Fundraising Fox

Fixie

Seattle, US · Founded 2022 · Delaware corporation · 4 known investors

Fixie.ai (Ultravox) is a research lab and product company that builds a speech-native voice AI model and inference infrastructure, offering developer APIs and SDKs for creating real-time conversational voice agents. It serves developers and companies building voice AI applications, with telephony integrations and usage-based pricing.

AI & Machine LearningDeep TechDeveloper ToolsEnterprise Software

Founders & leadership

Fixie was founded in 2022 by Zach Koch and Matthew Welsh.

ZK
Zach KochFounder
MW
Matthew WelshCo-founder

Board

JGJocelyn Goldfein
Jocelyn Goldfeinin𝕏Board directorInvestor at Zetta Venture Partners

Investors · 4

SignalFireSan Francisco · $250K – $15M
Madrona Venture GroupreportedSeattle · $2M – $10M
Redpoint VenturesreportedWoodside · $100K – $10M
Zetta Venture PartnersreportedSan Francisco · $1M – $5M

Reported raises · per SEC filings

Form D private placements

$16.5M disclosed across 2 of 3 rounds · 2022–2025

▶$11.5MraisedApr 2023 · 7 investors · Other
Rule 506(b)
Fixie.ai raises $17M to build the SDK for LLMsblog.fixie.ai · Apr 2023
Officers, directors & promoters on the filing
  • Matthew WelshExecutive Officer, Director
  • Zachary KochDirector
  • Jocelyn GoldfeinDirector
Offering amount
$11.5M
Amount sold
$11.5M
First sale
Mar 2023
Incorporated
Corporation, Delaware, 2022
Federal exemptions
06b
Full filing on SEC EDGAR ↗
▶$5MraisedJul 2022 · 5 investors · Other
Rule 506(b)
Officers, directors & promoters on the filing
  • Jocelyn GoldfeinDirector
  • Zachary KochDirector
  • Matthew WelshExecutive Officer, Director
Offering amount
$5M
Amount sold
$5M
First sale
Jul 2022
Incorporated
Corporation, Delaware, 2022
Federal exemptions
06b
Full filing on SEC EDGAR ↗

Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.

In the news

Fixie.ai Raises $12M to Pioneer AI That Communicates Like Humans | SignalBasetrysignalbase.com · May 2025Fixie.ai raises $17M to build the SDK for LLMsblog.fixie.ai · Apr 2023Fixie Raises $17 Million To Help Companies Integrate LLMs Into Software Stackspulse2.com · Apr 2023Fixie raises $17M to help developers build large language models into their apps - SiliconANGLEsiliconangle.com · Mar 2023AI startup Fixie raises $17M in seed round led by Redpoint Ventures - Puget Sound Business Journalbizjournals.com · Mar 2023Fixie wants to make it easier for companies to build on top of language models | TechCrunchtechcrunch.com · Mar 2023Fixie Raises $17M in Seed Fundingfinsmes.com · Mar 2023

Frequently asked questions

What does Fixie do?
Fixie.ai (Ultravox) is a research lab and product company that builds a speech-native voice AI model and inference infrastructure, offering developer APIs and SDKs for creating real-time conversational voice agents. It serves developers and companies building voice AI applications, with telephony integrations and usage-based pricing.
Who founded Fixie?
Fixie was founded by Zach Koch, Matthew Welsh in 2022.
Who are Fixie's investors?
Fixie's investors include SignalFire, Madrona Venture Group, Redpoint Ventures, Zetta Venture Partners.
How much funding has Fixie raised?
Fixie has disclosed $16.5M raised across 2 of its 3 known rounds.
Where is Fixie headquartered?
Fixie is headquartered in Seattle, US.