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Stack Overflow funding, valuation and investors
Developer Q&A community and Teams enterprise knowledge platform.
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Funding, valuation & investors
Answer-first snapshotLatest funding
Series E
$85M · July 2020
Latest known valuation
Not publicly disclosed
Total disclosed equity funding
$85M
Excludes debt, grants, acquisitions, secondaries, and IPO proceeds.
Current status
acquired
acquired · New York, New York
Investors in latest funding
Other: Andreessen Horowitz , Spark Capital , Union Square Ventures , Index Ventures
Latest tracked event: Acquisition (June 2021). It is shown separately because it is not counted as disclosed equity funding.
Overview
Stack Overflow operates the largest developer Q&A community on the web plus Stack Overflow for Teams, an enterprise private knowledge base. Founded by Joel Spolsky and Jeff Atwood in 2008, the platform became the canonical source for programming error solutions. a16z participated in $85M Series E in 2020. Prosus acquired Stack Overflow in June 2021 for $1.8B.
Why Stack Overflow is interesting
Default stack for programming answers — a16z in Series E before Prosus $1.8B acquisition; now central to AI coding training data debates.
Product & use cases
Stack Overflow public site hosts 23M+ questions; Teams product provides searchable internal Q&A for engineering orgs with integration into Slack and Microsoft tools.
- Public developer Q&A and reputation system
- Enterprise internal knowledge base for engineering
- AI training data source (licensed separately)
- Recruiting via developer reputation scores
Key facts
- Prosus acquisition (Jun 2021): $1.8B
- Series E (Jul 2020): $85M with a16z, Spark, USV, Index
- Largest developer Q&A community globally
- AI traffic impact and data licensing debates 2023+
Funding history (newest first)
Acquisition
2021-06 $1.8B- Prosus (lead)
Source: https://stackoverflow.co/company/press/archive/prosus-acquires-stack-overflow
Investors in our directory
Funds linked from Stack Overflow's profile — open a fund page for stage focus and related deal articles.
Competitive landscape
Edge: Network effects from decade of answered questions — Google often surfaces Stack Overflow as top programming result.
Stack Overflow's public traffic challenged by AI assistants scraping answers. Teams enterprise and data licensing pivot monetizes archive beyond ads.
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GitHub Discussions adjacent
Repo-adjacent Q&A; less canonical than SO for errors.
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Discord dev communities adjacent
Real-time help; less searchable archive.
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ChatGPT / AI assistants direct
AI answers reduce new SO questions — traffic impact 2023+.
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Notion / Confluence adjacent
Enterprise docs; Teams competes for internal knowledge.
Notable stories
- Stack Overflow became so essential that 'just Google the error' meant Stack Overflow — cultural default for a generation of developers.
- Prosus (Naspers) bought SO for Teams enterprise growth and strategic AI data asset as LLM training value emerged.
Industries
Related funding articles
Venture Capital Tracker pieces that cover Stack Overflow's financing or category context.
FAQs about Stack Overflow
Practical answers founders, operators, and investors typically search for.
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