Investor uncertainty sunk Wall Street to its lowest level in three years on Wednesday as world cases of COVID-19 top 200,000 and are expected to keep rising. From the opening bell, the Dow Jones Industrial Average tumbled 1,300 points and maintained that fall for the rest of the trading session. The S&P 500 plunged lower during a massive morning sell-off, trigger the second market circuit breaker of the week, the first being on Monday. So far for March, the Dow is down 21.69% and the S&P 18.81%, making the month the worst the indices have seen since the financial crisis of 2008.

After market close, the New York Stock Exchange announced that its trading floor will move to a fully electronic trading system and temporarily close on March 23's market open. This move to close the trading floor came after pre-emptive tests for traders came back positive. The facilities to be close are the NYSE equities trading floor and the NYSE American Options trading floor in New York and NYSE Arca Options trading floor in San Francisco. For clarity, this is not a halt in trading but a push to move all trading online temporarily, where 80% of trading already takes place.

Here's how the market rested after Wednesday's trading session:

S&P 500 Index (SPY  ): -5.17% or -130.85 points to 2,398.34

Dow Jones Industrial Average (DIA  ): -6.28% or -1,333.34 points to 19,904.04

Nasdaq Composite Index (QQQ  ): -4.70% or -344.94 points to 6,989.84

In Major Stock News, only six stocks on the Dow Jones ended Wednesday in positive territory; Walgreens Boots Alliance (WBA  ), Cisco Systems (CSCO  ), Walmart (WMT  ), 3M (MMM  ), Pfizer (PFE  ) and Verizon (VZ  ). Wednesday's major sell-off did not spare any of the heavily impacted companies, with travel stocks--MGM Resorts (MGM  ), Marriott International (MAR  ), Carnival Corp. (CCL  ), Royal Caribbean (RCL  ), Norwegian Cruise Line (NCLH  ), American Airlines (AAL  ), United Air Lines (UAL  ) and Delta Air Lines (DAL  )--all sinking even lower as companies have begun asking the Trump administration for relief. Banks--JPMorgan (JPM  ), Citigroup (C  ), Bank of America (BAC  )--also suffered heavy losses as investor sell what they can. Shares of Boeing (BA  ) also steeply dropped, leading the aerospace company towards its worst month ever with March's losses being around 60%. One of the only gainers on Wednesday was Kroger (KR  ), as investors begin to load up on consumer staple companies that are more likely to weather the virus.

In Stock Sector News, Energy took a massive hit during Wednesday's trading session, ending the day down -14.28%. No sector survived the sell-off; the performance losses were as follows: Financials -8.85%, Real Estate -7.46%, Industrials -7.15%, Materials -6.16%, Consumer Discretionary -4.93%, Utilities -4.64%, Information Technology -4.59%, Health Care -3.40%, Consumer Staples -3.07% and Communication Services -2.81%.

Lastly, in Commodities and Currency News, crude oil barrel prices sunk to 18-year lows with worries that the market sell-off could get much worse before anything gets better. West Texas Intermediate (USO  ) dropped -16.52% and Brent Crude (BNO  ) fell -7.90% making barrel prices between $22-$27. Gold (GLD  ) sunk -3.31% to cost below $1,500 per ounce Wednesday as investors move towards cash as the current safe haven. Finally, the U.S. Dollar (UUP  ) continued to climb Wednesday, with the DXY Index increasing +1.40%.