The S&P has just logged its longest losing streak since 1980

The S&P 500 closed lower Friday for the ninth straight session — the first time it has experienced that many losses in a row in nearly 36 years.

Uncertainty about the election has been pegged as the biggest stumbling block for the market. Lately, the perceived chances of Donald Trump winning have risen; many strategist have said that such an outcome would take a big chunk out of the S&P, with a 10 percent drop serving as a sort of base case.

Stocks have been getting no help from oil, either. Supply concerns have driven crude lower in six straight sessions.

On top of all this, it looks increasingly likely that the Federal Reserve will raise rates in December, which could serve as another stumbling block.

The market last fell in nine straight sessions in the beginning of December 1980. Interestingly, that streak was snapped on Dec. 12 — the day of Apple's initial public offering. Today, that is the biggest stock in the world.

While the market dropped more than 9 percent during that time period, the current declines have been much more mild. The S&P last closed higher on Oct. 24. Since then, the index has fallen by only slightly more than 3 percent. That is less than the market has fallen in about 300 single sessions, going back to 1928.

Given that the S&P has risen in 52 percent of its sessions, the odds of seeing the market fall for nine sessions straight is a mere 0.14 percent.


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Sara Eisen

Sara Eisen joined CNBC in December 2013 as a correspondent, focusing on the global consumer. She is co-anchor of the 10AM ET hour of CNBC's "Squawk on the Street" (M-F, 9AM-11AM ET), broadcast from Post 9 at the New York Stock Exchange.

In March 2018, Eisen was named co-anchor of CNBC's "Power Lunch" (M-F, 1PM-3PM ET), which broadcasts from CNBC Global Headquarters in Englewood Cliffs, N.J.

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