U.S. stocks were poised for a lower open Friday amid uncertainty about a Greek bailout deal, but they remained on track for weekly gains.

S&P 500 futures fell seven points, or 0.3%, to 2094. E-mini Dow futures slipped 56 points, or 0.3%, to 17906. E-mini Nasdaq-100 futures lost 21 points, or 0.5%, to 4464. Changes in stock futures don't always accurately predict moves in the stock market after the opening bell.

Greek stocks tumbled 4.4%. The Athens stock market had closed before the International Monetary Fund said Thursday it had stopped negotiations with Greece due to a lack of progress. German Chancellor Angela Merkel on Friday called on all parties to return to the negotiating table. Germany's DAX fell 1% and France's CAC slipped 1.1%.

"There's a confluence of headlines coming out of Greece, and it's really tough to make heads or tails of it," said John Brady, managing director at futures brokerage R.J. O'Brien. He said the uncertainty weighed on stock futures.

Stocks rose slightly Thursday, with the Dow Jones Industrial Average adding 0.2% to 18039.37. The blue-chip index's two-day gain was its biggest since May 8. The S&P 500 rose 0.2% to 2108.86.

The Dow industrials are on track to rise for the week, up 1.1% through Thursday's close. The S&P has added 0.8% and the Nasdaq has advanced 0.3% in the same period. This week marks a departure from recent ones, in which the Nasdaq's gains have outpaced those of the Dow and S&P. For the year, the Dow has advanced 1.2% and the S&P has risen 2.4%, while the Nasdaq has rallied 7.3%.

Investors will receive a reading on inflation in May at 8:30 a.m. ET. The producer-price index is expected to rise 0.4% in May, according to economists surveyed by The Wall Street Journal. Excluding the volatile food and energy categories, prices are expected to advance 0.1%.

The heightened focus on economic reports comes as investors gauge whether U.S. economic growth is strong enough for the Federal Reserve to raise interest rates later in the year. Recent upbeat data, including robust retail sales in May, have bolstered expectations the Fed will increase rates as early as September.

The yield on the 10-year Treasury note was at 2.380%, compared with 2.383% on Thursday. Yields fall as prices rise.

In commodity markets, gold futures were nearly flat at $1180.60 an ounce. Crude-oil futures fell 1.3% to $60.01 a barrel.

Twitter Inc. shares rose 3.2% in premarket trade. The company said late Thursday Dick Costolo would step down as chief executive.

Write to Saumya Vaishampayan at saumya.vaishampayan@wsj.com

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