MAGNITE INC (MGNI) — insider trading
Communication Services · NASDAQ
MAGNITE INC (MGNI) has 87 reported SEC Form 4 insider transactions in our data, including 44 open-market sales among the most recent 87 (latest 2026-10-01).
Recent Form 4 transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-10-01 | Sullivan Haas | Officer (CHIEF ACCOUNTING OFFICER) | Grant / award / vesting | 24,641 | — | $0 | Form 4 |
| 2026-10-01 | Gephart Brian | Officer (CHIEF FINANCIAL OFFICER) | Grant / award / vesting | 64,682 | — | $0 | Form 4 |
| 2026-09-17 | Knopper Douglas S | Director | Open-market sale | 37,337 | $26.28 | $981.2K | Form 4 |
| 2026-09-17 | Caine Paul | Director | Open-market sale | 7,500 | $26.50 | $198.8K | Form 4 |
| 2026-09-14 | Spillane Robert F | Director | Option exercise / conversion (derivative) | 10,363 | — | $0 | Form 4 |
| 2026-09-14 | Spillane Robert F | Director | Open-market sale | 10,363 | $23.76 | $246.2K | Form 4 |
| 2026-09-14 | Spillane Robert F | Director | Option exercise / conversion | 10,363 | $5.17 | $53.6K | Form 4 |
| 2026-09-14 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Open-market sale | 1,165 | $24.00 | $28.0K | Form 4 |
| 2026-09-11 | Evans Katie Seitz | Officer (See Remarks) | Open-market sale | 13,997 | $24.00 | $335.9K | Form 4 |
| 2026-09-10 | Saltz Aaron | Officer (CHIEF LEGAL OFFICER) | Open-market sale | 40,000 | $23.41 | $936.4K | Form 4 |
| 2026-09-10 | Caine Paul | Director | Open-market sale | 5,000 | $23.53 | $117.7K | Form 4 |
| 2026-09-09 | Evans Katie Seitz | Officer (See Remarks) | Open-market sale | 11,100 | $23.46 | $260.4K | Form 4 |
| 2026-09-08 | Evans Katie Seitz | Officer (See Remarks) | Option exercise / conversion (derivative) | 13,546 | — | $0 | Form 4 |
| 2026-09-08 | Evans Katie Seitz | Officer (See Remarks) | Open-market sale | 32,285 | $23.63 | $762.9K | Form 4 |
| 2026-09-08 | Evans Katie Seitz | Officer (See Remarks) | Option exercise / conversion | 13,546 | $5.16 | $69.9K | Form 4 |
| 2026-09-02 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Open-market sale | 1,043 | $25.00 | $26.1K | Form 4 |
| 2026-09-01 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Open-market sale | 5,371 | $23.42 | $125.8K | Form 4 |
| 2026-08-28 | Harden Sarah Patricia | Director | Open-market sale | 18,436 | $24.00 | $442.5K | Form 4 |
| 2026-08-26 | Harden Sarah Patricia | Director | Open-market sale | 30,550 | $23.31 | $712.1K | Form 4 |
| 2026-08-18 | Buckley Sean Patrick | Officer (See Remarks) | Open-market sale | 2,759 | $25.00 | $69.0K | Form 4 |
| 2026-08-17 | Buckley Sean Patrick | Officer (See Remarks) | Open-market sale | 8,271 | $24.31 | $201.1K | Form 4 |
| 2026-08-15 | Buckley Sean Patrick | Officer (See Remarks) | Shares withheld for taxes / exercise cost | 11,715 | $24.73 | $289.7K | Form 4 |
| 2026-08-15 | Day David | Officer (CHIEF FINANCIAL OFFICER) | Shares withheld for taxes / exercise cost | 14,170 | $24.73 | $350.4K | Form 4 |
| 2026-08-15 | BARRETT MICHAEL G. | Director, Officer (CEO) | Shares withheld for taxes / exercise cost | 10,404 | $24.73 | $257.3K | Form 4 |
| 2026-08-15 | Gephart Brian | Officer (CHIEF ACCOUNTING OFFICER) | Shares withheld for taxes / exercise cost | 3,789 | $24.73 | $93.7K | Form 4 |
| 2026-08-15 | Saltz Aaron | Officer (CHIEF LEGAL OFFICER) | Shares withheld for taxes / exercise cost | 5,627 | $24.73 | $139.2K | Form 4 |
| 2026-08-15 | Evans Katie Seitz | Officer (See Remarks) | Shares withheld for taxes / exercise cost | 11,204 | $24.73 | $277.1K | Form 4 |
| 2026-08-15 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Shares withheld for taxes / exercise cost | 8,102 | $24.73 | $200.4K | Form 4 |
