Warren Buffett stock picks continue to include a secret stock. Speculation was high that Buffett’s mystery holding would be revealed when his company, Berkshire Hathaway’s (NYSE:BRK.A/NYSE:BRK.B) latest 13F regulatory filing was made public. But no such luck. The Oracle of Omaha, as Buffett is known, has continued to ask the U.S. Securities and Exchange Commission (SEC) for confidential treatment of one of his stocks. Buffett has done this before. In late 2020, he kept secret the positions he was building i ...