Shares of Xoom soared more than 40 percent in their first day as a publicly traded company.

The online money-transfer company gained $6.41, or 40.1 percent, to $22.41 in midday trading on Friday. It opened at $21.

Xoom Corp. raised $101.2 million from selling 6.3 million shares at $16 each. It had predicted selling 5.8 million shares for $13 to $15 each in a Securities and Exchange Commission filing earlier this month. That Xoom sold more stock, for a higher price, suggests healthy demand from investors.

The banks managing the deal may buy nearly 950,000 additional shares to sell if there's demand, increasing Xoom's proceeds from the initial public offering.

Xoom, an upstart Internet competitor to Western Union Co., sold 5.2 million shares in the IPO, while early investors offered 1.1 million. The company won't receive proceeds from shares sold by the early investors. It predicted proceeds of $74.7 million after expenses, which it expects to use to run the business and possible acquisitions.

Xoom says many of its customers are immigrants to the United States that use Xoom's website to send money back to people in their home countries. They transferred $3.2 billion last year, up from $1.7 billion in 2011.

Shares of the San Francisco company are trading on the Nasdaq under the "XOOM" symbol.