| 2026-08-14 | Caine Paul | Director | Open-market sale | 7,500 | $25.00 | $187.5K | Form 4 |
| 2026-08-13 | Day David | Officer (CHIEF FINANCIAL OFFICER) | Bona fide gift | 26,258 | — | $0 | Form 4 |
| 2026-08-10 | Caine Paul | Director | Open-market sale | 5,000 | $24.35 | $121.8K | Form 4 |
| 2026-08-10 | Lam Rachel | Director | Open-market sale | 10,000 | $24.16 | $241.6K | Form 4 |
| 2026-08-10 | Gephart Brian | Officer (CHIEF ACCOUNTING OFFICER) | Open-market sale | 12,479 | $24.68 | $308.0K | Form 4 |
| 2026-08-06 | BARRETT MICHAEL G. | Director, Officer (CEO) | Option exercise / conversion (derivative) | 293,968 | — | $0 | Form 4 |
| 2026-08-06 | BARRETT MICHAEL G. | Director, Officer (CEO) | Open-market sale | 293,968 | $22.72 | $6.68M | Form 4 |
| 2026-08-06 | BARRETT MICHAEL G. | Director, Officer (CEO) | Option exercise / conversion | 293,968 | $5.80 | $1.71M | Form 4 |
| 2026-08-06 | Evans Katie Seitz | Officer (See Remarks) | Option exercise / conversion (derivative) | 20,000 | — | $0 | Form 4 |
| 2026-08-06 | Evans Katie Seitz | Officer (See Remarks) | Open-market sale | 20,000 | $24.00 | $480.0K | Form 4 |
| 2026-08-06 | Evans Katie Seitz | Officer (See Remarks) | Option exercise / conversion | 20,000 | $5.16 | $103.2K | Form 4 |
| 2026-08-06 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Open-market sale | 871 | $25.00 | $21.8K | Form 4 |
| 2026-08-06 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Open-market sale | 2,602 | $24.00 | $62.4K | Form 4 |
| 2026-08-06 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Open-market sale | 4,176 | $22.81 | $95.3K | Form 4 |
| 2026-08-06 | Knopper Douglas S | Director | Open-market sale | 37,337 | $22.72 | $848.3K | Form 4 |
| 2026-08-06 | Buckley Sean Patrick | Officer (See Remarks) | Option exercise / conversion (derivative) | 28,703 | — | $0 | Form 4 |
| 2026-08-06 | Buckley Sean Patrick | Officer (See Remarks) | Open-market sale | 19,237 | $23.00 | $442.5K | Form 4 |
| 2026-08-06 | Buckley Sean Patrick | Officer (See Remarks) | Open-market sale | 47,942 | $25.09 | $1.20M | Form 4 |
| 2026-08-06 | Buckley Sean Patrick | Officer (See Remarks) | Option exercise / conversion | 28,703 | $13.90 | $399.0K | Form 4 |
| 2026-07-15 | BARRETT MICHAEL G. | Director, Officer (CEO) | Option exercise / conversion (derivative) | 38,596 | — | $0 | Form 4 |
| 2026-07-15 | BARRETT MICHAEL G. | Director, Officer (CEO) | Open-market sale | 38,596 | $20.35 | $785.4K | Form 4 |
| 2026-07-15 | BARRETT MICHAEL G. | Director, Officer (CEO) | Option exercise / conversion | 38,596 | $5.80 | $223.9K | Form 4 |
| 2026-07-10 | Caine Paul | Director | Open-market sale | 5,000 | $20.64 | $103.2K | Form 4 |
| 2026-07-07 | Buckley Sean Patrick | Officer (See Remarks) | Open-market sale | 19,233 | $21.03 | $404.5K | Form 4 |
| 2026-07-07 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Open-market sale | 1,224 | $21.00 | $25.7K | Form 4 |
| 2026-07-01 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Open-market sale | 9,376 | $20.00 | $187.5K | Form 4 |
| 2026-06-29 | BARRETT MICHAEL G. | Director, Officer (CEO) | Option exercise / conversion (derivative) | 75,000 | — | $0 | Form 4 |
| 2026-06-29 | BARRETT MICHAEL G. | Director, Officer (CEO) | Open-market sale | 75,000 | $19.50 | $1.46M | Form 4 |
| 2026-06-29 | BARRETT MICHAEL G. | Director, Officer (CEO) | Option exercise / conversion | 75,000 | $5.80 | $435.0K | Form 4 |
| 2026-06-17 | Buckley Sean Patrick | Officer (See Remarks) | Open-market sale | 19,233 | $19.00 | $365.4K | Form 4 |
