Appen (ASX:APX) reported a revenue of $55.3 million in the quarter ended Sept. 30, up 2% compared with the revenue reported in the prior corresponding period, according to a Thursday Australian bourse filing.

Its underlying earnings before interest, taxes, depreciation, and amortization, excluding restructuring costs, transaction costs, as well as acquisition-related and one-time share-based payment expense, came in at $1 million, in line with the year-ago period.

It said that its growth in China, where its quarterly revenue jumped 81% year-over-year, was offset by the "ongoing volatility and dynamic nature" of the US AI market.

It reaffirmed its full-year guidance and said that its revenue was tracking towards the low end of $235 million to $260 million range.