Klaviyo Inc. reported fiscal second-quarter results that comfortably exceeded Wall Street expectations and lifted its full-year outlook, sending the marketing-software provider’s shares up as much as 17% in late trading on Tuesday. Revenue for the quarter ended 30 June rose 32% from a year earlier to $293.1 million, surpassing analyst estimates of roughly $266 million to $279 million. Adjusted earnings came in at $0.16 a share, compared with the $0.13 consensus. Adjusted operating income was $40.9 million, representing a 14% margin, while gross profit increased 29% to $221.9 million, giving a 76% gross margin. Customer growth continued, with total accounts climbing 17% to more than 176,000 and the number of clients generating at least $50,000 in annual recurring revenue jumping 38% to 3,291. For the current quarter, Boston-based Klaviyo projected revenue of $297 million to $301 million, implying about 26% year-over-year growth. Management also raised its full-year revenue forecast to a range of $1.195 billion to $1.203 billion, up from previous guidance of roughly $1.17 billion.