Last Thursday, Chicago-based Oak Street Health (OSH) became the latest healthcare services company to become a publicly traded corporation. Its underwriters set its share price at $21. Investors liked the company’s story driving its price to $43.47 at mid-day Thursday and before settling at $39.00 as markets closed Friday. Not a bad week for its investors, especially insiders and underwriters who owned shares prior to the IPO. And not a bad start for the company which netted $328 million to fund its expansion plans.