The most significant transaction on today's list comes in a Form 4 filing by Warren Buffett and Berkshire Hathaway.

Buffett just bought an additional 2,138,250 shares in Occidental Petroleum Corp $OXY. This is his first purchase in almost a month.

The most significant transaction on today's list comes in a Form 4 filing by Madison Square Garden Entertainment Corp $MSGE director Thomas C. Dolan.

Dolan reported the acquisition of 322,580 MSGE shares, equivalent to roughly $10 million.

The most significant transaction on today's list comes in a Form 4 filing by Hadi Partovi, director of Axon Enterprise Inc $AXON.

Partovi reported an AXON purchase worth $4.7 million.

The most significant transaction on today's list comes in a Form 4 filing by Carl Icahn.

Icahn revealed a purchase of $531,478 in Southwest Gas Holdings $SWX.

The most significant transaction on today's list comes in a Form 4 filing by Danaos Corp $DAC, which revealed a purchase of $7.2 million in Eagle Bulk Shipping Inc $EGLE.

Danaos has quietly amassed an 11.32% ownership stake in its competitor in recent months.

The most significant transaction on today's list comes in a 13G filing by Ecor1 Capital.

Ecor1 raised its ownership stake in Zymeworks Inc $ZYME from 11.80% to 19.90%.

The most significant transaction on today's list comes in a Form 4 filing by Matrix Capital Management.

The hedge fund reported the acquisition of 4,760,000 shares, equivalent to $107.8 million, in the small-cap biotech company Zentalis Pharmaceuticals, Inc $ZNTL.

The most significant transaction on today's list comes in a Form 4 filing by Donegal Mutual Insurance Company.

The firm reported a $2,279,836 purchase in Donegal Group Inc $DGICA.

The most significant transaction on today's list comes in a Form 4 filing by Dan Wilks, the manager of THRC Management

Wilks revealed a purchase of 285,059 Profrac Holding Corp $ACDC shares, equivalent to roughly $3.8 million.

The most significant transaction on today's list comes in a Form 4 filing by Diversified Healthcare Trust $DHC director Adam Portnoy.

Portnoy revealed a DHC purchase worth roughly $17.9 million.

The most significant transaction on today's list comes in a Form 4 filing by Ryan Cohen, executive chairman of GameStop $GME.

Cohen revealed a purchase of 443,842 GME shares, equivalent to roughly $10 million.

The most significant transaction on today's list comes in a Form 4 filing by Len Blavatnik.

Blavatnik reported a purchase of $10 million in Day One Biopharmaceuticals $DAWN.