Customer.io is a customer engagement and marketing automation platform that uses first-party data to send personalized email, SMS, and push notifications. It helps businesses automate messaging and build data-driven customer journeys across channels.
Access to pre-IPO shares is available to accredited investors through UpMarket.
Customer.io shares are not on public exchanges. UpMarket provides accredited investors access through secondary market transactions.
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| Date | Round | PPS (split-adj.) | Valuation |
|---|---|---|---|
| 2022 | Series A |
GetLatka says Customer.io reached $100M ARR in 2025, up from $70M in 2024. The same source values the private company at $690M and notes $40.3M raised across 6 rounds.
CEO Colin Nederkoorn said Customer.io serves over 7,000 companies and grew from $50 MRR to $70M ARR through content education and organic demand. The company positions itself around personalized messages driven by customer behavior and actions.
Customer.io's 2026 messaging trends page says marketers should segment by what customers do, not just who they are. Its playbook also outlines weekly performance reviews and AI-assisted recommendations for upcoming campaigns.
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No. As of March 2026, Customer.io is a private company and does not trade on any public stock exchange. Accredited investors can access Customer.io shares through UpMarket, a FINRA-registered broker-dealer that specializes in pre-IPO investments.
Customer.io does not have a public stock price because it is privately held. The most recent known share price comes from its last funding round. Pre-IPO share prices on the secondary market may differ from the last round price depending on supply, demand, and market conditions.
Yes. Accredited investors can indicate interest in Customer.io shares through UpMarket by filling out the form on this page or creating an account at upmarket.co. All pre-IPO offerings are subject to availability and require a $50,000 minimum investment. UpMarket is a FINRA-registered broker-dealer and has brokered alternative investments since 2019.
Pre-IPO investments carry significant risks. Customer.io shares are illiquid, meaning there is no public market to sell them quickly. There is no guaranteed exit timeline or return. The investment is speculative in nature, and investors should be prepared for the possibility of total loss. Valuations of private companies can fluctuate substantially between funding rounds. Investors should consult their financial advisor and review all offering documents before investing.
In a pre-IPO transaction, accredited investors purchase shares from existing shareholders (such as employees, early investors, or other holders) through secondary market platforms. The company itself does not issue new shares in these transactions. UpMarket facilitates these trades as a FINRA-registered broker-dealer, handling compliance, documentation, and settlement on behalf of both parties.
There are two primary exit paths for pre-IPO holdings: selling your shares on the secondary market to another buyer, or holding until the company completes an IPO or is acquired. Both paths are subject to transfer restrictions, company approval (right of first refusal), and market conditions. The timing of any exit is unpredictable, and investors should plan for a multi-year holding period.
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UpMarket's valuation estimate is derived from a proprietary model that incorporates multiple data sources: funding round data (Caplight), revenue estimates (Sacra), secondary market pricing, and public company comparables. The model applies a private company discount to the public comp multiple to account for illiquidity and information asymmetry. This estimate is not investment advice and may differ substantially from the price at which shares actually trade.
Customer.io uses first-party data to power personalized email, SMS, and push marketing automation, and said 2025 revenue reached $100M ARR, up 43%, as it expands its customer engagement platform. Accredited investors can access Customer.io stock through UpMarket.