Company · CIK 0001595974 · SIC 7370 — Services-Computer Programming, Data Processing, Etc. · Nasdaq
MAGNITE, INC. · MGNI
Insider activity reported against this company. All insider holders · On EDGAR ↗
Reported at this company — common stock
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 17, 2026 SForm 4 → | Sep 18, 4:06 pm EDT | Paul CaineDirector | 7,500 | $26.50 | $198,750 | 137,401 | −5.18% | 10b5-1 |
| Sep 17, 2026 SForm 4 → | Sep 18, 4:05 pm EDT | Douglas S KnopperDirector | 37,337 | $26.28 | $981,216 | 51,136 | −42.2% | 10b5-1 |
| Sep 14, 2026 SForm 4 → | Sep 16, 4:23 pm EDT | David BuonaseraCHIEF TECHNOLOGY OFFICER | 1,165 | $24.00 | $27,960 | 245,155 | −0.47% | 10b5-1 |
| Sep 14, 2026 SForm 4 → | Sep 16, 4:20 pm EDT | Robert F SpillaneDirector | 10,363 | $23.76 | $246,225 | 57,715 | −15.2% | |
| Sep 14, 2026 MForm 4 → | Sep 16, 4:20 pm EDT | Robert F SpillaneDirector | 10,363 | $5.17 | $53,577 | 68,078 | — | |
| Sep 11, 2026 SForm 4 → | Sep 11, 4:19 pm EDT | Katie Seitz EvansSee Remarks | 13,997 | $24.00 | $335,928 | 441,800 | −3.07% | 10b5-1 |
| Sep 10, 2026 SForm 4 → | Sep 11, 4:15 pm EDT | Aaron SaltzCHIEF LEGAL OFFICER | 40,000 | $23.41 | $936,400 | 224,389 | −15.1% | 10b5-1 |
| Sep 10, 2026 SForm 4 → | Sep 11, 4:11 pm EDT | Paul CaineDirector | 5,000 | $23.53 | $117,650 | 144,901 | −3.34% | 10b5-1 |
| Sep 8, 2026 SForm 4 → | Sep 10, 4:39 pm EDT | Katie Seitz EvansSee Remarks | 43,385 | $23.59 | $1,023,301 | 455,797 | −8.69% | 10b5-1 |
| Sep 8, 2026 MForm 4 → | Sep 10, 4:39 pm EDT | Katie Seitz EvansSee Remarks | 13,546 | $5.16 | $69,897 | 499,182 | — | 10b5-1 |
| Sep 1, 2026 SForm 4 → | Sep 3, 4:56 pm EDT | David BuonaseraCHIEF TECHNOLOGY OFFICER | 6,414 | $23.68 | $151,864 | 246,320 | −2.54% | 10b5-1 |
| Aug 26, 2026 SForm 4 → | Aug 28, 6:36 pm EDT | Sarah Patricia HardenDirector | 48,986 | $23.57 | $1,154,585 | 114,751 | −29.9% | 10b5-1 |
| Aug 17, 2026 SForm 4 → | Aug 18, 4:14 pm EDT | Sean Patrick BuckleySee Remarks | 11,030 | $24.48 | $270,043 | 293,060 | −3.63% | 10b5-1 |
| Aug 15, 2026 FForm 4 → | Aug 18, 4:25 pm EDT | David BuonaseraCHIEF TECHNOLOGY OFFICER | 8,102 | $24.73 | $200,362 | 252,734 | — | |
| Aug 15, 2026 FForm 4 → | Aug 18, 4:23 pm EDT | Katie Seitz EvansSee Remarks | 11,204 | $24.73 | $277,075 | 485,636 | — | |
| Aug 15, 2026 FForm 4 → | Aug 18, 4:21 pm EDT | Aaron SaltzCHIEF LEGAL OFFICER | 5,627 | $24.73 | $139,156 | 264,389 | — | |
| Aug 15, 2026 FForm 4 → | Aug 18, 4:20 pm EDT | Brian GephartCHIEF ACCOUNTING OFFICER | 3,789 | $24.73 | $93,702 | 102,328 | — | |
| Aug 15, 2026 FForm 4 → | Aug 18, 4:19 pm EDT | Michael G. BarrettCEO, Director | 10,404 | $24.73 | $257,291 | 392,670 | — | |
| Aug 15, 2026 FForm 4 → | Aug 18, 4:17 pm EDT | David DayCHIEF FINANCIAL OFFICER | 14,170 | $24.73 | $350,424 | 452,861 | — | |
| Aug 15, 2026 FForm 4 → | Aug 18, 4:14 pm EDT | Sean Patrick BuckleySee Remarks | 11,715 | $24.73 | $289,712 | 304,090 | — | 10b5-1 |
| Aug 14, 2026 SForm 4 → | Aug 18, 4:16 pm EDT | Paul CaineDirector | 7,500 | $25.00 | $187,500 | 149,901 | −4.76% | 10b5-1 |
| Aug 13, 2026 GForm 4 → | Aug 14, 4:16 pm EDT | David DayCHIEF FINANCIAL OFFICER | 26,258 | — | — | 467,031 | — | |
| Aug 10, 2026 SForm 4 → | Aug 12, 4:54 pm EDT | Brian GephartCHIEF ACCOUNTING OFFICER | 12,479 | $24.68 | $307,982 | 106,117 | −10.5% | |
