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SB

Sean Patrick Buckley

MGNI
PRESIDENT, REVENUE · MAGNITE, INC. · CIK 0001865116
FILING MIX · LIFETIME26%/74%
BUYS
14
SELLS
40
TOTAL VALUE
$7.35M
COMPANIES
1
ACTIVE SINCE
Jun 2021
HOLDINGS NOW
373,514
AVG SELL PX
$15.72
TRADE KIND
SHOWING 54 / 54
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
22 backtested trades · 8 horizons · 22 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Sean Patrick Buckley, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d22+54.55%+0.59%+0.10%+0.50%+0.61%—
14d22+36.36%+0.57%+0.32%+0.25%+2.04%—
30d22+45.45%-1.58%+1.29%-2.86%+0.21%—
60d22+68.18%-5.02%+1.10%-6.11%-5.67%—
90d22+63.64%-7.50%+3.60%-11.10%-15.03%—
180d22+59.09%-2.45%+6.99%-9.05%-2.08%—
1y22(6 pending)+50.00%+13.83%+16.84%-3.01%-4.97%—
2y22(16 pending)+0.00%+46.71%+44.60%+2.11%-23.42%—
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
MGNI · 373,514 shares · as of Jun 17, 2026
0115,078230,155345,233460,31020222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 14 buys / 40 sellsCOVERAGE · 21 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
19,233$19.00$365.4K373,514Jun 17, 2026Jun 18, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE
President, Revenue
12,019$12.82$154.1K392,747May 15, 2026May 19, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE
President, Revenue
26,942$11.70$315.2K402,999Feb 15, 2026Feb 18, 2026 ↗View →
MGNI
MAGNITE, INC.
PURCHASE
President, Revenue
64,125——460,310Jan 9, 2026Jan 12, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE
President, Revenue
30,369$16.17$491.1K429,941Jan 9, 2026Jan 12, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE
President, Revenue
64,125——0Jan 9, 2026Jan 12, 2026 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
127,273——396,185Jan 1, 2026Jan 5, 2026 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
42,757——42,757Jan 1, 2026Jan 5, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
2,213$14.50$32.1K268,912Nov 24, 2025Nov 26, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
4,426$13.36$59.1K271,125Nov 18, 2025Nov 18, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE
President, Revenue
11,642$14.15$164.7K275,551Nov 15, 2025Nov 18, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE
President, Revenue
20,000$24.61$492.2K287,193Sep 9, 2025Sep 10, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE
President, Revenue
20,000$25.56$511.2K307,193Sep 8, 2025Sep 10, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
9,315$23.42$218.2K327,193Aug 19, 2025Aug 20, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
10,886$23.85$259.6K336,508Aug 18, 2025Aug 20, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
9,692$15.73$152.5K347,394May 16, 2025May 16, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE
President, Revenue
15,049$15.88$239.0K357,086May 15, 2025May 16, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
10,527$19.13$201.4K370,558Feb 19, 2025Feb 21, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE
President, Revenue
27,444$20.00$548.9K381,085Feb 15, 2025Feb 19, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
18,693$20.00$373.9K408,529Feb 7, 2025Feb 7, 2025 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
123,479——427,222Jan 9, 2025Jan 13, 2025 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
41,566——41,566Jan 9, 2025Jan 13, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
10,001$15.60$156.0K303,743Nov 18, 2024Nov 19, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE
CHIEF REVENUE OFFICER
10,133$15.85$160.6K313,744Nov 15, 2024Nov 19, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
2,619$15.50$40.6K323,877Nov 11, 2024Nov 13, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
2,623$14.50$38.0K326,496Nov 11, 2024Nov 13, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
2,623$13.50$35.4K329,119Aug 20, 2024Aug 21, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
2,623$12.53$32.9K331,742Aug 19, 2024Aug 21, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE
CHIEF REVENUE OFFICER
9,646$12.51$120.7K334,365Aug 15, 2024Aug 16, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
19,604$15.50$303.9K344,011Jul 16, 2024Jul 17, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
19,607$14.50$284.3K363,615Jul 15, 2024Jul 17, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
21,653$13.50$292.3K383,222Jun 5, 2024Jun 7, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
2,682$12.50$33.5K404,875May 24, 2024May 29, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
16,925$12.50$211.6K407,557May 16, 2024May 17, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE
CHIEF REVENUE OFFICER
9,407$9.80$92.2K421,210May 15, 2024May 17, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE
CHIEF REVENUE OFFICER
24,110$9.74$234.8K430,617Feb 15, 2024Feb 16, 2024 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
142,276——454,727Jan 2, 2024Jan 4, 2024 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
50,752——50,752Jan 2, 2024Jan 4, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE
Chief Revenue Officer
5,078$7.89$40.1K312,451Nov 15, 2023Nov 17, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE
Chief Revenue Officer
5,273$8.31$43.8K317,529Aug 16, 2023Aug 18, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE
Chief Revenue Officer
12,219$12.99$158.7K322,802Jun 2, 2023Jun 6, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE
Chief Revenue Officer
5,640$10.88$61.4K335,021May 16, 2023May 18, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE
Chief Revenue Officer
15,401$13.27$204.4K336,205Feb 15, 2023Feb 17, 2023 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
142,276——351,606Jan 1, 2023Jan 4, 2023 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
50,752——50,752Jan 1, 2023Jan 4, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE
Chief Revenue Officer
1,632$11.47$18.7K209,330Nov 15, 2022Nov 17, 2022 ↗View →
MGNI
MAGNITE, INC.
SALE
Chief Revenue Officer
1,632$9.80$16.0K210,962Aug 15, 2022Aug 17, 2022 ↗View →
MGNI
MAGNITE, INC.
SALE
Chief Revenue Officer
11,185$10.70$119.7K212,594Jun 1, 2022Jun 3, 2022 ↗View →
MGNI
MAGNITE, INC.
SALE
Chief Revenue Officer
6,525$10.59$69.1K223,779May 15, 2022May 17, 2022 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
86,108——86,108Feb 1, 2022Feb 3, 2022 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
121,024——230,304Feb 1, 2022Feb 3, 2022 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
43,788——43,788Jun 1, 2021Jun 3, 2021 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
58,843——58,843Jun 1, 2021Jun 3, 2021 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
50,437——109,280Jun 1, 2021Jun 3, 2021 ↗View →
Other insiders · MGNI
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About this filer
CIK 0001865116
ROLE
President, Revenue
PRIMARY
MGNI
COMPANIES
1
ACTIVE SINCE
Jun 2021
MARKETPEEL · /INSIDER/0001865116DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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