DDOG — S&P 500 index addition

Datadog (DDOG) entered the S&P 500 at the close on Jul 9, 2025, replacing Juniper Networks. 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 Nasdaq-100 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 25 S&P 500 entries with a recorded announcement and prices for that interval was +16.9%; this stock was 17.9 percentage points above that median. Measured from the effective close, DDOG returned 1W: -3.2% versus +0.3% for the 28-entry index median; 1M: -6.5% versus +2.2% for the 28-entry index median; 3M: +6.5% versus +5.2% for the 28-entry index median; 1Y: +22.6% versus +11.6% for the 24-entry index median. These figures do not measure movement from the announcement price.

At 1M, it ranks 22nd of 28 measured S&P 500 additions and lagged the benchmark by 8.6 percentage points. At 3M, it ranks 13th of 28 measured S&P 500 additions and lagged the benchmark by 1.4 percentage points. At 1Y, it ranks 7th of 24 measured S&P 500 additions and beat the benchmark by 4.6 percentage points. The other 7 Information Technology additions with a measured 1M return averaged -2.4%. This is historical context, not a projection.