10 Founders Backed by Mark Siegel (2026)

10 founders backed by Mark Siegel, with company, stage, and round detail. Includes OpenRouter and Frontera Health.

Mark Siegel founders (10)

Mark Siegel founders covers 10 founders on Alta, Chai Discovery and Ember Software and 7 other companies. The most common sectors are AI Infrastructure (2), Healthtech (2) and Biotech (1). Members are based in 6 cities, led by New York, NY (3), San Francisco, CA (3) and Denver, CO (1). The remaining members span Climate (1), Fintech (1), IT Services and IT Consulting (1) and SaaS (1). Companies represented include Eve, Frontera Health, Monarch Money, OpenRouter, Owl AI, Runwise and Slingshot AI. Every founder below links to a profile with their company, backers, and the filings behind each round.

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•By Alejandro Cremades