Berkshire Hathaway doubled its stake in Macy's and increased its Delta Air Lines holdings by 44% in the second quarter. It also initiated a position in homebuilder D.R. Horton and significantly increased its stake in another homebuilder, Lennar. These investments are seen as contrarian bets, signaling confidence in the airline, retail, and housing markets. Additionally, Berkshire repurchased $4.5 billion of its own stock during the same period.