Warren Buffett’s conglomerate could reveal that equity holding when it discloses its stock investments as of Dec. 31, 2020 on a securities filing expected late Tuesday.Speculation is that it could be Walt Disney,PayPal Holdings, Google parent Alphabet,Home Depot,Exxon Mobil, or Chevron.When it released its most recent quarterly filing in mid-November for about $250 billion of equity holdings, Berkshire said that it had made a confidential filing for unnamed investments, stating “Confidential inf