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December 31 Premarket Briefing: 10 Things You Should Know

Tickers in this article: AAPL BRK.B CROX DIS FB PSX TWTR

Here are 10 things you should know for Tuesday, Dec. 31:

1.-- Today is New Year's Eve, the last trading session and the last day of the calendar year 2013 -- but you knew that already. Tomorrow is New Year's Day, Wednesday, Jan. 1, a national holiday, and the markets will be closed.

2.-- In the economic calendar in the U.S. for Tuesday: The Case Schiller home prices index is due at 9 a.m.; the release of the Chicago Purchasing Managers Index survey results are scheduled for 9:45 a.m.; and the Consumer Confidence Index survey results are scheduled for 10 a.m.

3. -- U.S. stock futures are pointing to a flat open and trading is expected to be light.

4.-- U.S. stocks on Monday closed flat amid light trading, the penultimate session for what is expected to be the best year for stocks since 1997. The S&P 500 is up 29% on the year and many investment strategists another gain in 2014.

However, the S&P finished down 0.02% Monday at 1,841.07. The Dow Jones Industrial Average was up 0.16% to 16,504.29, boosted by Walt Disney shares hit all-time highs. The Nasdaq dipped 0.06% to 4,154.20 as Apple shares slid.

5.-- Shares of Crocs , makers of trendy, casual footware, closed up over 21% Monday on news that Blackstone was taking a $200 million investment in the company. The deal gives Blackstone two seats on Crocs' board and preferred shares with a 6% dividend. The company also intends a buyback for common shareholders.

Crocs also announced CEO John McCarvel is retiring and giving up his board seat in April.

6.-- The Stoxx Europe 600 index rose 0.2% to 327.71. The German DAX 30 index fell 0.4%. The FTSE 100 index rose nearly 0.3% to 6,741.44, a gain of 14% for 2013.

Hong Kong's Hang Seng Index was up 0.3%. Japan's markets were closed Tuesday and for the remainder of the week.

7.-- Warren Buffett's firm Berkshire Hathaway agreed to acquire a unit of Phillips 66   that makes additives that help crude oil flow in pipelines for about $1.42 billion in stock. Buffett's company will buy the unit in exchange for about 19 million of its 27.2 million shares in Phillips 66. Phillips 66 stock closed at $74.72 Monday.

8.-- Adults' enthusiasm for Facebook remains strong, even as teens go elsewhere. A new study by the Pew Research Center  found that 71% of online adults are a member of the social network, up from 67% in 2012. Only 17% of adults are active on Instagram and 18% using Twitter , the study finds. However, some 42% are using multiple social media platforms.

9.-- The Washington Redskins fired coach Mike Shanahan and eight assistant coaches. According to ESPN, the Redskins were 24-40 under Shanahan's leadership. In a statement quoted by the news service, owner Dan Snyder said, "Redskins fans deserve a better result."