Shares of Ruckus Wireless fell in their first hours of trading after raising $126 million in an initial public offering of stock.

The Sunnyvale, Calif., company makes equipment for and builds big Wi-Fi networks. Its biggest customers are phone companies, which want Wi-Fi hotspots that can offload traffic from their cellular networks.

The company and its early investors sold 8.4 million shares for $15 each, the high end of the expected range. That’s usually a sign of high demand for the stock.

But shares are down Friday morning. Trading on the New York Stock Exchange under the symbol “RKUS,” the stock was off 89 cents, or 5.9 percent, to $14.11.