2026Q1
| Insider | Role (last 12 mo) | Shares held | Filed at |
|---|---|---|---|
| National Indemnity Co | 10% Owner | 45,689,892 | Feb 15, 2018 |
| Berkshire Hathaway Inc | 10% Owner | 31,759,065 | Oct 29, 2025 |
| Jain Ajit | Chair | 356,308 | Oct 24, 2025 |
| Olson Ronald L | Director | 17,435 | Mar 16, 2016 |
| Davis Christopher C | — | 2,666 | Oct 28, 2021 |
| Exec date | Filing date | Insider | Role | Signal | Confidence | Shares | % of shares | Under plan? | Amount (USD) |
|---|---|---|---|---|---|---|---|---|---|
| Mar 4, 2026 | Mar 5, 2026 | Abel Gregory E. | Officer | Neutral | 52.5 | - | 0.00% | ✗ | - |
| Jan 29, 2026 | Feb 2, 2026 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -1,658,480 | -5.22% | ✗ | $199.9M |
| Nov 10, 2025 | Nov 12, 2025 | BUFFETT WARREN E | CEO | Neutral | 27.5 | -2,700,000 | -99.96% | ✗ | - |
| Nov 3, 2025 | Nov 5, 2025 | GUYMAN CHARLOTTE | Director | Neutral | 27.5 | -410 | -10.59% | ✗ | - |
| Oct 27, 2025 | Oct 29, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -401,514 | -1.25% | ✗ | $54.3M |
| Oct 22, 2025 | Oct 24, 2025 | Jain Ajit | Chair | Neutral | 52.5 | -32 | -0.03% | ✗ | - |
| Sep 26, 2025 | Sep 26, 2025 | Jain Ajit | Chair | Neutral | 27.5 | -15,000 | -12.23% | ✗ | - |
| Sep 24, 2025 | Sep 26, 2025 | Jain Ajit | Chair | Neutral | 52.5 | -32 | -0.03% | ✗ | - |
| Aug 8, 2025 | Aug 8, 2025 | Jain Ajit | Chair | Sell | 20.0 | -2,000 | -1.60% | ✗ | $929.5K |
| Jul 31, 2025 | Aug 4, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -1,635,962 | -4.84% | ✗ | $230M |
| Jul 31, 2025 | Aug 4, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 95.0 | +5,030,425 | 4.20% | ✗ | $106.5M |
| Jul 30, 2025 | Aug 1, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -4,300,000 | -32.36% | ✗ | $1.2B |
| Jul 14, 2025 | Jul 16, 2025 | BUFFETT WARREN E | CEO | Neutral | 27.5 | -30 | -2.62% | ✗ | - |
| Jun 27, 2025 | Jun 30, 2025 | BUFFETT WARREN E | CEO | Neutral | 27.5 | -12,358,321 | -99.99% | ✗ | - |
| May 22, 2025 | May 27, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 25.0 | -200,000 | -0.59% | ✗ | $27.8M |
| May 13, 2025 | May 15, 2025 | BUFFETT WARREN E | CEO | Neutral | 27.5 | -1,326 | -57.88% | ✗ | - |
| May 8, 2025 | May 12, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -1,145,938 | -3.26% | ✗ | $168.6M |
| Apr 9, 2025 | Apr 9, 2025 | BUFFETT WARREN E | CEO | Neutral | 27.5 | -160 | -16.82% | ✗ | - |
| Apr 2, 2025 | Apr 4, 2025 | Jain Ajit | Chair | Neutral | 52.5 | -10 | -0.01% | ✗ | - |
| Mar 19, 2025 | Mar 21, 2025 | GUYMAN CHARLOTTE | Director | Neutral | 27.5 | -1,000 | -29.66% | ✗ | - |
| Mar 14, 2025 | Mar 14, 2025 | Jain Ajit | Chair | Neutral | 52.5 | -10 | -0.01% | ✗ | - |
| Mar 3, 2025 | Mar 4, 2025 | WITMER MERYL B | Director | Sell | 42.5 | -2 | -0.20% | ✗ | $1.6M |
| Feb 24, 2025 | Feb 25, 2025 | WITMER MERYL B | Director | Neutral | 27.5 | -1,000 | -49.63% | ✗ | - |
| Feb 14, 2025 | Feb 19, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -750,000 | -2.09% | ✗ | $116.1M |
| Feb 11, 2025 | Feb 13, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 25.0 | -203,091 | -0.56% | ✗ | $31.7M |
| Feb 7, 2025 | Feb 11, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 72.5 | +763,017 | 0.29% | ✗ | $35.7M |
| Jan 30, 2025 | Feb 3, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +2,308,119 | 1.96% | ✗ | $54M |
| Jan 16, 2025 | Jan 17, 2025 | Jain Ajit | Chair | Neutral | 52.5 | -3 | 0.00% | ✗ | - |
| Dec 31, 2024 | Jan 3, 2025 | GUYMAN CHARLOTTE | Director | Neutral | 52.5 | - | 0.00% | ✗ | - |
| Dec 31, 2024 | Jan 3, 2025 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 65.0 | +20,044 | 0.15% | ✗ | $4.1M |
| Dec 26, 2024 | Dec 30, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 80.0 | +76,487 | 0.58% | ✗ | $15.6M |
