The S&P 500 is just 10 points away from reclaiming the 1500 mark, a level it first hit nearly 13 years ago in March of 2000. The overall index may be flat since then, but that's not to say that there hasn't been plenty of change beneath the surface.
Nearly half of the companies in the index have changed since 2000--only 269 of the same companies remain. The market cap of four of those companies have appreciated by more than 1000%, while the same number have lost more than 80% of their value.
The vast majority of market caps have moved significantly more or less than the index. In fact, there are only eight companies that are +/-3% from where they were in 2000 and 22 are +/-10%. Below is a list of companies that have remained in the S&P 500 since 2000 with the smallest change in market cap.
NOTE: original post compared share prices, but the database I was pulling from had some trouble dealing with splits so there were some problems with the analysis.