NEW YORK (TheStreet) -- With only minutes left in the session, the six-day Christmas rally swiftly ended just in time for the holiday break. After extending record closes set a day earlier, the Dow Jones Industrial Average and S&P 500 erased earlier gains to close at the flatline.

The S&P 500 was flat, the Dow gained just 6 points to eke out a new record close, and the Nasdaq climbed 0.17%. Over the past five days, the S&P 500 has jumped more than 5% to new highs, a rally fueled by the Federal Reserve's promise to be "patient" in raising rates next year.

STOCKS TO BUY: TheStreet Quant Ratings has identified a handful of stocks that can potentially TRIPLE in the next 12 months. Learn more.

Weekly jobless claims slid for the fourth straight week, an indication of steady improvement in the job market. The number of new claims for unemployment benefits slid 9,000 to 280,000. Economists had expected 290,000 claims after a reading of 289,000 a week earlier.

Crude oil prices were giving back some of Tuesday's gains. West Texas Intermediate crude was down 2.7% to $55.56, while major oilers Exxon Mobil (XOM) and Chevron (CVX) were lower and the Energy Select SPDR ETF (XLE) dropped 0.77%. Crude prices had seen a brief rebound on Tuesday after Arab OPEC producers said they expect global oil to rebound to between $70 and $80 a barrel by end-2015.

Japan's parliament re-elected Prime Minister Shinzo Abe on Wednesday after his win at the polls earlier December. Abe has been charged with restoring growth in the world's second-largest economy through monetary policy easing and stimulus. Tokyo's Nikkei bounced 1.2%.

There were more troubles for Russia's economy after Standard & Poor's placed it on its CreditWatch Negative list. Russia's ruble has been in freefall alongside oil prices and the economy has suffered from Western sanctions imposed after the country's involvement in Ukraine.

"We are reviewing our assessment of Russia's monetary flexibility and the impact of the weakening economy on its financial system," the agency said in a statement. Standard & Poor's will determine whether the nation's debt is downgraded to junk status completes its review by mid-January.

Citigroup (C) shares inched 0.22% higher on news Japan's Sumitomo Mitsui Banking Corp. will buy the bank's regional retail operations for around $330 million, according to Reuters.

Petrobras (PBR) slid more than 1% after Moody's placed the stock on review for downgrade due to "potential liquidity pressures." Over the past 6 months, the oil company has plummeted nearly 50% alongside oil prices. 

American Airlines (AAL) climbed 2.4% after the company said it plans to increase flight attendants' wages 4 percentage points due to increased profits on lower oil prices.

Sony (SNE) shares climbed 2.2% after the studio confirmed it will release 'The Interview' via Google's (GOOGL) YouTube. A day earlier, the studio confirmed plans to distribute to more than 200 independent theaters Christmas Day.

Walgreen (WAG) shares gained 0.21% after Credit Suisse increased its price target to $73 based on the company's long-term growth opportunities.

Facebook (FB) climbed 0.2% after the social network scored a deal to integrate National Football League video clips with ads from Verizon (VZ) .

The New York Stock Exchange and Nasdaq are closed Thursday for the Christmas Day public holiday and will resume normal operations on Friday.

STOCKS TO BUY: TheStreet Quant Ratings has identified a handful of stocks that can potentially TRIPLE in the next 12 months. Learn more.

--Written by Keris Alison Lahiff in New York.

More from Markets

Week Ahead: Trade Fears and Stress Tests Signal More Volatility To Come

Week Ahead: Trade Fears and Stress Tests Signal More Volatility To Come

Trump Takes Aim at Auto Imports; Markets End Mixed -- ICYMI

Trump Takes Aim at Auto Imports; Markets End Mixed -- ICYMI

Video: What Oprah's Content Partnership With Apple Means for the Rest of Tech

Video: What Oprah's Content Partnership With Apple Means for the Rest of Tech

REPLAY: Jim Cramer on the Markets, Oil, Starbucks, Tesla, Okta and Red Hat

REPLAY: Jim Cramer on the Markets, Oil, Starbucks, Tesla, Okta and Red Hat

Flashback Friday: The Market Movers

Flashback Friday: The Market Movers