A Long Island angel investment fund launched in March has deployed more than $750,000 in three deals, including one to a startup whose executive offices are based in Mineola, a fund executive said.

Richard Foster, managing director of AngelFire Ventures, based in Garden City, said that the fund has committed more than $1 million, including the initial $750,000 plus additional investments earmarked for later funding rounds. The three rounds closed in the spring and summer, he said.

Angel investors typically provide the first outside investments to startups. These seed investments, often in the tens or hundreds of thousands of dollars, precede larger venture capital investments often measured in the millions.

AngelFire contributed more than a quarter-million dollars to the roughly $4 million first venture capital round for ProSeeder Technologies LLC, a Manhattan company with executive offices in Mineola, Foster said.

ProSeeder develops cloud software used to track deals by private investors such as angel networks and venture capital funds, including Tech Coast Angels in San Diego.

AngelFire's other investments went to Boston-based Trumpit, maker of a smartphone app that sends shared photos to the lock screens of friends, and Manhattan-based LiftMetrix, which measures the impact of marketers' social media activities.

Foster and managing director Harvey Brofman founded AngelFire, which allows wealthy accredited investors to invest in startups with as little as $10,000. Foster said AngelFire allows investors to participate in the fund's investments but also make additional investments in the companies on their own.

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"Our model is a hybrid [between] an angel group and a fund," he said.

Eighteen angels, all from Long Island, have joined the group, which finds deals through alliances with regional angel groups and venture capital funds, he said.

"Our pipeline is very strong," Foster said of prospective deals. "Another group will lead the deal, and our fund will hop on." AngelFire is hoping to do two more deals by year-end, he added.