AMTM ▲ +1.7% - Amentum Holdings, Inc. $AMTM Amentum Selected for Projects to Upgrade and Protect the UK Energy Grid Amentum Holdings gained 1.7% today after being selected for projects to upgrade and protect the UK energy grid, a contract award that expands the company's infrastructure work in a key market. 01-SEP-2026 08:30 AM ET