Adden Energy, Inc.

Other EnergySolid State BatteriesEVEnergy Storage

📍 Waltham, MA, United States• Founded 2021

StreetZero Signal 69

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About Adden Energy, Inc.

Adden Energy, Inc. is a Waltham, Massachusetts-based company founded in 2021 by William Fitzhugh that develops solid-state battery systems for electric vehicles, licensed exclusively from Harvard University. The company aims to enable fast-charging batteries that fully charge in minutes. It has raised approximately $20.2M to date across multiple rounds including a $5.15M-$5.2M seed round in 2022 and a $15M Series A in 2024.

LATEST FUNDINGPrivate Placement

$16.9M

Announced 2026-10-05

TOTAL RAISED$20.2M

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IN THE NEWS

EMPLOYEES—

FOUNDED2021

HQWaltham, MA, United States

Industry

Other Energy

Investors

Primavera Capital Group At One Ventures BDC Venture Capital Fulcrum Global Capital Rhapsody Venture Partners MassVentures

Key highlights

Licensed solid-state battery technology exclusively from Harvard University in 2022.
Completed $15M Series A led by At One Ventures in September 2024.
Raised $5.2M seed round in 2022 led by Primavera Capital Group.
Targets fast-charging solid-state batteries for electric vehicles.
Total funding stands at approximately $20.2M with 7 institutional investors noted.

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Source document & SEC filing

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