Billionaire Buffett's Berkshire buys more Citigroup and several other stocks, slashes Verizon

Berkshire also finally exited Wells Fargo & Co, a 33-year-old investment that Buffett soured on after finding it too slow to address revelations that employees had mistreated customers, including by opening unwanted accounts.

Berkshire Hathaway Inc on Monday said it added new investments in Citigroup Inc C.N and several other companies in the first quarter, as Warren Buffett's conglomerate took advantage of volatile stock markets to invest $51.1 billion that had largely been sitting in cash.

In a regulatory filing describing its U.S.-listed equity investments as of March 31, Berkshire reported new stakes in Ally Financial Inc ALLY.N, chemicals and specialty materials company Celanese Corp CE.N, insurance holding company Markel Corp MKL.N, drug distributor McKesson Corp MCK.Nand Paramount Global PARA.O, formerly known as ViacomCBS.