MarketPeel
Insider Trading Intelligence
DK

Douglas S. Knopper

MGNI
DIRECTOR · MAGNITE, INC. · CIK 0001350876
FILING MIX · LIFETIME50%/50%
BUYS
8
SELLS
8
TOTAL VALUE
$1.58M
COMPANIES
2
ACTIVE SINCE
Apr 2020
HOLDINGS NOW
228,694
AVG SELL PX
$23.14
TRADE KIND
SHOWING 16 / 16
Trades · vs SPY
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Performance · forward returns vs SPY
6 backtested trades · 8 horizonsHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Douglas S. Knopper, 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
7d6+100.00%-5.65%+0.55%-6.20%-2.76%
14d6+100.00%-8.18%+1.79%-9.97%-12.94%
30d6+100.00%-9.01%+2.05%-11.05%-15.40%
60d6+100.00%-21.88%+3.88%-25.76%-32.80%
90d6+100.00%-16.24%+5.07%-21.31%-24.06%
180d6+100.00%-37.30%+7.79%-45.09%-37.15%
1y6+100.00%-68.47%+5.14%-73.61%-78.36%
2y6+100.00%-71.46%+3.59%-75.05%-81.36%
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 · 125,810 shares · as of Jun 16, 2026
043,47886,957130,435173,913202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 8 buys / 8 sellsCOVERAGE · 25 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
37,337$18.10$675.8K125,810Jun 16, 2026Jun 17, 2026View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
10,766$15.73$169.3K163,147Jun 10, 2026Jun 10, 2026View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
13,798173,913Jun 8, 2026Jun 10, 2026View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
10,766160,115Jun 5, 2025Jun 6, 2025View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
14,061149,349Jun 12, 2024Jun 13, 2024View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
13,743135,288Jun 14, 2023Jun 16, 2023View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
16,489121,545Jun 7, 2022Jun 9, 2022View →
MGNI
MAGNITE, INC.
SALE
9,010$32.68$294.4K106,246Jul 9, 2021Jul 13, 2021View →
MGNI
MAGNITE, INC.
SALE
1,190$33.61$40.0K105,056Jul 9, 2021Jul 13, 2021View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
3,936115,256Jun 28, 2021Jun 30, 2021View →
MGNI
MAGNITE, INC.
SALE
4,923$39.55$194.7K116,397Apr 5, 2021Apr 7, 2021View →
MGNI
MAGNITE, INC.
SALE
200$41.53$8.3K111,820Apr 5, 2021Apr 7, 2021View →
MGNI
MAGNITE, INC.
SALE
4,377$40.32$176.5K112,020Apr 5, 2021Apr 7, 2021View →
MGNI
MAGNITE, INC.
SALE
500$42.55$21.3K111,320Apr 5, 2021Apr 7, 2021View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
18,436121,320Jul 8, 2020Jul 16, 2020View →
RUBI
RUBICO INC.
PURCHASEGRANT
Stock grant
102,884102,884Apr 1, 2020Apr 3, 2020View →
Other insiders · MGNI
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About this filer
CIK 0001350876
ROLE
Director
PRIMARY
MGNI
COMPANIES
2
ACTIVE SINCE
Apr 2020
MARKETPEEL · /INSIDER/0001350876DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
FREE · DAILY · 6 AM ET

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