| Aug 10, 2026 SForm 4 → | Aug 12, 4:51 pm EDT | Rachel LamDirector | 10,000 | $24.16 | $241,600 | 230,620 | −4.16% | |
| Aug 10, 2026 SForm 4 → | Aug 12, 4:49 pm EDT | Paul CaineDirector | 5,000 | $24.35 | $121,750 | 157,401 | −3.08% | 10b5-1 |
| Aug 6, 2026 SForm 4 → | Aug 7, 5:14 pm EDT | Sean Patrick BuckleySee Remarks | 67,179 | $24.49 | $1,645,316 | 315,805 | −17.5% | 10b5-1 |
| Aug 6, 2026 MForm 4 → | Aug 7, 5:14 pm EDT | Sean Patrick BuckleySee Remarks | 28,703 | $13.90 | $398,972 | 382,984 | — | 10b5-1 |
| Aug 6, 2026 SForm 4 → | Aug 7, 5:10 pm EDT | Douglas S KnopperDirector | 37,337 | $22.72 | $848,297 | 88,473 | −29.7% | 10b5-1 |
| Aug 6, 2026 SForm 4 → | Aug 7, 5:09 pm EDT | David BuonaseraCHIEF TECHNOLOGY OFFICER | 7,649 | $23.46 | $179,478 | 260,836 | −2.85% | 10b5-1 |
| Aug 6, 2026 SForm 4 → | Aug 7, 5:06 pm EDT | Katie Seitz EvansSee Remarks | 20,000 | $24.00 | $480,000 | 496,840 | −3.87% | 10b5-1 |
| Aug 6, 2026 MForm 4 → | Aug 7, 5:06 pm EDT | Katie Seitz EvansSee Remarks | 20,000 | $5.16 | $103,200 | 516,840 | — | 10b5-1 |
| Aug 6, 2026 SForm 4 → | Aug 7, 5:00 pm EDT | Michael G. BarrettCEO, Director | 293,968 | $22.72 | $6,678,953 | 403,074 | −42.2% | 10b5-1 |
| Aug 6, 2026 MForm 4 → | Aug 7, 5:00 pm EDT | Michael G. BarrettCEO, Director | 293,968 | $5.80 | $1,705,014 | 697,042 | — | 10b5-1 |
| Jul 15, 2026 SForm 4 → | Jul 17, 5:00 pm EDT | Michael G. BarrettCEO, Director | 38,596 | $20.35 | $785,429 | 403,074 | −8.74% | 10b5-1 |
| Jul 15, 2026 MForm 4 → | Jul 17, 5:00 pm EDT | Michael G. BarrettCEO, Director | 38,596 | $5.80 | $223,857 | 441,670 | — | 10b5-1 |
| Jul 10, 2026 SForm 4 → | Jul 14, 5:50 pm EDT | Paul CaineDirector | 5,000 | $20.64 | $103,200 | 162,401 | −2.99% | 10b5-1 |
| Jul 7, 2026 SForm 4 → | Jul 9, 4:32 pm EDT | David BuonaseraCHIEF TECHNOLOGY OFFICER | 1,224 | $21.00 | $25,704 | 268,485 | −0.45% | 10b5-1 |
| Jul 7, 2026 SForm 4 → | Jul 9, 4:27 pm EDT | Sean Patrick BuckleySee Remarks | 19,233 | $21.03 | $404,470 | 354,281 | −5.15% | 10b5-1 |
| Jul 1, 2026 SForm 4 → | Jul 2, 7:07 pm EDT | David BuonaseraCHIEF TECHNOLOGY OFFICER | 9,376 | $20.00 | $187,520 | 269,709 | −3.36% | 10b5-1 |
| Jun 29, 2026 SForm 4 → | Jul 1, 4:49 pm EDT | Michael G. BarrettCEO, Director | 75,000 | $19.50 | $1,462,500 | 403,074 | −15.7% | 10b5-1 |
| Jun 29, 2026 MForm 4 → | Jul 1, 4:49 pm EDT | Michael G. BarrettCEO, Director | 75,000 | $5.80 | $435,000 | 478,074 | — | 10b5-1 |
Reported at this company — derivatives (options, RSUs, warrants)
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 14, 2026 MForm 4 → | Sep 16, 4:20 pm EDT | Robert F SpillaneDirector | 10,363 | — | — | 0 | — | |
| Sep 8, 2026 MForm 4 → | Sep 10, 4:39 pm EDT | Katie Seitz EvansSee Remarks | 13,546 | — | — | 0 | — | 10b5-1 |
| Aug 6, 2026 MForm 4 → | Aug 7, 5:14 pm EDT | Sean Patrick BuckleySee Remarks | 28,703 | — | — | 57,405 | — | 10b5-1 |
| Aug 6, 2026 MForm 4 → | Aug 7, 5:06 pm EDT | Katie Seitz EvansSee Remarks | 20,000 | — | — | 0 | — | 10b5-1 |
| Aug 6, 2026 MForm 4 → | Aug 7, 5:00 pm EDT | Michael G. BarrettCEO, Director | 293,968 | — | — | 0 | — | 10b5-1 |
| Jul 15, 2026 MForm 4 → | Jul 17, 5:00 pm EDT | Michael G. BarrettCEO, Director | 38,596 | — | — | 293,968 | — | 10b5-1 |
| Jun 29, 2026 MForm 4 → | Jul 1, 4:49 pm EDT | Michael G. BarrettCEO, Director | 75,000 | — | — | 332,564 | — | 10b5-1 |