William R. Berkley
CIK 918186 · View on SEC EDGAR ↗
Insider
Activist
First SEC filing: March 5, 2026 · Latest: June 4, 2026
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 91 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| June 3, 2026 | WRB | A | 3,090 | — | — | 17,366,375 Direct | +0.02% | Acquired | (price as of 2026-08-20) |
| Aug. 15, 2025 | WRB | F | 4,277 | $71.24 | $304,693 | 17,363,285 Direct | -0.02% | Disposed | -2.3% (price as of 2026-08-20) |
| Aug. 15, 2025 | WRB | A | 111,869 | — | — | 17,367,562 Direct | +0.65% | Acquired | (price as of 2026-08-20) |
| June 11, 2025 | WRB | A | 2,776 | — | — | 17,255,693 Direct | +0.02% | Acquired | (price as of 2026-08-20) |
| Aug. 15, 2024 | WRB | F | 4,604 | $57.75 | $265,881 | 17,252,917 Direct | -0.03% | Disposed | 20.6% (price as of 2026-08-20) |
| Aug. 15, 2024 | WRB | A | 120,430 | — | — | 17,257,521 Direct | +0.70% | Acquired | (price as of 2026-08-20) |
| June 12, 2024 | WRB | A | 2,534 | — | — | 11,424,727 Direct | +0.02% | Acquired | (price as of 2026-08-20) |
| Aug. 15, 2023 | WRB | F | 3,417 | $63.14 | $215,749 | 11,422,193 Direct | -0.03% | Disposed | 65.4% (price as of 2026-08-20) |
| Aug. 15, 2023 | WRB | A | 89,507 | — | — | 11,425,610 Direct | +0.79% | Acquired | (price as of 2026-08-20) |
| June 14, 2023 | WRB | A | 3,479 | — | — | 11,336,103 Direct | +0.03% | Acquired | (price as of 2026-08-20) |
| Aug. 15, 2022 | WRB | F | 3,792 | $65.78 | $249,438 | 11,332,624 Direct | -0.03% | Disposed | 58.8% (price as of 2026-08-20) |
| Aug. 15, 2022 | WRB | A | 99,374 | — | — | 11,336,416 Direct | +0.88% | Acquired | (price as of 2026-08-20) |
| June 15, 2022 | WRB | A | 2,995 | — | — | 11,237,042 Direct | +0.03% | Acquired | (price as of 2026-08-20) |
| Aug. 16, 2021 | WRB | F | 1,887 | $74.34 | $140,280 | 7,489,363 Direct | -0.03% | Disposed | 110.7% (price as of 2026-08-20) |
| Aug. 16, 2021 | WRB | A | 49,438 | — | — | 7,491,250 Direct | +0.66% | Acquired | (price as of 2026-08-20) |
| Aug. 5, 2021 | WRB | F | 1,164 | $72.22 | $84,064 | 7,441,812 Direct | -0.02% | Disposed | 116.9% (price as of 2026-08-20) |
| Aug. 5, 2021 | WRB | A | 30,512 | — | — | 7,442,976 Direct | +0.41% | Acquired | (price as of 2026-08-20) |
| June 15, 2021 | WRB | A | 2,652 | — | — | 7,412,464 Direct | +0.04% | Acquired | (price as of 2026-08-20) |
| Aug. 17, 2020 | WRB | F | 993 | $61.26 | $60,831 | 7,409,812 Direct | -0.01% | Disposed | 155.7% (price as of 2026-08-20) |
| Aug. 17, 2020 | WRB | A | 26,028 | — | — | 7,410,805 Direct | +0.35% | Acquired | (price as of 2026-08-20) |
| Aug. 5, 2020 | WRB | F | 3,004 | $62.07 | $186,458 | 7,384,777 Direct | -0.04% | Disposed | 152.4% (price as of 2026-08-20) |
| Aug. 5, 2020 | WRB | A | 78,736 | — | — | 7,387,781 Direct | +1.08% | Acquired | (price as of 2026-08-20) |
| June 12, 2020 | WRB | A | 3,483 | — | — | 7,309,045 Direct | +0.05% | Acquired | (price as of 2026-08-20) |
| Aug. 5, 2019 | WRB | F | 9,930 | $68.56 | $680,801 | 7,305,561 Direct | -0.14% | Disposed | 128.5% (price as of 2026-08-20) |
| Aug. 5, 2019 | WRB | A | 260,235 | — | — | 7,315,491 Direct | +3.69% | Acquired | (price as of 2026-08-20) |
