Magnite (NASDAQ: MGNI) insider transactions
In the twelve months to 10 November 2026, executives and directors of Magnite reported 54 open-market sales of 1,313,902 shares ($27.3m) and 0 open-market purchases, by 13 people, according to the Form 4 filings they submitted to the SEC.
Latest transactions
| Date | Insider | Role | Transaction | Shares | Price | Held after | Filing |
|---|---|---|---|---|---|---|---|
| 5 November 2026 | Buckley Sean Patrick | See Remarks | Open-market sale, 10b5-1 plan | −10,991 | $27.00 | 282,069 | Form 4 |
| 5 November 2026 | Buonasera David | Chief Technology Officer | Open-market sale, 10b5-1 plan | −4,272 | $27.00 | 240,883 | Form 4 |
| 5 November 2026 | Buonasera David | Chief Technology Officer | Open-market sale, 10b5-1 plan | −1,434 | $28.00 | 239,449 | Form 4 |
| 12 October 2026 | Caine Paul | Director | Open-market sale, 10b5-1 plan | −12,500 | $25.29 | 124,901 | Form 4 |
| 1 October 2026 | Gephart Brian | Chief Financial Officer | Grant or award | +64,682 | — | 167,010 | Form 4 |
| 1 October 2026 | Sullivan Haas | Chief Accounting Officer | Grant or award | +24,641 | — | 97,554 | Form 4 |
| 17 September 2026 | Knopper Douglas S | Director | Open-market sale, 10b5-1 plan | −37,337 | $26.28 | 51,136 | Form 4 |
| 17 September 2026 | Caine Paul | Director | Open-market sale, 10b5-1 plan | −7,500 | $26.50 | 137,401 | Form 4 |
| 14 September 2026 | Spillane Robert F | Director | Option exercise | +10,363 | $5.17 | 68,078 | Form 4 |
| 14 September 2026 | Spillane Robert F | Director | Open-market sale | −10,363 | $23.76 | 57,715 | Form 4 |
| 14 September 2026 | Buonasera David | Chief Technology Officer | Open-market sale, 10b5-1 plan | −1,165 | $24.00 | 245,155 | Form 4 |
| 11 September 2026 | Evans Katie Seitz | See Remarks | Open-market sale, 10b5-1 plan | −13,997 | $24.00 | 441,800 | Form 4 |
| 10 September 2026 | Caine Paul | Director | Open-market sale, 10b5-1 plan | −5,000 | $23.53 | 144,901 | Form 4 |
| 10 September 2026 | Saltz Aaron | Chief Legal Officer | Open-market sale, 10b5-1 plan | −40,000 | $23.41 | 224,389 | Form 4 |
| 9 September 2026 | Evans Katie Seitz | See Remarks | Open-market sale, 10b5-1 plan | −11,100 | $23.46 | 455,797 | Form 4 |
| 8 September 2026 | Evans Katie Seitz | See Remarks | Option exercise, 10b5-1 plan | +13,546 | $5.16 | 499,182 | Form 4 |
| 8 September 2026 | Evans Katie Seitz | See Remarks | Open-market sale, 10b5-1 plan | −32,285 | $23.63 | 466,897 | Form 4 |
| 2 September 2026 | Buonasera David | Chief Technology Officer | Open-market sale, 10b5-1 plan | −1,043 | $25.00 | 246,320 | Form 4 |
| 1 September 2026 | Buonasera David | Chief Technology Officer | Open-market sale, 10b5-1 plan | −5,371 | $23.42 | 247,363 | Form 4 |
| 28 August 2026 | Harden Sarah Patricia | Director | Open-market sale, 10b5-1 plan | −18,436 | $24.00 | 114,751 | Form 4 |
Names appear as in the filing, surname first. A dash in the price column means the filing reports none, as in grants and gifts.
How to read the table
Only open-market purchases and sales are trades the insider chose to make at the market price, and they are the ones counted in the summary above. Grants, option exercises and shares withheld for tax come from pay plans. A sale marked as a 10b5-1 plan was scheduled in advance under a written plan.
Where each row comes from
From the Form 4 that each executive, director or large shareholder must file with the SEC within two business days of a transaction, read up to 10 November 2026. Each row links to its filing on EDGAR. Only transactions in shares are listed, not derivatives, and amended filings are left out. The accounts of the company are on the Magnite page; the method, in data sources.
Information prepared from the Form 4 filings submitted to the SEC, for information purposes only. It is not financial advice or a recommendation to buy or sell. Updated on 12 November 2026.