The S&P 500 now trades at 19 times its expected 12-months earnings, well above its historic average of 15.6 times, Refinitiv Datastream showed.
WFII recently downgraded the technology sector, which has led this year's S&P 500 rally, to "neutral" from "favorable," citing "unattractive" valuations.
Goldman urged investors to consider "downside protection" to their stock portfolios, though they expect the S&P 500 to reach 4,500 by year-end, or about 3.5% above current levels.
Valuations are even more stretched for the Nasdaq 100 (.NDX), whose 36% rally this year has dwarfed that of the S&P 500.
"From a near-term perspective, investors should expect stocks to just cool a little bit."
Persons:
Refinitiv Datastream, Goldman Sachs, Sameer Samana, WFII, Goldman, Refinitiv, Michael Purves, Purves, Anthony Saglimbene, Lewis Krauskopf, Ira Iosebashvili, Richard Chang
Organizations:
YORK, Wells, Wells Fargo Investment Institute, Federal Reserve, Nasdaq, Tallbacken Capital, Deutsche Bank, Ameriprise, Thomson
Locations:
Wells Fargo