Sinclair & Rush

Sinclair & Rush

Sinclair & Rush traces its origins to 1950, when William Sinclair co-founded a small dip-molding operation outside St. Louis. Over seven decades, the operating company — Sinclair & Rush, Inc. — grew into a diversified plastics manufacturer with facilities across the United States, the United Kingdom, and China, producing components for industries ranging from medical devices to heavy equipment. The wealth generated by that industrial base is now stewarded through the family office, which shares its name and leadership with the underlying operating business. The family office deploys capital across three main asset classes: direct commercial real estate, private equity investments in industrial and manufacturing companies, and opportunistic venture-stage allocations. The real estate portfolio concentrates on multi-tenant industrial parks and distribution facilities in the Midwest and Southeastern United States. On the private equity side, the firm targets majority and minority stakes in niche manufacturers with sustainable competitive advantages in precision components. Venture exposure is limited and tends to follow adjacency plays in advanced materials and process automation that complement the family's manufacturing expertise. Team size is not publicly disclosed, and the office operates without a stated external deployment target. Governance sits with the founding generation, with William Sinclair serving as Chairman and Robert Rush as President of both the operating company and the family office. No separate investment committee structure or external CIO appointment has been reported. The firm maintains a deliberately low profile, consistent with a second-generation industrial family office that has not opened its capital or deal flow to outside limited partners. The structural distinction of Sinclair & Rush lies in its tight coupling with an active operating business. Most single-family offices manage financial assets severed from the underlying wealth generator; Sinclair & Rush invests from ongoing manufacturing dividends while the founding principals remain engaged in both the industrial and investment sides. This creates a permanent-capital posture with no fundraising cycles and no external reporting obligations, but also concentrates key-person risk in the two principals who oversee both enterprises.