/Companies

Apollo.io

Unicorn · $1.6BYC W16

San Francisco, US · Founded 2015 · 800 employees · Hiring · 25 known investors

Find your way into Apollo.io

Sign up to see every warm intro you have to Apollo.io

  • Paths you didn't know you had: your email and LinkedIn already hold routes to the Apollo.io team. We find them for you
  • 2nd- and 3rd-degree connections: the friend-of-a-friend routes that take hours to manually find through your inbox or LinkedIn
  • Answers now, not in days: momentum is everything in a raise. Skip asking around whether someone knows someone

Days of research, done the moment you sign in, with every route ranked by how warm it is.

Apollo provides an AI-powered platform designed for go-to-market teams to improve sales and marketing productivity. The platform offers features like prospect data, email tracking, and custom scoring to help sales and marketing professionals work more efficiently.

Also known as ZenLeads Inc. · ZenProspect · Apollo

AI & Machine LearningEnterprise SoftwareMarketing TechSales TechSalesMarketingUnited States of AmericaAmerica / CanadaFully Remote

Founders & leadership· Y Combinator alumni (W16)

Apollo.io was founded in 2015 by Tim Zheng and Ray Li.

TZTim Zheng
Tim ZhengCEO
RLRay Li
Ray LiCo-founder, CTO
MCMatt Curl
Matt CurlChief Executive Officer
MA
Marcio ArneckeChief Marketing OfficerHe joined the company in March 2025 to lead go-to-market strategy.
ACAdam Carr
Adam CarrChief Revenue OfficerAdam Carr joined Apollo as Chief Revenue Officer in March 2025. He has experience building go-to-market strategies that combine product-led and sales-led growth approaches.
PMPhil Moon
Phil MoonChief Financial Officer
RPRalph Pyne
Ralph PyneChief Information Security Officer
RN
Rachel NobleSVP of PeopleRachel Noble is SVP of People at Apollo.io, an AI-powered platform for go-to-market teams. She has experience building global teams and designing organizational programs across corporate functions.
ASAlexa Summer
Alexa SummerGeneral Counsel
JM
Jenn ManacmulTechnical Recruiter
AL
Aidan LiEngineering Manager
DR
Didier RamosManager of Talent Acquisition

Investors · 25

Pathlight Ventureslisted by Pathlight VenturesOld Bridge · $500K – $5M

How we know: a partner's Signal profile · Y Combinator's founder network · Not right? Tell us

Struck Capitallisted by Struck CapitalSanta Monica · $500K – $2M

How we know: the VCSheet dataset · Y Combinator's founder network · Not right? Tell us

ZhenFundlisted by ZhenFundBeijing · $250K – $3M

How we know: ZhenFund's portfolio page · the VCSheet dataset · Y Combinator's founder network · Not right? Tell us

Sv Tech Ventures, Inc.reportedPalo Alto

How we know: Y Combinator's founder network · Not right? Tell us

Tribe CapitalreportedSan Francisco · $25K – $40M

How we know: a partner's Signal profile · the VCSheet dataset · research · prnewswire.com · Y Combinator's founder network · Not right? Tell us

Willett AdvisorsreportedNew York

How we know: Y Combinator's founder network · Not right? Tell us

Funding

SEC filings, press & company announcements

Source: company announcements and press reports — follow each round's link for the claim.

Valuation · disclosed

Disclosed events
$1.6BvaluationAug 2023
filing ↗
$900Mvaluation at Series CMar 2022
filing ↗

Source: SEC prospectus filings, and round valuations the company or its investors disclosed — follow each entry's link for the claim.

The YC application· Winter 2016 batch

Company profile

researched Aug 2026

Apollo.io operates an all-in-one go-to-market platform for B2B sales and marketing teams, pairing a proprietary contact and company database with prospecting, outreach automation, data enrichment and deal-execution tooling. The company markets the product as a replacement for separately purchased data providers, outreach platforms, dialers, enrichment tools and CRMs. Its website advertises 240M+ contacts and 30M+ company records, verified emails and phone numbers, advanced filtering by attributes such as job title, seniority, company size, industry, location and buyer intent, and integrations that sync contacts, activity history and campaigns with CRMs including Salesforce and HubSpot.

