US Markets

Dow closes down about 300, S&P off nearly 2% as oil slumps

Cashin: Technicals 'not very good at all'
Cashin: Technicals 'not very good at all'
Pisani: Market gaps down 200 points at open
Pisani: Market gaps down 200 points at open

U.S. stocks closed out a volatile week with sharp losses Friday, as oil hit near-seven-year lows and another corporate merger weighed ahead of the Fed's highly anticipated decision on rates next week. News of a roughly $800 million junk bond fund preventing withdrawals also unnerved markets. (Tweet This)

The S&P 500 had its worst week since the middle of August, while the Dow Jones industrial average and the Nasdaq composite had their worst week in a month. The major averages ended the week with losses of more than 3 percent, with the Nasdaq composite the worst performer, off about 4 percent for the week.

"What really conspired to weigh on investors today is they weighed on the Dow-DuPont combination as a move to battle low growth. And here it is, oil, telling us the same thing," said Jack Ablin, chief investment officer at BMO Private Bank. "That and then retail sales came in OK, but lower than expectations. Just a fair amount of negativity."

"I think investors are now taking buybacks and mergers with an amount of skepticism. Attitudes are changing," he said.

Year-to-date performance

The major averages fell more than 1.5 percent Friday, with the Nasdaq composite underperforming to close down 2.2 percent and below the psychologically key 5,000 level for the first time since Nov. 17. Apple ended nearly 2.6 percent lower.

The S&P 500 ended about 1.9 percent lower after briefly falling 2 percent as energy lost more than 3 percent to lead all 10 sectors lower.

The Dow Jones industrial average closed about 310 points lower. DuPont and Goldman Sachs were the greatest weights on the index as all constituents declined.

U.S. crude oil futures settled down $1.14, or 3.10 percent, at $35.62 a barrel, its lowest settle since February 2009 after hitting a fresh low going back to that year in intraday trade.

A worker stands next to a pump jack at an oil field Sergeyevskoye owned by Bashneft company north from Ufa, Bashkortostan, Russia.
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WTI lost 10.9 percent for the week to post its third-straight negative week for the first time since the eight-week losing streak ended Aug. 21, 2015.

Earlier, oil held lower after Baker Hughes said the U.S. oil rig count fell 21. Oil hit new lows after the International Energy Agency (IEA) warned global oversupply could worsen in the new year. fell below $38 a barrel to hit its lowest since late December 2008.

Read MoreOil and the Fed are giant uncertainties for stocks

"It's a nervous market here and that's moving due to the fact I think the market wants to hear from the Fed its intentions of future rate hikes," said Peter Cardillo, chief market economist at First Standard Financial.

"Oil barely hanging in above $36. If we dip underneath, that could add to the selling pressure," he said.

The Alerian MLP ETF (AMLP), which tracks large- and mid-cap energy master limited partnerships, ended down 6.7 percent, off session lows but down 41 percent for the year so far.

The Federal Reserve is due to meet Dec. 15 and 16, and could raise rates for the first time in nine years.

"The precipitous decline in oil may be something (the Fed) pauses on but I suspect they say it's something that will pass," said Bill Stone, chief investment strategist at PNC Asset Management.

Read MoreGundlach: Fed would not raise rates today

U.S. chemical giants DuPont and Dow Chemical officially agreed to merge in an all-stock deal to form a combined company valued at $130 billion. The new firm, to be called DowDuPont, is expected to eventually separate into three entities.

Despite a decline of 5.5 percent Friday, DuPont ended the week up about 4 percent. Dow Chemical fell 2.8 percent Friday to end the week up 0.11 percent.

Also in focus was news that New York-based Third Avenue Management is blocking investors from withdrawing their money from a nearly $1 billion junk bond fund as it tries to liquidate the fund in the biggest failure in the U.S. mutual fund industry since the Primary Reserve Fund "broke the buck" during the 2008 financial crisis.

Read More Are Third Avenue woes a sign of the next crisis?

"If we're seeing cracks in the high-yield market, that may weigh on equities," said Art Hogan, chief market strategist at Wunderlich Securities. "Oil's been under pressure all week. That's not a new story. DuPont, Dow, caps off a massive year of M&A activity and that doesn't always point to a positive economy in the year to come."

The SPDR Barclays High Yield Bond ETF (JNK) and iShares iBoxx USD High Yield Corporate Bond ETF (HYG) closed about 2 percent lower, off session lows but near levels last seen during the financial crisis.

BlackRock closed down 6.5 percent, as diversified financials underperformed. Legg Mason and Charles Schwab were off about 4.5 percent each.

Read MoreCarl Icahn: No liquidity for high-yield bonds, market is a 'keg of dynamite'

"It's been an incredibly challenging market for the broader market and also the financial services stocks because you've seen some pressure ... on interest rate expectations, negative impacts on earnings power, increased caution for credit events which we haven't seen for some time," said Devin Ryan, banking analyst and managing director at JMP Securities.

Treasury yields were lower, with the near 0.88 percent and the 10-year yield at 2.13 percent in the close.

The U.S. dollar held about 0.3 percent lower against major world currencies, with the euro around $1.098. The yen was at 120.91 yen against the greenback in the close.

China's yuan continued to weaken and fell to a fresh low against the dollar since 2011.

The CBOE Volatility Index (VIX), widely considered the best gauge of fear in the market, briefly traded above 25 before ending sli