VeriSign, based in Reston, Virginia, said the sale of 4.3 million shares was intended to reduce Berkshire's stake to below 10%, a threshold that triggers regulatory obligations. Berkshire may sell an additional 515,032 shares to meet demand. VeriSign will receive no proceeds from the sale.

The blockbuster deal raises the odds that Buffett’s Berkshire Hathaway, which owns the Burlington Northern Santa Fe railroad, will reach a deal with CSX to create a second transcontinental railroad. Union Pacific and BNSF compete in the western U.S., while CSX and Norfolk Southern are the two big Eastern railroads.

Berkshire Hathaway stock has been in a funk since the company’s May 3 annual meeting, when CEO Warren Buffett said he would step down as CEO at the end of the year. That has created an opportuni

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Acquiring CSX would be expensive for Berkshire, but it would still be accretive to its earnings, one analyst calculated.

VeriSign shares dropped after the company released the pricing of its previously announced underwritten secondary offering of its common stock by affiliates of Berkshire Hathaway. Shares were down 7% at $284.72 on Tuesday. The stock has been down 1.6% this month.

Kraft Heinz (NASDAQ:KHC) is considering undertaking a landmark separation of its business by spinning off a substantial part of its grocery division into a new, independently traded entity. The food giant's move follows years of lackluster growth,