DDOG — Nasdaq-100 index addition

Datadog (DDOG) entered the Nasdaq-100 at the close on Jul 9, 2025, replacing Old Dominion Freight Line. The recorded announcement came 7 calendar days before the effective close, on Jul 2, 2025. The company is classified in Information Technology in this dataset. The same ticker also appears in the tracked S&P 500 addition register. That record alone does not establish a transfer between indexes.

In the 30 calendar days leading into the effective close, DDOG moved +34.8%. The median 30-day run-up among the 14 Nasdaq-100 entries with a recorded announcement and prices for that interval was +12.2%; this stock was 22.6 percentage points above that median. Measured from the effective close, DDOG returned 1W: -3.2% versus -2.2% for the 14-entry index median; 1M: -6.5% versus +0.8% for the 14-entry index median; 3M: +6.5% versus +5.6% for the 13-entry index median; 1Y: +22.6% versus +4.4% for the 9-entry index median. These figures do not measure movement from the announcement price.

At 1M, it ranks 11th of 14 measured Nasdaq-100 additions and lagged the benchmark by 8.9 percentage points. At 3M, it ranks 6th of 13 measured Nasdaq-100 additions and lagged the benchmark by 2.7 percentage points. At 1Y, it ranks 3rd of 9 measured Nasdaq-100 additions and lagged the benchmark by 0.4 percentage points. The other 8 Information Technology additions with a measured 1M return averaged -5.2%. This is historical context, not a projection.