| June 6, 2019 | WRB | A | 3,151 | — | — | 7,055,256 Direct | +0.04% | Acquired | (price as of 2026-08-20) |
| Aug. 6, 2018 | WRB | F | 1,227 | $76.06 | $93,326 | 4,841,403 Direct | -0.03% | Disposed | 208.9% (price as of 2026-08-20) |
| Aug. 6, 2018 | WRB | A | 32,148 | — | — | 4,842,630 Direct | +0.67% | Acquired | (price as of 2026-08-20) |
| May 31, 2018 | WRB | A | 2,619 | — | — | 4,810,482 Direct | +0.05% | Acquired | (price as of 2026-08-20) |
| Aug. 7, 2017 | WRB | F | 9,727 | $68.45 | $665,813 | 4,807,863 Direct | -0.20% | Disposed | 243.3% (price as of 2026-08-20) |
| May 16, 2017 | WRB | A | 3,000 | — | — | 4,817,590 Direct | +0.06% | Acquired | (price as of 2026-08-20) |
| May 25, 2016 | WRB | A | 3,000 | — | — | 4,814,590 Direct | +0.06% | Acquired | (price as of 2026-08-20) |
| Dec. 30, 2015 | WRB | G | 429,328 | — | — | 4,811,590 Direct | -8.19% | Disposed | (price as of 2026-08-20) |
| June 2, 2015 | WRB | A | 3,000 | — | — | 3,958,826 Direct | +0.08% | Acquired | (price as of 2026-08-20) |
| March 2, 2015 | WRB | F | 11,663 | $49.96 | $582,683 | 5,472,667 Direct | -0.21% | Disposed | 370.3% (price as of 2026-08-20) |
| May 20, 2014 | WRB | A | 3,000 | — | — | 5,484,330 Direct | +0.05% | Acquired | (price as of 2026-08-20) |
| July 22, 2013 | WRB | G | 297,315 | — | — | 7,481,330 Direct | -3.82% | Disposed | (price as of 2026-08-20) |
| May 21, 2013 | WRB | A | 3,000 | — | — | 7,248,235 Direct | +0.04% | Acquired | (price as of 2026-08-20) |
| Dec. 17, 2012 | WRB | F | 7,462 | $38.93 | $290,496 | 7,255,235 Direct | -0.10% | Disposed | 503.6% (price as of 2026-08-20) |
| Sept. 26, 2012 | WRB | A | 250,000 | — | — | 7,262,697 Direct | +3.56% | Acquired | (price as of 2026-08-20) |
| May 22, 2012 | WRB | A | 3,000 | — | — | 6,591,822 Direct | +0.05% | Acquired | (price as of 2026-08-20) |
| Feb. 2, 2012 | WRB | M | 179,688 | — | — | 0 Direct | — | Acquired | (price as of 2026-08-20) |
| Feb. 2, 2012 | WRB | F | 106,987 | $36.11 | $3,863,301 | 6,220,756 Direct | -1.69% | Disposed | 550.7% (price as of 2026-08-20) |
| Feb. 2, 2012 | WRB | M | 179,688 | $11.39 | $2,046,646 | 6,327,743 Direct | +2.92% | Acquired | 1963.1% (price as of 2026-08-20) |
| Dec. 30, 2011 | WRB | M | 100,000 | — | — | 179,688 Direct | -35.75% | Disposed | (price as of 2026-08-20) |
| Dec. 30, 2011 | WRB | F | 61,939 | $34.46 | $2,134,418 | 6,148,055 Direct | -1.00% | Disposed | 581.9% (price as of 2026-08-20) |
| Dec. 30, 2011 | WRB | M | 100,000 | $11.39 | $1,139,000 | 6,209,994 Direct | +1.64% | Acquired | 1963.1% (price as of 2026-08-20) |
| Dec. 22, 2011 | WRB | M | 100,000 | — | — | 279,688 Direct | -26.34% | Disposed | (price as of 2026-08-20) |
| Dec. 22, 2011 | WRB | G | 250,000 | — | — | 250,000 Indirect | — | Acquired | (price as of 2026-08-20) |
| Dec. 22, 2011 | WRB | G | 250,000 | — | — | 6,109,994 Direct | -3.93% | Disposed | (price as of 2026-08-20) |
| Dec. 22, 2011 | WRB | F | 62,171 | $34.04 | $2,116,301 | 6,359,994 Direct | -0.97% | Disposed | 590.3% (price as of 2026-08-20) |
| Dec. 22, 2011 | WRB | M | 100,000 | $11.39 | $1,139,000 | 6,422,165 Direct | +1.58% | Acquired | 1963.1% (price as of 2026-08-20) |
