Big market drop | Latest on coronavirus | Trillion-dollar club

Stocks plummeted on mounting fears about the coronavirus.

VIEW IN BROWSER | SUBSCRIBE FRI, JAN 31, 2020 EVENING BRIEF AS OF FRI, JAN 31, 2020 • 04:30 ET DJIA 28256.03 -2.09% -603.41 S&P 500 3225.52 -1.77% -58.14 NASDAQ 9150.94 -1.59% -148.00   Most Active DOW NAME LAST CHG %CHG AAPL 309.51 -14.36 -4.43% MSFT 170.23 -2.55 -1.48% XOM 62.12 -2.67 -4.12% S&P 500 NAME LAST CHG %CHG GE 12.45 -0.28 -2.20% F 8.82 -0.02 -0.23% AMD 47.00 -1.78 -3.65% NASDAQ NAME LAST CHG %CHG AMD 47.00 -1.78 -3.65% AAPL 309.51 -14.36 -4.43% MSFT 170.23 -2.55 -1.48% EDITOR'S NOTE While the broad market suffered a brutal sell-off on coronavirus fears, Amazon swiftly rejoined the coveted trillion-dollar club after knockout quarterly earnings.   The only four companies with more than $1 trillion market capitalization — Apple, Amazon, Microsoft and Google-parent Alphabet — have actually traveled similar paths on their journey to the pinnacle, CNBC's Michael Sheetz writes. These tech giants all looked to services and cloud businesses for growth in the past couple of years. In turn, the market has rewarded the companies richly, as each of their market values have climbed to record levels.     Friday's sell-off also spoiled an old market indicator "January barometer" that was signaling a positive year. The indicator suggests a correlation between January's performance and full-year returns, AKA the saying "as goes January, so goes the year."   The losses cut the January returns for the S&P 500 to just about flat. Perhaps the indicator now is signaling a volatile year we may have ahead.   The biggest risk to the market right now seems to be the worsening coronavirus, which forced major U.S. airlines to halt service to China altogether.   "Uncertainty is never great for stocks, but when it involves the lives of many, many people, it's impossible to know just what kind of problems this uncertainty will eventually create," said Matt Maley, chief market strategist at Miller Tabak.   Subscribe to CNBC PRO for exclusive insights and analysis, and live business day programming from around the world. Yun Li | CNBC Markets and Investing Reporter @YunLi626 TOP NEWS  Dow plunges to end January as coronavirus fears mount CDC issues mandatory quarantine for first time in more than 50 years to Wuhan passengers in California US airlines suspend flights to mainland China as coronavirus spreads Amazon joins the trillion-dollar club again after knockout earnings report The slow race to make a coronavirus vaccine is on as nations try to speed yearlong process Friday's massive sell-off ruins 'January barometer' market signal Markets are putting pressure on the Federal Reserve for at least one rate cut Trump's Mar-a-Lago security breach: Officials fire shots at SUV that ran checkpoints, two in custody Murkowski to vote against witnesses in Trump trial, likely dooming Dem push for Bolton testimony Goldman Sachs expects coronavirus outbreak to weigh on US economic growth this quarter     TOP VIDEO Markets were overextended before sell-off, says investing pro   CNBC PRO This mutual fund returned over 400% last decade. Here are the stocks it's betting on now   SPECIAL REPORTS Markets slide as coronavirus outbreak worsens— here's what to watch IBM was the worst-performing large-cap tech stock during Rometty's tenure, dropping 24%   Unsubscribe Manage Newsletters Terms of Service Join the CNBC Panel Digital Products Feedback Privacy Policy   © 2020 CNBC LLC. All rights reserved. A property of NBCUniversal. 900 Sylvan Avenue, Englewood Cliffs, NJ 07632 Data is a real-time snapshot *Data is delayed at least 15 minutes. Global Business and Financial News, Stock Quotes and Market Data and Analysis. Data also provided by THOMSON REUTERS