Here is the 2014 Transport Topics Top 100 list of for-hire carriers. Companies are ranked by 2013 revenue unless otherwise footnoted.

The shortage of drivers is limiting the ability of many trucking companies to expand freight-hauling capacity and is a major factor behind an increase in the number of mergers and acquisitions, according to executives interviewed for the 2014 Transport Topics Top 100 list of U.S and Canadian for-hire carriers.

In general, 2012 yielded higher revenue and slightly better profits for motor carriers than the prior year, but not enough in many cases to fully compensate for the extra work required to get there.