 Sweetgreen Inc. SG, -0.64 is headed for its public debut Thursday, after the California-based operator of health-driven restaurants said overnight that its upsized initial public offering priced at 28 a share, well above the expected range of between 23 and 25 a share. The company raised 364.0 million as it sold 13.0 million Class A shares in the IPO, up from an expected 12.5 million share offering. 