PE-backed CommScope raised about $577 million in its IPO on Friday after pricing its offering at $15 per share. The company now trades on the NASDAQ under the symbol COMM. Bought out by The Carlyle Group for $3.9 billion in 2011, CommScope provides connectivity and infrastructure solutions for wireless, business enterprise and residential broadband networks. The $15 price point was well below its expected offering range of $18 to $21 per share. COMM shares ended their debut down a penny at $14.99.