Montrose Environmental Group (NYSE: MEG, changing to ONT May 4, 2026) will mark Earth Day by rebranding to Onterris. The new, unified brand reflects a purpose and broader role in tackling complex environmental challenges with scientific rigor, operational quality and precise execution. It also aligns expertise and market awareness to position the Company for its next phase of growth. Founded 14 years ago and operating across the U.S., Canada and Australia, the Company is a leading pure-play environmental solutions provider. While the name is new, the mission remains unchanged: advancing our way of life without compromising the integrity of our environment.