When the already rocky markets are subjected to a quadruple witching day, investors should anticipate a day filled with volatility. Witching days are when various types of options all expire at the same time. On Friday, futures, various options, single stocks and ETFs are all set to expire, according to CNBC. Combined with the meeting in Europe of key leaders to discuss the Greek situation, Friday is expected to be a tense day. Stocks rallied on Thursday due to pledge of multiple central banks to support EU banks. The Dow was up 186 points, closing at 11,433 on Thursday, based upon a powerful pledge by the European Central Bank, the U.S. Federal Reserve and three other central banks to supply unlimited dollar loans to the European banks. The Associated Press indicated the joint pledge was more powerful than any one entity promising its support. It was also needed to support the markets after the downgrade of the credit rating of some of the French banks and the loss of $2 billion by UBS due to a rogue trader. Unemployment claims increased by 11,000 to 428,000 The first time jobless claims reported by the Department of Labor once again rose by 11,000 to 428,000 as reported by the Associated Press. Claims must fall below 375,000 consistently to indicate a recovery is occurring. Yahoo rumored to be for sale. According to USA Today, Yahoo may be discussing a takeover with several large hedge fund providers. None of the rumors could be confirmed. Due to the recent departure of Yahoo's Chairman and the apparent voting structure of the company, experts indicate a takeover would be very easy. Obama administration may have ignored warnings about Solyndra According to the Associated Press, the Obama administration may have ignored warnings about Solyndra prior to its receipt of a $500 million loan from the US government. Solyndra is a solar panel manufacturer that was held up by the President as a model for his green energy policies. It recently declared bankruptcy. Apparently the Department of Energy lacked the controls to manage the loans to these types of organizations, and therefore no oversight existed. Pricewaterhouse Coopers also issued a troublesome report about the company. Emails obtained by the Associated Press from the White House indicated that approvals were being pushed faster than the examiners felt comfortable about. Jay Carney, White House spokesperson, indicates there is no evidence that the White House was involved in pressuring the approval of the loans. In a meeting earlier this year, the loan was subordinated to the loans of private investors. The Treasury Department and the FBI are now investigating Solyndra. Largest Internet IPO anticipated of Chinese company The Wall Street Journal reports that the largest IPO of an internet company is soon to be offered on behalf of Beijing Jingdong Century Trading Company which owns 360Buy.com. This is China's largest online shopping market. It wants to raise $4.5 billion in 3 years. It currently has 12,000 employees but is not yet profitable.