TriNet Group Inc. (NYSE: TNET), one of the largest professional employer organizations, commenced trading on the New York Stock Exchange last Thursday, with the initial public offering of 15,000,000 shares of common stock priced to the public at $16.00 per share. Today, shares were at $21.03 in early afternoon trading, and TriNet had a market cap of $1.43 billion, according to Yahoo!

 “TriNet is a real company with real profits and a legitimate evaluation based on earnings and not sales,” said CNBC Mad Money’s Jim Cramer in an interview with TriNet’s CEO.

The San Leandro, Calif.-based professional employer organization ranks No. 4 on Staffing Industry Analysts’ list of largest PEOs based on 2012 revenue, and it grew larger last year by acquiring Ambrose Employer Group, the fifth-largest PEO, in July. TriNet reported revenue of $1.02 billion in 2012 and net income of $31.8 million.