New York-based Centerbridge Partners LP has extended its tender offer to acquire Scottsdale, Ariz.-based P.F. Chang’s China Bistro Inc. The private-equity firm made its first offer of $1.1 billion in May. As of Thursday, 16.3 million of the company's shares had been tendered, representing about 88.4 percent of its common stock. Centerbridge said the offer is being extended only to allow the settlement of shares tendered under notices of guaranteed delivery. P.F. Changs operates under its namesake banner, as well as Pei Wei Asian Diners.