Here’s a history of stock market performance in the 10 days following elections

Published Mon, Nov 2 202012:25 PM ESTUpdated Fri, Nov 6 20207:06 AM EST

(This story is for CNBC Pro subscribers only.) On the eve of Election Day, many investors are gearing up to adjust their investments in anticipation of the market-moving event. Here's how stocks tend to perform following the final outcome. For the past 19 presidential election years since 1944, the S & P 500 has gained an average 1.7% in the 10-day period after Election Day, according to Sam Stovall, chief investment strategist at CFRA Research. Chances of an up market in the 10 days following the big result have been just about a coin toss, or 47% of the time, CRFA data showed. In the 2016 election, the S & P 500 fell nearly 2% in the 10-day period following Donald Trump's upset victory, according to CRFA data. The market then went on to bigger gains after that short period. Democratic nominee Joe Biden holds a substantial national lead over President Donald Trump ahead of Tuesday's election. The former vice president has amassed 52% of support from registered voters versus 42% for the president, according to a NBC News/Wall Street Journal poll from Sunday. However, Trump appears to have momentum in some battleground states. Investors will also focus on who wins majority control of the Senate, which could determine the fate of much-needed fiscal stimulus. Many believe a "blue wave" that sweeps Democrats into the majority of both the Senate and the House would result in a faster and bigger deal. "A Democratic sweep outcome in the election would tip us to a more pro-risk stance overall, strengthening our conviction that a cyclical upswing will benefit risk assets over a 6-12 month horizon," BlackRock strategists said in a note Monday. The Dow Jones Industrial Average just suffered its worst monthly performance since March as fears of a worsening coronavirus pandemic and a slowing global economy dented sentiment. The S & P 500 is coming off two straight negative months, sitting about 7% off its record high from Sept.2. — CNBC's Michael Bloom contributed reporting.

Democratic presidential candidate former Vice President Joe Biden and U.S. President Donald Trump answers questions during the second and final presidential debate at the Curb Event Center at Belmont University in Nashville, Tennessee, October 22, 2020.

Morry Gash | Pool | Reuters

(This story is for CNBC Pro subscribers only.)

On the eve of Election Day, many investors are gearing up to adjust their investments in anticipation of the market-moving event. Here's how stocks tend to perform following the final outcome.