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ESS Tech, Inc.

Wilsonville, OR · Founded 2020 · Energy · Public

Iron flow batteries for long-duration energy storage

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Updated · essinc.com

Sector
Energy
Headquarters
Wilsonville, OR
Founded
2020
Latest Form D
$900K, Jul 2025
Total capital
$28.4M
Federal grants
$50K
1 award · 2020
Rank in peer group#12 of 151
Private capital raised
$28.4M
2 Form D · last Jul 2025
15 months since last filing
Federal contracts
None on recordNo federal contract awards found.
Granted patents
15
25 pending · first 2024
Rank in peer group#6 of 151

Capital timeline

202020212022202320242025FEDERAL ↑EQUITY ↓Cumulative $28.4M$50K1st Form D$27.5M2nd Form D$900K
202020212022202320242025FEDERAL ↑EQUITY ↓Cumulative $28.4M$50K1st Form D$27.5M

Latest events

  • Private capital raisedForm D · SEC · 2nd filing$900K
  • Private capital raisedForm D · SEC · 1st filing$27.5M
  • Federal grantDefense · Phase I · Clean, Long-Duration Energy Storage$50K

Node area is scaled to amount. Form D reports securities sold, which can differ from an announced round; filings are numbered in the order they were made.

Federal first

43months

from ESS Tech, Inc.’s first federal award to its first private round.

First federal award · Mar 2020
Defense · $50K
First Form D · Sep 2023
$27.5M · 1st Form D
Awards before first raise
1 award

An association in public records, not a cause or a prediction.

Standing among 151 peers

Line = median

Energy · Device

  • Federal grants#12 · top 8%
  • Granted patents#6 · top 4%

Cumulative measures favor older companies. Rankings describe position today, not outcome. Below the median, ranks show as a band rather than a number.

Founders and team

From SEC Form D filings
  • Alexi WellmanDirectorNamed in SEC Form D filings
  • Alexi P WelmanDirectorNamed in SEC Form D filings
  • Anthony P RabbExecutive OfficerNamed in SEC Form D filings
  • Eric P DresselhuysExecutive Officer, DirectorNamed in SEC Form D filings
  • Harry QuarlsDirectorNamed in SEC Form D filings
  • Kelly GoodmanExecutive OfficerNamed in SEC Form D filings
Show all 11 people
  • Kyle P TeameyDirectorNamed in SEC Form D filings
  • Michael R NiggliDirectorNamed in SEC Form D filings
  • Raffi GarabedianDirectorNamed in SEC Form D filings
  • Rich HossfeldDirectorNamed in SEC Form D filings
  • Sandeep P NijhawanDirectorNamed in SEC Form D filings

What it has protected

USPTO · 15 granted of 40
  • PendingMethod and System for Rebalancing Electrolytes in a Redox Flow Battery SystemUSPTOApplication 18893698
  • PendingRebalancing Reactor RecoveryUSPTOApplication 19043251
  • PendingCost-efficient High Energy Density Redox Flow BatteryUSPTOApplication 19169934
Show all 40 patent records

Related companies, and why

Regulatory activity · Energy

Sector-level, not company-level

Rules are matched to sector, not to company. Recent activity in a sector is context rather than a signal about this business — until rules are matched to what a company actually builds, the section is shown as context and nothing more.

Sources

Federal grants from SBIR/STTR, NIH, NSF and DoD records. Federal contracts from USAspending.gov. Private capital from SEC Form D. Patents from USPTO. Publications from OpenAlex. Regulatory activity from the Federal Register. Press matched on company name.

How to read this page

Figures show associations in public records, not causes or predictions. Nothing here is investment advice. An em-dash means no record was found under this company's name, not that none exists.

Data freshness

SEC Form D filings through . SBIR and STTR awards through .