Aug 6 Reuters Yellow Corp, a nearly 100yearold U.S. trucking firm, filed for Chapter 11 bankruptcy protection on Sunday, burdened with a heavy debt load after a series of mergers, and following tense contract negotiations with the Teamsters Union.

The bankruptcy filing in a Delaware court lists estimated assets and liabilities of 1 billion to 10 billion, with more than 100,000 creditors.

It is with profound disappointment that Yellow announces that it is closing after nearly 100 years in business, Yellow39;s CEO, Darren Hawkins, said in a statement on Sunday.

Yellow, formerly called YRC Worldwide, is one of the largest U.S. trucking companies and a dominant player in the lessthantruckload LTL segment that hauls cargo for multiple customers on a single truck.

Its customers include large retailers such as Walmart and Home Depot, manufacturers and Uber Freight.

Some, however, have paused shipments to the company on fears they could be lost or stranded if the carrier went bankrupt.

Yellow39;s bankruptcy filing comes after Teamsters said late last month that it was notified that the company was ceasing operations.

The company has been in contentious negotiations with the union over an internal restructuring initiative meant to boost efficiency. It recently averted a strike by 22,000 Teamstersrepresented workers.

Before resolving the strike threat, Yellow sued the union in Kansas federal court, seeking to block a strike and saying that union39;s refusal to negotiate…