PRIMECAP Management's position in Amentum Holdings is currently worth $276M. That's 0.17% of their equity portfolio (100th largest holding). The investor owns 4.86% of the outstanding Amentum Holdings stock. The first Amentum Holdings trade was made in Q3 2024. Since then PRIMECAP Management bought shares four more times and sold shares on two occasions. The stake costed the investor $273M, netting the investor a gain of 0.8% so far.