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Waltham, MAEnergyFounded 2021
1 source · checked 1 time, last 52m ago
Developing: it holds up against its sources so far, and firms up as more reporting lands.
The SEC filing identifies an exempt offering but does not state its stage, amount, valuation, or investors.
| Round | Amount | Announced | Lead | Buzz |
|---|---|---|---|---|
| Form D (equity) [ REPORTED LATER ]: This round was announced before Fireround first saw it. It stays in the company's history, not in Latest, Trending, or alerts. | n/a | 2026-09-18 | not stated | No recent discussion |
1 source · checked 1 time, last 52m ago [ DEVELOPING ] Developing: it holds up against its sources so far, and firms up as more reporting lands. read against 1 source
The SEC filing identifies an exempt offering but does not state its stage, amount, valuation, or investors. [ BUILT WITH ]·[ SEARCH ]from a Form D filing·[ SCRAPE ]1 page read: sec.gov·[ JSON ]round read into a schema, with the sentence that states it·[ VERIFY ]correctedchecked against 1 source·[ AGENT ]company research by the Firecrawl agent | ||||
| EARLIER ROUNDS FROM COMPANY RESEARCH · DEVELOPING | ||||
| Series A | $15M | 2024-10-23 | At One Ventures | |
| Seed | $5.15M | 2022-09-01 | Primavera Capital Group | |
Adden Energy builds self-healing, lithium-metal solid-state battery cells for automakers and other industries, aiming to make electric vehicles charge faster, last longer, and cost less.
EV adoption is held back by slow charging, limited range, short lifetimes, and safety concerns, while Adden says its self-healing solid-state cells combine lithium metal with demonstrated lab charging as fast as three minutes and more than 10,000 cycles. Its $15M Series A is funding a roll-to-roll pilot line intended to scale production 100x, and the company says automakers and industrial users have begun ordering cells for validation—making the key bet whether Harvard-originated performance can survive manufacturing scale-up.
Checked against 9 sources today
None named.
Also named as backers in company research: At One Ventures