2023 was a great year to have money working for you in the U.S. stock market. The S&P 500 index rose about 25%, and some of its components did a whole lot better.

Seasoned investors like owning shares of well-established pharmaceutical companies like Eli Lilly (NYSE: LLY) because patent-protected exclusivity for their products makes them reliably profitable. They aren't, however, generally known for putting up huge gains like Eli Lilly did last year.

The big pharma company helped lift the benchmark S&P 500 index higher with an eye-popping gain of about 59% in 2023, and investors want to know if the company has more fuel in the tank to keep the ascent going.

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Source Fool.com