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    AngelBacked

    Mainstay

    Artificial Intelligence (AI)Boston, Massachusetts, United StatesUndisclosed$30.3M total fundingwww.mainstay.com
    Latest funding:Convertible Note (December 12, 2025)

    Angel investors who backed Mainstay

    4 investors in our database backed Mainstay.

    Charlie Cheever

    Co-Founder

    Bill Lynch

    CTO

    Chris Gabrieli

    Chairman

    Samuel H.

    Founder and CEO

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