Core product areas are grouped into outbound (multichannel AI-assisted campaigns, email deliverability guardrails, prioritized task lists, workflow automation), inbound (anonymous website visitor identification, real-time form enrichment, lead routing with built-in scheduling, automated nurture sequences), data enrichment (record cleansing and refresh across the CRM and wider stack), and deal execution (pre-meeting insights, AI call summaries and follow-ups, pipeline boards, conversation analytics and coaching dashboards). Earlier product milestones described by sources include an international dialer, an automated prospecting engine, a widely used LinkedIn/Chrome browser extension, intent data embedded into the free tier, an AI writing assistant, and a 2023 AI-powered sales execution platform with machine-learning timing and messaging recommendations.

The website lists compliance and certification marks including GDPR, SOC 2, CCPA, ISO/IEC 27001, CASA Tier 2, CPRA, EU-US DPF and PCI DSS. Management has stated that SOC-2 and ISO-27001 certifications have been obtained annually since 2019 following a 2018 data breach.

Founding story

The company was incorporated in 2015 in San Francisco as ZenProspect by Tim Zheng together with co-founders identified across sources as Ray Li and Roy Chung, targeting the fragmentation of the sales stack and the large share of rep time consumed by manual data entry and tool switching. It went through Y Combinator's Winter 2016 batch, receiving roughly $120,000 in seed support, and found early traction among tech companies in its cohort. Zheng, an engineer who had previously founded Brainscape, remains CEO.

Business model

Apollo.io sells software-as-a-service subscriptions on a freemium basis: users can sign up free without a credit card, with paid tiers adding capacity and features such as live personalized onboarding. During the 2020 pivot the company introduced self-serve SMB pricing around $99 per month in place of enterprise-style annual contracts exceeding $10,000, then expanded upward toward mid-market and enterprise buyers. Only a minority of registered users pay: at the March 2022 Series C, roughly 16,000 paying businesses represented about 10% of the total user base.

Recurring subscription revenue from tiered plans, monetized by converting free self-serve users into paid seats and expanding accounts over time. The company reported roughly 3x revenue growth in the year preceding its Series B and again cited approximately 3x year-over-year revenue growth in 2022, surpassing $100M ARR within 24 months of its PLG pivot.

Traction

Reported traction grew from nearly 9,000 paying customers and about 168,000 companies with over one million users in November 2021, to more than 16,000 paying businesses and roughly 160,000 companies (about one million individuals) by March 2022. The company reported more than 400% growth in weekly active users and 18 consecutive months of profitability at the time of the Series B, over $100M ARR by 2025, and cash-flow positive operations. The company website currently claims over 600,000 companies using the platform. Customer-cited outcomes on the website include a 70% increase in sales leads, 4x SDR efficiency and 64% lower tech stack costs.

Latest developments

The current website positions Apollo as an AI sales platform spanning outbound, inbound, data enrichment and deal execution, citing over 600,000 companies on the platform and 240M+ contacts. Recent company communications referenced on PR Newswire include a ranking on the Inc. 5000 together with a MarTech Breakthrough Award and G2 recognition, and the publication of Apollo's 2026 AI in Sales & Go-to-Market Survey, which reported that only 6% of go-to-market leaders think AI will replace their teams.

▸Full profile — market position, technology, go-to-market, geography, history, risks & controversies

Market position

Apollo.io competes in the crowded sales intelligence and engagement market against both point solutions and all-in-one platforms, with named competitors including ZoomInfo, Outreach, SalesLoft, HubSpot, Cognism, Reply.io, Seamless.AI, Lusha and Clearbit. Its positioning emphasizes bundling data plus engagement in one lower-cost platform aimed at segments underserved by legacy enterprise vendors. Sources cite top rankings on G2 in sales intelligence, lead intelligence, marketing account intelligence and sales engagement categories, and a reported Forbes Cloud 100 placement in 2023; Forbes maintains a company profile listing the firm under Business Products & Software Services.

Sources identify three main differentiators: the breadth and freshness of the contact database sourced through crowdsourced contribution and crawling; the bundling of data, engagement, dialing, enrichment and CRM-adjacent functionality into a single purchase that the company says replaces roughly five separate tools; and freemium accessibility that places advanced signals such as intent data inside a free tier, lowering adoption friction relative to enterprise incumbents.

