 Corebridge Financial Inc. CRBG, -0.81 , the life insurance unit of American International Group Inc. AIG, 1.32 , received a lackluster reception in its public debut, as the stock opened 2.4 the initial public offering price. The company said overnight that its IPO priced at 21 a share, at the low end of the expected range, as the company raised 1.68 billion in the biggest IPO in a rather down year for IPOs. 