Inertia
Nuclear Energy
$468.4Mtotal raised · 4 rounds on record
2open roles
$450Mlatest round · Series A · Feb 2026 · 8 mo ago
5backers · In-Q-Tel, Bessemer Venture Partners
Overview
Inertia accelerates clean fusion energy with proven science, expert leadership, and a clear plan to deliver safe, affordable, limitless power.
Funding and backers
Total raised
$468.4M
4 rounds on record
Latest round
$450M
Series A · Feb 2026 · 8 mo ago
Team
51-200
employees, estimated range
Hiring now
3
open roles
Backers
5
In-Q-Tel, Bessemer Venture Partners
The money's age
Fresh money
8 months since the last round · hiring slowed
Momentum
35/100
in the news, fresh money
Last sign of life
1 mo ago
a posting or a news item
The story so fareach stage dated by its source: the company's releases, the press, registers, filings
Feb 11
Raised a round Series A $450M
Mar 19, 2025
Board appointment George Pontikes Jr., Director · SEC Form D
Aug 16, 2024
Board appointment George Pontikes, Director · SEC Form D
Jul 23, 2024
Raised a round Venture round $5.2M · SEC Form D
2024
Founded
May 10, 2023
New executive Vijay Alagarraj, Executive Officer, Director · SEC Form D
Jan 19, 2023
Raised a round Venture round $13.2M · SEC Form D
Jun 15, 2021
New executive John Chaney, Director · SEC Form D
Feb 27, 2020
Board appointment Rick Thompson, Director · SEC Form D
Jun 7, 2019
Took on debt financing $8.6M · SEC Form D
Tractionpublic signals, read monthly
Web presence
top 6%
of 133.2M domains by links, Common Crawl
Hacker News stories
1
best: 2 points
Funding rounds
| Round | Date | Amount | Investors | Source |
|---|---|---|---|---|
| Series A | Feb 2026 | $450M | — | axios.com |
| Venture round | Jul 2024 | $5.2M | — | SEC Form D |
| Venture round | Jan 2023 | $13.2M | — | SEC Form D |
| Debt Financing | Jun 2019 | $8.6M | — | SEC Form D |
Registers and programsofficial lists and records that name the company
| Legal entity | Inertia Systems, Inc. | SEC Form D |
Founders and leadersfrom filings, registers and the company's site
John ChaparroExecutive OfficerSEC Form D
Matthew HudelsonDirectorSEC Form D
John ChaneyDirectorSEC Form D
Vijay AlagarrajExecutive Officer, DirectorSEC Form D
Brett TrukaExecutive OfficerSEC Form D
Backed byfrom the funds' portfolios and accelerator catalogs
Investors in similar startupsfunds that back the companies most like this one
Similar startupsby what they do, their industry and backers
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Jobs
$70k – $85k per year · In office · Full-Time · 5+ years exp · Livermore
IAM
Windows
Cybersecurity
Okta
Management
ITSM
Apply
$165k – $225k per year · In office · Full-Time · 10+ years exp · Livermore
Apply
Salary insights
Compensation ranges based on this company's open jobs
Median
$225k
Typical range
$85k – $280k
Open positions
3
3
Jobs
Senior
33.3%
Staff
33.3%
Architect
33.3%
| Level | Jobs | Median | Typical range |
|---|---|---|---|
| Senior | 1 | $85k | $85k |
| Staff | 1 | $225k | $225k |
| Architect | 1 | $280k | $280k |
Highest paying role
VP, Finance
$280k
Normalized to USD per year
Visa sponsorship
1 ▼ 50%
H-1B filings in 12 months
$188k
Median offered salary
3
Open roles in United States
Who they sponsor
Database architects
1
In the register as Inertia Systems Inc., Chula Vista, CA
Other sponsors in the same field
AtkinsRéalis 
GE Vernova 
Dominion Energy 
Ameren
See 3 open roles Alert me
US Department of Labor · latest filing Jun 25, 2026 · Visa details by country
Growth
Hiring Momentum
27/100
Slowing
Open positions
3
0 opened / 2 closed in 30 days
Median time-to-fill
215 days
faster than 5% of the market
ATS activity
Every ~4 hours
Today
Hiring Dynamics
0%
Hiring Focus
The percentage next to each role is its share of the company's job openings over the last 90 days; the arrow shows the shift versus the previous period.
