At Y Combinator’s Demo Day, a short Ark pitch delivered in the midst of 64 other start-up presentations got the company commitments for $2 million in funding in a single day. And more than 250,000 people have signed up for Ark beta invites.

Less than a month after Demo Day, Ark now tells me that it has raised a $4.2 million seed round from investors including Andreessen Horowitz, Charles River Ventures, Greylock Partners, Intel Capital, SV Angel, Atlas Ventures, Crosslink Capital, Expansion Venture Capital, Felicis Ventures, Lightbank, Salesforce, Tencent, Transmedia Capital, and a bunch of individual angel investors.

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