Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in PUBM held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 3.1M | $25.1M | -1.9% | 6.563% | 0.00% |
| 2 | CenterBook Partners LP | 1.7M | $14.3M | +51.9% | 3.730% | 0.77% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 1.6M | $13.2M | — | 3.455% | 0.00% |
| 4 | RENAISSANCE TECHNOLOGIES LLC | 1.5M | $12.6M | +26.3% | 3.299% | 0.02% |
| 5 | DIMENSIONAL FUND ADVISORS LP | 1.2M | $10.2M | -2.1% | 2.667% | 0.00% |
| 6 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 999K | $8.2M | +92.8% | 2.140% | 0.00% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 951K | $7.8M | +4.9% | 2.035% | 0.00% |
| 8 | JACOBS LEVY EQUITY MANAGEMENT, INC | 932K | $7.6M | +0.3% | 1.996% | 0.03% |
| 9 | STATE STREET CORP | 791K | $6.5M | -4.7% | 1.695% | 0.00% |
| 10 | ROYAL BANK OF CANADA | 740K | $6.1M | -14.2% | 1.585% | 0.00% |
| 11 | Walleye Trading LLC | 714K | $5.8M | +1248.0% | 1.529% | 0.01% |
| 12 | Whitefort Capital Management, LP | 690K | $5.6M | — | 1.477% | 1.72% |
| 13 | S Squared Technology, LLC | 676K | $5.5M | +140.7% | 1.448% | 2.09% |
| 14 | VANGUARD PORTFOLIO MANAGEMENT LLC | 639K | $5.2M | — | 1.368% | 0.00% |
| 15 | TWO SIGMA INVESTMENTS, LP | 534K | $4.4M | +12.7% | 1.144% | 0.00% |
| 16 | Simcoe Capital LLC | 486K | $4.0M | +19.0% | 1.041% | 3.65% |
| 17 | CITADEL ADVISORS LLC | 482K | $3.9M | -19.1% | 1.031% | 0.00% |
| 18 | D. E. Shaw & Co., Inc. | 445K | $3.6M | -18.6% | 0.953% | 0.00% |
| 19 | Trexquant Investment LP | 422K | $3.5M | +37.5% | 0.904% | 0.03% |
| 20 | GOLDMAN SACHS GROUP INC | 354K | $2.9M | +42.0% | 0.758% | 0.00% |
| 21 | TUDOR INVESTMENT CORP ET AL | 351K | $2.9M | +248.9% | 0.752% | 0.01% |
| 22 | MORGAN STANLEY | 342K | $2.8M | +6.6% | 0.732% | 0.00% |
| 23 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 295K | $2.4M | -1.8% | 0.631% | 0.00% |
| 24 | NORTHERN TRUST CORP | 291K | $2.4M | +7.8% | 0.622% | 0.00% |
| 25 | PANAGORA ASSET MANAGEMENT INC | 276K | $2.3M | +1.1% | 0.592% | 0.01% |
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 PUBM — a direct measure of their conviction.
Filings activity in PUBM during Q1 2026, grouped by how each filer changed its position.
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 |
|---|---|---|---|---|---|---|
| Q1 2026 | 150 | 0.7% | 38.49% | 2.24 pp | $204M | 5.5% |
| Q4 2025 | 151 | +2.0% | 40.73% | +3.03 pp | $216M | +8.0% |
| Q3 2025 | 148 | +0.0% | 37.70% | 14.56 pp | $200M | 28% |
| Q2 2025 | 148 | 2.6% | 52.26% | +13.77 pp | $277M | +36% |
| Q1 2025 | 152 | 2.6% | 38.49% | 27.51 pp | $204M | 42% |
| Q4 2024 | 156 | 2.5% | 66.00% | +2.76 pp | $350M | +4.4% |
| Q3 2024 | 160 | 14% | 63.24% | 27.43 pp | $335M | 30% |
| Q2 2024 | 186 | — | 90.67% | — | $481M | — |
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 PUBM stock.
Based on Q1 2026 13F filings, institutional ownership of PubMatic, Inc. stands at 38.5%, held across 150 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of PUBM, with approximately 3,065,036 shares worth $0.03B as of Q1 2026.
Yes — 4 widely-followed marquee investors appear among the top 25 institutional holders of PUBM, including RENAISSANCE TECHNOLOGIES LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP, TWO SIGMA INVESTMENTS, LP, CITADEL ADVISORS LLC.
Our composite Smart Money Score for PUBM is 47 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
33 institutions opened new positions in PUBM during Q1 2026, while 34 fully exited. 47 added to existing positions and 69 trimmed.
PUBM institutional ownership fell by 2.24 percentage points quarter-over-quarter, with a net change of -1 holders.
The top 10 institutions account for 54.6% of all reported 13F value in PUBM, and the top 25 account for 82.7%.
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.
PubMatic, Inc. (PUBM) Institutional Ownership