NEW YORK (TheStreet) -- Stock futures rose with the Nasdaq looking to extend a record high set on Thursday but markets were on edge as continuing Greek debt talks triggered investor nerves. 

S&P 500 futures were up 0.11%, Dow Jones Industrial Average futures gained 0.1%, and Nasdaq climbed 0.16%. 

The European Central Bank reportedly raised its funding cap on Emergency Liquidity Assistance for Greece's banks, according to Reuters. The move follows on from failed debt talks at a Eurogroup meeting on Thursday. 

European Council President Donald Tusk has called an emergency summit for further debt talks on Monday. Eurozone finance ministers from 19 countries will convene to try to overcome the stalemate. Eurozone finance ministers want Greece to introduce a round of austerity measures in exchange for further debt relief. Greece has until the end of the month to repay its debts to the International Monetary Fund. Click here for more.

Trading could be more volatile than usual on Thursday given it is a quadruple-witching session, one of four days of the year in which futures and options contracts expire at once. There is no economic data due out Friday.

Hershey (HSY) slid 2.4% in premarket trading after the chocolate company reduced its 2015 forecast on weakened growth in China. The company expects full-year earnings of $4.10 to $4.18 a share, below estimates of $4.31 a share. 

Fitbit (FIT) shares looked to extend Thursday's gains, climbing 1.2% before the bell. The wearable tech company surged in its market debut on the New York Stock Exchange on Thursday, rocketing 48% higher to $29.68, well above its initial pricing of $20 a share for its float of 36.6 million shares.

ConAgra Foods (CAG) added 5.6% on news Jana Partners had taken a 7.2% in the company. The activist investor argued the company's shares are undervalued and is seeking a change in its board. 

Sequential Brands (SQBG) and Martha Stewart Living Omnimedia (MSO) were on watch after a late-day surge a day earlier. The two gained on a Wall Street Journal report that Sequential Brands was nearing an agreement to purchase Martha Stewart for an undisclosed amount. Martha Stewart jumped 26.3%.

CarMax (KMX) slid nearly 5% in premarket trading after reporting in-line quarterly earnings and a revenue miss. The car dealership reported a 4.9% increase in used unit sales at comparable stores. 

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