MGNI (Magnite, Inc. Common Stock)
Insider Trading Activity
Every open-market purchase and sale reported by MGNI officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-10 | Katie Seitz Evans | See Remarks | MIXED | — | — |
| 2026-09-03 | David Buonasera | CHIEF TECHNOLOGY OFFICER | Sell | — | — |
| 2026-08-28 | Sarah Patricia Harden | Director | Sell | — | — |
| 2026-08-18 | Katie Seitz Evans | See Remarks | F | — | — |
| 2026-08-18 | David Day | CHIEF FINANCIAL OFFICER | F | — | — |
| 2026-08-18 | Aaron Saltz | CHIEF LEGAL OFFICER | F | — | — |
| 2026-08-18 | Sean Patrick Buckley | See Remarks | MIXED | — | — |
| 2026-08-18 | David Buonasera | CHIEF TECHNOLOGY OFFICER | F | — | — |
| 2026-08-18 | Paul Caine | Director | Sell | — | — |
| 2026-08-18 | Brian Gephart | CHIEF ACCOUNTING OFFICER | F | — | — |
| 2026-08-18 | MICHAEL G. BARRETT | CEO | F | — | — |
| 2026-08-14 | David Day | CHIEF FINANCIAL OFFICER | G | — | — |
| 2026-08-12 | Paul Caine | Director | Sell | — | — |
| 2026-08-12 | Brian Gephart | CHIEF ACCOUNTING OFFICER | Sell | — | — |
| 2026-08-12 | Rachel Lam | Director | Sell | — | — |
| 2026-08-07 | David Buonasera | CHIEF TECHNOLOGY OFFICER | Sell | — | — |
| 2026-08-07 | Katie Seitz Evans | See Remarks | MIXED | — | — |
| 2026-08-07 | Sean Patrick Buckley | See Remarks | MIXED | — | — |
| 2026-08-07 | MICHAEL G. BARRETT | CEO | MIXED | — | — |
| 2026-08-07 | Douglas S Knopper | Director | Sell | — | — |
| 2026-08-07 | Douglas S Knopper | Director | Sell | — | — |
| 2026-08-07 | David Buonasera | CHIEF TECHNOLOGY OFFICER | Sell | — | — |
| 2026-08-07 | Katie Seitz Evans | See Remarks | MIXED | — | — |
| 2026-08-07 | Sean Patrick Buckley | See Remarks | MIXED | — | — |
| 2026-08-07 | MICHAEL G. BARRETT | CEO | MIXED | — | — |
| 2026-07-17 | MICHAEL G. BARRETT | CEO | MIXED | — | — |
| 2026-07-14 | Paul Caine | Director | Sell | — | — |
| 2026-07-09 | Sean Patrick Buckley | See Remarks | Sell | — | — |
| 2026-07-09 | David Buonasera | CHIEF TECHNOLOGY OFFICER | Sell | — | — |
| 2026-07-02 | David Buonasera | CHIEF TECHNOLOGY OFFICER | Sell | — | — |
| 2026-07-01 | MICHAEL G. BARRETT | CEO | MIXED | — | — |
| 2026-06-18 | Sean Patrick Buckley | See Remarks | Sell | — | — |
| 2026-06-17 | Douglas S Knopper | Director | Sell | — | — |
| 2026-06-17 | David Buonasera | CHIEF TECHNOLOGY OFFICER | Sell | — | — |
| 2026-06-17 | MICHAEL G. BARRETT | CEO | MIXED | — | — |
| 2026-06-10 | Rachel Lam | Director | A | — | — |
| 2026-06-10 | Robert F Spillane | Director | A | — | — |
| 2026-06-10 | DAVID T. PEARSON | Director | MIXED | — | — |
| 2026-06-10 | Diane Yu | Director | A | — | — |
| 2026-06-10 | Paul Caine | Director | A | — | — |
| 2026-06-10 | Sarah Patricia Harden | Director | A | — | — |
| 2026-06-10 | Douglas S Knopper | Director | MIXED | — | — |
| 2026-06-10 | James Rossman | Director | A | — | — |
| 2026-06-03 | David Buonasera | CHIEF TECHNOLOGY OFFICER | Sell | — | — |
| 2026-05-21 | Robert F Spillane | Director | Sell | — | — |
| 2026-05-19 | Sean Patrick Buckley | President, Revenue | F | — | — |
| 2026-05-19 | MICHAEL G. BARRETT | CEO | F | — | — |
| 2026-05-19 | Brian Gephart | CHIEF ACCOUNTING OFFICER | F | — | — |
| 2026-05-19 | Aaron Saltz | CHIEF LEGAL OFFICER | F | — | — |
| 2026-05-19 | Katie Seitz Evans | President, Operations | F | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | See Remarks | 485,636 | — |
| — | Chief Technology Officer | 473,763 | — |
| — | CHIEF FINANCIAL OFFICER | 452,861 | — |
| — | CEO | 392,670 | — |
| — | CHIEF PRODUCT OFFICER | 388,425 | — |
| — | Chief Revenue Officer, DV+ | 311,083 | — |
| — | See Remarks | 295,819 | — |
| — | CHIEF LEGAL OFFICER | 264,389 | — |
| — | CHIEF TECHNOLOGY OFFICER | 246,320 | — |
| — | Director | 230,620 | — |
| — | See remarks | 213,207 | — |
| — | Chief Technology Officer | 191,071 | — |
| — | Chief Accounting Officer | 178,129 | — |
| — | Director | 149,901 | — |
| — | Director | 119,090 | — |
| — | Director | 114,751 | — |
| — | Director | 114,218 | — |
| — | Director | 107,477 | — |
| — | CHIEF ACCOUNTING OFFICER | 102,328 | — |
| — | Director | 89,767 | — |
| — | Director | 88,473 | — |
| — | Director | 81,279 | — |
| — | Director | 57,715 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the MGNI quote page; the site-wide leaderboard is on the insider transactions hub.