| May 17, 2011 | WRB | A | 3,000 | — | — | 5,910,915 Direct | +0.05% | Acquired | (price as of 2026-08-20) |
| March 11, 2011 | WRB | M | 500,000 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-20) |
| March 11, 2011 | WRB | F | 303,764 | $29.93 | $9,091,657 | 5,209,986 Direct | -5.51% | Disposed | 685.1% (price as of 2026-08-20) |
| March 11, 2011 | WRB | M | 500,000 | $9.34 | $4,670,000 | 5,513,750 Direct | +9.97% | Acquired | 2415.9% (price as of 2026-08-20) |
| March 10, 2011 | WRB | M | 525,000 | — | — | 500,000 Direct | -51.22% | Disposed | (price as of 2026-08-20) |
| March 10, 2011 | WRB | F | 319,078 | $29.89 | $9,537,241 | 5,013,750 Direct | -5.98% | Disposed | 686.2% (price as of 2026-08-20) |
| March 10, 2011 | WRB | M | 525,000 | $9.34 | $4,903,500 | 5,332,828 Direct | +10.92% | Acquired | 2415.9% (price as of 2026-08-20) |
| Dec. 31, 2010 | WRB | M | 1,000,000 | — | — | 1,025,000 Direct | -49.38% | Disposed | (price as of 2026-08-20) |
| Dec. 31, 2010 | WRB | F | 623,898 | $27.41 | $17,101,044 | 7,550,762 Direct | -7.63% | Disposed | 757.3% (price as of 2026-08-20) |
| Dec. 31, 2010 | WRB | M | 1,000,000 | $9.34 | $9,340,000 | 8,174,660 Direct | +13.94% | Acquired | 2415.9% (price as of 2026-08-20) |
| May 18, 2010 | WRB | A | 3,000 | — | — | 6,661,493 Direct | +0.05% | Acquired | (price as of 2026-08-20) |
| March 2, 2010 | WRB | A | 300,000 | — | — | 5,936,493 Direct | +5.32% | Acquired | (price as of 2026-08-20) |
| Dec. 30, 2009 | WRB | M | 265,780 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-20) |
| Dec. 30, 2009 | WRB | F | 133,113 | $24.47 | $3,257,275 | 5,636,493 Direct | -2.31% | Disposed | 860.3% (price as of 2026-08-20) |
| Dec. 30, 2009 | WRB | M | 265,780 | $3.06 | $813,287 | 5,769,606 Direct | +4.83% | Acquired | 7579.2% (price as of 2026-08-20) |
| May 19, 2009 | WRB | A | 2,000 | — | — | 7,203,826 Direct | +0.03% | Acquired | (price as of 2026-08-20) |
| May 28, 2008 | WRB | A | 2,000 | — | — | 9,992,757 Direct | +0.02% | Acquired | (price as of 2026-08-20) |
| May 12, 2008 | WRB | M | 303,750 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-20) |
| May 12, 2008 | WRB | F | 187,264 | $27.10 | $5,074,854 | 9,990,757 Direct | -1.84% | Disposed | 767.1% (price as of 2026-08-20) |
| May 12, 2008 | WRB | M | 303,750 | $9.35 | $2,840,062 | 10,178,021 Direct | +3.08% | Acquired | 2413.2% (price as of 2026-08-20) |
| May 8, 2007 | WRB | M | 1,796,875 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-20) |
| May 8, 2007 | WRB | F | 957,087 | $33.20 | $31,775,288 | 9,919,802 Direct | -8.80% | Disposed | 607.8% (price as of 2026-08-20) |
| May 8, 2007 | WRB | M | 1,796,875 | $6.70 | $12,039,062 | 10,876,889 Direct | +19.79% | Acquired | 3407.2% (price as of 2026-08-20) |
| May 8, 2007 | WRB | A | 1,500 | — | — | 9,080,014 Direct | +0.02% | Acquired | (price as of 2026-08-20) |
| March 1, 2007 | WRB | M | 1,000,000 | — | — | 1,796,875 Direct | -35.75% | Disposed | (price as of 2026-08-20) |
| March 1, 2007 | WRB | M | 1,000,000 | $6.70 | $6,700,000 | 9,078,514 Direct | +12.38% | Acquired | 3407.2% (price as of 2026-08-20) |
| Dec. 26, 2006 | WRB | M | 1,000,000 | — | — | 2,796,875 Direct | -26.34% | Disposed | (price as of 2026-08-20) |
