On Wednesday, the current bull market became the longest in U.S. history.
Since March 9, 2009, the S&P 500 alone has risen more than 300%.
But if you look deeper into the numbers behind the S&P's growth, you find that one industry has outpaced all others.
The S&P 500's healthcare stock sector, which is comprised of the largest health insurers, is up more than 1,100% since 2009.
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