Fensterbau/Frontale

The majority of the information included in the Top 50 comes directly from contract glazing firms; this year, 43 of the Top 50 confirmed their 2009 and 2010 sales figures. However, some companies request that we not include them or refuse to provide any information. We understand the sensitivity of releasing sales figures; however, we do not omit any firms simply because they ask. In cases where a company declines to participate, we use independent sources Dun & Bradstreet and Hoovers, prior-year submissions, and estimations from industry members to determine their ranking. Companies marked with ** are those that declined to provide information for the Top 50 Glaziers survey, but that Glass Magazine editors believe should be included. Their estimated rank is based on the independent sources described above.