PubMatic, Inc. (PUBM) ownership: Top institutional holder: Graham Holdings Co ($27.80M). Insider activity: Net Seller (0 buys, 20 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| Graham Holdings Co | 3398904.00 | $27.80M | 2026-03-31 |
| BlackRock, Inc. | 3065036.00 | $25.07M | 2026-03-31 |
| VANGUARD GROUP INC | 2379185.00 | $21.10M | 2025-12-31 |
| CenterBook Partners LP | 1742100.00 | $14.25M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 1613769.00 | $13.20M | 2026-03-31 |
| ACADIAN ASSET MANAGEMENT LLC | 1576540.00 | $12.89M | 2026-03-31 |
| RENAISSANCE TECHNOLOGIES LLC | 1540533.00 | $12.60M | 2026-03-31 |
| WELLINGTON MANAGEMENT GROUP LLP | 1170952.00 | $10.39M | 2025-12-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-02 | |
| Sell | null | 2026-06-02 | |
| Sell | null | 2026-06-02 | |
| Sell | null | 2026-06-02 | |
| Sell | null | 2026-06-02 | |
| Sell | null | 2026-05-31 | |
| Sell | null | 2026-05-31 | |
| Sell | null | 2026-05-31 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.