Primary care startup Oak Street is going public. We pored over its 188-page filing, and it reveals 5 crucial details about the company as it looks to transform how seniors are cared for.

· Primary care company Oak Street Health has filed to go public. 
· The company plans to trade under the ticker "OSH," setting itself up to be the second primary care company to go public in 2020 after One Medical's January debut. 
· In its S-1, which you can read here, Oak Street shared details about its business model...