MGNI insider transaction filings
MAGNITE, INC. — 50 most recent Form 4 filings from SEC EDGAR, normalized by FilingPulse. Latest filing: 2026-09-18. Screen MGNI transaction legs live →
Insider transaction summary — last 90 days
2026-06-24 to 2026-09-22, from the filings listed below: 33 Form 4 filings. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): 33 legs across 26 filings by 11 insiders — 834,718 shares, $19,103,618 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 22.
- Largest priced transaction: sale of 293,968 shares @ $22.72 ($6,678,953) by BARRETT MICHAEL G., filed 2026-08-07.
By insider — same window
Open-market purchase/sale legs on non-derivative securities, grouped by the filing's reporting owner(s); joint filings appear once. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Insider | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|
| BARRETT MICHAEL G. — CEO, Director | 4 | — | 3 legs · 407,564 sh · $8,926,882 | 7 |
| Buckley Sean Patrick — See Remarks | 3 | — | 5 legs · 97,442 sh · $2,319,829 | 3 |
| Evans Katie Seitz — See Remarks | 4 | — | 4 legs · 77,382 sh · $1,839,229 | 5 |
| Knopper Douglas S — Director | 2 | — | 2 legs · 74,674 sh · $1,829,513 | — |
| Harden Sarah Patricia — Director | 1 | — | 2 legs · 48,986 sh · $1,154,584 | — |
| Saltz Aaron — CHIEF LEGAL OFFICER | 2 | — | 1 leg · 40,000 sh · $936,400 | 1 |
| Caine Paul — Director | 5 | — | 5 legs · 30,000 sh · $728,850 | — |
| Buonasera David — CHIEF TECHNOLOGY OFFICER | 6 | — | 8 legs · 25,828 sh · $572,525 | 1 |
| Gephart Brian — CHIEF ACCOUNTING OFFICER | 2 | — | 1 leg · 12,479 sh · $307,982 | 1 |
| Spillane Robert F — Director | 1 | — | 1 leg · 10,363 sh · $246,225 | 2 |
+2 more insiders in the window, not shown — every filing appears in the table below.
Recent Form 4 filings — MAGNITE, INC.
| Filed | Form | Insider | Reported transactions | Source |
|---|---|---|---|---|
| 2026-09-18 | 4 | Knopper Douglas S — Director | Sale (S): 37,337 @ $26.28 | EDGAR |
| 2026-09-18 | 4 | Caine Paul — Director | Sale (S): 7,500 @ $26.50 | EDGAR |
| 2026-09-16 | 4 | Spillane Robert F — Director | Option exercise (M): 10,363 @ $5.17 · Sale (S): 10,363 @ $23.76 · Option exercise (M): 10,363 (derivative) @ $0 | EDGAR |
| 2026-09-16 | 4 | Buonasera David — CHIEF TECHNOLOGY OFFICER | Sale (S): 1,165 @ $24 | EDGAR |
| 2026-09-11 | 4 | Evans Katie Seitz — See Remarks | Sale (S): 13,997 @ $24 | EDGAR |
| 2026-09-11 | 4 | Caine Paul — Director | Sale (S): 5,000 @ $23.53 | EDGAR |
| 2026-09-11 | 4 | Saltz Aaron — CHIEF LEGAL OFFICER | Sale (S): 40,000 @ $23.41 | EDGAR |
| 2026-09-10 | 4 | Evans Katie Seitz — See Remarks | Option exercise (M): 13,546 @ $5.16 · Sale (S): 32,285 @ $23.63 · Sale (S): 11,100 @ $23.46 · Option exercise (M): 13,546 (derivative) @ $0 | EDGAR |
| 2026-09-03 | 4 | Buonasera David — CHIEF TECHNOLOGY OFFICER | Sale (S): 5,371 @ $23.42 · Sale (S): 1,043 @ $25 | EDGAR |