Support
33% ▼
Finance
33% ▼
Legal
33% ▼
Activity Timeline
Added Windows to stack
Sep 2026
Added ITSM to stack
Sep 2026
People
John Chaparro
Executive Officer
Matthew Hudelson
Director
John Chaney
Director
Vijay Alagarraj
Executive Officer, Director
Brett Truka
Executive Officer
Rick Thompson
Director
Clay Morel
Director
Mark Sawyer
Director
George Pontikes
Director
George Pontikes Jr.
Director
Names and roles come from public filings, company registers and the company's own site. Is this you? Correct or remove · How we handle this data
Tech stack
Technologies named in job postings at Inertia over the last 12 months, by layer, with the share of postings for each.
Technologies in use
9
Postings analysed
4
Stack modernity
71/100
Languages
C++
Fortran
Python
Cloud & platforms
Okta
Windows
Sign in to see how your skills match this stack
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Full Inertia tech stack
9 technologies · by team · pay by technology · changes · similar stacks
Connections
List
Graph
Found in company registers, site code, DNS and hiring. Each connection shows how sure we are and the evidence, with its source and date.
Shared investors
Uncork CapitalVia a fund
In-Q-TelVia a fund
Long Journey VenturesVia a fund
Bessemer Venture PartnersVia a fund
502 portfolio companies
GVVia a fund
569 portfolio companies
Click a company to open it. Dashed lines are likely connections. The second step of the network is part of the Pro plan.
Owner
Same company
Same group
Likely
News
Inertia co-founder Jeff Lawson's joins Disrupt 2026
Inertia co-founder and CEO Jeff Lawson joins the Smart Systems Stage at TechCrunch Disrupt 2026. Register now to save up to $200 by Sept 25.
Read more
Report
Exclusive: Inertia Enterprises finds a way to make its fusion fuel fast
Fusion power startup Inertia Enterprises reduced the fuel filling process from a week to just a few hours. It's one of 10 hurdles the company must overcome to make a profitable power plant.
Read more
Report
Exclusive: Inertia's Roadmap to Commercialize Laser Fusion
The spinoff of Lawrence Livermore National Lab has a new 10-point plan to get onto the grid by the 2030s.
Read more
Report
July 13, 2026 axios.com Behind the scenes of Inertia's newly opened fusion facility Read more
Read more
Report
World's 1st fusion factory in Livermore aims to be clean energy source for commercial use
Fusion energy moved from theory to reality at Livermore-based Inertia at Lawrence Livermore National Laboratory.
Read more
Report
E139: Make fusion energy, then repeat. Inertia Enterprises, Part 1 Everybody in the Pool
Listen to E139: Make fusion energy, then repeat. Inertia Enterprises, Part 1 from Everybody in the Pool. Fusion has been
Read more
Report
Interview Of The Week: Kimberly Budil, Director, Lawrence Livermore National Laboratory
The Innovator presents digital transformation experts, insights on how startups are changing business, and exploring where business connects with tech.
Read more
Report
US firm, Lawrence Lab to scale laser-based nuclear fusion breakthrough
A major collaboration between Inertia Enterprises and LLNL aims to turn decades of public R&D into a commercial energy reality.
Read more
Report
Inertia moves to commercialize one of the world's most elaborate science experiments
Inertia has signed three agreements with the Lawrence Livermore National Lab, paving the way for the company to bring its pioneering fusion reactor to market.
Read more
Report
Show more news
Offices
Where the company hires and what each office is for
Cities
1
Hiring now
1
Countries
1
Busiest office
Livermore
Livermore
United States
HQ
3 open roles 3 posted in 90 days 50-200 est. staff $197k Avg Salary
hires for Support, Finance, Industrial Engineering