Warren Buffett

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Warren Buffett’s Berkshire Hathaway has been loading up on shares of Amazon.

Berkshire upped its stake in Amazon by 11%, the Omaha, Nebraska-based holding company revealed in a government filing Wednesday. Berkshire now owns 537,300 shares of the e-commerce giant — worth $947 million after Wednesday’s market close. 

Buffett announced his initial Amazon investment in May, but said he was not the one behind the share purchases.

“One of the fellows in the office that manage money” bought shares of Amazon on behalf of Berkshire, Buffett told CNBC’s Becky Quick on the eve of the company’s annual shareholders meeting in Omaha.

Buffett also slightly increased his bet on bank shares, which have been hit this month on concerns about an inverted yield curve hurting profits for the group. Berkshire’s Bank of America stake was increased by 3.5% last quarter, according to the filing. It also raised its holding of USBancorp by 2.4%. Other big bank holdings, including Wells Fargo and J.P. Morgan Chase, remained the same.

The famous value investor has historically avoided major technology bets, ending a rough chapter in IBM last year. But in February 2017, he announced that Berkshire was buying a large stake in Apple. In the the first quarter of 2018, Berkshire added 75 million shares of the iPhone maker and told CNBC at the time that he clearly likes Apple, and “we buy them to hold.”

Buffett has consistently said he’s not overly focused on short-term performance. While he expects Berkshire to come out ahead over time, “we haven’t got the faintest idea what years we’ll be up or down,” Buffett told CNBC last year.

Kraft Heinz, Berkshire’s fourth largest holding, hit a record low last week after the company announced an additional write-down of $1.22 billion and missed revenue expectations. Buffett told CNBC in June that he “made a mistake in the Kraft purchase in terms of paying too much. “

In its last major SEC filing, Berkshire Hathaway disclosed an 18% increase in its J.P. Morgan Chase stake to 59.5 million shares in its last quarterly filing, and a 22% increase to its Red Hat holdings to 5.1 million shares. Red Hat was acquired by IBM for $34 billion in July.