Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in ACET held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | RA CAPITAL MANAGEMENT, L.P. | 933K | $8.1M | -21.1% | 9.977% | 0.07% |
| 2 | ORBIMED ADVISORS LLC | 845K | $7.3M | -17.8% | 9.037% | 0.14% |
| 3 | FRANKLIN RESOURCES INC | 627K | $5.4M | 0.0% | 6.703% | 0.00% |
| 4 | CITADEL ADVISORS LLC | 466K | $4.0M | +22.1% | 4.988% | 0.00% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 343K | $3.0M | +2.0% | 3.672% | 0.00% |
| 6 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 274K | $2.4M | 0.0% | 2.935% | 0.00% |
| 7 | RENAISSANCE TECHNOLOGIES LLC | 266K | $2.3M | +14.3% | 2.845% | 0.00% |
| 8 | Stonepine Capital Management, LLC | 246K | $2.1M | +10.6% | 2.626% | 0.54% |
| 9 | Alyeska Investment Group, L.P. | 204K | $1.8M | 0.0% | 2.180% | 0.00% |
| 10 | Schonfeld Strategic Advisors LLC | 196K | $1.7M | — | 2.091% | 0.01% |
| 11 | Carlyle Group Inc. | 184K | $1.6M | 0.0% | 1.971% | 0.02% |
| 12 | NEXTBio Capital Management LP | 158K | $1.4M | 0.0% | 1.688% | 0.63% |
| 13 | TWO SIGMA INVESTMENTS, LP | 97K | $837K | +124.6% | 1.036% | 0.00% |
| 14 | GEODE CAPITAL MANAGEMENT, LLC | 96K | $827K | -5.4% | 1.023% | 0.00% |
| 15 | DAFNA Capital Management LLC | 94K | $811K | 0.0% | 1.004% | 0.15% |
| 16 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 86K | $743K | — | 0.919% | 0.01% |
| 17 | MARSHALL WACE, LLP | 79K | $687K | — | 0.850% | 0.00% |
| 18 | Trexquant Investment LP | 78K | $674K | +78.6% | 0.834% | 0.00% |
| 19 | JANE STREET GROUP, LLC | 71K | $610K | +90.3% | 0.755% | 0.00% |
| 20 | Burkehill Global Management, LP | 63K | $540K | 0.0% | 0.669% | 0.02% |
| 21 | BlackRock, Inc. | 62K | $537K | +69.8% | 0.665% | 0.00% |
| 22 | REGENERON PHARMACEUTICALS, INC. | 61K | $523K | 0.0% | 0.647% | 0.30% |
| 23 | Rangeley Capital, LLC | 51K | $440K | -9.1% | 0.544% | 0.40% |
| 24 | VANGUARD FIDUCIARY TRUST CO | 51K | $438K | +0.7% | 0.542% | 0.00% |
| 25 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 40K | $348K | -23.9% | 0.431% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in ACET — a direct measure of their conviction.
Filings activity in ACET during Q2 2026, grouped by how each filer changed its position.
Institutions that opened a new ACET position in Q2 2026
Institutions that fully closed their ACET position in Q2 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 56 | +9.8% | 65.93% | 2.20 pp | $52M | +21% |
| Q1 2026 | 51 | +4.1% | 68.13% | 1.98 pp | $43M | 21% |
| Q4 2025 | 49 | 7.5% | 70.11% | +16.26 pp | $55M | +38% |
| Q3 2025 | 53 | +8.2% | 53.85% | 0.44 pp | $40M | +32% |
| Q2 2025 | 49 | 13% | 54.29% | 3.29 pp | $30M | 24% |
| Q1 2025 | 56 | 13% | 57.58% | 142.41 pp | $40M | 91% |
| Q4 2024 | 64 | +3.2% | 199.99% | +139.72 pp | $452M | +474% |
| Q3 2024 | 62 | — | 60.27% | — | $79M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ACET stock.
Based on Q2 2026 13F filings, institutional ownership of Adicet Bio, Inc. stands at 65.9%, held across 56 reporting institutions.
RA CAPITAL MANAGEMENT, L.P. is the largest reported institutional holder of ACET, with approximately 932,624 shares worth $0.01B as of Q2 2026.
Yes — 5 widely-followed marquee investors appear among the top 25 institutional holders of ACET, including CITADEL ADVISORS LLC, RENAISSANCE TECHNOLOGIES LLC, TWO SIGMA INVESTMENTS, LP, JANE STREET GROUP, LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP.
Our composite Smart Money Score for ACET is 61 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
12 institutions opened new positions in ACET during Q2 2026, while 7 fully exited. 40 added to existing positions and 4 trimmed.
ACET institutional ownership fell by 2.20 percentage points quarter-over-quarter, with a net change of +5 holders.
The top 10 institutions account for 72.8% of all reported 13F value in ACET, and the top 25 account for 93.9%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Adicet Bio, Inc. (ACET) Institutional Ownership