Berkshire Hathaway INC (BRK-B) SEC Filings — 2012 0 SEC filings for Berkshire Hathaway INC (BRK-B) in 2012. FilingsNo filings found for BRK-B in 2012. ExploreAll BRK-B Filings · BRK-B 2011 · BRK-B 2013 · All 2012 Filings