Leadbay, a San Francisco and France-based AI platform for B2B prospecting, has raised $4.3M in seed funding. The company trains custom AI models on customers' historical won and lost deals to surface high-intent leads with minimal online signals, enriching them with decision-maker contacts and predictive qualification scores. The capital will fund a US go-to-market team in San Francisco, a research partnership with Sorbonne University, and engineering expansion.
AI Sales Tools Heat Up for SMB Signals
The round arrives as AI-powered sales intelligence gains momentum. Clay raised $100M Series C at $3.1B valuation in August 2025, while broader sales intelligence platforms like Apollo.io and ZoomInfo continue scaling. Leadbay differentiates by targeting the digitally scarce SMB segment that broad enrichment tools overlook, using proprietary models instead of large public data lakes.
Predictive Models Unlock Low-Signal Leads
Traditional B2B databases and intent platforms struggle with companies that maintain minimal online footprints. Leadbay's approach addresses this by analyzing a customer's past deals to build predictive profiles, reportedly expanding addressable markets by 3x and qualified leads by 10x for users in sectors like manufacturing and construction.
AI Inference Targets Data-Scarce SMBs
Leadbay's platform uploads customer win/loss data to train specialized models that score prospects for intent and fit. This contrasts with competitors like ZoomInfo, which rely on massive aggregated datasets, or Clay, which emphasizes enrichment workflows. The system generates qualification questions, talking points, and email drafts tailored to low-signal leads.
"We found in 10 minutes on Leadbay what we couldn’t find in 6 months with Clay and a GTM agency."
YC and Specialized Funds Back Predictive Sales AI
Y Combinator led the round alongside Rebel Ventures, Roosh Ventures, Alumni Ventures, and Bright Ventures. YC's involvement signals strong conviction in AI-native sales tools, while corporate backing from Bright Data's venture arm adds strategic data infrastructure expertise. The investor mix validates Leadbay's focus on SMB prospecting where conventional signals fail.
Sales Intelligence Market Expands Rapidly
The sales intelligence market stands at $5.37 billion in 2026 and is projected to reach $12.45 billion by 2034 at an 11.1% CAGR, per Fortune Business Insights. Key drivers include 87% enterprise adoption of AI in sales and demand for predictive models that handle incomplete datasets.
Sorbonne Partnership and US Expansion Ahead
Leadbay plans to scale its San Francisco team for US market entry while advancing a three-year AI research collaboration with Sorbonne University focused on inference from limited SMB data. The company has already secured customers including L'Oréal, Saint-Gobain, and Nespresso B2B.