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Sion Power

Tucson, AZ · Founded 1989 · Privately Held (backing)

Developer of energy storage systems designed to address the future needs of the electric vehicle and aerospace markets today. Sion Power is based in Tucson, AZ and was founded in 1989. It was valued at $435 million at its later-stage round in Jan 2024, the last priced event on record. It has raised $145 million across 2 recorded rounds; the latest was a $240 million later-stage round in Nov 2021.

PMV mark · valuation
$435.0M
Oct 2026
Priced at
its later-stage round
Jan 2024
Total raised
$144.5M
Last round
Later Stage VC
Nov 2021

Sion Power key facts

as of Oct 2026
  • Developer of energy storage systems designed to address the future needs of the electric vehicle and aerospace markets today.
  • Sion Power is valued at approximately $435.0M as of Oct 2026, set at its later-stage round, Jan 2024; nothing has traded since, per PrivateMarketView’s mark.
  • It has raised $144.5M across 2 recorded rounds; the latest was Later Stage VC ($240.3M) in Nov 2021.
  • Notable investors include U.S. Department of Energy, United States Department of War, National Aeronautics and Space Administration, LG Technology Ventures, GM Ventures — 11 tracked in total.
  • Sion Power has filed 4 Form Ds with the SEC since 2011, most recently Nov 2021 ($20.0M sold to 5 investors).
  • Status: Privately Held (backing).
PrivateMarketView mark
LOW confidence
$435.0M

Valued at $435.0M at its later-stage round, Jan 2024. Nothing has traded since.

set by its last priced roundas of Oct 2026question about this number?
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Sion Power funding rounds

2 rounds
Nov 2021Later Stage VC$240.3MSEC filing▮
Nov 2021Early Stage VC$20.0MSEC filing▮
Full funding history →

Sion Power valuation

Sion Power was valued at $435 million at its later-stage round in Jan 2024. That is the last priced event on record: no secondary trade or institutional fund mark has moved the figure since.

How much has Sion Power raised?

Sion Power has raised $145 million across 2 recorded rounds since 2021. The largest was a $240 million later-stage round in Nov 2021.

Sion Power has filed 4 Form Ds with the SEC since 2011, most recently in Nov 2021 ($20 million sold to 5 investors).

Sion Power investors

11 investors are on record for Sion Power, including U.S. Department of Energy, United States Department of War, National Aeronautics and Space Administration and LG Technology Ventures. The later-stage round in Nov 2021 drew 5 investors.

About Sion Power

Developer of energy storage systems designed to address the future needs of the electric vehicle and aerospace markets today. The company's systems double the energy density of Li-Ion and advance lithium metal protection, enabling users to use compact and lightweight batteries that enhance the energy and cycle life of rechargeable lithium-metal batteries.

Sector
Business Products and Services (B2B)
HQ
Tucson, AZ, United States
Founded
1989
Employees
89
Ownership
Privately Held (backing)

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