U.S. Silica Holdings, Inc. announced that on August 10, 2023, Jay Moreau was appointed to serve, effective August 14, 2023, as Executive Vice President and Chief Operating Officer of the company. Mr. Winkler has resigned as Executive Vice President and Chief Operating Officer of the Company, effective as of August 14, 2023. To ensure an orderly transition, Mr. Winkler will continue with the Company in a strategic advisory role through September 2023, then shift to a consulting role.

Mr. Moreau, age 57, served as Chief Executive Officer of the U.S. Aggregates and Construction Materials operations of Holcim US, a global leader in innovative and sustainable building solutions, from February 2019 to January 2023. Prior to his role at Holcim, Mr. Moreau served with Martin Marietta Materials, a supplier of building materials, for 22 years, where he held positions of increasing responsibility, most recently as Senior Vice President of Operations Services, which position he held from 2011 to February 2019. Mr. Moreau holds a Bachelor of Science degree from Juniata College in Huntingdon, Pennsylvania.