AMTM — S&P 500 index addition

Amentum Holdings (AMTM) entered the S&P 500 at the close on Nov 15, 2024. The recorded announcement came 7 calendar days before the effective close, on Nov 8, 2024. The company is classified in Industrials in this dataset.

A comparable 30-day run-up is not reported here because the announcement date or the required price history was not recorded. Measured from the effective close, AMTM returned 1W: -4.2% versus +0.3% for the 28-entry index median; 1M: -8.3% versus +2.2% for the 28-entry index median; 3M: -12.5% versus +5.2% for the 28-entry index median; 1Y: -8.3% versus +11.6% for the 24-entry index median. These figures do not measure movement from the announcement price.

At 1M, it ranks 25th of 28 measured S&P 500 additions and lagged the benchmark by 10.1 percentage points. At 3M, it ranks 24th of 28 measured S&P 500 additions and lagged the benchmark by 14.7 percentage points. At 1Y, it ranks 16th of 24 measured S&P 500 additions and lagged the benchmark by 25.3 percentage points. The other 3 Industrials additions with a measured 1M return averaged +13.9%. This is historical context, not a projection.