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Michael G. Barrett

MGNI
CEO · MAGNITE, INC. · CIK 0001100612
FILING MIX · LIFETIME32%/68%
BUYS
31
SELLS
66
TOTAL VALUE
$49.66M
COMPANIES
3
ACTIVE SINCE
Jan 2020
HOLDINGS NOW
2,063,981
AVG SELL PX
$15.45
TRADE KIND
SHOWING 97 / 97
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
31 backtested trades · 8 horizons · 13 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Michael G. Barrett, 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
7d31+54.84%+3.71%+0.59%+3.12%+0.63%1.51
14d31+41.94%+5.07%+1.28%+3.79%+0.54%1.23
30d31+45.16%+6.30%+2.02%+4.27%-0.02%1.25
60d31+51.61%+6.41%+3.29%+3.12%-0.36%0.47
90d31+51.61%+13.86%+5.83%+8.03%-10.58%0.53
180d31+64.52%-6.97%+7.70%-14.68%-23.04%-2.34
1y31(2 pending)+65.52%-5.91%+16.34%-22.25%-31.47%—
2y31(11 pending)+45.00%+2.19%+25.52%-23.32%-20.23%—
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 · 403,074 shares · as of Jun 29, 2026
0400,420800,8391,201,2591,601,678202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
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 · 31 buys / 66 sellsCOVERAGE · 26 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
75,000$19.50$1.46M403,074Jun 29, 2026Jul 1, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
75,000——332,564Jun 29, 2026Jul 1, 2026 ↗View →
MGNI
MAGNITE, INC.
PURCHASE
CEO
75,000$5.80$435.0K478,074Jun 29, 2026Jul 1, 2026 ↗View →
MGNI
MAGNITE, INC.
PURCHASE
CEO
100,000$5.80$580.0K503,074Jun 16, 2026Jun 17, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
100,000——407,564Jun 16, 2026Jun 17, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
100,000$17.50$1.75M403,074Jun 16, 2026Jun 17, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
178,596$16.59$2.96M403,074Jun 15, 2026Jun 17, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
178,596——507,564Jun 15, 2026Jun 17, 2026 ↗View →
MGNI
MAGNITE, INC.
PURCHASE
CEO
178,596$5.80$1.04M581,670Jun 15, 2026Jun 17, 2026 ↗View →
OUT
OUTFRONT MEDIA INC.
PURCHASEGRANT
Stock grant
5,918——5,918Jun 3, 2026Jun 4, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
10,404$12.82$133.4K403,074May 15, 2026May 19, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
23,549$11.70$275.5K412,162Feb 15, 2026Feb 18, 2026 ↗View →
MGNI
MAGNITE, INC.
PURCHASE
CEO
213,750——545,453Jan 9, 2026Jan 12, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
213,750——0Jan 9, 2026Jan 12, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
109,742$16.17$1.77M435,711Jan 9, 2026Jan 12, 2026 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
90,909——90,909Jan 1, 2026Jan 5, 2026 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
94,044——331,703Jan 1, 2026Jan 5, 2026 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
122,864——122,864Jan 1, 2026Jan 5, 2026 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
12,198$14.15$172.6K237,659Nov 15, 2025Nov 18, 2025 ↗View →
OUT
OUTFRONT MEDIA INC.
PURCHASEGRANT
Stock grant
6,047——6,047Sep 18, 2025Sep 22, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
35,951$23.85$857.4K249,857Aug 18, 2025Aug 20, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
70,900$23.27$1.65M285,808Jul 15, 2025Jul 17, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
300,000$20.01$6.00M356,708Jun 24, 2025Jun 26, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
30,000$19.00$570.0K656,708Jun 18, 2025Jun 18, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
45,000$17.76$799.2K686,708Jun 16, 2025Jun 18, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
13,086$15.88$207.8K731,708May 15, 2025May 16, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
26,499$20.00$530.0K743,217Feb 15, 2025Feb 19, 2025 ↗View →
MGNI
MAGNITE, INC.
PURCHASE
CEO
108,360——825,391Feb 5, 2025Feb 7, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
55,675$17.97$1.00M769,716Feb 5, 2025Feb 7, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
86,806——0Feb 5, 2025Feb 7, 2025 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
82,117——717,031Jan 9, 2025Jan 13, 2025 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
107,497——107,497Jan 9, 2025Jan 13, 2025 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
81,374——81,374Jan 9, 2025Jan 13, 2025 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
147,996$17.52$2.59M634,914Dec 4, 2024Dec 6, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
27,004$17.63$476.1K782,910Nov 25, 2024Nov 27, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
9,638$15.85$152.8K909,914Nov 15, 2024Nov 19, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
100,000$16.14$1.61M809,914Nov 15, 2024Nov 19, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
25,000$15.00$375.0K919,552Nov 11, 2024Nov 13, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
75,000$12.63$947.3K944,552Aug 15, 2024Aug 16, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
32,941$12.51$412.1K1,019,552Aug 15, 2024Aug 16, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
100,000$15.00$1.50M1,052,493Jul 15, 2024Jul 17, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
75,000$9.02$676.5K1,152,493May 15, 2024May 17, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
10,441$9.80$102.3K1,224,221May 15, 2024May 17, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
75,000$11.21$840.8K1,234,662Mar 15, 2024Mar 18, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
20,400$9.74$198.7K1,309,392Feb 15, 2024Feb 16, 2024 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
