The U.S. housing market has been under pressure as a result of substantial interest rate hikes from the Federal Reserve. But that hasn't deterred legendary investor Warren Buffett from placing big bets in the sector. In its latest 13F filing with the Securities and Exchange Commission, Buffett's company Berkshire Hathaway Inc. (NYSE:BRK) disclosed new stakes in three U.S. homebuilders. Investors often pay close attention to Buffett's 13F filings because of his track record of generating consiste