ACV Auctions (ACVA) reported a Q2 loss late Monday of $0.05 per diluted share, widening from the loss of $0.04 a year earlier.
Analysts polled by FactSet expected a loss of $0.07.
Revenue in the three months ended June 30 rose to $213.9 million from $193.7 million a year earlier.
Analysts projected $214.9 million.
The company expects Q3 revenue of $219 million to $225 million. Analysts project $223.8 million.
ACV reaffirmed full-year revenue guidance of $845 million to $855 million. Analysts project $851.1 million.
The company's shares fell 13% in after-hours trading.