Fitness-tracking device maker Fitbit has priced its US initial public offering at $US20 ($A25.81) per share, slightly more than anticipated.
The pricing marks the final step before Fitbit's stock begins trading on the New York Stock Exchange on Thursday, under the ticker symbol "FIT".
The San Francisco company will debut with a market value of about $US4 billion ($A5.16 billion).
Fitbit makes devices that can be worn on the wrist or clipped to clothing to monitor daily steps, calories burned, and grab other data.
The company said it sold 10.9 million devices last year to nearly triple its annual revenue to $US745 million ($A961.29 million).
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It posted a profit of $US38.5 million ($A49.68 million).
Earlier this week, the company said it expected the IPO to price at up to $19 per share.
Market research company CCS Insight says it thinks 24 million fitness trackers will be sold in the US this year, and it expects that number to double in 2018.
Popular activity trackers include Fitbit, Jawbone, Nike, Xaomi and Garmin, and the Apple Watch also includes some related features.
Even Swarovski has gotten in on the act, making jewel-encrusted bands for a company called Misfit.
