Who owns PubMatic, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of PUBM from SEC Form 13F filings across 153 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 153 institutions disclosed 30.5M shares of PubMatic, Inc. worth $399.4M — about 66.1% of shares outstanding; the largest disclosed holder is Graham Holdings Co. Source: SEC Form 13F filings, parsed by EvidInvest.
153
13F holders
$399.4M
value, 2026 filers
66.1%
of shares outstanding (30.5M sh)
20
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of PUBM's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | Graham Holdings Co | 3.4M | $44.6M | 4.1% | 7.4% | 0.0% |
| 2 | BlackRock, Inc. | 3.3M | $43.0M | 0.0% | 7.1% | +7.0% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 1.7M | $21.8M | 0.0% | 3.6% | +2.9% |
| 4 | ACADIAN ASSET MANAGEMENT LLC | 1.6M | $20.6M | 0.0% | 3.4% | -0.2% |
| 5 | DIMENSIONAL FUND ADVISORS LP | 1.5M | $19.6M | 0.0% | 3.2% | +19.7% |
| 6 | RENAISSANCE TECHNOLOGIES LLC | 1.4M | $18.6M | 0.0% | 3.1% | -7.8% |
| 7 | Whitefort Capital Management, LP | 1.1M | $14.6M | 3.6% | 2.4% | +61.0% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 991,800 | $13.0M | 0.0% | 2.2% | +4.3% |
| 9 | VANGUARD PORTFOLIO MANAGEMENT LLC | 947,548 | $12.4M | 0.0% | 2.1% | +48.3% |
| 10 | JACOBS LEVY EQUITY MANAGEMENT, INC | 862,996 | $11.3M | 0.0% | 1.9% | -7.4% |
| 11 | STATE STREET CORP | 854,147 | $11.2M | 0.0% | 1.9% | +7.9% |
| 12 | S SQUARED TECHNOLOGY, LLC | 748,099 | $9.8M | 3.0% | 1.6% | +10.6% |
| 13 | Simcoe Capital LLC | 693,903 | $9.1M | 5.6% | 1.5% | +42.7% |
| 14 | HIGHBRIDGE CAPITAL MANAGEMENT LLCNEW | 644,593 | $8.4M | 0.2% | 1.4% | new |
| 15 | AMERICAN CENTURY COMPANIES INC | 642,076 | $8.4M | 0.0% | 1.4% | +471.9% |
| 16 | TWO SIGMA INVESTMENTS, LP | 638,102 | $8.4M | 0.0% | 1.4% | +19.4% |
| 17 | ROYAL BANK OF CANADA | 619,290 | $8.1M | 0.0% | 1.3% | -16.3% |
| 18 | Nuveen, LLC | 464,187 | $6.1M | 0.0% | 1% | +459.7% |
| 19 | CITADEL ADVISORS LLC | 414,880 | $5.4M | 0.0% | 0.9% | +178.4% |
| 20 | CenterBook Partners LP | 413,983 | $5.4M | 0.3% | 0.9% | -76.2% |
| 21 | Trexquant Investment LP | 382,525 | $5.0M | 0.0% | 0.8% | -9.4% |
| 22 | NORTHERN TRUST CORP | 348,134 | $4.6M | 0.0% | 0.8% | +19.8% |
| 23 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 303,624 | $4.0M | 0.0% | 0.7% | +3.0% |
| 24 | PANAGORA ASSET MANAGEMENT INC | 287,735 | $3.8M | 0.0% | 0.6% | +4.2% |
| 25 | AQR CAPITAL MANAGEMENT LLC | 286,438 | $3.8M | 0.0% | 0.6% | +129.2% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.