Five more trucking and logistics companies have announced weaker results, capping a first-quarter earnings season when the slow freight market led more than two-thirds of publicly traded companies to produce lower results year-over-year.

XPO Logistics slightly reduced its first-quarter loss, excluding one-time costs, to $9.8 million, or 8 cents per share, while earnings slipped 9% to $96.6 million, or 53 cents, as airfreight and ocean forwarding results weakened.

Quarterly earnings reports last week were divided between four logistics operators that reported improved operating results and four truckload fleets whose profits fell due to pressure on rates and minimal freight shipment growth.

Earnings performance generally was weaker at the five companies that announced earnings on April 27 in a freight market described by one of the reporting companies as “difficult.”

Intermodal Bridge Transport, a nationwide port trucking company, is facing a formal National Labor Relations Board action that could become a precedent-setting case involving claims the company misclassified its Southern California drivers as independent contractors.

Truck tonnage rose 2.2% in March on a year-over-year basis, reflecting slow economic growth and mixed freight trends, American Trucking Associations reported.

The initial round of first-quarter truckload earnings sounded a negative note, with three of four large carriers reporting weaker results in a tough freight environment.