Palantir Technologies Inc. ($PLTR) has been officially added to the NASDAQ 100 index ($QQQ), marking a significant milestone for the company. The inclusion occurred as part of a rebalancing of the index, which also saw the addition of MicroStrategy ($MSTR) and Axon Enterprise ($AXON). Palantir enters the index as the 19th largest weighting. On the same day, Palantir's stock reached a new all-time high, reflecting strong market performance with a 174% gain since the last near pullback to the 50-day simple moving average in September, and investor confidence.