Magnite, Inc. Common Stock (MGNI) Ownership & Trading Activity
Institutional holders, insider transactions, and congressional trades for MGNI. 13F holdings as of 2026-06-30.
In 13F filings for the quarter ended June 30, 2026, 297 institutions reported holding MGNI, with 141.1 million shares worth $2.7 billion in aggregate.
Top Institutional Holders
| Institution | Shares | Value | Change |
|---|---|---|---|
| Vanguard | 15,642,437 | $297M | INCREASED |
| BlackRock | 12,713,156 | $241M | INCREASED |
| FMR | 7,759,426 | $147M | INCREASED |
| Wellington Management | 6,044,492 | $115M | DECREASED |
| Dimensional Fund Advisors | 5,260,132 | $100M | INCREASED |
Recent Insider Trades
| Insider | Type | Shares | Value | Date |
|---|---|---|---|---|
| James Rossman (Director) | SELL | 49,190 | $1M | 2026-11-11 |
| Haas Sullivan (CHIEF ACCOUNTING OFFICER) | SELL | 2,427 | $72K | 2026-11-11 |
| Katie Seitz Evans (President, Product & Operations) | SELL | 26,178 | $758K | 2026-11-09 |
| Brian Gephart (CHIEF FINANCIAL OFFICER) | SELL | 3,700 | $106K | 2026-11-09 |
| David Buonasera (CHIEF TECHNOLOGY OFFICER) | SELL | 871 | $25K | 2026-11-09 |
Full institutional holdings, insider history, and congressional trades for Magnite, Inc. Common Stock on SentiSense.