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Inertia

Founded 2024 · 65 employees on LinkedIn · 7 known investors

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Inertia develops laser systems and fuel targets for inertial confinement fusion power generation. The company aims to commercialize fusion energy technology for grid-scale electricity production.

Deep TechEnergyHardware

Founders & leadership

JLJeff Lawson
Jeff LawsonChief Executive OfficerHe co-founded Twilio in 2008 and led it as CEO until 2024, and acquired The Onion in 2024. Earlier in his career he founded Versity.com and Nine Star, served as StubHub's founding CTO, and worked as a technical product manager at Amazon.com.

Investors · 7

GV (Google Ventures)listed by GV (Google Ventures)Mountain View · $250K – $50M

How we know: GV (Google Ventures)'s portfolio page · finance.yahoo.com · open dataset · 5k.vc investor directory · Not right? Tell us

Long Journey Ventureslisted by Long Journey VenturesSan Francisco · $100K – $1M

How we know: Long Journey Ventures's portfolio page · Not right? Tell us

Threshold Ventureslisted by Threshold VenturesPalo Alto · $500K – $20M

How we know: finance.yahoo.com · Not right? Tell us

Uncork Capitallisted by Uncork CapitalSan Francisco · $3M – $5M

How we know: Uncork Capital's portfolio page · a partner's Signal profile · Not right? Tell us

Also in the syndicate · 2

Google VentureModern Capital

Funding

SEC filings, press & company announcements

$900M disclosed across 2 of 4 rounds · 2026

Source: company announcements and press reports — follow each round's link for the claim.

Related companies · 2

Helion EnergyHelion develops fusion energy systems designed to generate clean electricity for commercial use. The company builds pulsed magnetic fusion prototypes with applications for industrial and commercial electricity generation.
FFuse Energy develops fusion energy technology, with work spanning hardened electronics and radiation testing (HEART) and recycling of radioactive waste, aiming to provide an on-demand clean energy source. It brings together a team across engineering, fusion science, energy policy, and manufacturing.

Companies working in the same space as Inertia.

In the news

Inertia Enterprises Raises $450M in Series A Fundingfinsmes.com · Feb 2026Twilio co-founder’s fusion power startup raises $450M from Bessemer and Alphabet’s GV | TechCrunchtechcrunch.com · Feb 2026Inertia raises $450 million to commercialize the only proven fusion sciencefinance.yahoo.com · Feb 2026

Frequently asked questions

What does Inertia do?
Inertia develops laser systems and fuel targets for inertial confinement fusion power generation. The company aims to commercialize fusion energy technology for grid-scale electricity production.
Who are Inertia's investors?
Inertia's investors include Bessemer Venture Partners, GV (Google Ventures), Long Journey Ventures, Threshold Ventures, Uncork Capital.
How much funding has Inertia raised?
Inertia has disclosed $900M raised across 2 of its 4 known rounds.