Wireless internet firm Cambium Networks goes public, but Chicago-area company’s debut fails to dazzle

Cambium Networks, a Rolling Meadows-based provider of wireless internet technology, went public on Wednesday, but its shares started and ended the trading day below the $12 price of the initial public offering.Shares of the company, trading on Nasdaq Global Market under the symbol “CMBM,” opened Wednesday at $10.08 a share and closed at $9.70.In early June, when the company filed its IPO paperwork with the SEC, Cambium it said it planned to sell 5.8 million shares at an estimated price of $13 to $15 a share, and use the estimated net proceeds of $72.4 million to pay down debt, for general corporate purposes and expansion opportunities.