| 2026-06-17 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Open-market sale | 1,409 | $19.00 | $26.8K | Form 4 |
| 2026-06-16 | BARRETT MICHAEL G. | Director, Officer (CEO) | Option exercise / conversion (derivative) | 100,000 | — | $0 | Form 4 |
| 2026-06-16 | BARRETT MICHAEL G. | Director, Officer (CEO) | Open-market sale | 100,000 | $17.50 | $1.75M | Form 4 |
| 2026-06-16 | BARRETT MICHAEL G. | Director, Officer (CEO) | Option exercise / conversion | 100,000 | $5.80 | $580.0K | Form 4 |
| 2026-06-16 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Open-market sale | 11,233 | $18.00 | $202.2K | Form 4 |
| 2026-06-16 | Knopper Douglas S | Director | Open-market sale | 37,337 | $18.10 | $675.8K | Form 4 |
| 2026-06-15 | BARRETT MICHAEL G. | Director, Officer (CEO) | Option exercise / conversion (derivative) | 178,596 | — | $0 | Form 4 |
| 2026-06-15 | BARRETT MICHAEL G. | Director, Officer (CEO) | Open-market sale | 178,596 | $16.59 | $2.96M | Form 4 |
| 2026-06-15 | BARRETT MICHAEL G. | Director, Officer (CEO) | Option exercise / conversion | 178,596 | $5.80 | $1.04M | Form 4 |
| 2026-06-15 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Open-market sale | 1,057 | $17.00 | $18.0K | Form 4 |
| 2026-06-10 | PEARSON DAVID T. | Director | Open-market sale | 10,766 | $15.65 | $168.5K | Form 4 |
| 2026-06-10 | Knopper Douglas S | Director | Open-market sale | 10,766 | $15.73 | $169.3K | Form 4 |
| 2026-06-08 | PEARSON DAVID T. | Director | Grant / award / vesting | 13,798 | — | $0 | Form 4 |
| 2026-06-08 | Lam Rachel | Director | Grant / award / vesting | 13,798 | — | $0 | Form 4 |
| 2026-06-08 | Rossman James | Director | Grant / award / vesting | 13,798 | — | $0 | Form 4 |
| 2026-06-08 | Knopper Douglas S | Director | Grant / award / vesting | 13,798 | — | $0 | Form 4 |
| 2026-06-08 | Harden Sarah Patricia | Director | Grant / award / vesting | 13,798 | — | $0 | Form 4 |
| 2026-06-08 | Spillane Robert F | Director | Grant / award / vesting | 13,798 | — | $0 | Form 4 |
| 2026-06-08 | Yu Diane | Director | Grant / award / vesting | 13,798 | — | $0 | Form 4 |
| 2026-06-08 | Caine Paul | Director | Grant / award / vesting | 13,798 | — | $0 | Form 4 |
| 2026-06-01 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Open-market sale | 1,409 | $15.00 | $21.1K | Form 4 |
| 2026-05-19 | Spillane Robert F | Director | Open-market sale | 10,000 | $13.33 | $133.3K | Form 4 |
| 2026-05-15 | Buonasera David | Officer (CHIEF TECHNOLOGY OFFICER) | Shares withheld for taxes / exercise cost | 8,335 | $12.82 | $106.9K | Form 4 |
| 2026-05-15 | Gephart Brian | Officer (CHIEF ACCOUNTING OFFICER) | Shares withheld for taxes / exercise cost | 3,789 | $12.82 | $48.6K | Form 4 |
| 2026-05-15 | Saltz Aaron | Officer (CHIEF LEGAL OFFICER) | Shares withheld for taxes / exercise cost | 5,627 | $12.82 | $72.1K | Form 4 |
| 2026-05-15 | Day David | Officer (CHIEF FINANCIAL OFFICER) | Shares withheld for taxes / exercise cost | 14,170 | $12.82 | $181.7K | Form 4 |
| 2026-05-15 | Evans Katie Seitz | Officer (President, Operations) | Shares withheld for taxes / exercise cost | 11,204 | $12.82 | $143.6K | Form 4 |
| 2026-05-15 | Buckley Sean Patrick | Officer (President, Revenue) | Shares withheld for taxes / exercise cost | 12,019 | $12.82 | $154.1K | Form 4 |
| 2026-05-15 | BARRETT MICHAEL G. | Director, Officer (CEO) | Shares withheld for taxes / exercise cost | 10,404 | $12.82 | $133.4K | Form 4 |
Ask the chat about MGNI's insider activity →
Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: MAGNITE INC (MGNI).
Last updated 2026-10-01 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.