The top four firms in Architectural Record’s yearly ranking held tight to their places from 2016. AECOM, Perkins+Will, and Jacobs followed San Francisco–based Gensler, which clinched the No. 1 spot for the sixth year in a row, seeing more than $1.19 billion in revenue—an increase of more than $100 million since 2015.

The annual list, compiled by RECORD’s sister publication Engineering News-Record, ranks companies by their architectural revenue from the prior year, as reported to ENR by firms that choose to participate. Gensler co-CEOs Andy Cohen and Diane Hoskins noted the growing importance of virtual, augmented, and mixed-reality platforms, which they say “are having a real impact on the design process, helping our designers innovate for our clients, and our clients more effectively visualize and experience their designs in real time.”

AECOM maintained second place, though the firm’s architectural revenue has decreased slightly in recent years, from a five-year high of $801 million in 2014 to $605 million in 2015, and just under $596 million last year.

Despite remaining in third place, Perkins+ Will saw an increase in revenue of almost $80 million. “We are trying to be as agile as possible,” says CEO Phil Harrison, “including establishing methods of predicting our future business workflow.”

Corgan experienced the largest jump of the Top 25 firms on this year’s list, moving from 22nd place in 2016 to 14th. “We understand taking care of our clients,” said Steve Hulsey, executive managing principal and education sector leader. “Responding to their unique needs and implementing their vision on time and on budget is job one, and we do that every day.”

Click here to view the entire Top 300 firms list, with their 2016 revenue listed in millions.