Buckley Sean Patrick — SEC Form 4 filings
SEC reporting owner CIK 1865116. 26 Form 4 filings on record with FilingPulse; latest filed 2026-08-18.
Transaction summary — filings shown
Covers all 26 filings on record, filed 2024-02-16 to 2026-08-18. 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): 25 legs across 18 filings — 323,387 shares, $6,413,848 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 19.
- Largest priced transaction: sale of 47,942 shares @ $25.09 ($1,202,865) in MAGNITE, INC., filed 2026-08-07.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| MAGNITE, INC. (MGNI) | See Remarks | 26 | — | 25 legs · 323,387 sh · $6,413,848 | 19 |
Form 4 filings — Buckley Sean Patrick
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-08-18 | 4 | MAGNITE, INC. (MGNI) | Tax withholding (F): 11,715 @ $24.73 · Sale (S): 8,271 @ $24.31 · Sale (S): 2,759 @ $25 | EDGAR |
| 2026-08-07 | 4 | MAGNITE, INC. (MGNI) | 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 |
| 2026-07-09 | 4 | MAGNITE, INC. (MGNI) | Sale (S): 19,233 @ $21.03 | EDGAR |
| 2026-06-18 | 4 | MAGNITE, INC. (MGNI) | Sale (S): 19,233 @ $19 | EDGAR |
| 2026-05-19 | 4 | MAGNITE, INC. (MGNI) | Tax withholding (F): 12,019 @ $12.82 | EDGAR |
| 2026-02-18 | 4 | MAGNITE, INC. (MGNI) | Tax withholding (F): 26,942 @ $11.70 | EDGAR |
| 2026-01-12 | 4 | MAGNITE, INC. (MGNI) | Option exercise (M): 64,125 @ $0 · Tax withholding (F): 30,369 @ $16.17 · Option exercise (M): 64,125 (derivative) @ $0 | EDGAR |
| 2026-01-05 | 4 | MAGNITE, INC. (MGNI) | Grant/award (A): 127,273 @ $0 · Grant/award (A): 42,757 (derivative) @ $0 | EDGAR |
| 2025-11-26 | 4 | MAGNITE, INC. (MGNI) | Sale (S): 2,213 @ $14.50 | EDGAR |
| 2025-11-18 | 4 | MAGNITE, INC. (MGNI) | Tax withholding (F): 11,642 @ $14.15 · Sale (S): 4,426 @ $13.36 | EDGAR |
| 2025-09-10 | 4 | MAGNITE, INC. (MGNI) | Sale (S): 20,000 @ $25.56 · Sale (S): 20,000 @ $24.61 | EDGAR |
| 2025-08-20 | 4 | MAGNITE, INC. (MGNI) | Sale (S): 10,886 @ $23.85 · Sale (S): 9,315 @ $23.42 | EDGAR |
| 2025-05-16 | 4 | MAGNITE, INC. (MGNI) | Tax withholding (F): 15,049 @ $15.88 · Sale (S): 9,692 @ $15.73 | EDGAR |
| 2025-02-21 | 4 | MAGNITE, INC. (MGNI) | Sale (S): 10,527 @ $19.13 | EDGAR |
| 2025-02-19 | 4 | MAGNITE, INC. (MGNI) | Tax withholding (F): 27,444 @ $20 | EDGAR |
| 2025-02-07 | 4 | MAGNITE, INC. (MGNI) | Sale (S): 18,693 @ $20 | EDGAR |
| 2025-01-13 | 4 | MAGNITE, INC. (MGNI) | Grant/award (A): 123,479 @ $0 · Grant/award (A): 41,566 (derivative) @ $0 | EDGAR |
| 2024-11-19 | 4 | MAGNITE, INC. (MGNI) | Tax withholding (F): 10,133 @ $15.85 · Sale (S): 10,001 @ $15.60 | EDGAR |
| 2024-11-13 | 4 | MAGNITE, INC. (MGNI) | Sale (S): 2,623 @ $14.50 · Sale (S): 2,619 @ $15.50 | EDGAR |
| 2024-08-21 | 4 | MAGNITE, INC. (MGNI) | Sale (S): 2,623 @ $12.53 · Sale (S): 2,623 @ $13.50 | EDGAR |
| 2024-08-16 | 4 | MAGNITE, INC. (MGNI) | Tax withholding (F): 9,646 @ $12.51 | EDGAR |
| 2024-07-17 | 4 | MAGNITE, INC. (MGNI) | Sale (S): 19,607 @ $14.50 · Sale (S): 19,604 @ $15.50 | EDGAR |
| 2024-06-07 | 4 | MAGNITE, INC. (MGNI) | Sale (S): 21,653 @ $13.50 | EDGAR |
| 2024-05-29 | 4 | MAGNITE, INC. (MGNI) | Sale (S): 2,682 @ $12.50 | EDGAR |
| 2024-05-17 | 4 | MAGNITE, INC. (MGNI) | Tax withholding (F): 9,407 @ $9.80 · Sale (S): 16,925 @ $12.50 | EDGAR |
| 2024-02-16 | 4 | MAGNITE, INC. (MGNI) | Tax withholding (F): 24,110 @ $9.74 | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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