San Francisco-based Leadbay, the B2B AI prospecting platform, has secured a $4.3 million backed by Y Combinator, Rebel Ventures, Roosh Ventures, Inovexus Ventures, TS Ventures, and Alumni Ventures, as Vestbee was told.
- Founded in 2024 by Ludovic Granger and Milan Stankovic, Leadbay is a B2B software company that builds an AI platform for identifying and qualifying small and mid-sized business (SMB) sales leads that are often missing from traditional data sources.
- The company focuses on so-called “low-signal” businesses that lack digital footprints such as LinkedIn pages, job postings, or structured firmographic data, making them difficult to detect with conventional prospecting tools.
- Its system uses an inference-based AI model to analyze weak and fragmented signals and infer what a business does, who it serves, and how it is growing. Sales teams can interact with the platform by engaging with leads, which continuously improves the model’s accuracy over time.
Details of the deal
- The seed round also saw participation from Bright Ventures by Bright Data, Transpose Platform, and Deel Ventures, alongside founders and executives from Deel, Gusto, and Pennylane.
- The fresh investment will enable the firm to scale its US go-to-market team, advance its AI inference technology through ongoing research partnerships with Sorbonne University, and expand its engineering capabilities to improve how it discovers and qualifies previously hard-to-reach SMB sales leads.





