Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ACTG held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Starboard Value LP | 61.1M | $294.0M | 0.0% | 63.282% | 6.43% |
| 2 | STATE STREET CORP | 3.1M | $14.9M | -1.3% | 3.215% | 0.00% |
| 3 | DIMENSIONAL FUND ADVISORS LP | 2.9M | $13.7M | +3.5% | 2.955% | 0.00% |
| 4 | BlackRock, Inc. | 2.4M | $11.6M | +1.8% | 2.491% | 0.00% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 1.6M | $7.7M | β | 1.653% | 0.00% |
| 6 | RENAISSANCE TECHNOLOGIES LLC | 1.4M | $6.8M | +0.9% | 1.457% | 0.01% |
| 7 | Krilogy Financial LLC | 1.1M | $5.6M | -9.3% | 1.167% | 0.18% |
| 8 | Peapod Lane Capital LLC | 1.1M | $5.3M | +29.0% | 1.130% | 4.31% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 858K | $4.1M | +1.4% | 0.888% | 0.00% |
| 10 | Pacific Ridge Capital Partners, LLC | 817K | $3.9M | +0.9% | 0.846% | 0.85% |
| 11 | Formidable Asset Management, LLC | 839K | $3.7M | -3.7% | 0.869% | 0.58% |
| 12 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 604K | $2.9M | +36.6% | 0.625% | 0.06% |
| 13 | GOLDMAN SACHS GROUP INC | 584K | $2.8M | +89.0% | 0.605% | 0.00% |
| 14 | AMERICAN CENTURY COMPANIES INC | 511K | $2.5M | +3.7% | 0.529% | 0.00% |
| 15 | AEGIS FINANCIAL CORP | 491K | $2.4M | β | 0.508% | 0.41% |
| 16 | Empowered Funds, LLC | 340K | $1.6M | +39.1% | 0.352% | 0.01% |
| 17 | MORGAN STANLEY | 277K | $1.3M | -37.5% | 0.287% | 0.00% |
| 18 | NORTHERN TRUST CORP | 270K | $1.3M | +11.0% | 0.279% | 0.00% |
| 19 | VANGUARD PORTFOLIO MANAGEMENT LLC | 262K | $1.3M | β | 0.271% | 0.00% |
| 20 | VANGUARD FIDUCIARY TRUST CO | 221K | $1.1M | β | 0.229% | 0.00% |
| 21 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 208K | $1.0M | +49.5% | 0.215% | 0.00% |
| 22 | FRANKLIN RESOURCES INC | 185K | $891K | β | 0.192% | 0.00% |
| 23 | JANE STREET GROUP, LLC | 175K | $844K | +233.3% | 0.182% | 0.01% |
| 24 | CORSAIR CAPITAL MANAGEMENT, L.P. | 167K | $802K | 0.0% | 0.173% | 0.12% |
| 25 | Marquette Asset Management, LLC | 149K | $719K | +60.3% | 0.155% | 0.11% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in ACTG β a direct measure of their conviction.
Filings activity in ACTG during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new ACTG position in Q1 2026
Institutions that fully closed their ACTG position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 112 | +20% | 89.15% | +19.54 pp | $403M | +28% |
| Q4 2025 | 93 | +6.9% | 69.61% | +9.10 pp | $315M | +15% |
| Q3 2025 | 87 | +1.2% | 60.51% | 5.60 pp | $274M | 8.5% |
| Q2 2025 | 86 | 2.3% | 66.11% | +7.48 pp | $299M | +13% |
| Q1 2025 | 88 | 7.4% | 58.63% | 40.63 pp | $265M | 41% |
| Q4 2024 | 95 | 7.8% | 99.26% | +11.88 pp | $449M | +14% |
| Q3 2024 | 103 | +1.0% | 87.38% | 8.12 pp | $395M | 8.5% |
| Q2 2024 | 102 | β | 95.50% | β | $432M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ACTG stock.
Based on Q1 2026 13F filings, institutional ownership of Acacia Research Corporation stands at 89.1%, held across 112 reporting institutions.
Starboard Value LP is the largest reported institutional holder of ACTG, with approximately 61,123,595 shares worth $0.29B as of Q1 2026.
Yes β 3 widely-followed marquee investors appear among the top 25 institutional holders of ACTG, including RENAISSANCE TECHNOLOGIES LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP, JANE STREET GROUP, LLC.
Our composite Smart Money Score for ACTG is 78 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
31 institutions opened new positions in ACTG during Q1 2026, while 12 fully exited. 67 added to existing positions and 13 trimmed.
ACTG institutional ownership rose by 19.54 percentage points quarter-over-quarter, with a net change of +19 holders.
The top 10 institutions account for 91.2% of all reported 13F value in ACTG, and the top 25 account for 97.5%.
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.
Acacia Research Corporation (ACTG) Institutional Ownership