Who invested in XL Batteries

2 rounds we have observed, with the 2 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.

Energy

Raised 4 months ago

Funding summaryUpdated 26 Oct 2026

$21Mraised across 2 rounds since 2025, from 2 sources

$7.5MSeed$13MVenture

Latest round: Venture, $13MJul 2026
Step-upi: 1.7×
Investors: 2

See who backed them

The funding story

Each circle is a round, placed by date and sized by amount. The line above is the running total.

2026

$7.5MSeed$13MVenture

First round: Seed, $7.5M
Biggest round: $13M
Between rounds: 10 months

The rounds

Jul 2026
Venture$13M2 returning
- National Science Foundation
- Third Derivative
Source recordedSEC filing: $13M sold
Sept 2025
Seed$7.5M2 new
- National Science Foundation
- Third Derivative
Source recordedSEC filing: $7.5M sold, first sale Aug 2025

Founders and team

From XL Batteries's own website: 2 on the team.

Tom SistoCEO
Mike RubinoCFO

Who was in which round

The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.

Seed2025Venture2026

National Science Foundation

Third Derivative

Everyone who backed them

National Science FoundationGovernment2rounds

Third DerivativeAccelerator2rounds

Missing a round, or an investor who was in one? Tell us.

Also claim to have backed them

This firm lists XL Batteries as a portfolio company on their own website, but no report of a round names it. They are the firms' own claims, kept apart from the rounds above.