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 were both up about 2.5%. By Noel Randewich and Devik Jain July 15 (Reuters) - The Nasdaq tumbled on Thursday, pulled lower by Apple, Amazon and other Big Tech companies as investors digested a fall in weekly jobless claims and concerns about a recent inflation spike.