Quantum Computing reported a Q3 loss late Monday of $0.07 per diluted share, swinging from earnings of $0.01 a year earlier.
Analysts polled by FactSet expected a loss of $0.04.
Revenue for the quarter ended Sept. 30 was $9.5 million, compared with $384,000 a year earlier.
Analysts expected $7.6 million.
Quantum Computing shares dropped 3.8% in extended trading.