Segment
AcquiredYC S11YC Top CompanySan Francisco, US · Founded 2011 · Tennessee LLC · 550 employees · 15 known investors
Segment is a customer data platform that collects, unifies, and activates first-party customer data from multiple touchpoints, enabling businesses to create unified customer profiles and orchestrate personalized experiences across 750+ integrations and destinations.
Also known as Twilio Segment
Founders & leadership· Y Combinator alumni (S11)
Segment was founded in 2011 by Ilya Volodarsky, Calvin French-Owen, Peter Reinhardt, and Ian Taylor.

Investors · 15
Also in the syndicate · 1
Reported raises · per SEC filings
Form D private placements$975K disclosed across 1 of 2 rounds · 2017
▶$975KraisedNov 2017 · 12 investors · ResidentialRule 506(b)
- Jenn GarrettExecutive Officer
- Andrew BeairdExecutive Officer
- VP Holdings LLCDirector
- Mark DeutschmannExecutive Officer
- Offering amount
- $975K
- Amount sold
- $975K
- First sale
- Nov 2017
- Incorporated
- Limited Liability Company, Tennessee, 2017
- Federal exemptions
- 06b
Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.
Company profile
researched Aug 2026Segment is a customer data platform (CDP) offering software and APIs to collect, clean and control customer data. Businesses implement event tracking through a single Segment API rather than integrating a separate API for each downstream tool or database, and Segment then routes that data to analytics, marketing automation and data-warehouse destinations [2]. The product line is organized around Connections (a customer data pipeline that collects first-party data from every touchpoint and activates it to a data warehouse or one of 550+ destinations), and a combined CDP offering of Connections plus Unify and Engage for unified profiles, advanced audience building and real-time journey orchestration [0][1].
The company is now part of Twilio and is marketed as Twilio Segment; its website states that the Segment and Twilio sites are being merged, with Segment products, documentation and resources available and supported on Twilio.com, and that customers can combine Segment data with the wider Twilio platform for communications and AI [0][1]. Segment publishes an integrations catalog of 750+ integrations, plus recipes, GitHub libraries, documentation, a help center with an AI assistant, and a partner program for implementation and pre-built integrations [0][1].
Segment operates a public trust center describing its security and privacy program. Listed compliance frameworks include CCPA, GDPR, HIPAA, ISO/IEC 27001 (with a Statement of Applicability), ISO/IEC 27017:2015, ISO/IEC 27018:2019 and SOC 2, and the portal covers product security, data security, app security, access control, infrastructure (including Amazon Web Services), endpoint, network and corporate security, along with pentest and DR test reports [3].
Founding story
Segment was founded in 2011 and went through Y Combinator's Summer 2011 batch [2]. Three of the founders, including CEO Peter Reinhardt, dropped out of MIT to take part in the program [4]. The team spent about a year and a half pivoting without product-market fit, first building a classroom lecture tool and then an analytics tool, with roughly six months of runway remaining when they released a simple open-source JavaScript library on Hacker News; the strong response, and user requests for a hosted version, led to the pivot into a customer data platform [6]. A secondary profile lists the founders as Peter Reinhardt, Ilya Volodarsky, Calvin French-Owen and Ian Storm Taylor, motivated by the difficulty of collecting and managing customer event data across multiple platforms [5].
Business model
Segment sells a software/API platform on a self-serve and sales-assisted basis, with a free entry point ("Start for free"), published pricing pages for Connections and for the full CDP bundle, and a "Contact sales" motion for larger deals [0][1]. A description of its differentiation cites flexible pricing models scaling from startups to enterprises [5].
Subscription/usage-based software pricing for the Connections pipeline and the Connections + Unify + Engage CDP bundle, with separate published pricing for each product line [0][1]. Company history includes a period of growth around $12-13M ARR and a subsequent $20M ARR milestone reached after a pricing and packaging overhaul [6].
Traction
More than 15,000 customers as of July 2017, including Intuit, Atlassian and Gap [4]. Team size of 550 per Y Combinator [2]. A secondary profile states Segment serves over 25,000 companies and processes trillions of API calls annually [5]. The company reached roughly $12-13M ARR during a period of stalled growth and later hit a $20M ARR goal [6].
▸Full profile — market position, technology, go-to-market, geography, history, risks & controversies
Market position
Positioned as a central customer data platform sitting between a company's data sources and its analytics and marketing tools; CEO Peter Reinhardt argued that rather than consolidating, the marketing/analytics tool landscape continues to fragment into specialized tools, increasing demand for data infrastructure that connects them [4]. Y Combinator classifies the company as SaaS/B2B [2].
A single API and large integration catalog remove the need to implement each downstream tool separately, and more than 200 tools had been built on top of Segment as of 2017, about 30% of them by third-party partners rather than Segment [4][2]. Additional cited differentiators include real-time event-driven collection, identity resolution and audience activation in one suite, warehouse-centric zero-copy architecture, developer tooling (SDKs, APIs, Terraform provider), and privacy/compliance capabilities [5][3].
