Yeah, they did, and within a month or two it was reinvested elsewhere. Whether it was pulling out of American Airlines in favor of more shares of Chevron, or doubling down on tech stocks. BRK doesn’t just sit on 150bn in cash for longer than they have to. Not saying they don’t sit on cash but they definitely don’t sit on it for a year or more.
[0] Berkshire Hathaway - https://www.dataroma.com/m/holdings.php?m=BRK