Engineering News-Record has released its list of the Top 600 Specialty Contractors, including its top contract glaziers. A number of companies rounding out the top ten glazing and curtainwall firms saw revenue increases in 2012 compared to 2011.

Harmon Inc., once again ranked in the number-one slot, saw its revenue increase 20 percent to $180 million. Likewise, Enclos Corp. in the number-two slot saw its revenues up 10 percent to $176.4 million. Coming in at number 3, Walters & Wolf had revenues increase 38 percent to $140.3 million.

The list below provides a breakdown of the top ten glazing and curtainwall firms making the list.

Company$Mill/2012 Revenue   % Change ’11 – ’12
Walters & Wolf140.3+38
Tower Glass Inc.55+30
Karas & Karas48.7+125
National Enclosure Co. LLC45.1NA
Gamma Windows & Walls International Inc.  35.7NA
Haley Greer Inc.35NA
Alliance Glazing Technologies31.1NA

Earlier this year USGlass magazine also released its list of the industry’s top contract glaziers. A number of the same companies, including Harmon Inc., Enclos, Walters & Wolf, W&W and Gamma, were listed in the top ten on both lists.

According to the ENR report, the specialty contractor industry represents a significant part of the overall contract glazing industry. The report noted the top 600 saw combined revenues of $81.33 billion in 2012, up 12.7 percent from $72.14 billion in 2011.