| Dec 24, 2024 | Dec 27, 2024 | GUYMAN CHARLOTTE | Director | Neutral | 27.5 | -247 | -6.83% | ✗ | - |
| Dec 20, 2024 | Dec 26, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +143,424 | 1.10% | ✗ | $28.5M |
| Dec 17, 2024 | Dec 19, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +234,312 | 1.83% | ✗ | $45.4M |
| Dec 17, 2024 | Dec 19, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 95.0 | +4,963,844 | 4.41% | ✗ | $107.2M |
| Dec 17, 2024 | Dec 19, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 95.0 | +8,896,890 | 3.48% | ✗ | $409.2M |
| Dec 9, 2024 | Dec 11, 2024 | GUYMAN CHARLOTTE | Director | Neutral | 27.5 | -336 | -8.50% | ✗ | - |
| Dec 3, 2024 | Dec 4, 2024 | BUFFETT WARREN E | CEO | Neutral | 27.5 | -6,382 | -87.03% | ✗ | - |
| Nov 25, 2024 | Nov 25, 2024 | BUFFETT WARREN E | CEO | Neutral | 27.5 | -2,400,000 | -99.94% | ✗ | - |
| Nov 20, 2024 | Nov 22, 2024 | Jain Ajit | Chair | Neutral | 52.5 | -4 | 0.00% | ✗ | - |
| Nov 5, 2024 | Nov 7, 2024 | GUYMAN CHARLOTTE | Director | Neutral | 52.5 | - | 0.00% | ✗ | - |
| Oct 29, 2024 | Oct 31, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +2,227,939 | 2.02% | ✗ | $60.7M |
| Oct 16, 2024 | Oct 18, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +1,557,702 | 1.43% | ✗ | $42.1M |
| Oct 15, 2024 | Oct 17, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -8,694,538 | -1.12% | ✗ | $369.9M |
| Oct 17, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Neutral | 52.5 | - | 0.00% | ✗ | - | |
| Oct 9, 2024 | Oct 11, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 95.0 | +3,564,059 | 3.39% | ✗ | $86.7M |
| Oct 8, 2024 | Oct 10, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -9,549,933 | -1.22% | ✗ | $382.4M |
| Oct 3, 2024 | Oct 7, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -9,570,980 | -1.21% | ✗ | $383M |
| Sep 30, 2024 | Oct 2, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -8,547,947 | -1.06% | ✗ | $337.9M |
| Sep 25, 2024 | Sep 27, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -11,678,366 | -1.43% | ✗ | $460.7M |
| Sep 20, 2024 | Sep 24, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -21,561,209 | -2.58% | ✗ | $862.7M |
| Sep 17, 2024 | Sep 19, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -22,272,071 | -2.60% | ✗ | $896.1M |
| Sep 19, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Neutral | 52.5 | - | 0.00% | ✗ | - | |
| Sep 12, 2024 | Sep 13, 2024 | Jain Ajit | Chair | Neutral | 52.5 | -23 | -0.02% | ✗ | - |
| Sep 12, 2024 | Sep 13, 2024 | BUFFETT WARREN E | CEO | Neutral | 27.5 | -20 | -1.48% | ✗ | - |
| Sep 9, 2024 | Sep 12, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Neutral | 27.5 | -70,002,897 | -100.00% | ✗ | - |
| Sep 9, 2024 | Sep 12, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Neutral | 27.5 | -35,182,219 | -100.00% | ✗ | - |
| Sep 9, 2024 | Sep 11, 2024 | Jain Ajit | Chair | Neutral | 52.5 | - | 0.00% | ✗ | - |
| Sep 6, 2024 | Sep 10, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 25.0 | -5,797,093 | -0.67% | ✗ | $228.7M |
| Sep 3, 2024 | Sep 5, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -18,746,304 | -2.12% | ✗ | $760M |
| Aug 28, 2024 | Aug 30, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -21,076,473 | -2.33% | ✗ | $848.2M |
| Aug 23, 2024 | Aug 27, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -24,660,563 | -2.66% | ✗ | $981.9M |
| Aug 15, 2024 | Aug 19, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -13,968,943 | -1.48% | ✗ | $550.7M |
| Jul 30, 2024 | Aug 1, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -19,216,833 | -2.00% | ✗ | $778.7M |
| Jul 25, 2024 | Jul 29, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -18,414,846 | -1.88% | ✗ | $767M |
| Jul 22, 2024 | Jul 24, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -18,899,518 | -1.89% | ✗ | $802.5M |
