NEW YORK (TheStreet) -- Stocks ended Friday's trading day lower and are mixed for the week.

The S&P 500 closed down 0.70%, the Dow Jones Industrial Average slipped 0.78%, or 140 points, and the Nasdaq declined 0.62%. For the week the, the S&P 500 ended flat, rising just 0.06%. The Dow eked out a 0.28% gain, while the Nasdaq fell 0.34%.

European stocks also entered negative territory, as Germany's DAX, France's CAC 40 and the FTSE 100 closed lower. The Stoxx Europe 600 index ended the week just 0.1% higher.

Germany is planning for the possibility of a Greek exit from the euro, according to a German tabloid, after technical talks between the debt-ravaged nation and the International Monetary Fund broke down on Thursday. Germany is reportedly taking precautionary preparations such as capital controls in case of a default.

Crude oil declined on Friday with West Texas Intermediate falling 1.3%, settling at $59.96. The drop in commodity prices hit the energy sector with Exxon Mobil (XOM), Chevron (CVX) and Chesapeake Energy (CHK) falling and the Energy Select Sector SPDR ETF (XLE) down 1.12%.

Wingstop (WING) shares surged in their market debut, opening up 58% to $30.47. The wings restaurant's float of 5.8 million shares was priced at $19 a share, far higher than expectations of $12 to $14.

Twitter (TWTR) gained 1.3% on Friday on news Dick Costolo has stepped down as CEO with Chairman Jack Dorsey to act as CEO on an interim basis. The change will take effect July 1. However, shares gave up most of their gains, closing up just 0.11%.

United Rentals (URI) added almost 2% after Reuters reported that activist investor Jana Partners scooped up a 6% stake in the equipment rental company.

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