The company, co-founded in 1976 and run by Henry Kravis and George Roberts, is one of the world's largest buyout firms with over $58.7 billion in assets under management. It still holds blockbuster leveraged -buyout deals like First Data, TXU and U.S. Foodservice as private companies in its portfolios, in addition to large interests in recently IPO'ed companies like Dollar General ( DG ), HCA ( HCA ) and Nielsen ( NLSN ). In spite of overall investing gains, many publicly trading investments fell significantly in the quarter, following a broad market decline. Among its investments, KKR now carries its recently IPO'ed companies at near 100% gains and above, while it's marked down its First Data investment by nearly half and its TXU buyout by 90%. TXU, a Texas utility, was the largest private equity buyout in pre-crisis boom years at $43.3 billion.