Top political and market headlines this weekend include stock trades by lawmakers, Trump's tech export tax, and calls for Fed action after weak job data.

The biggest immediate changes will be that different people will be in control of the company's stock portfolio, and Abel will have power over Berkshire's $344 billion cash hoard. However, portfolio managers Ted Weschler and Todd Combs have been managing more of Berkshire's investments as the years have progressed.

D.R. Horton, Lennar, and other home builder stocks were rising Friday after Warren Buffett’s Berkshire Hathaway purchased shares.

At Berkshire Hathaway’s annual meeting earlier this year, Warren Buffett showed just how much of a fan he is of Apple’s CEO, Tim Cook. “Tim Cook has made Berkshire a lot more than I have made Berkshire,” Buffett said to laughter in the room. It was funny, but considering that Apple is Berkshire’s largest holding, I don’t think it was hyperbole.

Given Buffett's concern over the stock market, it makes sense for investors to buy the most conservative stocks in the Berkshire Hathaway portfolio.

Berkshire Hathaway bought Nucor stock. Hopefully, this purchase works out better than the last time Warren Buffett dabbled in the steel business. Shares of the steel maker were up 6.4% in early trading Friday at $153.65 a share, while S&P 500 and Dow Jones Industrial futures were each falling 0.1%.

However, Buffett has a keen eye for value and he never wants to overpay for a stock -- not even his own. Berkshire is currently trading at a price-to-sales ratio (P/S) of 2.5, which is a huge 25% premium to its 10-year average of 2.

Buffett's stealthy stock picks are like a ninja's moves: secretive but deadly effective. His recent bets on OXY and VRSN hint at potential upside.