XL Batteries
PrivateLast Round
Seed Round
Jun 30, 2026
Total Funding Raised
$24.6M
Momentum
Top 5%
of companies Caplight tracks
Company Overview
XL Batteries operates in Energy & Sustainability and is based in Marlborough, Massachusetts. Its latest recorded funding round was a Seed round in September 2025.
XL Batteries is a cleantech company that develops and provides a low-cost, grid-scale Organic Flow Battery for utility-scale energy storage.
Sector
Energy & Sustainability
Verticals
Energy Storage, Renewable Energy, Smart Grid
Business Model
B2B
Customer Profile
Hardware Sales
AI Layer
Non-AI
Historical Pricing
Historical view of private secondary pricing and transaction trends.
XL Batteries Comparables
Compare XL Batteries with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Quino Energy | 89% | |
| Otoro Energy | 88% | |
| Flux XII | 87% |
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XL Batteries Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Seed Round | Jun 30, 2026 | ||||
| Seed | Sep 17, 2025 | ||||
| Seed | Feb 23, 2023 | ||||
| Grant | Sep 1, 2022 | ||||
| Accelerator | Sep 17, 2021 |
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Key People
Founding team and executive leadership
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XL Batteries Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Catalus Capital | Seed |
| Xerox Ventures | Seed |
| Myriad Venture Partners | Seed |
| SIP Global Partners | Seed |
| National Science Foundation | Grant |
| Third Derivative | Accelerator |
Market signals
Structured signals derived from secondary market and firmographic data.
- Jun 30, 2026
$13M round raised
- Apr 20, 2026
Received the 2026 BloombergNEF Pioneers award.
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Recent news
Latest coverage and updates
- partners_withSep 10, 2026
On Sep 9th '26 in Massachusetts, XL Batteries and ENEOS Corporation enter into a Memorandum of Understanding establishing a framework for long-term collaboration to advance long-duration energy storage and accelerate the commercialization and commercial deployment of XL Batteries' technology.
- is_developingSep 9, 2026
On Sep 9th '26 in Massachusetts, XL Batteries is developing low-cost, safe, and scalable organic flow battery systems for grid-scale energy storage and enters a memorandum of understanding with ENEOS Holdings to advance the technology through a joint feasibility study.
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XL Batteries Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
Filing documents are not displayed on this public page. Request access to learn about available coverage.
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Frequently Asked Questions
Common questions about XL Batteries's valuation, stock price, and market status.
Is XL Batteries a public or private company?
XL Batteries is a private company.
What is the current stock price of XL Batteries?
XL Batteries is a private company, so its shares have no public market price. Caplight tracks XL Batteries's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is XL Batteries worth (valuation)?
Valuation information for XL Batteries is not publicly available.
Can I buy XL Batteries stock?
XL Batteries shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was XL Batteries's last funding round?
XL Batteries's most recent funding round was Seed Round on June 30, 2026.
Who are the main investors in XL Batteries?
Key investors in XL Batteries include Catalus Capital.
Will XL Batteries IPO soon?
No public IPO plans have been announced for XL Batteries.
How can I track XL Batteries secondary market activity?
Caplight tracks bids, offers, and trades in XL Batteries's shares on secondary markets.