Magnite (MGNI)
Runs sell-side marketplaces and ad-serving tools for streaming and digital publishers.
$24.73
vs last close−0.58 (−2.29%)
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13F · 13D/G · Form 4
| Institutions | 99.76% | 143.08M shares | |
|---|---|---|---|
| 333 holders · as of Jun 30, 2026 | |||
| Insiders | 2.37% | 3.40M shares | |
| 16 holders · as of Sep 18, 2026 | |||
| Adds to | 102.13% | ||
143.42M company shares as of Sep 22, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
These groups come from separate filings that can overlap, so they add to 102.13%; nothing is left for Other.
13F, as of Jun 30, 2026
333 holders · 143.08M shares · 58 new positions · 175 increased · 91 reduced · 40 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 12.71M | 8.86% | +1.06M | Aug 7, 2026 |
| Vanguard Portfolio Management LLC | 8.20M | 5.72% | +471.1K | Aug 13, 2026 |
| FMR LLC | 7.76M | 5.41% | +3.25M | Aug 13, 2026 |
| Vanguard Capital Management LLC | 6.23M | 4.34% | +34.8K | Aug 13, 2026 |
| Wellington Management Group LLP | 6.04M | 4.21% | −3.15M | Aug 14, 2026 |
| Dimensional Fund Advisors LP | 5.26M | 3.67% | +1.28M | Aug 11, 2026 |
| Boston Partners | 5.01M | 3.50% | +294.0K | Aug 4, 2026 |
| American Century Companies Inc | 4.62M | 3.22% | −4.1K | Aug 12, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Wellington Management Group LLP | 6.00% | 8.63M | 13G | Feb 10, 2026 |
| Vanguard Portfolio Management | 5.43% | 7.85M | 13G | Apr 29, 2026 |
| Vanguard Capital Management | 5.04% | 7.28M | 13G | Apr 30, 2026 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Sep 17, 2026 | Douglas S. Knopperdirector | Sale | 37,337 | $26.28 | 51,136 |
| Sep 17, 2026 | Paul Cainedirector | Sale | 7,500 | $26.50 | 137,401 |
| Sep 14, 2026 | Robert F. Spillanedirector | Sale | 10,363 | $23.76 | 57,715 |
| Sep 14, 2026 | David Buonaseraofficer: CHIEF TECHNOLOGY OFFICER | Sale | 1,165 | $24.00 | 245,155 |
| Sep 10, 2026 | Paul Cainedirector | Sale | 5,000 | $23.53 | 144,901 |
| Sep 10, 2026 | Aaron Saltzofficer: CHIEF LEGAL OFFICER | Sale | 40,000 | $23.41 | 224,389 |
| Sep 11, 2026 | Katie Seitz Evansofficer: See Remarks | Sale | 13,997 | $24.00 | 441,800 |
| Sep 9, 2026 | Katie Seitz Evansofficer: See Remarks | Sale | 11,100 | $23.46 | 455,797 |
| Sep 8, 2026 | Katie Seitz Evansofficer: See Remarks | Sale | 32,285 | $23.63 | 466,897 |
| Sep 2, 2026 | David Buonaseraofficer: CHIEF TECHNOLOGY OFFICER | Sale | 1,043 | $25.00 | 246,320 |
House and Senate disclosures
Not reported.