Berkshire Hathaway's cash stockpile just reached record heights. Is that a warning sign for investors?There are few names in the investing world that have as much of an impact as Warren Buffett, so when the stock market mogul speaks, it often pays to listen.Some investors have noted that Buffett's holding company, Berkshire Hathaway (BRK.A 0.14%)(BRK.B 0.27%), has been stockpiling cash in recent years. In fact, in the third quarter of 2025, the company's cash holdings reached a record high of nearly $382 bi ...