Berkshire Hathaway took a stake in Domino’s Pizza in the third quarter, buying 1.3 million shares that were worth about $550 million on Sept. 30, according to a quarterly form 13-F filing with the Securities and Exchange Commission released Thursday after the close of trading. Domino’s is the only sizable new equity holding by Berkshire in the period. Domino’s shares jumped 7.6% to $469.01 in the Friday premarket in an apparent reaction to the Berkshire news having fallen 0.8% to close at $435.97 in regular trading.