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Company pair · Aerospace & Defense
VS

Axiom Space vs Sierra Space

Aerospace & Defense Both private US-headquartered No Canborsa market

Axiom Space vs Sierra Space: two of the better-known names in aerospace-defense, compared side by side.

On this pageSide by sideValuation marksWhat each disclosesVerdictFAQ
Axiom SpacePRIVATE · US
Sierra SpacePRIVATE · US
VS
Last valuation$2.5B$8B
Basis Post-money Post-money
As ofFeb 2026Mar 2026
Founded20162021
Employees≈790≈2,000
On CanborsaNo marketNo market
At a glance
$2.5B
Axiom SpacePost-money, Series D · Feb 2026
$8B
Sierra SpacePost-money, Series C · Mar 2026
3.20×
GapBoth post-money, one month apart
0 of 2
On CanborsaNeither company has a market
VS
Head-to-head · field by field

Axiom Space vs Sierra Space — side by side

Field
Axiom SpacePRIVATE · FOUNDED 2016
Sierra SpacePRIVATE · FOUNDED 2021
VS
Last valuation
$2.5B Post-money
$8B Post-money
Valuation date
1 Feb 2026
1 Mar 2026
Valuation basis
Post-money
Post-money
Latest round
Series D
Series C
Round size
$350M
$550M
Round lead
Type One Ventures, Qatar Investment Authority
LuminArx Capital Management
Named investors
Aljazira Capital Boryung 4iG Group
LuminArx Capital Management General Atlantic Coatue Moore Strategic Ventures
Founded
2016
2021
Employees (est.)
≈790
≈2,000
Sector & HQ
Commercial spaceflight / space infrastructure · 🇺🇸 US
Aerospace / commercial spaceflight and defence · 🇺🇸 US
Status & market
Private — no Canborsa market
Private — no Canborsa market
Valuation · both companies on one scale

Valuation marks

Each bar is the last disclosed mark — $2.5B for Axiom Space (post-money, Feb 2026) and $8B for Sierra Space (post-money, Mar 2026).

Axiom Space
$2.5BPost-money · Feb 2026
Sierra Space
$8BPost-money · Mar 2026
AXIOM SPACE · $2.5B · FEB 2026SIERRA SPACE · $8B · MAR 2026
Axiom Space vs Sierra Space · what each company discloses

What each company discloses, and what it leaves out

Axiom SpacePRIVATEAerospace & Defense · US · 2016
+Last disclosed mark $2.5B — post-money, Feb 2026.
+Founded 2016 .
+≈790 employees.
+Latest round: Series D, $350M raised, led by Type One Ventures.
Sierra SpacePRIVATEAerospace & Defense · US · 2021
+Last disclosed mark $8B — post-money, Mar 2026.
+Founded 2021 .
+≈2,000 employees.
+Latest round: Series C, $550M raised, led by LuminArx Capital Management.
Verdict

Verdict

The $2.5B tells you…
What an investor paid for newly issued shares — a primary round, priced post-money.
How much capital arrived with it:$350M, led by Type One Ventures in Feb 2026.
A dated print: it moves only when a newer round is announced.
The $8B tells you…
What an investor paid for newly issued shares — a primary round, priced post-money.
How much capital arrived with it:$550M, led by LuminArx Capital Management in Mar 2026.
A dated print: it moves only when a newer round is announced.

Both marks are post-money, so 3.20× compares like with like. Both are private: there is no public quote and no Canborsa market on either name.

Frequently asked questions

What industries are Axiom Space and Sierra Space in?›

Axiom Space operates in Commercial spaceflight / space infrastructure, and Sierra Space operates in Aerospace / commercial spaceflight and defence.

What is Axiom Space's valuation versus Sierra Space's?›

Axiom Space was last valued at $2.5B in February 2026, and Sierra Space at $8B in March 2026.

Who funded Axiom Space compared to Sierra Space?›

Type One Ventures and Qatar Investment Authority led the round for Axiom Space; LuminArx Capital Management led for Sierra Space.

Which is bigger by headcount, Axiom Space or Sierra Space?›

Axiom Space employs around 790 people; Sierra Space employs around 2,000.

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