The Refiners

Founding partners Geraldine Le Meur and Carl Diaz lead all investment decisions at The Refiners. Both were active European operators before launching the firm, and their prior experience scaling and exiting companies shapes the accelerator's mentor-driven selection process. Investment committee participation occasionally draws on extended operator partners from the San Francisco technology ecosystem whom the founders recruited during the LeWeb conference years.

Deal flow originates primarily through the founders' deep French and pan-European operator networks, including alumni of the LeWeb technology conference series that Le Meur co-founded. The Paris office acts as a pre-screening hub, evaluating teams before they apply to the San Francisco accelerator program. Direct referrals from European venture funds—particularly those with seed portfolios that lack US distribution capacity—represent a secondary sourcing channel.

The Refiners historically wrote initial Seed or Pre-Seed checks of roughly $100,000 to $250,000 per company (per TechCrunch, 2016) as part of its structured three-month program. For follow-on capital, the firm shifted strategy around 2018, moving toward a syndicate and fund-of-funds model rather than reserving large pools of follow-on capital internally. This change aimed to connect graduating portfolio companies directly with Bay Area Series A and B investors including Redpoint Ventures, which led a subsequent round for portfolio company Unsupervised.

The Refiners targets Seed and Pre-Seed stages, typically writing the first or second institutional check into a company. The accelerator structure is built for teams that have a functional product and initial European market traction but have not yet established US commercial operations. Companies accepted into the program are expected to relocate to San Francisco for the 12-week period and concentrate full-time on US go-to-market execution.

The firm has concentrated on enterprise software, AI/ML, FinTech, digital health, and mobility. Its generalist seed-stage mandate within these sectors allows it to evaluate any European technology company with a product ready for US commercial deployment. Sector selection in practice has been driven more by founder quality and the scale of the US addressable market than by any formal thematic allocation policy.

The Refiners operates a hybrid structure: a traditional venture fund that makes direct equity investments in portfolio companies, layered with an operating-company model for the accelerator program itself. Limited partners in the fund gain exposure to a portfolio of European-origin technology companies that have undergone a structured US go-to-market immersion. The firm maintains dual offices in San Francisco and Paris, reflecting the transatlantic operating model that underpins its investment thesis.

The Refiners is explicitly a cross-border bridge, not a domestic startup program. Unlike most accelerators that source from their local ecosystem, The Refiners requires portfolio founders to relocate from Europe to San Francisco for the program duration and provides legal, banking, and housing infrastructure that makes that relocation feasible. Its founding thesis—that geographic proximity to US customers, partners, and investors changes a European founder's trajectory faster than remote advisory can—remains its structural edge.