Exxon Mobil (XOM.US) plans to lay off nearly 400 employees from its Vanguard Resources

Exxon Mobil Corp. said it plans to cut 397 jobs, following its $63 billion acquisition of Pioneer Natural Resources Co. earlier this year, according to a notice filed Wednesday with the Texas Workforce Commission. The cuts will take place in seven phases through May 2026, and will affect nearly 20% of Pioneer's workforce before the merger, and will be concentrated in the Dallas suburb of Irving and Midland, Texas, offices, the company said.