Medline shares surged more than 40% in their hotly anticipated New York debut on Wednesday, valuing the medical supply giant at $54 billion in the largest US initial public offering since Rivian’s 2021 listing, capping a strong year for new listings and fueling optimism for 2026.Shares of the company opened at $35, compared with its IPO price of $29 per share. The stock closed at $41.The medical supplies maker and distributor — acquired for $34 billion in 2021 by Blackstone, Carlyle and Hellman & Friedman i ...