Shares of Klaviyo, Inc. (KVYO) surged 12.38% in pre-market trading on Wednesday following the release of its impressive second-quarter 2025 financial results that significantly exceeded analyst expectations. The marketing automation company demonstrated robust growth and raised its full-year revenue guidance, boosting investor confidence in the stock's future performance.

Klaviyo reported adjusted earnings per share of $0.16 for Q2 2025, beating the analyst consensus estimate of $0.13 by 23%. The company's quarterly revenue reached $293.1 million, surpassing the analyst estimate of $278.7 million by 5.2% and marking a substantial 31.9% year-over-year growth. This strong performance was driven by Klaviyo's expanding customer base, which now serves over 176,000 clients globally.

In light of these positive results, Klaviyo raised its fiscal year 2025 revenue guidance to between $1.195 billion and $1.203 billion, up from the previous range of $1.171 billion to $1.179 billion. This new outlook projects a year-over-year growth of 27% to 28%. The company also provided an optimistic Q3 revenue guidance of $297 million to $301 million, exceeding analyst expectations. Klaviyo's Chief Financial Officer Amanda Whalen attributed this outstanding performance to "broad-based strength across customers and significant international growth," highlighting a 42% year-over-year revenue increase in the EMEA and APAC regions.