By Liz Moyer
Investing.com -- Citigroup Inc (NYSE:C) shares surged 8% on Tuesday after a regulatory filing late Monday by Warren Buffett's Berkshire Hathaway (NYSE:BRKa) revealed the conglomerate had taken a 55 million-share stake last quarter.
The stake was valued at nearly $3 billion at the end of March.
Buffett has long been a fan of bank and financial stocks. Still Berkshire exited out of a long-time position in Wells Fargo & Company (NYSE:WFC) in the first quarter after gradually whittling away at it for three years.
Bank of America Corp (NYSE:BAC) and American Express Company (NYSE:AXP) remain stock holdings and currently rank among Berkshire's largest. It also took on a new stake in Ally Financial Inc (NYSE:ALLY), valued around $390 million.
Citi shares have lagged behind other financials, down nearly 15% this year and about 33% over one year.