Palantir Technologies leads the list of a half dozen companies that could be added to the $26 trillion Nasdaq 100 index at its annual reconstitution due to be announced on Dec. 13Stock Other candidates for inclusion at the reconstitution,

Palantir Technologies ( PLTR 0.47%) has been one of the top-performing stocks this year. The company's strong results led to the stock's inclusion on the S&P 500, and now it has moved to the Nasdaq stock exchange, where it could soon join the even more exclusive Nasdaq 100 index.

Investors should expect that some selling pressure will come in the form of short-term profit-taking before year-end. However, any weakness in Palantir will certainly be met with additional buyers as long-term investors are likely to be waiting for an opportunity to buy Palantir stock on a dip.