Klaviyo's AI Agent Momentum Meets A Margin Test As Stock Nears Its Post-Earnings High

Klaviyo heads into its third-quarter report with a split personality. The top line has been doing almost everything bulls could ask for, with revenue beats, three straight full-year guidance raises and early traction for its new AI agents. Underneath, gross margin is sliding, operating income guidance was trimmed and net revenue retention has started to soften. The stock has rallied hard since the last report anyway, so Wednesday's results after the close need to show that growth is still outrunning those cost pressures.

Wall Street expects non-GAAP earnings of $0.18 per share on revenue of $379.7 million, up about 22% from $310.9 million a year ago. The Earnings Whisper sits a bit higher at $0.20, which suggests the more aggressive crowd expects Klaviyo to clear the profit bar with some room to spare. The revenue estimate is just above the $379 million midpoint of management's $377 million to $381 million guidance. That is a sensible place for the Street to be given Klaviyo's habit of beating its own forecasts, but it leaves little cushion if the company lands merely in range. The bigger optical issue is deceleration. Second-quarter revenue grew 26%, and the guidance implies roughly 21.5% to 22.5% this time. A print near the top of the range or better would argue that the slowdown is mostly about tougher comparisons rather than fading demand.

The full-year outlook carries the most weight. Management lifted 2026 revenue guidance to $1.526 billion to $1.534 billion, adding $12 million and raising by more than the size of the second-quarter beat. That followed an earlier increase, so the Street now treats raises as routine. A fourth consecutive bump would validate the story that enterprise wins and international expansion are compounding. International revenue climbed 35% last quarter, and customers paying more than $50,000 a year grew 36%. A flat outlook would not be a disaster, but it would break a pattern investors have priced in.

Margins are where the narrative is most exposed. Non-GAAP gross margin fell to 73.4% last quarter, down three points from a year earlier, because text messaging and carrier fees are taking a growing share of the mix. Management warned of further slippage in the third quarter and a larger-than-usual seasonal dip in the fourth. Separately, it cut full-year operating income guidance by $10 million to $212 million to $218 million to absorb costs from the Agency acquisition and added product spending. The mobile pricing update rolled out this quarter, which passes carrier fees through to customers, is the piece to monitor. Management called it neutral for 2026, so early signs that it is stabilizing margins without hurting adoption would ease a key bear concern. Retention matters too. Net revenue retention slipped to 109%, and management expects profile-enforcement effects to weigh on it into early 2027, so holding near that level would count as a win.

The AI agents are the newest catalyst. Composer drew more than 95,000 users in its first month after its June launch, and Customer Agent resolution volume jumped 80%. This report should show whether that early curiosity is turning into sustained usage and paid upsell. It is also the first report under new CFO Erica Smith, so any change in how guidance is framed will draw scrutiny.

Sentiment has turned sharply more cautious, at 61.1% bearish versus 17.2% bearish a quarter ago, even as the stock gained nearly 28% against a flat S&P 500. At $20.71, shares sit well above the 200-day average and within about 2% of the $21.17 post-earnings high, effectively testing a breakout. That leaves a demanding setup. Klaviyo likely needs another revenue raise paired with evidence that gross margin is bottoming. Growth alone may not be enough if the cost of producing it keeps rising.

This earnings preview was originally published on Earnings Whispers.

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