The S 500, which tracks the stock market performance of the 500 largest U.S. companies, hit a new all-time high this week. This marks the 21st time this year the benchmark has ascended to new heights (as of this writing).

While some investors might find this concerning, XM Investment analyst Marios Hadjikyriacos remains bullish: "Stock markets are enjoying the best of all worlds, buoyed by a resilient U.S. economy and speculation that Fed rate cuts are just around the corner, helping to justify stretched valuations." UBS analyst Mark Haefele concurs, positing in a note to investors, "All-time highs often generate investor concern that markets have peaked. Such worries are not supported by history."

In fact, according to select Wall Street analysts, a number of high-profile stocks in the S 500 still have a great deal of upside potential and could soar as much as 91%.

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Source Fool.com