Fitbit, which is set to go public later this week, significantly increased the size of its proposed IPO. According to an updated filing with the Securities & Exchange Commission, the leading fitness tracking device maker now plans to offer 34.5 million shares at between $17 and $19 per share.

Previously, Fitbit planned to offer 29.85 million shares between $14 and $16 per share. At the top of its new price range, the company would have an
initial market cap of around $3.89 billion. The deal is expected to price Thursday night.

If FitBit went public at the high end of the range, its price-to-sales multiple would be greater than Apple Inc., Garmin Ltd. and Samsung Electronics Co., which all sell wearable technology. GoPro Inc., the most recent consumer-electronics company to go public, would still be more expensive than FitBit.

FitBit has been marketing its share sale to investors since June 2. During this so-called roadshow, investors submit non-binding requests for the IPO, and if there is enough demand, the bankers can raise the range. The company is expected to set a price for the initial public offering on Wednesday.

Fitbit has been hit by a pair of lawsuits in the past month from rival Jawbone, but the IPO terms increase suggests that the complaints aren’t dampening investor enthusiasm.

In 2014, Fitbit earned $132 million on sales of $745 million in revenue for 2014, compared to a $52 million net loss on $271 million in revenue for 2013. For the first quarter of 2015, the company reported $48 million in net income on $337 million in revenue, compared to $8.8 million in net income on $109 million in revenue for Q1 2014.

The company plans to trade on the NYSE under ticker symbol FIT. Morgan
Stanley, Deutsche Bank and BofA Merrill Lynch serving as lead
underwriters.

Fitbit has raised over $80 million in VC funding since its 2007 founding, from firms like Foundry Group (28.9% pre-IPO stake), True Ventures (22.4%) and SoftBank Capital (5.6%), Sapphire Ventures, Qualcomm Ventures and Felicis Ventures.