Klaviyo Q3 2026: Revenue Up 25% to $387.2M as Big Accounts Grow

Klaviyo reported third-quarter 2026 revenue of $387.2 million on 4 November, up 25% year over year, and raised its full-year revenue guidance to between $1.537 billion and $1.541 billion. The figure that stands out for email teams is not the top line but where the growth comes from: large accounts and customers who buy more than one product.

The number of customers paying Klaviyo more than $50,000 a year reached 4,725, up 33%. Accounts above $250,000 grew 49% to 390, and those above $500,000 grew 57% to 105. Across its base, Klaviyo now serves more than 211,000 brands, and 22% of its annual recurring revenue comes from customers using three or more of its products.

The quarter in numbers

Klaviyo's results announcement reports a gross margin of 74%, or 75% on a non-GAAP basis. Under US GAAP the company posted an operating loss of $4.5 million, an operating margin of minus 1%. On a non-GAAP basis it reported operating income of $56.9 million, a 15% margin. Free cash flow was $24.8 million, and $40.1 million on an adjusted basis.

Net revenue retention, which measures how much existing customers spend compared with a year earlier, stood at 108%.

CFO Erica Smith described the period as "another strong quarter with revenue up 25% year-over-year, and solid profitability." The company also said it had completed its previous $500 million buyback programme in October and approved a new $300 million authorisation.

Guidance for the end of 2026

For the fourth quarter, Klaviyo expects revenue of $421 million to $425 million, about 21% growth, and non-GAAP operating income of $66.5 million to $69.5 million. For the full year 2026 it now guides to revenue of $1.537 billion to $1.541 billion and non-GAAP operating income of $233 million to $236 million.

Where the growth comes from

Bigger accounts

The fastest growth sits in the top tiers. The $500,000-plus group grew 57%, the $250,000-plus group 49% and the $50,000-plus group 33%, all well above the 25% growth of total revenue. Klaviyo built its business on Shopify merchants of every size; these numbers show a platform that is winning a larger share of its revenue from enterprise and upper mid-market brands.

More than email

The 22% share of ARR from customers on three or more products reflects Klaviyo's push beyond email into SMS, customer service and analytics, sold on one customer data layer. The release headline also points to traction for its AI agents, and the company has been distributing its tools as apps embedded in Shopify and Wix.

Outside the United States

International revenue grew 32%, seven points faster than the group. For senders in Europe and elsewhere, that matters in practical ways: a vendor that earns a growing share of its revenue abroad has more reason to invest in local data residency, local payment options, language support and compliance with rules such as GDPR and the ePrivacy consent requirements for SMS and email.

Retention, not only new logos

A net revenue retention of 108% means that, on average, the customers Klaviyo had a year ago now spend 8% more. Part of that comes from list growth, since Klaviyo prices its email plans by the number of active profiles, and part from customers adding products. For a brand on Klaviyo, it is a reminder that the bill grows with the database unless inactive profiles are suppressed.

Klaviyo against the M&A backdrop

Within a week of the results, Salesforce agreed to acquire Braze for $5.66 billion. That deal takes one of the main independent customer engagement platforms into a suite. Klaviyo, with about $1.5 billion of annual revenue and positive non-GAAP margins, remains one of the largest independent platforms whose core product is still email marketing.

Action checklist

• Review your contract tier and renewal date: a vendor that grows fastest in large accounts tends to package features and support around those tiers.
• Price the bundle before you buy it: if you are offered SMS or another product, compare its cost with a standalone tool for your real volumes.
• Keep your data portable by exporting profiles, consent records and suppression lists on a schedule, whichever platform you use.
• Check your unsubscribe setup in every template while you review the account; our Klaviyo unsubscribe link guide covers the options.
• Watch the Q4 report for the holiday season results and the 2027 outlook.

Sources

1. Klaviyo: Klaviyo Delivers Solid Q3 with Enterprise Growth, Multi-Product Strength and Agent Traction, 4 November 2026 (primary source)
2. Klaviyo: third-quarter 2026 filing with the US SEC

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