Warren Buffett's company has completed its acquisition of Burlington Northern Santa Fe Corp.

Berkshire Hathaway Inc. paid roughly $100 per share in cash and stock for the 77.4 percent of BNSF shares that it didn't already own.

Berkshire said Friday BNSF shareholders will receive roughly $15.87 billion in cash, 80,932 Class A and 21 million Class B shares of Buffett's company.

Friday, Berkshire's A shares gained $860 to sell for $115,810, and the B shares gained 21 cents to sell for $76.90.

Berkshire's stock prices push the value of the deal up to roughly $27 billion.

The purchase of the Fort Worth, Texas-based railroad is the largest ever for Buffett's Omaha, Neb.-based company.