It often takes an extraordinary event to take a stock to new highs. For Premiere Global (PGI), it was a $1 billion buyout. The company announced late Thursday that it had agreed to be acquired by Siris Capital Group. The private equity firm is paying $14 a share, a premium of 23% over Thursday’s closing share price. The stock soared 2.39 Friday, or 21%, to 13.74 in huge volume of 12.7 million shares.