🕵️ Magnite, Inc. ($MGNI)
SEC insider & ownership activity, last 12 months · CIK 1595974 · every row links its SEC filing
Over the last 12 months insiders sold $26.0M with no open-market buying against it. Michael G. Barrett sold $13.6M through a 10b5-1 trading plan in 5 lots (Jun–Aug). 5 planned sales are pending, the largest $763K (Katheryn Evans). No red-flag 8-Ks in the window.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 13 sellers, $26.0M (52 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Michael G. Barrett | 0 | – | 5 | $13.6M | Aug 6, 2026 |
| Sean Buckley | 0 | – | 8 | $2.8M | Aug 18, 2026 |
| Evans Katie Seitz | 0 | – | 4 | $1.8M | Sep 11, 2026 |
| Douglas Knopper | 0 | – | 3 | $1.7M | Aug 6, 2026 |
| Saltz Aaron | 0 | – | 3 | $1.3M | Sep 10, 2026 |
| Harden Sarah Patricia | 0 | – | 2 | $1.2M | Aug 28, 2026 |
| Buonasera David | 0 | – | 12 | $841K | Sep 14, 2026 |
| Paul J. Caine | 0 | – | 6 | $818K | Sep 10, 2026 |
| Adam L. Soroca | 0 | – | 3 | $685K | Feb 18, 2026 |
| Robert F. Spillane | 0 | – | 3 | $557K | Sep 14, 2026 |
| Gephart Brian | 0 | – | 1 | $308K | Aug 10, 2026 |
| Lam Rachel | 0 | – | 1 | $242K | Aug 10, 2026 |
| David T. Pearson | 0 | – | 1 | $168K | Jun 10, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Vanguard Portfolio Management | 5.4% | 13G | Apr 29, 2026 | filing ↗ | |
| FMR LLC | 5.4% | 13G | Aug 6, 2026 | filing ↗ | |
| Abigail P. Johnson | 5.4% | 13G | Aug 6, 2026 | filing ↗ | |
| Wellington Management Company LLP | 5.2% | 13G | Feb 10, 2026 | filing ↗ | |
| Vanguard Capital Management | 5.0% | 13G | Apr 30, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Robert Spillane | $246K | Sep 14, 2026 | filing ↗ |
| David Buonasera | $28K | Sep 14, 2026 | filing ↗ |
| Katheryn Evans | $336K | Sep 11, 2026 | filing ↗ |
| Paul Caine | $236K | Sep 10, 2026 | filing ↗ |
| Aaron Saltz | $1.4M | Sep 10, 2026 | filing ↗ |
| Katheryn Evans | $260K | Sep 9, 2026 | filing ↗ |
| Katheryn Evans | $763K | Sep 8, 2026 | filing ↗ |
| David Buonasera | $26K | Sep 2, 2026 | filing ↗ |
| David Buonasera | $126K | Sep 1, 2026 | filing ↗ |
| Sarah Patricia Harden | $442K | Aug 28, 2026 | filing ↗ |
| Sarah Patricia Harden | $712K | Aug 26, 2026 | filing ↗ |
| Sean Buckley | $67K | Aug 18, 2026 | filing ↗ |
| Sean Buckley | $205K | Aug 17, 2026 | filing ↗ |
| Paul Caine | $61K | Aug 14, 2026 | filing ↗ |
| Rachel Lam | $242K | Aug 10, 2026 | filing ↗ |
| Brian Gephart | $308K | Aug 10, 2026 | filing ↗ |
| Sean Buckley | $1.4M | Aug 6, 2026 | filing ↗ |
| Douglas Knopper | $395K | Aug 6, 2026 | filing ↗ |
| Katheryn Evans | $480K | Aug 6, 2026 | filing ↗ |
| Douglas S. Knopper & Abigail L. Knopper (trustee) | $376K | Aug 6, 2026 | filing ↗ |
| David Buonasera | $179K | Aug 6, 2026 | filing ↗ |
| Michael G. Barrett | $6.7M | Aug 6, 2026 | filing ↗ |
| Michael G. Barrett | $786K | Jul 15, 2026 | filing ↗ |
| Paul Caine | $318K | Jul 10, 2026 | filing ↗ |
| Sean Buckley | $401K | Jul 7, 2026 | filing ↗ |
| Adam L. Soroca | $168K | Jul 7, 2026 | filing ↗ |
| David Buonasera | $26K | Jul 7, 2026 | filing ↗ |
| David Buonasera | $188K | Jul 1, 2026 | filing ↗ |
| Adam L. Soroca | $160K | Jul 1, 2026 | filing ↗ |
| Michael G. Barrett | $1.5M | Jun 29, 2026 | filing ↗ |
| Sean Buckley | $357K | Jun 17, 2026 | filing ↗ |
| Adam L. Soroca | $152K | Jun 17, 2026 | filing ↗ |
| David Buonasera | $27K | Jun 17, 2026 | filing ↗ |
| Douglas Knopper | $625K | Jun 16, 2026 | filing ↗ |
| David Buonasera | $202K | Jun 16, 2026 | filing ↗ |
| Michael G. Barrett | $1.8M | Jun 16, 2026 | filing ↗ |
| Adam L. Soroca | $108K | Jun 16, 2026 | filing ↗ |
| David Buonasera | $18K | Jun 15, 2026 | filing ↗ |
| Michael G. Barrett | $3.0M | Jun 15, 2026 | filing ↗ |
| Adam L. Soroca | $102K | Jun 15, 2026 | filing ↗ |
| Adam L. Soroca | $104K | Jun 11, 2026 | filing ↗ |
| Douglas Knopper | $170K | Jun 10, 2026 | filing ↗ |
| David T. Pearson | $169K | Jun 10, 2026 | filing ↗ |
| Adam L. Soroca | $105K | Jun 9, 2026 | filing ↗ |
| Adam L. Soroca | $101K | Jun 3, 2026 | filing ↗ |
| Adam L. Soroca | $418K | Jun 1, 2026 | filing ↗ |
| David Buonasera | $21K | Jun 1, 2026 | filing ↗ |
| Adam L. Soroca | $603K | May 28, 2026 | filing ↗ |
| Adam L. Soroca | $250K | May 27, 2026 | filing ↗ |
| Robert Spillane | $133K | May 19, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Earnings (2.02) | Aug 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 5, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jun 8, 2026 | filing ↗ |
| Earnings (2.02) | May 6, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 6, 2026 | filing ↗ |
| Officer/director changes (5.02) | Apr 20, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Apr 20, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 20, 2026 | filing ↗ |
| Officer/director changes (5.02) | Apr 7, 2026 | filing ↗ |
| Earnings (2.02) | Feb 25, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 25, 2026 | filing ↗ |
| Earnings (2.02) | Nov 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 5, 2025 | filing ↗ |