Berkshire Hathaway recently filed its second-quarter 13F form, revealing its stock holdings at the end of June.

Berkshire Hathaway’s portfolio added six new stocks, including the three new secret stocks. Warren Buffett was a net seller of stocks for the eleventh straight quarter.

In May, a 13F filing revealed that Berkshire Hathaway was buying mystery stocks. Now, at last, we know what they are.

Warren Buffett turned a $40 billion Apple investment into $150+ billion, marking his most profitable investment ever. Learn the key principles behind this success and how they apply to all investors,

Buffett owned UnitedHealth shares before selling his stake in 2010, though his Berkshire Hathaway recently acquired shares.

The big surprise was a brand new, $1.6 billion stake in UnitedHealth, accumulated entirely during the second quarter.