| Jul 17, 2024 | Jul 19, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 15.0 | -33,890,927 | -3.28% | ✗ | $1.5B |
| Jul 2, 2024 | Jul 2, 2024 | BUFFETT WARREN E | CEO | Neutral | 27.5 | -1,233 | -47.68% | ✗ | - |
| Jun 28, 2024 | Jun 28, 2024 | BUFFETT WARREN E | CEO | Neutral | 27.5 | -13,008,758 | -99.98% | ✗ | - |
| Jun 13, 2024 | Jun 20, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 17.5 | -65,330 | -1.29% | ✗ | $2.2M |
| Jun 13, 2024 | Jun 17, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Sell | 17.5 | -65,330 | -1.29% | ✗ | $2.2M |
| Jun 13, 2024 | Jun 17, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +2,947,611 | 1.17% | ✗ | $176M |
| Jun 10, 2024 | Jun 12, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 80.0 | +1,750,308 | 0.70% | ✗ | $105.6M |
| Jun 5, 2024 | Jun 7, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +2,565,477 | 1.03% | ✗ | $153.3M |
| May 15, 2024 | May 17, 2024 | Jain Ajit | Chair | Neutral | 52.5 | -25 | -0.02% | ✗ | - |
| Apr 29, 2024 | May 1, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 71.3 | +311,637 | 0.45% | ✗ | $7.9M |
| Apr 24, 2024 | Apr 26, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +500,000 | 1.44% | ✗ | $12.3M |
| Apr 24, 2024 | Apr 26, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 80.0 | +647,016 | 0.94% | ✗ | $15.9M |
| Apr 10, 2024 | Apr 12, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +1,134,331 | 1.67% | ✗ | $29.3M |
| Apr 10, 2024 | Apr 12, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +803,890 | 2.37% | ✗ | $20.8M |
| Apr 4, 2024 | Apr 8, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 95.0 | +2,423,625 | 3.70% | ✗ | $66.4M |
| Apr 4, 2024 | Apr 8, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 95.0 | +1,122,705 | 3.43% | ✗ | $30.7M |
| Mar 26, 2024 | Mar 28, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 97.5 | +2,521,431 | 8.34% | ✗ | $73.4M |
| Mar 26, 2024 | Mar 28, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 100.0 | +7,599,572 | 13.13% | ✗ | $221.2M |
| Mar 21, 2024 | Mar 25, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +1,276,439 | 2.25% | ✗ | $36.8M |
| Mar 21, 2024 | Mar 25, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 95.0 | +1,282,569 | 4.43% | ✗ | $36.9M |
| Mar 8, 2024 | Mar 12, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 100.0 | +3,720,082 | 14.74% | ✗ | $111.4M |
| Mar 8, 2024 | Mar 12, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 100.0 | +5,927,375 | 11.70% | ✗ | $176.7M |
| Mar 4, 2024 | Mar 6, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 95.0 | +2,183,430 | 4.50% | ✗ | $63.9M |
| Mar 4, 2024 | Mar 6, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 97.5 | +1,491,510 | 6.28% | ✗ | $43.6M |
| Feb 1, 2024 | Feb 5, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +4,302,324 | 1.76% | ✗ | $245.9M |
| Jan 30, 2024 | Feb 1, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +1,028,053 | 2.17% | ✗ | $31.2M |
| Jan 30, 2024 | Feb 1, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 95.0 | +799,629 | 3.49% | ✗ | $24.3M |
| Jan 23, 2024 | Jan 25, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +1,002,741 | 2.16% | ✗ | $31.1M |
| Jan 23, 2024 | Jan 25, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 90.0 | +438,945 | 1.95% | ✗ | $13.6M |
| Jan 2, 2024 | Jan 18, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 95.0 | +1,090,754 | 2.65% | ✗ | $32.5M |
| Jan 2, 2024 | Jan 18, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 95.0 | +1,669,219 | 3.86% | ✗ | $49.7M |
| Jan 12, 2024 | Jan 17, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 97.5 | +1,203,024 | 5.65% | ✗ | $36.6M |
| Jan 12, 2024 | Jan 17, 2024 | BERKSHIRE HATHAWAY INC | 10% Owner | Buy | 95.0 | +1,591,168 | 3.55% | ✗ | $48.4M |
| Jan 12, 2024 | Jan 12, 2024 | Jain Ajit | Chair | Neutral | 52.5 | -28 | -0.02% | ✗ | - |