The S&P 500 has been in a “bull market” for 3,453 days as of the close of markets Wednesday. The index has risen more than 320 percent since March 2009, according to S&P Dow Jones Indices.
A bull market is defined as a stretch during which the stock market rises without being interrupted by a drop of 20 percent or more.
There is some debate about whether the current run qualifies as the longest bull market in history. Some Wall Street watchers say a bull market is “confirmed” by a record closing high, The Wall Street Journal reports. Wednesday’s close was not a record.
Others challenge the idea that the previous record run lasted only 3,452 days, The New York Times reports. That stretch, which started in October 1990 and ended in early 2000, was preceded by a market decline of 19.92 percent. People who don’t round that figure to 20 say that particular bull market actually extended back to 1987.