Technology

The platform is built on large-scale data acquisition and analytics: proprietary web crawling and a community/contributory data network that crowdsources and cross-verifies contact records, described by the company as producing 200+ business attributes per record, real-time flagging when prospects change jobs, and a real-time verification engine to counter data decay. Analytical and machine-learning components support lead scoring and targeting, timing and messaging recommendations, generative writing assistance, call transcription and summarization, and workflow automation, with bidirectional CRM synchronization.

Go-to-market

Product-led growth is the primary motion. After abandoning a high-touch sales-led approach in 2020, the company relied on freemium self-serve onboarding, a viral browser/LinkedIn extension popular with SDRs and recruiters, and a "Discovery SEO" tactic that indexed millions of contact and company landing pages to capture high-intent organic search traffic. Management states that more than 90% of new users arrive through organic channels, with most inbound traffic coming from branded search. Paid tiers and enterprise expansion layer a sales motion on top of self-serve adoption.

B2B sales, marketing and revenue teams, spanning startups and SMBs — the segment the company deliberately targeted after 2020 — through mid-market and Fortune 500 enterprises. Typical users are sales development representatives, account executives, founders and recruiters.

Geography

Headquartered in San Francisco, California, United States, with a globally distributed user base and remote engineering roles advertised across the US. Compliance marks referenced include GDPR, CCPA/CPRA and the EU-US Data Privacy Framework, indicating operations serving European and US customers.

History

Founded 2015 as ZenProspect and accelerated through Y Combinator Winter 2016, the company expanded its contact database from roughly 100 million to more than 200 million records between 2018 and 2020 and rebranded to Apollo.io in 2018 — the same year a breach exposed its roughly 200-million-record prospect database. By 2020 the sales-led model had stalled with negative unit economics and six months of runway, prompting a pivot to freemium product-led growth aimed at SMBs. Growth followed: a $32M Series B led by Tribe Capital in November 2021, a $110M Series C led by Sequoia Capital announced in March 2022 at roughly $900M post-money, and a reported $100M round at a $1.6B valuation in August 2023. Headcount rose from about 50 to 150+ after the Series B and is listed at 800 on the company's Y Combinator profile.

Risks & controversies

In 2018 the company suffered a data breach in which its prospects database of roughly 200 million records was stolen after a system upgrade exposed network vulnerabilities; some customer data was also affected. Apollo characterized the prospect data as publicly available and not sensitive, though commentators noted the risk of the data feeding phishing and targeted attacks and raised questions about data security practices. The company says it subsequently overhauled technical, HR and compliance infrastructure and has held SOC-2 and ISO-27001 certifications annually since 2019, and re-architected infrastructure for GDPR and CCPA compliance in 2022. Other risks noted in sources include intense competition from larger sales-tech incumbents, a low free-to-paid conversion share (about 10% of users paying as of 2022), and prior near-failure from unsustainable customer acquisition economics.

Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.

Key figures

latest reported
Annual recurring revenueJan 2025$100M
Companies in databaseJan 202630,000,000 companies
Companies using the platformJan 2026600,000 companies
Consecutive months of profitabilityNov 202118 months
Contacts in databaseJan 2026240,000,000 contacts
HeadcountAug 2026782
Paying customersMar 202216,000 customers
Post-money valuationMar 2022$900M
Prospect database sizeMar 2022220,000,000 records
Registered usersNov 20211,000,000 users
Self-serve entry priceJan 2025$99
Share of new users from organic channelsJan 202590%
Team sizeJan 2026800 employees
ValuationJan 2025$1.6B
Weekly active user growthNov 2021400%

Company-reported or press-reported figures, each dated to when it was claimed — not independently audited.

Founder mafia

4 people who came through Apollo.io went on to found or lead other companies.

