Warren Buffett went on a buying spree in the stock market during the first quarter, when Berkshire  Hathaway purchased $51bn of equities, a quarterly record for the company.

Investors will be interested to see if Berkshire Hathaway took advantage of the stock market’s drop in the second quarter to add to its $390bn equity portfolio. The numbers should be available, along with details that can help investors assess the stock’s valuation, when Berkshire reports its second-quarter results on 6 August.