Aug 7 (Reuters) - Berkshire Hathaway Inc on Saturday reported improved quarterly operating results, as the conglomerate controlled by billionaire Warren Buffett showed signs of recovery from the depths of the coronavirus pandemic. Second-quarter operating profit rose 21% to $6.69 billion from $5.51 billion a year earlier. Net income, including gains from common stock investments, rose 7% to $28.1 billion, or $18,488 per Class A share, from $26.3 billion, or $16,314 per share, a year earlier. Berkshire also said it repurchased about $6 billion of stock in the quarter, on top of approximately $31.3 billion of previously disclosed buybacks since the end of 2019. Reporting by Jonathan Stempel in New York; Editing by Kirsten Donovan Our Standards: The Thomson Reuters Trust Principles.