
Shares of home builders Lennar and D.R. Horton rise premarket after Warren Buffett's Berkshire Hathway reveals stake
Lennar LEN gains 3.5%, D.R. Horton DHI adds 2.8%
Berkshire reveals stakes of 1.5 million shares in DHI, and an increased stake in LEN
Buffett's conglomerate said it was buying the two co's before April, but SEC let it keep purchases confidential so investors wouldn't piggyback
Stock prices often rise after Berkshire's disclosures, with investors viewing them as Buffett's seal of approval
As of last close, LEN up 0.8% and DHI up 18.3% YTD compared to S&P 1500 Homebuilding index's .SPCOMHOME gain of 10.6%