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Buy MKL
Markel Stock Insider Power
Based on the 100 latest insides trades, we have calculated the insider power to be negative at -15.83. In total, the insiders bought 107.52M and sold 3.89M MKL shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.
Insider Power
|
-15.83 |
| ● Buy | 107.52M shares |
| ● Sell | 3.89M shares |
|
61% Buy Activity
Moderate Negative Correlation
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Historical Insider Trades
| Date | Type | Person | Role | Amount |
|---|---|---|---|---|
|
Dec 11, 2025 Sell |
Markel Steven A Director |
70 Value: $147.6K |
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|
Dec 11, 2025 Sell |
Markel Steven A Director |
120 Value: $253.8K |
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Dec 11, 2025 Sell |
Markel Steven A Director |
201 Value: $425.6K |
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Dec 11, 2025 Sell |
Markel Steven A Director |
51 Value: $108.2K |
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|
Dec 11, 2025 Sell |
Markel Steven A Director |
32 Value: $68.0K |
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|
Dec 11, 2025 Sell |
Markel Steven A Director |
75 Value: $159.5K |
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|
Dec 11, 2025 Sell |
Markel Steven A Director |
190 Value: $404.2K |
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Dec 11, 2025 Sell |
Markel Steven A Director |
10 Value: $21.3K |
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Dec 11, 2025 Sell |
Markel Steven A Director |
120 Value: $255.6K |
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|
Dec 02, 2025 Sell |
Costanzo Brian J. Chief Financial Officer |
22 Value: $44.8K |
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Dec 02, 2025 Sell |
Grinnan Richard Randolph SVP, Chief Legal Officer & Sec |
138 Value: $284.4K |
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|
Dec 02, 2025 Sell |
Wilson Simon CEO, Markel Insurance |
94 Value: $193.7K |
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|
Dec 02, 2025 Sell |
Gayner Thomas Sinnickson Chief Executive Officer |
37 Value: $75.5K |
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Dec 02, 2025 Sell |
Heaton Michael R EVP & Chief Operating Officer |
217 Value: $448.0K |
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Dec 02, 2025 Sell |
Crowley Andrew G. President, Markel Ventures |
65 Value: $133.5K |
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|
Nov 28, 2025 Sell |
Markel Steven A Director |
100 Value: $210.0K |
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Nov 26, 2025 Sell |
Markel Steven A Director |
70 Value: $147.0K |
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|
Nov 25, 2025 Sell |
Wilson Simon CEO, Markel Insurance |
75 Value: $155.5K |
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|
Nov 17, 2025 Sell |
Markel Steven A Director |
500 Value: $0 |
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|
Sep 30, 2025 Buy |
Costanzo Brian J. Chief Financial Officer |
2 Value: $3K |
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|
Aug 25, 2025 Sell |
Grandis Meade P. Cao And Controller |
75 Value: $148.8K |
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|
Aug 25, 2025 Sell |
Grandis Meade P. Cao And Controller |
75 Value: $148.8K |
||
|
Jul 15, 2025 Buy |
Crowley Andrew G. President, Markel Ventures |
6 Value: $10.0K |
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|
Jul 15, 2025 Buy |
Crowley Andrew G. President, Markel Ventures |
6 Value: $10.0K |
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|
Jun 30, 2025 Buy |
Costanzo Brian J. Chief Financial Officer |
2 Value: $4K |
About Insider Power
Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.
It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.
While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.
* October 6th, 2025 - Tested on 5562 stocks
