Net profits in the third quarter came in at Tw$3.9 billion ($133.1 million), down sharply from Tw$18.64 billion a year ago, the company said, without providing details.
Revenues totalled Tw$70.2 billion, meeting the lower side of the Tw$70 billion-Tw$80 billion range it had previously forecast. The revenues marked a sharp decline of 48 percent from a year ago when they were Tw$135.82 billion.
HTC sells its own smartphones and also makes handsets for a number of leading US companies, including Google's Nexus One.
The company has recently unveiled a new series of smartphones to compete with US technology giant Apple and South Korea's Samsung, which separately launched the iPhone 5 last month and the Galaxy Note II in late September.
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