S & K Investment Services

S & K Investment Services is the single-family office for Stewart Kohl, who co-founded The Riverside Company in 1988 alongside Béla Szigethy. Kohl continues to hold a significant equity stake in Riverside and serves as a partner, but the family office operates as a separate entity. The office invests as a limited partner in Riverside funds and draws on the firm's sourcing network for direct co-investment opportunities (per public record).

Kohl's investing is shaped by Riverside's lower-middle-market playbook: target founder-led businesses with $5–30 million of EBITDA, emphasize operational improvement over financial engineering, and hold assets until genuine value has been built. S & K Investment Services applies that thesis flexibly, participating in deals where patient capital and deep sector expertise are rewarded over auction-driven returns.

The office pursues both strategies. It commits as a limited partner to private equity funds — including but not limited to Riverside's vehicles — and also participates in direct co-investments alongside trusted general partners. Direct transactions tend to be lower-profile situations sourced through Kohl's professional network, particularly succession-driven acquisitions and founder recapitalizations.

The wealth traces to The Riverside Company, which Kohl and Béla Szigethy built from a small Cleveland buyout shop into a global private equity firm managing over $13 billion in assets. Riverside's strategy centers on acquiring and growing founder-owned companies in the smaller end of the middle market, executing over 1,000 transactions since inception. Kohl's ownership stake in the firm and carried interest across decades of fund vintages form the core of the family's capital base.

No. S & K Investment Services operates as a single-family office and does not accept outside capital or participate as a multi-family platform. The firm maintains no public marketing presence or website, consistent with the privacy posture common among Cleveland-based family offices managing concentrated private equity wealth.