United States · 
Who invested in Sphinx?
Sphinx's investors include Y Combinator, Rebel Fund, SBXi Fund, Lightspeed Venture Partners and Founders Fund, and 5 more on record.
20252026
$500KSeed$2.0MPre-seed$9.5MSeed$7.1MSeedUnited States · Seed startup
Who invested in Sphinx
4 rounds we have observed, with the 10 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.
Raised 9 months ago
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Funding summaryUpdated 5 Nov 2026
$19Mraised across 4 rounds since 2024, from 4 sources
$500KSeed$2.0MPre-seed$9.5MSeed$7.1MSeed
- Latest round
- Seed, $7.1MFeb 2026
- Biggest round
- $9.5MSeed · Sept 2025
- Investors
- 10 (1 led)
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Seed, $500K Dec 2024
- Biggest round
- $9.5M Seed · Sept 2025
- Usual gap between rounds
- 5 months the median of 3
The rounds
- Feb 2026
- Sept 2025Seed$9.5M4 new
Reported by AlleyWatchSEC filing: $200K sold, first sale Jul 2025
- Jun 2025Pre-seed$2.0M2 new
Source recordedSEC filing: $200K sold, first sale Jul 2025
- Dec 2024
Who was in which round
The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Quick answers about Sphinx
How much has Sphinx raised?
Sphinx has raised $19M across 4 rounds since 2024.
When did Sphinx last raise?
Sphinx's most recent round was a Seed of $7.1M in Feb 2026.
What was Sphinx's biggest round?
Sphinx's largest round on record is $9.5M (Seed), in Sept 2025, led by Lightspeed Venture Partners.
Who backed Sphinx first?
Sphinx's first round on record, in Dec 2024, was backed by Y Combinator, Rebel Fund and SBXi Fund.
What stage is Sphinx at?
Sphinx's latest named round is a Seed, in Feb 2026.
Where is Sphinx based?
Sphinx is based in the United States.
Who led Sphinx's rounds?
Lightspeed Venture Partners led the Seed in 2025.
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