Middle Street Capital

Middle Street Capital

Middle Street Capital was founded in 2004 by David Levine and Michael O'Leary, both of whom previously worked at Heller Financial and LaSalle Bank. The firm operates as a private credit manager, not a family office, and has no disclosed wealth-origin link to a single-family fortune. Its investment strategy centers on direct lending to lower-middle-market companies, typically providing $10 million to $40 million per transaction. The firm deploys capital primarily through senior secured loans, unitranche structures, and mezzanine debt, targeting companies with EBITDA between $3 million and $20 million. Sectors of focus include specialty manufacturing, healthcare services, business services, and niche financial services. Known portfolio companies include Lakeside Healthcare Solutions and American Physician Partners, both investments made via direct lending partnerships (per SEC filings, 2022). The firm's geographic footprint is concentrated in the Midwest and Southeastern United States, though it occasionally participates in transactions nationally. Middle Street Capital does not disclose aggregate AUM or number of investment professionals. It operates from a single Chicago office. No large philanthropic foundation or adjacent vehicle is publicly linked to the firm. The firm has been active in recent years, with SEC filings showing ongoing fund-raising for Middle Street Capital Partners IV, a private credit vehicle closed in 2022 (per SEC Form D, 2022). The firm's structural differentiator is its narrow focus on the lower-middle market, a segment often underserved by larger private credit platforms. By avoiding upper-middle-market and broadly syndicated loans, Middle Street Capital maintains a more hands-on underwriting process and closer relationships with portfolio company management. The partnership structure, with Levine and O'Leary holding equal leadership stakes, provides continuity since the firm's founding.