Berkshire Hathaway is still an active stock trader even with Buffett set to retire at the end of this year.

It can pay to follow Warren Buffett's investments. Through the conglomerate Berkshire Hathaway , the investor has made some remarkable stock picks, such as his 100-bagger investment in American Express . Even though Buffett is set to retire at the end of this year, he and his investment team are still buying stocks for Berkshire's portfolio.

Here are three stocks that they just plowed a combined $1.33 billion into. Should you follow Buffett and buy these three stocks for your own portfolio today?

Lennar's housing demand

In the second quarter, Berkshire Hathaway purchased 5.1 million shares of Lennar ( LEN -1.05% ) . The homebuilder has gone through a volatile period a

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