The fastest growing technology companies in Connecticut have been named in the Marcum Tech Top 40, announced Thursday by the Connecticut Technology Council and Marcum LLP.

The best 40 companies have been named in six different technology categories: advanced manufacturing; energy, environmental, green technology; IT services; life sciences; new media, Internet, telecom; and software. A winner for each category, and one overall winner, will be chosen at a ceremony Oct. 2 at Oakdale Theater in Wallingford.

This is the 7th year of the Marcum Tech Top 40. In order to qualify as one of the top 40, the companies must have at least $3 million in annual revenue and a demonstrated record of growth in each of the past four years.

"The annual Marcum Tech Top 40 gives us the opportunity not only to see innovation first-hand but also to recognize how Connecticut's fastest growing technology companies are overcoming complex challenges to achieve success," Marcum New England partner-in-charge, Anthony P. Scillia, said in a statement. "Marcum is extremely proud to partner with the Connecticut Technology Council on this outstanding program again this year and enthusiastically congratulates all the winners."

Here is a list of the winners:

Advanced Manufacturing

APS Technology Inc – Wallingford

Bolt Technology Corporation – Norwalk

Dymax Corporation – Torrington

Revolution Lighting Technologies Inc. – Stamford

Rogers Corporation – Rogers

Energy/Environmental/Green Technology

FuelCell Energy, Inc – Danbury

Proton OnSite – Wallingford

IT Services

Cervalis LLC – Shelton

Datto Inc. – Norwalk

Gartner Inc. – Stamford

Information Services Group Inc. – Stamford

IT direct, LLC. – West Hartford