| Dec. 26, 2006 | WRB | M | 1,000,000 | $6.70 | $6,700,000 | 8,078,514 Direct | +14.13% | Acquired | 3407.2% (price as of 2026-08-20) |
| May 16, 2006 | WRB | A | 1,500 | — | — | 7,078,009 Direct | +0.02% | Acquired | (price as of 2026-08-20) |
| Feb. 10, 2006 | WRB | M | 253,125 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-20) |
| Feb. 10, 2006 | WRB | M | 253,125 | $8.55 | $2,164,219 | 4,717,673 Direct | +5.67% | Acquired | 4022.5% (price as of 2026-08-20) |
| Dec. 5, 2005 | WRB | A | 210,000 | — | — | 4,464,548 Direct | +4.94% | Acquired | (price as of 2026-08-20) |
| May 10, 2005 | WRB | A | 1,000 | — | — | 4,254,548 Direct | +0.02% | Acquired | (price as of 2026-08-20) |
| May 11, 2004 | WRB | A | 90,000 | — | — | 4,544,653 Direct | +2.02% | Acquired | (price as of 2026-08-20) |
| May 11, 2004 | WRB | A | 189 | — | — | 4,454,653 Direct | 0.00% | Acquired | (price as of 2026-08-20) |
| Nov. 13, 2003 | WRB | M | 39,375 | — | — | 118,125 Direct | -25.00% | Disposed | (price as of 2026-08-20) |
| Nov. 13, 2003 | WRB | M | 39,375 | $6.89 | $271,294 | 4,454,464 Direct | +0.89% | Acquired | 7573.7% (price as of 2026-08-20) |
| Oct. 15, 2003 | WRB | M | 90,000 | $11.24 | $1,011,600 | 4,415,089 Direct | +2.08% | Acquired | 4603.9% (price as of 2026-08-20) |
| Oct. 15, 2003 | WRB | M | 90,000 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-20) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| Feb. 2, 2012 | WRB | Employee Stock Option (Right to Buy) | Common Stock | — | April 3, 2012 | 179,688 | Acquired |
| Dec. 30, 2011 | WRB | Employee Stock Option (Right to Buy) | Common Stock | — | April 3, 2012 | 100,000 | Disposed |
| Dec. 22, 2011 | WRB | Employee Stock Option (Right to Buy) | Common Stock | — | April 3, 2012 | 100,000 | Disposed |
| March 11, 2011 | WRB | Employee Stock Option (Right to Buy) | Common Stock | — | March 13, 2011 | 500,000 | Disposed |
| March 10, 2011 | WRB | Employee Stock Option (Right to Buy) | Common Stock | — | March 13, 2011 | 525,000 | Disposed |
| Dec. 31, 2010 | WRB | Employee Stock Option (Right to Buy) | Common Stock | — | March 13, 2011 | 1,000,000 | Disposed |
| Dec. 30, 2009 | WRB | Employee Stock Option (Right to Buy) | Common Stock | — | March 16, 2010 | 265,780 | Disposed |
| May 12, 2008 | WRB | Employee Stock Option (Right to Buy) | Common Stock | — | May 12, 2008 | 303,750 | Disposed |
| May 8, 2007 | WRB | Employee Stock Option (Right to Buy) | Common Stock | $6.70 | May 13, 2007 | 1,796,875 | Disposed |
| March 1, 2007 | WRB | Employee Stock Option (Right to Buy) | Common Stock | — | May 13, 2007 | 1,000,000 | Disposed |
| Dec. 26, 2006 | WRB | Employee Stock Option (Right to Buy) | Common Stock | — | May 13, 2007 | 1,000,000 | Disposed |
| Feb. 10, 2006 | WRB | Employee Stock Option (Right to Buy) | Common Stock | — | May 21, 2006 | 253,125 | Disposed |
| Nov. 13, 2003 | WRB | Employee Stock Option (Right to Buy) | Common Stock | — | March 16, 2010 | 39,375 | Disposed |
| Oct. 15, 2003 | WRB | Employee Stock Option (Right to Buy) | Common Stock | — | May 23, 2004 | 90,000 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).