An initial public offering of Gain Capital Holdings Inc. stock raised a total of $81 million in gross proceeds at a price that came in lower than the company expected.

The Bedminster, N.J., company, which is an online foreign exchange trading platform for retail customers, said Wednesday it priced an IPO of 9 million shares at $9 per share. The stock will start trading Wednesday under the ticker symbol "GCAP."

Gain Capital offered 407,692 shares and selling stockholders offered about 8.6 million. The company said it won't receive proceeds from the sale of shares by selling stockholders. Underwriters also have an option to buy more than 1.3 million additional shares to cover excess demand.

The company had said it expected to sell about 11 million shares at a price between $13 and $15. It plans to use the net proceeds to pay the expenses related to the IPO.

Gain Capital was founded in 1999 by a group of trading and technology professionals. It offers global over-the-counter foreign exchange trading where participants trade with one another rather than through a central exchange or clearinghouse. It offers access to global gold and silver markets, stock indices, and commodities.