First Harmonic
First Harmonic is an early-stage venture capital firm located in San Francisco, California. The firm focuses on investing in seed-stage B2B companies and offers a unique, free, non-dilutive go-to-market (GTM) program. This program is designed to help founders identify and acquire their initial customers through an intensive curriculum that covers essential aspects like building a repeatable sales motion, defining an Ideal Customer Profile, and developing pricing strategies. The team at First Harmonic consists of former operators who are dedicated to supporting visionary entrepreneurs. They wo
Investing activity
First Harmonic appears in 1 AI deal tracked by the AI Lounge deals desk, rounds totalling $14M, and led 1 of them. The rounds are mostly Seed, with a median round size of $14M. The most recent is Simple AI (Seed, $14M, Feb 2026).
First Harmonic most often invests alongside True Ventures, Massive Tech Ventures and Y Combinator, and the companies it backs on AI Lounge are mostly in AI.
Deals
Frequently asked questions about First Harmonic
What AI companies has First Harmonic invested in?
First Harmonic's AI investments include Simple AI. The 1 round on AI Lounge are listed on this page with amounts, dates and co-investors.
Where is First Harmonic based?
First Harmonic is based in Somersworth, New Hampshire, United States.
What stage does First Harmonic invest at?
In the rounds tracked on AI Lounge, First Harmonic has invested at Seed, with a median round of $14M. First Harmonic led 1 of those rounds.
Who does First Harmonic co-invest with?
First Harmonic's most frequent co-investors on AI Lounge are True Ventures (1 deal), Massive Tech Ventures (1 deal) and Y Combinator (1 deal).
How can founders reach First Harmonic?
Founders on AI Lounge can see First Harmonic's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with the firm under Warm Paths, and add First Harmonic to their Investor Pipeline to track the conversation.