Technology
A single event-collection API and SDK set gathers first-party data from websites, apps, servers and cloud services, then cleans and routes it in real time to a data warehouse or to 550+ destinations, with a broader catalog of 750+ integrations [0][1][2]. Layered products provide identity resolution and unified profiles (Unify) and audience building and journey orchestration (Engage), including use of warehouse data to enhance experiences [0][1]. Secondary descriptions characterize the architecture as event-driven with zero-copy use of the data warehouse as a source of truth, high-capacity event streaming, SDK libraries, pre-built integrations, and infrastructure-as-code support via APIs and a Terraform provider [5]. Infrastructure runs on Amazon Web Services and includes virtual private cloud, firewall, SIEM, logging and access-monitoring controls [3].
Go-to-market
Developer-led and self-serve entry via free sign-up, documentation, open-source libraries on GitHub, recipes and an integrations catalog, combined with a direct sales motion ("Contact sales") and a partner ecosystem for implementation and pre-built integrations [0][1]. Distribution now also runs through the Twilio platform and Twilio.com following the website merger [0][1]. Early growth came from launching an open-source JavaScript library on Hacker News, which reached the top of the site and generated thousands of GitHub stars and email signups, revealing demand for a hosted service [6].
Digital businesses of all sizes needing to unify fragmented customer data, spanning startups through large enterprises; named customers include Intuit, Atlassian and Gap, and data sources integrated include Stripe, Salesforce, Mailchimp and Zendesk [4]. Segment was initially adopted by startups, with the company later targeting large enterprises [4].
Geography
Headquartered in San Francisco [2][5]; the referenced sources do not detail additional office locations.
History
Founded in 2011 out of Y Combinator's Summer 2011 batch [2], Segment pivoted to customer data infrastructure after an open-source launch on Hacker News [6]. It raised a $64M Series C in July 2017 led by the Y Combinator Continuity Fund and GV, bringing total funding to $109M at the time, with Ali Rowghani joining the board [4]. A fractional CFO engagement beginning shortly after the seed round supported financial strategy, including a shift to annual prepayment terms to reduce burn; the company later worked through a growth slowdown at $12-13M ARR before reaching $20M ARR [6]. Segment was acquired by Twilio in a $3.2 billion deal, and Y Combinator lists its status as acquired [6][2]. Co-founder and CEO Peter Reinhardt subsequently became CEO of Charm Industrial [6]. In its current form the business operates as Twilio Segment, with its website being consolidated into Twilio.com [0][1].
Risks & controversies
One aggregator profile lists Segment's status as "Inactive" and reports $286.6M raised across five rounds, which conflicts with Y Combinator's "Acquired" status and with the $109M total funding reported at the 2017 Series C; these figures could not be reconciled from the available sources [5][2][4]. The consolidation of segment.com into Twilio.com indicates the brand is being folded into the parent company's web presence [0][1].
Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Founder mafia
2 people who came through Segment went on to found or lead other companies.
Competitors · 10
by search overlapCompanies competing with Segment for the same Google search keywords, organic and paid, via search-intersection analysis.
Timeline · 5
launches, deals, and filingsSegment announced it is merging its website into Twilio.com, where the same CDP products, documentation, resources and support are available.
Segment was acquired by Twilio in a deal described as a $3.2 billion exit; Y Combinator lists the company's status as acquired, and Segment now operates as Twilio Segment.
$3.2B source ↗
Series C of $64 million led by the Y Combinator Continuity Fund and GV, with participation from existing investors Accel, Thrive Capital, SV Angel and NEA; brought total funding to $109M.
$64M source ↗
As part of the Series C, Y Combinator Continuity Fund lead and former Twitter COO Ali Rowghani joined Segment's board.
Segment participated in Y Combinator's Summer 2011 batch; three founders, including CEO Peter Reinhardt, dropped out of MIT to attend.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
Legal entities · 1
corporate structureIn the news
▸Research sources · 8
primary sources listed
- Segmentsegment.com · web
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Segment do?
- Twilio-owned customer data platform that collects, unifies and routes first-party customer data to hundreds of tools.
- Who founded Segment?
- Segment was founded by Ilya Volodarsky, Calvin French-Owen, Peter Reinhardt, Ian Taylor in 2011.
- Who are Segment's investors?
- Segment's investors include Accel, Converge, Founders Circle Capital, Greycroft, GV (Google Ventures), Headline, Headline Growth Management, LLC, Kleiner Perkins and 6 more.
- How much funding has Segment raised?
- Segment has disclosed $975K raised across 1 of its 2 known rounds.
- Where is Segment headquartered?
- Segment is headquartered in San Francisco, US.









