TransFirst, a portfolio company of Welsh, Carson, Anderson & Stowe, has filed to go public and raise up to $100 million. Rumors are the company, which provides transaction processing services and payment enabling technologies, could fetch at least twice that amount when terms are finalized. TransFirst served more than 200,000 merchants in 2013, processing over $48 billion in transaction volume. In the 12-month period ending March 31, revenue was $1.1 billion, adjusted EBITDA was $117.1 million and net income was $18 million. WCAS acquired the company in 2007 from GTCR for $683 million, and will retain controlling interest after the offering. Ropes & Gray represented TransFirst in the filing.