AECOM Technology Corp. said it has filed the necessary paperwork with the Securities and Exchange Commission for an initial public offering.

AECOM, based in Los Angeles, is one of the world’s largest design and engineering firms and had revenues of more than $3.3 billion last year.

The shares will be sold by AECOM and certain stockholders of the company. No specifics relating to the number of shares or the price per share for the offering were available.

Morgan Stanley, Merrill Lynch, and UBS Investment Bank will act as lead underwriters for the offering.