Blackstone BX.N said late on Wednesday it would pay $2.2 billion for 9.9% stake in American International Group's AIG.N life and retirement business. AIG and Blackstone both ralliedmore than 3%. By Noel Randewich and Devik Jain July 15 (Reuters) - The Nasdaq ended lower on Thursday, pulled down by Apple, Amazon and other Big Tech companies as a fall in weekly jobless claims data fed investor concerns about a recent inflation spike.