In May 2012, Dart acquired Illinois-based Solo Cup Company and now has approximately 15,000 employees and more than 45 production, distribution center, and office locations in eight countries.

Dart Manufacturing Company was founded in 1937 by William F. Dart as a machine shop, manufacturing key rings, steel tape measures, and dog tags for the Department of Defense. When his son, William A. Dart, came out of the University of Michigan with three degrees (metallurgy, mathematics, and engineering), he worked for DuPont briefly, then joined the family business in the late 1950s. He experimented with and perfected an expandable polystyrene (EPS) molding process, and shipped their first insulated foam cups in April 1960. Dart Container Corporation was incorporated in 1960.

Dart Container Corporation is vertically integrated, which, according to the company, makes it "virtually self-sufficient". "We manufacture our own equipment, produce the raw material for our products, turn the raw materials into finished products and then deliver them throughout the world via trucks we own and operate. There are only a few things, like cartons, that we don’t produce in-house. We even have our own printing capabilities and make our own ink!"

In 2006, Family Business ranked Dart Container 37th in its listing of family companies, with an estimated $1.1 billion in sales, and 4,950 employees.

According to wikipedia