Oppenheimer's 7,100 price target is the biggest on Wall Street, and suggests 11% upside from Friday's close.
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The head of U.S. equity and quantitative strategy's target implies just a 4% rise from current levels.
The S&P 500 is close to its all-time high, and BMO thinks there are more gains to be made above that February mark.
The firms' year-end S&P 500 outlooks now range from 6,450 to 7,000.
Strategist Venu Krishna lifted his year-end S&P 500 target to 7,650.
Despite recent pressure from tech stocks, the bull market should be poised to continue next year, according to UBS.
Oppenheimer sees shares of Nvidia rising a further 37%.
