital Management#8 · 245,518 sh | 245,518 | $2.1M | 0.99% | +10.6% |
| 9 | Alyeska Investment Group, L.P.#9 · 203,799 sh | 203,799 | $1.8M | <0.01% | 0.0% |
| 10 | Schonfeld Strategic Advisors#10 · 195,514 sh | 195,514 | $1.7M | <0.01% | New |
| 11 | Carlyle Group#11 · 184,295 sh | 184,295 | $1.6M | 0.02% | 0.0% |
| 12 | NEXTBio Capital Management#12 · 157,827 sh | 157,827 | $1.4M | 0.63% | 0.0% |
| 13 | ACADIAN ASSET MANAGEMENT#13 · 124,832 sh | 124,832 | $1.1M | <0.01% | +5.7% |
| 14 | TWO SIGMA INVESTMENTS#14 · 96,839 sh | 96,839 | $836.7K | <0.01% | +124.7% |
| 15 | GEODE CAPITAL MANAGEMENT#15 · 95,634 sh | 95,634 | $826.7K | 0.00% | -5.4% |
| 16 | DAFNA Capital Management#16 · 93,812 sh | 93,812 | $810.5K | 0.15% | 0.0% |
| 17 | BRIDGEWAY CAPITAL MANAGEMENT#17 · 85,959 sh | 85,959 | $742.7K | 0.01% | New |
| 18 | MARSHALL WACE, LLP#18 · 79,488 sh | 79,488 | $686.8K | <0.01% | New |
| 19 | Trexquant Investment#19 · 78,002 sh | 78,002 | $673.9K | <0.01% | +78.6% |
| 20 | JANE STREET GROUP#20 · 70,561 sh | 70,561 | $609.6K | <0.01% | +90.3% |
| 21 | Burkehill Global Management#21 · 62,500 sh | 62,500 | $540.0K | 0.02% | 0.0% |
| 22 | BlackRock#22 · 62,126 sh | 62,126 | $536.8K | 0.00% | +69.8% |
| 23 | REGENERON PHARMACEUTICALS#23 · 60,511 sh | 60,511 | $522.8K | 0.29% | 0.0% |
| 24 | Rangeley Capital#24 · 50,892 sh | 50,892 | $439.7K | 0.40% | -9.1% |
| 25 | VANGUARD FIDUCIARY#25 · 50,670 sh | 50,670 | $437.8K | <0.01% | +0.7% |
| 26 | RBF Capital#26 · 38,582 sh | 38,582 | $333.3K | 0.01% | 0.0% |
| 27 | STATE STREET#27 · 36,222 sh | 36,222 | $313.0K | 0.00% | 0.0% |
| 28 | Quadrature Capital Ltd#28 · 36,193 sh | 36,193 | $312.7K | <0.01% | New |
| 29 | DIMENSIONAL FUND ADVISORS#29 · 31,603 sh | 31,603 | $273.0K | 0.00% | +193.2% |
| 30 | UBS Group AG#30 · 29,817 sh | 29,817 | $257.6K | 0.00% | -22.3% |
| 31 | Verdad Advisers#31 · 25,200 sh | 25,200 | $217.7K | 0.21% | New |
| 32 | XTX Topco Ltd#32 · 24,284 sh | 24,284 | $209.8K | <0.01% | +27.0% |
| 33 | JOHNSON & JOHNSON#33 · 22,779 sh | 22,779 | $196.8K | — | 0.0% |
| 34 | SUSQUEHANNA INTERNATIONAL GROUP, LLP#34 · 20,650 sh | 20,650 | $178.4K | 0.00% | New |
| 35 | PRELUDE CAPITAL MANAGEMENT#35 · 18,550 sh | 18,550 | $160.3K | 0.01% | New |
| 36 | NORTHERN#36 · 18,436 sh | 18,436 | $159.3K | 0.00% | -4.0% |
| 37 | OCCUDO QUANTITATIVE STRATEGIES#37 · 16,636 sh | 16,636 | $143.7K | <0.01% | +10.2% |
| 38 | Squarepoint Ops#38 · 15,254 sh | 15,254 | $131.8K | <0.01% | New |
| 39 | Vontobel Holding Ltd.#39 · 13,776 sh | 13,776 | $119.0K | — | -3.3% |
| 40 | AXQ CAPITAL#40 · 10,991 sh | 10,991 | $95.0K | 0.01% | New |
| 41 | Jump Financial#41 · 10,942 sh | 10,942 | $94.5K | <0.01% | New |
| 42 | SRS Capital Advisors#42 · 6,000 sh | 6,000 | $51.8K | <0.01% | New |
| 43 | Vanguard Global Advisers#43 · 5,221 sh | 5,221 | $45.1K | 0.00% | 0.0% |
| 44 | SIMPLEX TRADING#44 · 4,814 sh | 4,814 | $41.6K | 0.00% | +245.6% |
| 45 | MORGAN STANLEY#45 · 2,291 sh | 2,291 | $19.8K | 0.00% | -34.4% |
| 46 | ROYAL BANK OF CANADA#46 · 1,701 sh | 1,701 | $15.0K | 0.00% | +0.1% |
| 47 | Tower Research Capital (TRC)#47 · 277 sh | 277 | $2.4K | <0.01% | -80.5% |
| 48 | Avion Wealth#48 · 246 sh | 246 | $2.0K | <0.01% | 0.0% |
| 49 | JPMORGAN CHASE#49 · 196 sh | 196 | $1.7K | 0.00% | +2350.0% |
| 50 | BNP PARIBAS FINANCIAL MARKETS#50 · 50 sh | 50 | $432.00 | 0.00% | 0.0% |
| 51 | Caitong International Asset Management , Ltd#51 · 47 sh | 47 | $406.00 | <0.01% | +1466.7% |
| 52 | SBI Securities , Ltd.#52 · 24 sh | 24 | $207.00 | — | +26.3% |
| 53 | NATIONAL BANK OF CANADA#53 · 17 sh | 17 | $146.00 | 0.00% | 0.0% |
| 54 | FMR#54 · 6 sh | 6 | $52.00 | 0.00% | New |
| 55 | TD Waterhouse Canada#55 · 3 sh | 3 | $26.00 | — | New |
| 56 | DANSKE BANK A/S#56 · 1 sh | 1 | $9.00 | 0.00% | 0.0% |
Funds that sold out of ACET in Q2 2026 (5)
Held ACET at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| Woodline Partners313,124 sh | 313,124 | $2.1M |
| Prosight Management250,244 sh | 250,244 | $1.7M |
| ADAR1 Capital Management53,827 sh | 53,827 | $366.6K |
| BARCLAYS PLC25,000 sh | 25,000 | $170.3K |
| FNY Investment Advisers3,200 sh | 3,200 | $21.0K |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.