Warren Buffett's Berkshire Hathaway increased its stakes in U.S. Bancorp (USB) and Bank of New York Mellon (BK) during the second quarter.

The conglomerate disclosed in a regulatory filing that it bought roughly 840,000 shares of U.S. Bancorp's stock, raising its stake in the Minneapolis company to 4.3%. Berkshire Hathaway also bought about 9,000 shares in Bank of New York Mellon, boosting its stake to 2.2%.

Berkshire Hathaway also made a large investment in Goldman Sachs (GS). An amended warrant agreement allowed the firm to receive roughly 13 million shares of the investment bank's stock, or a 2.9% ownership stake.

Berkshire Hathaway didn't add to its sizeable position in Wells Fargo (WFO), though the San Francisco company remains the conglomerate's biggest holding, representing about 21% if its overall portfolio, according to SNL Financial. And the market value of Berkshire Hathaway's Wells Fargo shares rose 6.8% during the third quarter. The Buffett-controlled firm owns 8.7% of Wells Fargo's stock.

Other bank-related positions were unchanged during the quarter, including Berkshire Hathaway's 4.1% stake in M&T Bank (MTB) and its 14.2% stake in American Express (AXP). The firm also has a 0.4% stake in MasterCard (MA) and a 0.3% stake in Visa (V).

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