Oak Street Health, a provider of primary health care aimed at Medicare-covered seniors, filed a registration statement Monday to sell shares to the public.

Terms of the offering have not been set. But Oak Street, which operates more than 50 primary care centers in such states as Illinois, Michigan and Indiana, estimates the total size of its targeted market to be $325 billion, according to the registration statement.

Earlier this year it unveiled an aggressive growth strategy, adding locations in new states, including plans for three in metro Detroit. The company has 10 centers in Michigan, according to its website.

The filing points to success with its existing centers, saying, “as we deliver on keeping our patients healthier, we capture the cost savings, driving our profitability.”

The filing states that as of March 31, 2020, Oak Street’s four centers with more than 2,000 at-risk patients for at least the last three months were at 86 percent weighted average capacity and generated revenues of $32.3 million.

Oak Street plans to list the shares on the New York Stock Exchange under the symbol “OSH.”

J.P. Morgan, Goldman Sachs, Morgan Stanley, William Blair and Piper Sandler are joint book-running managers for the proposed offering, according to a company news release.

Paul Barr writes for Crain’s sister publication Modern Healthcare.