Klaviyo
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Investors
Founders
About
Klaviyo is a marketing automation and customer data platform headquartered in Boston, MA, founded in 2012 by Andrew Bialecki and Ed Hallen 1. The company provides email and SMS marketing tools primarily for e-commerce businesses, integrating with platforms like Shopify, Magento, and BigCommerce 2. Klaviyo IPO’d on the NYSE under ticker KVYO on September 20, 2023, priced at $30 per share, valuing the company at approximately $9.2 billion 3.
Funding History
| Date | Round | Amount | Lead | Co-investors |
|---|---|---|---|---|
| Aug 2015 | Seed | $1.5M | Astral Capital | — 4 |
| Aug 2017 | Series A | $7M | Astral Capital | — 4 |
| Apr 2019 | Series B | $150M | Summit Partners | — 5 |
| Nov 2020 | Series C | $200M | Accel | Summit Partners 6 |
| May 2021 | Series D | $320M | Sands Capital | Counterpoint Global, Whale Rock Capital, ClearBridge Investments, Lone Pine Capital, Owl Rock Capital, Glynn Capital, Keith Block, Accel, Summit Partners 2 |
| Aug 2022 | Strategic | $100M | Shopify | — 7 |
| Sep 2023 | IPO | $576M | — | NYSE: KVYO at $30/share 3 |
Total private funding: ~$778M 4.
What Investors Say
Michael Clarke, Managing Director, Sands Capital (Series D lead):
“Klaviyo has become the standard for how many online businesses are interacting with their customers, empowering an all-around better way of doing business and redefining what it takes for them to achieve independent success.” 2
Ping Li, Partner, Accel (Series C):
“The e-commerce boom spurred by the pandemic has driven the customer experience to exist primarily online, an environment where personalization is paramount.” 6
Michael Medici, Managing Director, Summit Partners (Series C, Board Member):
“The Klaviyo team blends product vision, technical talent and customer centricity — and we believe the company’s growth trajectory underscores the true power of this combination.” 6
Summit Partners (firm statement): Summit identified Klaviyo as demonstrating “an uncompromising commitment to the customer, a strong product-market fit, and a relentless focus on cash-efficient growth.” 8
What Founders Say
Andrew Bialecki, CEO & Co-Founder (on founding philosophy):
“We didn’t want to be one of the startups that raises a $1M, builds a product, finds some customers, never gets profitable and gets acquired by some bigger company for $10M.” 5
Andrew Bialecki (on owned channels):
“The bill of goods that’s being sold is that you need third-party data and infrastructure to succeed, and that’s simply not true. Email and SMS are the most direct channels there are. Owning relationships with consumers will help businesses become closer to their customers, more durable, and more profitable.” 2
Andrew Bialecki (on IPO):
“We have a saying here at Klaviyo that we’re only 1% done. That’s never been more true than today, as Ed Hallen and I rang the bell at the NYSE and #KVYO was introduced to the world under the bright lights.” 9
Sources
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Klaviyo “About” page, accessed March 2026. https://www.klaviyo.com/about↩
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PR Newswire, “Klaviyo Raises $320 Million in Series D Funding,” May 18, 2021. https://www.prnewswire.com/news-releases/klaviyo-raises-320-million-in-series-d-funding-following-surge-in-demand-for-data-and-marketing-automation-platform-301293305.html↩↩↩↩
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CNBC, “Klaviyo valued at $9.2 billion after pricing IPO above range,” September 19, 2023. https://www.cnbc.com/2023/09/19/klaviyo-considers-pricing-ipo-at-top-of-range-or-above-reuters.html↩↩
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Tracxn, “Klaviyo Funding Rounds & List of Investors,” accessed March 2026. https://tracxn.com/d/companies/klaviyo/__a3CbbINSRMVrdfW-jgtWtBmw5pTden8hW7uXPkbmnQw/funding-and-investors↩↩↩
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MediaPost, “Klaviyo Raises $150 Million In Series B Funding,” April 8, 2019. https://www.mediapost.com/publications/article/334248/klaviyo-raises-150-million-in-series-b-funding.html↩↩
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Summit Partners, “Klaviyo Raises $200 Million in Series C Funding,” November 17, 2020. https://www.summitpartners.com/news/klaviyo-raises-200-million-in-series-c-funding-to-accelerate-growth-for-superior-e-commerce-experiences-owned-marketing-results↩↩↩
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TechCrunch, “Shopify makes $100M strategic investment in marketing automation startup Klaviyo,” August 2, 2022. https://techcrunch.com/2022/08/02/shopify-makes-100m-strategic-investment-in-marketing-automation-startup-klaviyo/↩
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Summit Partners, “Klaviyo: From Bootstrapped Beginnings to IPO,” accessed March 2026. https://www.summitpartners.com/resources/klaviyo-from-bootstrapped-beginnings-to-ipo↩
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Andrew Bialecki, LinkedIn post on Klaviyo IPO, September 20, 2023. https://www.linkedin.com/posts/bialecki_kvyo-klaviyo-activity-7110327349228773377-4FlA↩