Markel Corporation
Markel Corporation (MKL) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MKL · as of Sep 30, 2025
Ownership Breakdown
865
Institutional Holders
▼ 2 vs Q2
$18.98B
Total Inst. Value
▼ $1.09B vs Q2
12.51M
Shares Outstanding
freeFloat 97.75%
9.92M
13F Shares Held
▼ 134,011 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MKL largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC fire, marine & casualty insurance | 1.17M | 9.24% | 9.24% | $2.24T | Nov 7, 2025 | ▲ 5.2K |
BLACKROCK, INC. fire, marine & casualty insurance | 720.0K | 5.67% | 5.67% | $1.38T | Nov 12, 2025 | ▲ 7.7K |
PRINCIPAL FINANCIAL GROUP INC fire, marine & casualty insurance | 547.2K | 4.31% | 4.31% | $1.05T | Nov 4, 2025 | ▲ 9.5K |
MORGAN STANLEY fire, marine & casualty insurance | 448.4K | 3.53% | 3.53% | $857.11B | May 27, 2026 | ▼ 23.5K |
SELECT EQUITY GROUP, L.P. fire, marine & casualty insurance | 382.7K | 3.01% | 3.01% | $731.54B | Nov 14, 2025 | ▲ 46.4K |
DAVIS SELECTED ADVISERS fire, marine & casualty insurance | 373.5K | 2.94% | 2.94% | $713.95B | Dec 29, 2025 | ▲ 2.4K |
STATE STREET CORP fire, marine & casualty insurance | 304.4K | 2.40% | 2.40% | $581.82B | Nov 14, 2025 | ▲ 6.2K |
BOSTON PARTNERS fire, marine & casualty insurance | 269.3K | 2.12% | 2.12% | $514.94B | Nov 13, 2025 | ▼ 2.8K |
GEODE CAPITAL MANAGEMENT, LLC fire, marine & casualty insurance | 225.3K | 1.77% | 1.77% | $429.36B | Nov 12, 2025 | ▲ 11.8K |
DAVENPORT & CO LLC fire, marine & casualty insurance | 205.0K | 1.61% | 1.61% | $391.43B | Oct 15, 2025 | ▲ 325 |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
24
Increased
+190.4K shares0
New Positions
first time holders22
Decreased
−154.2K shares0
Sold Out
fully exitedNet shares change (top 50)
+36.2K
+190.4K / −154.2K
Net new holders
+2
0 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MKL insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
14
Buy transactions
4
Sell transactions
3.50
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Harris Greta J director | May 22, 2026 | Sale | 35 | $1846.12 | $64.6K | 686 | Form 4 ↗ |
Harris Greta J director | May 22, 2026 | Sale | 14 | $1847.36 | $25.9K | 672 | Form 4 ↗ |
Harris Greta J director | May 22, 2026 | Sale | 27 | $1848.83 | $49.9K | 645 | Form 4 ↗ |
MICHAEL JONATHAN E director | May 20, 2026 | Award | 89 | — | — | 266.805 | Form 4 ↗ |
Morrison Harold Lawrence Jr. director | May 20, 2026 | Award | 89 | — | — | 1.1K | Form 4 ↗ |
Besca Mark director | May 20, 2026 | Award | 89 | — | — | 1.1K | Form 4 ↗ |
Harris Greta J director | May 20, 2026 | Award | 89 | — | — | 721 | Form 4 ↗ |
Cunningham Lawrence A director | May 20, 2026 | Award | 89 | — | — | 1.0K | Form 4 ↗ |
OREILLY MICHAEL director | May 20, 2026 | Award | 89 | — | — | 3.8K | Form 4 ↗ |
Housel Morgan E. director | May 20, 2026 | Award | 89 | — | — | 963.05 | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Markel Corporation (MKL) is primarily owned by institutional investors, who hold approximately 79.3% of total shares outstanding. Company insiders own approximately 2.25%, while retail and public investors account for the remaining 18.45%.
The largest institutional shareholder of Markel Corporation is VANGUARD GROUP INC, holding approximately 1.17 million shares — equal to 9.24% of outstanding shares — as of September 30, 2025.
A total of 865 institutional investors currently hold MKL stock, with a combined institutional value of approximately $18.98 billion as of the most recent 13F filing period.
Frequently asked questions
MKL ownershipMarkel Corporation (MKL) is primarily owned by institutional investors, who hold approximately 79.3% of shares. The largest shareholder is VANGUARD GROUP INC with a 9.24% stake. Company insiders hold 2.25%. Data sourced from SEC Form 13F as of September 30, 2025.