169,173——169,173Jan 2, 2024Jan 4, 2024 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
121,951——1,329,792Jan 2, 2024Jan 4, 2024 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
129,870——129,870Jan 2, 2024Jan 4, 2024 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
75,000$7.80$585.0K1,219,203Nov 15, 2023Nov 17, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
11,362$7.89$89.6K1,207,841Nov 15, 2023Nov 17, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
35,869$8.31$298.1K1,294,203Aug 16, 2023Aug 18, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
75,000$8.52$639.0K1,330,072Aug 15, 2023Aug 17, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE10b5-1
10b5-1 plan
75,000$11.69$876.8K1,430,072May 31, 2023Jun 2, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
24,679$10.88$268.5K1,505,072May 16, 2023May 18, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
69,743$9.05$631.2K1,527,780Apr 4, 2023Apr 6, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
138,014——0Apr 4, 2023Apr 6, 2023 ↗View →
MGNI
MAGNITE, INC.
PURCHASE
CEO
138,014——1,597,523Apr 4, 2023Apr 6, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
75,000$8.39$629.3K1,459,509Mar 15, 2023Mar 17, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
17,678$13.27$234.6K1,534,509Feb 15, 2023Feb 17, 2023 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
121,951——1,552,187Jan 1, 2023Jan 4, 2023 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
169,173——169,173Jan 1, 2023Jan 4, 2023 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
129,870——129,870Jan 1, 2023Jan 4, 2023 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
67,786$11.55$782.9K1,437,450Nov 15, 2022Nov 17, 2022 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
7,214$11.86$85.6K1,430,236Nov 15, 2022Nov 17, 2022 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
29,283$11.47$335.9K1,505,236Nov 15, 2022Nov 17, 2022 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
6,949$9.80$68.1K1,534,519Aug 15, 2022Aug 17, 2022 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
32,422$10.59$343.3K1,541,468May 15, 2022May 17, 2022 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
4,207$13.95$58.7K1,572,761Feb 15, 2022Feb 16, 2022 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
86,806——86,806Feb 1, 2022Feb 3, 2022 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
138,313——1,576,968Feb 1, 2022Feb 3, 2022 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
172,216——172,216Feb 1, 2022Feb 3, 2022 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
40,713$22.50$916.0K1,438,655Nov 15, 2021Nov 17, 2021 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
379,635——379,635Aug 26, 2021Aug 30, 2021 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
136,939——1,479,368Aug 26, 2021Aug 30, 2021 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
65,271$27.81$1.82M1,358,499Aug 16, 2021Aug 18, 2021 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
9,729$28.47$277.0K1,348,770Aug 16, 2021Aug 18, 2021 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
6,341$26.82$170.1K1,342,429Aug 16, 2021Aug 18, 2021 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
105,138$25.98$2.73M1,423,770May 17, 2021May 19, 2021 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
16,933$40.28$682.1K1,532,963Apr 5, 2021Apr 7, 2021 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
518$43.51$22.5K1,526,678Apr 5, 2021Apr 7, 2021 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
2,841$42.39$120.4K1,527,196Apr 5, 2021Apr 7, 2021 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
51,782$39.48$2.04M1,549,896Apr 5, 2021Apr 7, 2021 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
2,926$41.51$121.5K1,530,037Apr 5, 2021Apr 7, 2021 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
41,742——1,601,678Apr 1, 2021Apr 5, 2021 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
26,291——26,291Apr 1, 2021Apr 5, 2021 ↗View →
MGNI
MAGNITE, INC.
PURCHASEGRANT
Stock grant
54,358——54,358Apr 1, 2021Apr 5, 2021 ↗View →
MGNI
MAGNITE, INC.
SALE
CEO
95,053$11.06$1.05M1,559,936Nov 16, 2020Nov 18, 2020 ↗View →
RUBI
RUBICO INC.
SALE
CEO
48,174$5.13$247.1K1,661,054May 20, 2020May 20, 2020 ↗View →
RUBI
RUBICO INC.
SALE
CEO
54,239$5.13$278.2K1,654,989May 20, 2020Jun 5, 2020 ↗View →
RUBI
RUBICO INC.
SALE
CEO
38,630$5.23$202.0K1,709,228May 19, 2020Jun 5, 2020 ↗View →
RUBI
RUBICO INC.
SALE
CEO
38,630$5.23$202.0K1,709,228May 19, 2020May 20, 2020 ↗View →
RUBI
RUBICO INC.
SALE
CEO
41,409$5.43$224.9K1,747,858May 18, 2020Jun 5, 2020 ↗View →
RUBI
RUBICO INC.
SALE
CEO
41,409$5.43$224.9K1,747,858May 18, 2020May 20, 2020 ↗View →
RUBI
RUBICO INC.
PURCHASEGRANT
Stock grant
175,992——1,786,177Apr 1, 2020Apr 3, 2020 ↗View →
RUBI
RUBICO INC.
PURCHASEGRANT
Stock grant
146,341——146,341Apr 1, 2020Apr 3, 2020 ↗View →
RUBI
RUBICO INC.
PURCHASEGRANT
Stock grant
231,568——231,568Apr 1, 2020Apr 3, 2020 ↗View →
RUBI
RUBICO INC.
SALE
President and CEO
30,274$10.45$316.4K1,610,185Jan 16, 2020Jan 21, 2020 ↗View →
Other insiders · MGNI
Loading peer insiders…
About this filer
CIK 0001100612
ROLE
CEO
PRIMARY
MGNI
COMPANIES
3
ACTIVE SINCE
Jan 2020
MARKETPEEL · /INSIDER/0001100612DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
FREE · DAILY · 6 AM ET

The morning brief, before the bell.

One short email. Insider buys, congressional trades, and plain-English analysis.

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