| 2026-08-28 | 4 | Harden Sarah Patricia — Director | Sale (S): 30,550 @ $23.31 · Sale (S): 18,436 @ $24 | EDGAR |
| 2026-08-18 | 4 | Buonasera David — CHIEF TECHNOLOGY OFFICER | Tax withholding (F): 8,102 @ $24.73 | EDGAR |
| 2026-08-18 | 4 | Gephart Brian — CHIEF ACCOUNTING OFFICER | Tax withholding (F): 3,789 @ $24.73 | EDGAR |
| 2026-08-18 | 4 | Saltz Aaron — CHIEF LEGAL OFFICER | Tax withholding (F): 5,627 @ $24.73 | EDGAR |
| 2026-08-18 | 4 | Evans Katie Seitz — See Remarks | Tax withholding (F): 11,204 @ $24.73 | EDGAR |
| 2026-08-18 | 4 | Caine Paul — Director | Sale (S): 7,500 @ $25 | EDGAR |
| 2026-08-18 | 4 | Day David — CHIEF FINANCIAL OFFICER | Tax withholding (F): 14,170 @ $24.73 | EDGAR |
| 2026-08-18 | 4 | BARRETT MICHAEL G. — CEO, Director | Tax withholding (F): 10,404 @ $24.73 | EDGAR |
| 2026-08-18 | 4 | Buckley Sean Patrick — See Remarks | Tax withholding (F): 11,715 @ $24.73 · Sale (S): 8,271 @ $24.31 · Sale (S): 2,759 @ $25 | EDGAR |
| 2026-08-14 | 4 | Day David — CHIEF FINANCIAL OFFICER | Gift (G): 26,258 @ $0 | EDGAR |
| 2026-08-12 | 4 | Gephart Brian — CHIEF ACCOUNTING OFFICER | Sale (S): 12,479 @ $24.68 | EDGAR |
| 2026-08-12 | 4 | Lam Rachel — Director | Sale (S): 10,000 @ $24.16 | EDGAR |
| 2026-08-12 | 4 | Caine Paul — Director | Sale (S): 5,000 @ $24.35 | EDGAR |
| 2026-08-07 | 4 | Buckley Sean Patrick — See Remarks | Option exercise (M): 28,703 @ $13.90 · Sale (S): 47,942 @ $25.09 · Sale (S): 19,237 @ $23 · Option exercise (M): 28,703 (derivative) @ $0 | EDGAR |
| 2026-08-07 | 4 | Knopper Douglas S — Director | Sale (S): 37,337 @ $22.72 | EDGAR |
| 2026-08-07 | 4 | Buonasera David — CHIEF TECHNOLOGY OFFICER | Sale (S): 4,176 @ $22.81 · Sale (S): 2,602 @ $24 · Sale (S): 871 @ $25 | EDGAR |
| 2026-08-07 | 4 | Evans Katie Seitz — See Remarks | Option exercise (M): 20,000 @ $5.16 · Sale (S): 20,000 @ $24 · Option exercise (M): 20,000 (derivative) @ $0 | EDGAR |
| 2026-08-07 | 4 | BARRETT MICHAEL G. — CEO, Director | Option exercise (M): 293,968 @ $5.80 · Sale (S): 293,968 @ $22.72 · Option exercise (M): 293,968 (derivative) @ $0 | EDGAR |
| 2026-07-17 | 4 | BARRETT MICHAEL G. — CEO, Director | Option exercise (M): 38,596 @ $5.80 · Sale (S): 38,596 @ $20.35 · Option exercise (M): 38,596 (derivative) @ $0 | EDGAR |
| 2026-07-14 | 4 | Caine Paul — Director | Sale (S): 5,000 @ $20.64 | EDGAR |
| 2026-07-09 | 4 | Buonasera David — CHIEF TECHNOLOGY OFFICER | Sale (S): 1,224 @ $21 | EDGAR |
| 2026-07-09 | 4 | Buckley Sean Patrick — See Remarks | Sale (S): 19,233 @ $21.03 | EDGAR |
| 2026-07-02 | 4 | Buonasera David — CHIEF TECHNOLOGY OFFICER | Sale (S): 9,376 @ $20 | EDGAR |
| 2026-07-01 | 4 | BARRETT MICHAEL G. — CEO, Director | Option exercise (M): 75,000 @ $5.80 · Sale (S): 75,000 @ $19.50 · Option exercise (M): 75,000 (derivative) @ $0 | EDGAR |
