Stocks fell on Friday to close out a choppy first trading week of the year. The Nasdaq led market benchmark declines, sliding over 140 points, while the Dow Jones Industrial Average and S&P 500 slipped 0.01% and 0.41%, respectively, into the red.

The Nasdaq also posted its worst week since last February, falling roughly 4.5%. The S&P 500 also declined by 1.8%, while the Dow only lost 0.29%.

Here's how the market settled to close out the week:

S&P 500 Index (SPY  ): -0.41% or -19.03 points to 4,677.02

Dow Jones Industrial Average (DIA  ): -0.01% or -4.81 points to 36,231.66

Nasdaq Composite Index (QQQ  ): -0.96% or -144.96 points to 14,935.90

Citigroup to require all employees to be fully vaccinated against COVID-19:

Citigroup (C  ) will be the first major Wall Street institution to fully enforce its COVID vaccine mandate by terminating unvaccinated employees by the end of the month, according to a memo reviewed by Bloomberg News.

The bank reiterated in a memo to employees sent out Friday that its new employment policy, which was first disclosed in October, has added being fully vaccinated against COVID as a mandatory condition. The bank said that employees have to submit proof of vaccination by Jan. 14, Bloomberg reports.

Those who have not compiled to the new policy by next week will be put on unpaid leave, with their last day of employment being Jan. 31, Bloomberg reports.

December jobs report disappoints:

The U.S. economy posted an unexpected slowdown in hiring in December compared to November, but the unemployment rate continued to improve as the labor market maintains its improvement from its pandemic-era lows.

Non-farm payrolls increased by 199,000 last month, according to the Labor Department's report published Friday, coming in below the 450,000 expected by consensus economists and November's revised print of 249,000.

Despite the disappointing headline, December marked the twelfth consecutive month of job growth. Moreover, the unemployment rate fell to 3.9% in December, posting its lowest level since February 2020. The rate was also below the 4.1% expected and November's rate of 4.2%.

Leisure and hospitality jobs, some of the hardest impacted by the pandemic, rose by 53,000 for December, above November's gain of 41,000.

Here's how market benchmarks started trading soon after opening bell:

S&P 500 Index: -0.07% or -3.36 points to 4,692.69

Dow Jones Industrial Average: -0.23% or -84.89 points to 36,151.58

Nasdaq Composite Index: -0.14% or -15.78 points to 15,059.67