Magnite
Runs sell-side marketplaces and ad-serving tools for streaming and digital publishers.
$23.10
After-hours close−0.58 (−2.45%)
At close$23.68(+1.37%)
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Breakdown13F · Form 4
Institutions 102.06%Insiders 2.47%
A 13F quarter can total more than the shares outstanding — sub-advisers file the same block twice, and a filer's own share count can be a quarter stale. No split is drawn from it.
Shares outstanding 143.22M · Float 141.15M · 98.6% free float
Institutions13F, as of Jun 30, 2026
331 holders · 146.17M shares · 58 new positions · 176 increased · 88 reduced · 42 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 12.71M | 8.88% | +1.06M | Aug 7, 2026 |
| Vanguard Portfolio Management LLC | 8.20M | 5.72% | +471.1K | Aug 13, 2026 |
| FMR LLC | 7.76M | 5.42% | +3.25M | Aug 13, 2026 |
| Vanguard Capital Management LLC | 6.23M | 4.35% | +34.8K | Aug 13, 2026 |
| Wellington Management Group LLP | 6.04M | 4.22% | −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 | 3.23% | −4.1K | Aug 12, 2026 |
Beneficial owners13D/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 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Katie Seitz Evans | officer: See Remarks | 485.6K | 0.34% | Aug 18, 2026 |
| David Day | officer: CHIEF FINANCIAL OFFICER | 452.9K | 0.32% | Aug 18, 2026 |
| Michael G. Barrett | director, officer: CEO | 392.7K | 0.27% | Aug 18, 2026 |
| Adam Lee Soroca | officer: CHIEF PRODUCT OFFICER | 388.4K | 0.27% | Feb 18, 2026 |
| Sean Patrick Buckley | officer: See Remarks | 293.1K | 0.20% | Aug 18, 2026 |
| Aaron Saltz | officer: CHIEF LEGAL OFFICER | 264.4K | 0.18% | Aug 18, 2026 |
| David Buonasera | officer: CHIEF TECHNOLOGY OFFICER | 252.7K | 0.18% | Aug 18, 2026 |
| Rachel Lam | director | 230.6K | 0.16% | Aug 12, 2026 |
| Paul Caine | director | 149.9K | 0.10% | Aug 18, 2026 |
| Sarah Patricia Harden | director | 114.8K | 0.08% | Aug 28, 2026 |
4 ten-percent owners hold 10.69M shares by Form 4, outside the officers-and-directors figure above · 19 people have not refiled in the last 18 months (5.00M shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 28, 2026 | Sarah Patricia Hardendirector | Sale | 18,436 | $24.00 | 114,751 |
| Aug 26, 2026 | Sarah Patricia Hardendirector | Sale | 30,550 | $23.31 | 133,187 |
| Aug 14, 2026 | Paul Cainedirector | Sale | 7,500 | $25.00 | 149,901 |
| Aug 18, 2026 | Sean Patrick Buckleyofficer: See Remarks | Sale | 2,759 | $25.00 | 293,060 |
| Aug 17, 2026 | Sean Patrick Buckleyofficer: See Remarks | Sale | 8,271 | $24.31 | 295,819 |
| Aug 10, 2026 | Rachel Lamdirector | Sale | 10,000 | $24.16 | 230,620 |
| Aug 10, 2026 | Brian Gephartofficer: CHIEF ACCOUNTING OFFICER | Sale | 12,479 | $24.68 | 106,117 |
| Aug 10, 2026 | Paul Cainedirector | Sale | 5,000 | $24.35 | 157,401 |
| Aug 6, 2026 | Michael G. Barrettdirector, officer: CEO | Sale | 293,968 | $22.72 | 403,074 |
| Aug 6, 2026 | Katie Seitz Evansofficer: See Remarks | Sale | 20,000 | $24.00 | 496,840 |
CongressHouse and Senate disclosures
Not reported.