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Stack Exchange

Edtech · New York City, United States · Founded 2008

Free expert knowledge exchange for discussions on more than 90 topics from cooking to programming, photography to parenting MoreLess

Stack Exchange is a network of question-and-answer (Q&A) websites covering diverse fields, with each site dedicated to a specific topic. The platform operates on a user-driven model where content is generated and moderated by the community. Users ask and answer questions, and the community votes on the posts, which determines their visibility and the reputation of the users who contributed them.

The genesis of the network was Stack Overflow, a Q&A site for programming questions, created in 2008 by software developers and bloggers Jeff Atwood and Joel Spolsky. Atwood, known for his influential blog "Coding Horror," and Spolsky, author of the blog "Joel on Software," aimed to create a more efficient alternative to existing programmer forums. Atwood's background is in software development with a focus on the human elements of the field, while Spolsky previously worked as a program manager at Microsoft on the Excel team before founding Fog Creek Software. Following the success of Stack Overflow, they launched additional sites like Server Fault for system administrators and Super User for power users in 2009. The company raised $6 million in venture capital in May 2010 to focus on developing new subject-specific Q&A sites. This led to the public launch of the Stack Exchange network in January 2011. In June 2021, the parent company, Stack Exchange Inc., was acquired by the global investment group Prosus for $1.8 billion.

The company's business model is multifaceted, generating revenue primarily through advertising, a talent and recruitment platform, and a premium software-as-a-service (SaaS) product. Advertising on the high-traffic sites allows companies to reach a targeted, engaged audience. The talent division offers job listings and a CV search function for companies looking to hire technical professionals. The core of its enterprise offering is Stack Overflow for Teams, a private, secure knowledge-sharing and collaboration platform for companies. This product allows organizations to create their own internal Q&A communities, facilitating knowledge management and reducing internal friction. Stack Overflow for Teams is available in various tiers, including a business plan and an enterprise-grade solution, and integrates with popular workplace tools like Slack and Microsoft Teams.

The Stack Exchange network is distinguished by its system of self-moderation, driven by user reputation. Users earn reputation points and badges for their contributions, which grants them more privileges on the site, from voting to moderating content. This gamified approach encourages participation and helps maintain a high standard of quality for questions and answers. New community sites are proposed and vetted by users on a dedicated staging site called Area 51, ensuring that new topics have sufficient interest before launch. Keywords: Q&A platform, knowledge sharing, online community, developer community, technical questions, programming help, reputation system, user-generated content, Stack Overflow for Teams, knowledge management, enterprise collaboration, Jeff Atwood, Joel Spolsky, Prosus, developer hiring, tech recruitment, software development, IT support, technical knowledge base, community moderation

Company overview

Stack Exchange company information

The essential company record, classifications and operating signals in one place.

Status
Operational
Founded
2008
Headquarters
New York City, United States
Employees
3
Open positions
None listed
Dealroom signal
61.0
sectorKnowledge Managementbusiness modelSaaSsectorPeer-to-PeersectorLifelong and Consumer LearningsectorCommunity LearningindustryEducationindustryEnterprise Softwareclient focusb2c

Valuation & funding

Stack Exchange funding history

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
SERIES DOther financing Jan 2015 $40M $160M Index Ventures · Bezos Expeditions · Union Square Ventures · Andreessen Horowitz
SERIES BOther financing Mar 2011 $12M $48M Index Ventures · Union Square Ventures
SERIES AOther financing May 2010 $6M $24M Union Square Ventures · Micah Siegel · Dharmesh Shah · Bob Pasker
CORPORATE SPINOUTOther financing Jan 2010 $0 Fog Creek Software
Showing 4 recorded eventsUnlock the complete deal history →

Financials

Revenue and workforce over time

Available revenue and workforce history. Fields without reported data are omitted.

YearRevenueGrowthEmployees
2026 $200K 0% 3
2025 $200K 0% 2
2024 $200K 0% 1
2023 $200K -20% 4
2022 $250K 0% 4
2021 $250K +25% 5
2020 $200K 3
Company filings, research estimates and Dealroom dataOpen the full financial model →

Growth signals

Stack Exchange website traffic

Latest recorded traffic for Stack Exchange is 23M monthly website visits, down 17.9% over the last three months. Stack Exchange's team grew 50% over the past year.

Latest monthly visits23M 3-month web change-17.9% 1-year team growth+50%
Monthly website visits129 observations · Oct 2014–Jul 2026
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Comparisons

Stack Exchange compared with similar companies

Dealroom’s weighted taxonomy model identifies the closest operating peers. Company identity and context stay open; selected comparison metrics preview what is available in the platform.

Showing 8 of the closest matchesCompare every metric →

Talent graph

Stack Exchange's talent

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Team profiled 16 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 1 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Investors

12 investors on Stack Exchange's cap table

Sourced from Dealroom's funding and investor records. Investor profile links are shown where available.

Series A 8 investors entered at this stage
Series B+ 4 investors entered at this stage

Global footprint

Where Stack Exchange has talent and traffic

Workforce by country
1 countries with
team presence
🇮🇳 India100%
1 country shown

In the news

Latest news about Stack Exchange

Recent press, funding announcements, and product moves mentioning Stack Exchange — open to read from the original sources.

See all news

Market sentiment

What the market is saying about Stack Exchange

An AI-synthesized read of the highest-engagement posts about Stack Exchange on X over the past 7 days. We rank by likes & retweets, ignore corporate channels, and surface the themes that broke out from real people.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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