Related companies · 10

Zendesk New YorkThis is Zendesk's internal belonging/diversity and inclusion program page, not a company profile page for an external company. It describes Zendesk's internal culture initiatives and leadership development programs.
Surface LabsSurface Labs builds AI-native marketing automation software that unifies data and campaign execution across channels, replacing fragmented rule-based marketing technology platforms. The platform serves marketing teams at enterprises and scales companies.
PipedrivePipedrive is a cloud-based customer relationship management (CRM) platform designed for small and medium-sized businesses to manage sales pipelines, track leads, and automate sales processes. The platform provides visual sales funnel management, email marketing integration, customer tracking, and reporting tools to help sales teams close more deals efficiently.
AptenApten builds AI agents that automate student enrollment workflows for educational institutions across SMS, phone, email, and web channels. The platform manages student communications throughout their lifecycle—from prospecting to re-engagement—while maintaining conversation context across all touchpoints and integrating with existing CRM and admissions systems.
CloseClose is a CRM platform that provides sales software for businesses, emphasizing communication features and automated data entry to improve sales representative productivity.
VesselVessel is a developer-first platform that enables companies to integrate with customer-facing applications through a unified API, webhooks, and managed data pipelines. It handles authentication, permission management, rate limiting, and data synchronization across multiple third-party apps.
CognismCognism is a B2B sales intelligence platform that provides accurate, compliance-focused contact and company data for revenue and go-to-market teams. It focuses on serving sales teams selling into and across EMEA and European markets, with additional presence in the US.
ZorbaZorba is an all-in-one platform for sourcing, renovating, leasing, and managing single-family rentals and build-to-rent properties. The platform uses proprietary data, analytics, and AI-driven technology to identify undervalued properties, automate workflows, and connect operators with renovation and property management partners.
YarnYarn is an AI-powered video creation platform that helps startup teams produce content at scale using generative talking heads, product demo automation, and AI-assisted editing. The platform serves sales, marketing, and go-to-market teams who need to create personalized video content quickly.
DealHubDealHub provides a revenue platform that manages sales engagement touchpoints to improve buyer experience and sales team efficiency.

Companies working in the same space as Apollo.io.

Timeline · 7

launches, deals, and filings
Jan 2026
Inc. 5000 ranking, MarTech Breakthrough Award and G2 recognition

PR Newswire listing of a related Apollo release announcing a ranking on the Inc. 5000 and a MarTech Breakthrough Award alongside G2 recognition.

source ↗

Aug 2023
Apollo.io raises $100M at a $1.6B valuation

Referenced in Y Combinator's 'Latest News' listing of a TechCrunch article dated Aug 29, 2023: 'Apollo.io, a full-stack sales tech platform, bags $100M at a $1.6B valuation'.

$100M source ↗

Jan 2023
Launch of AI-powered Sales Execution Platform

Secondary-source account of a 2023 launch of an AI-powered sales execution platform providing machine-learning recommendations on contact timing and messaging scripts; the same source cites a Forbes Cloud 100 listing that year.

source ↗

Mar 2022
Apollo.io raises $110M Series C led by Sequoia Capital

Series C announced March 3, 2022; PitchBook recorded the round as closing in January 2022. TechCrunch cited a $910M post-money per PitchBook, later confirmed with an Apollo source as $900M post-money.

$110M source ↗

Nov 2021
Apollo.io announces $32M Series B led by Tribe Capital

Series B round announced via press release; Sri Pangulur, partner at Tribe Capital, joined Apollo.io's board in tandem with the round.

$32M source ↗

Jan 2018
Rebrand from ZenProspect to Apollo.io

The company, founded in 2015 as ZenProspect, rebranded as Apollo.io in 2018.

source ↗

Jan 2018
Data breach exposing prospects database

In 2018 Apollo discovered that its prospects database, then containing around 200 million records, was stolen by hackers after a system upgrade exposed network vulnerabilities; some customer data was also involved. The company said the prospect data was publicly available information and subsequently revamped its technical, HR and compliance infrastructure, obtaining SOC-2 and ISO-27001 certification each year since 2019.

source ↗

Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.

Legal entities · 1

corporate structure
ZenLeads Inc.

In the news

▸Research sources · 8

primary sources listed

8 public sources were cited for this profile; the first-party ones are listed here.

Frequently asked questions

What does Apollo.io do?
Apollo.io is a B2B sales intelligence and engagement platform combining a large contact database with outbound and AI workflow tools.
Who founded Apollo.io?
Apollo.io was founded by Tim Zheng, Ray Li in 2015.
Who are Apollo.io's investors?
Apollo.io's investors include A*, Angel Collective Opportunity Fund, Bain Capital Ventures, Gaingels, Jude Gomila, NewView Capital, Pascal Capital, Pathlight Ventures and 17 more.
Where is Apollo.io headquartered?
Apollo.io is headquartered in San Francisco, US.