Klaviyo reported a significant increase in cash from operating activities, rising from $166.0 million in 2024 to $218.0 million in 2025. The company also increased its operating cash flow to $54.8 million in Q3 FY25 from $38.8 million in Q3 FY24, with free cash flow improving to $47.1 million from $34.2 million. Klaviyo's customer base grew to over 193,000 paying customers by the end of fiscal year 2025, up from over 167,000 a year earlier. The number of large customers, defined as those generating over $50,000 in annual recurring revenue, increased to 3,563, reflecting a 36% year-over-year growth. Klaviyo's revenue for fiscal year 2025 increased to $1.234 billion from $937.464 million in 2024, representing a 32% year-over-year growth. The company reported Q3 FY25 revenue of $310.9 million, up 32% year over year, and raised its full-year FY25 revenue guidance to $1.215–$1.219 billion, indicating a 30% year-over-year growth. Additionally, Klaviyo's non-GAAP diluted EPS rose to $0.18 in Q3 FY25 from $0.15 in Q3 FY24, and the GAAP net loss was reduced from $46.1 million in 2024 to $31.8 million in 2025. Klaviyo also achieved 42% year-over-year revenue growth outside the Americas, supported by new regional hubs in Dublin and Singapore. During the Black Friday weekend, customers generated $3.8 billion in sales through Klaviyo's platform, marking a 27% year-over-year increase.