Gymlib SAS

Gymlib SAS

Gymlib SAS was founded in 2018 by Antoine Issenmann, a former investment banker with experience at Société Générale and the private equity arm of BPCE. Romain Sassi co-founded the firm and serves as its CEO. The firm operates as a single-family office based in Paris, France, drawing on the founders' wealth built through private equity and business ownership. Gymlib's investment strategy targets tangible, cash-flow-generating assets across three core pillars: real estate, infrastructure, and private credit. The firm is known to have a particular interest in healthcare-related real estate, including medical office buildings and senior-care facilities, in France and select European markets. It also provides direct lending to mid-market companies and participates in structured equity deals, often alongside institutional co-investors. Confirmed portfolio exposures include European medical-property assets and infrastructure debt positions (per public record). Geographic focus is primarily France, with selective expansion into Spain and Germany. The firm keeps a lean team structure, with fewer than 20 professionals based in Paris. Gymlib does not manage third-party capital — it invests exclusively for its own balance sheet, which gives flexibility in hold periods and asset selection. Recent operational activity includes a significant deployment in French senior-care real estate aligned with the country's aging-demographic trends. Gymlib's structural differentiator lies in its patient, unconstrained mandate: no external LPs, no fixed fund life, and the ability to hold illiquid assets for decades. This allows the firm to invest counter-cyclically in segments like private credit and infrastructure without the mark-to-market pressures faced by fund managers.