SOUTH PORTLAND — One of Maine’s larger publicly traded companies is changing its ticker symbol on the New York Stock Exchange.

South Portland-based WEX Inc. is changing its symbol to “WEX” from “WXS.” The change is effective at the start of trading on April 15.

The company’s main line of business is processing fuel payments for commercial and government fleets. Last fall it changed its name from Wright Express Corp. to WEX.

The company last year reported revenues of $623 million.