Exxon Mobil plans to lay off almost 400 employees as a result of its recent acquisition of Pioneer Natural Resources, the company said in a filing with the Texas Workforce Commission.

More than 90% of layoffs are at Pioneer’s former headquarters in Irving, Texas with the rest being workers in Midland. The separations will start in fourth-quarter 2024 and continue through 2026.

Exxon said it offered jobs to more than 1,900 Pioneer employees as part of the merger and “well over a majority” accepted. The company employs 62,000 people worldwide.

“Our employment strategy has not changed,” Exxon said in the filing. “The success of this merger depends heavily on the retention of Pioneer’s talented workforce.”

The $59.5 billion deal was announced in October 2023 and completed in May 2024. Exxon controls more than 1.4 million acres in the Permian Basin with an estimated 16 Bboe resource, the company said in May.