| 2026-06-18 | 4 | Buckley Sean Patrick — See Remarks | Sale (S): 19,233 @ $19 | EDGAR |
| 2026-06-17 | 4 | Buonasera David — CHIEF TECHNOLOGY OFFICER | Sale (S): 1,057 @ $17 · Sale (S): 11,233 @ $18 · Sale (S): 1,409 @ $19 | EDGAR |
| 2026-06-17 | 4 | Knopper Douglas S — Director | Sale (S): 37,337 @ $18.10 | EDGAR |
| 2026-06-17 | 4 | BARRETT MICHAEL G. — CEO, Director | Option exercise (M): 178,596 @ $5.80 · Sale (S): 178,596 @ $16.59 · Option exercise (M): 100,000 @ $5.80 · Sale (S): 100,000 @ $17.50 · Option exercise (M): 178,596 (derivative) @ $0 · Option exercise (M): 100,000 (derivative) @ $0 | EDGAR |
| 2026-06-10 | 4 | Yu Diane — Director | Grant/award (A): 13,798 @ $0 | EDGAR |
| 2026-06-10 | 4 | Spillane Robert F — Director | Grant/award (A): 13,798 @ $0 | EDGAR |
| 2026-06-10 | 4 | Harden Sarah Patricia — Director | Grant/award (A): 13,798 @ $0 | EDGAR |
| 2026-06-10 | 4 | Lam Rachel — Director | Grant/award (A): 13,798 @ $0 | EDGAR |
| 2026-06-10 | 4 | PEARSON DAVID T. — Director | Grant/award (A): 13,798 @ $0 · Sale (S): 10,766 @ $15.65 | EDGAR |
| 2026-06-10 | 4 | Caine Paul — Director | Grant/award (A): 13,798 @ $0 | EDGAR |
| 2026-06-10 | 4 | Knopper Douglas S — Director | Grant/award (A): 13,798 @ $0 · Sale (S): 10,766 @ $15.73 | EDGAR |
| 2026-06-10 | 4 | Rossman James — Director | Grant/award (A): 13,798 @ $0 | EDGAR |
| 2026-06-03 | 4 | Buonasera David — CHIEF TECHNOLOGY OFFICER | Sale (S): 1,409 @ $15 | EDGAR |
| 2026-05-21 | 4 | Spillane Robert F — Director | Sale (S): 10,000 @ $13.33 | EDGAR |
| 2026-05-19 | 4 | Evans Katie Seitz — President, Operations | Tax withholding (F): 11,204 @ $12.82 | EDGAR |
| 2026-05-19 | 4 | Day David — CHIEF FINANCIAL OFFICER | Tax withholding (F): 14,170 @ $12.82 | EDGAR |
| 2026-05-19 | 4 | BARRETT MICHAEL G. — CEO, Director | Tax withholding (F): 10,404 @ $12.82 | EDGAR |
Recent 8-K events — MAGNITE, INC.
| Filed | Form | Items reported | Source |
|---|---|---|---|
| 2026-09-21 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-08-05 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-06-11 | 8-K | 5.07 — Submission of Matters to a Vote of Security Holders | EDGAR |
| 2026-05-06 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-04-20 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers 7.01 — Regulation FD Disclosure 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-04-10 | 8-K | 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers | EDGAR |
| 2026-02-25 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2025-11-05 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2025-09-16 | 8-K | 7.01 — Regulation FD Disclosure 8.01 — Other Events 9.01 — Financial Statements and Exhibits | EDGAR |
| 2025-09-05 | 8-K | 1.01 — Entry into a Material Definitive Agreement | EDGAR |
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