Berkshire Hathaway INC (BRK-B) SEC Filings — 2013 0 SEC filings for Berkshire Hathaway INC (BRK-B) in 2013. FilingsNo filings found for BRK-B in 2013. ExploreAll BRK-B Filings · BRK-B 2012 · BRK-B 2014 · All 2013 Filings