MarketPeel
Insider Trading Intelligence
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GH

Greta J. Harris

MKL
DIRECTOR · MARKEL GROUP INC. · CIK 0001857626
FILING MIX · LIFETIME42%/58%
BUYS
8
SELLS
11
TOTAL VALUE
$1.19M
COMPANIES
1
ACTIVE SINCE
May 2021
HOLDINGS NOW
686
AVG SELL PX
$1,686.26
TRADE KIND
SHOWING 19 / 19
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
10 backtested trades · 8 horizons · 1 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Greta J. Harris, 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
7d10+40.00%+0.90%-0.39%+1.29%+1.83%—
14d10+90.00%+0.23%+1.30%-1.07%-1.91%—
30d10+50.00%-1.04%+1.59%-2.63%-4.34%—
60d10+70.00%-0.31%+3.79%-4.10%-4.12%—
90d10+90.00%-2.26%+5.04%-7.30%-8.75%—
180d10+40.00%+5.64%+12.33%-6.68%-7.55%—
1y10+30.00%+10.19%+18.86%-8.67%-5.08%—
2y10(1 pending)+22.22%+23.49%+46.61%-23.12%-27.46%—
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
MKL · 686 shares · as of May 22, 2026
019038056975920222023202420252026SHARES 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 · 8 buys / 11 sellsCOVERAGE · 21 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
MKL
MARKEL GROUP INC.
SALE
35$1,846.12$64.6K686May 22, 2026May 27, 2026 ↗View →
MKL
MARKEL GROUP INC.
SALE
14$1,847.36$25.9K672May 22, 2026May 27, 2026 ↗View →
MKL
MARKEL GROUP INC.
SALE
27$1,848.83$49.9K645May 22, 2026May 27, 2026 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
89——721May 20, 2026May 22, 2026 ↗View →
MKL
MARKEL GROUP INC.
SALE
90$1,861.44$167.5K632May 23, 2025May 27, 2025 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
88——722May 21, 2025May 23, 2025 ↗View →
MKL
MARKEL GROUP INC.
SALE
2$1,621.26$3.2K666May 24, 2024May 28, 2024 ↗View →
MKL
MARKEL GROUP INC.
SALE
58$1,620.42$94.0K698May 24, 2024May 28, 2024 ↗View →
MKL
MARKEL GROUP INC.
SALE
27$1,620.50$43.8K671May 24, 2024May 28, 2024 ↗View →
MKL
MARKEL GROUP INC.
SALE
3$1,620.60$4.9K668May 24, 2024May 28, 2024 ↗View →
MKL
MARKEL GROUP INC.
SALE
32$1,621.83$51.9K634May 24, 2024May 28, 2024 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
100——756May 22, 2024May 23, 2024 ↗View →
MKL
MARKEL GROUP INC.
SALE
101$1,491.86$150.7K658Aug 18, 2023Aug 22, 2023 ↗View →
MKL
MARKEL GROUP INC.
SALE
2$1,492.67$3.0K656Aug 18, 2023Aug 22, 2023 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
122——759May 17, 2023May 18, 2023 ↗View →
MKL
MARKEL GROUP INC.
PURCHASE
3$1,327.01$4.0K637Feb 17, 2023Feb 17, 2023 ↗View →
MKL
MARKEL GROUP INC.
PURCHASE
397$1,328.00$527.2K634Feb 17, 2023Feb 17, 2023 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
129——237May 11, 2022May 13, 2022 ↗View →
MKL
MARKEL GROUP INC.
PURCHASEGRANT
Stock grant
103——108May 10, 2021May 12, 2021 ↗View →
Other insiders · MKL
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About this filer
CIK 0001857626
ROLE
Director
PRIMARY
MKL
COMPANIES
1
ACTIVE SINCE
May 2021
MARKETPEEL · /INSIDER/0001857626DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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