Wall Street appeared reluctant to build on the prior day's gains Wednesday, as U.S. stock-market futures pointed lower, with a risk-averse mood creeping in ahead of the two-day European Union summit.

In high-profile U.S. corporate news, more brokers initiated coverage on Facebook Inc. (FB) overnight. Shares had yet to respond significantly in premarket action.

Futures for the Dow Jones Industrial Average fell 7 points to 12479, while those for the S&P 500 index rose 0.5 point to 1316. Futures for the Nasdaq 100 index also were up 0.5 point at 2548.75.

Oil and gold futures were slipping, while the dollar steadied.

U.S. stocks posted mild gains in a choppy prior session Tuesday, after home prices posted their first monthly rise since last autumn. The Dow industrials rose and later fell before ending up 32.01 points, or 0.3%, at 12534.60. The S&P 500 index and the Nasdaq Composite gained 0.5% and 0.6%, respectively.

Asia stocks finished mostly higher, led by a 1% rally for the Hang Seng Index, while gains in Europe were tepid on the eve of a two-day EU summit. Ahead of that Brussels gathering, investors will also be watching for news from an evening meeting between Chancellor Angela Merkel and French President Francois Hollande in Paris.

"In general, it is wait-and-see up to the EU summit," said Anders Moller Lumholtz, senior analyst at Danske Bank. "Most analysts and commentators have the view that this is another disappointment. It's funny this time as expectations are very low. If we can avoid an open disagreement with Italy's [Prime Minister Mario] Monti, then the disappointment will end up not being that big."

Focus will return next week to the European Central Bank, where many are expecting a cut in rates, said Lumholz.

Amid this expectation, he said, Wall Street is likely to remain range-bound. More data to come for Wednesday include U.S. durable-goods orders for May at 8:30 a.m. EDT and pending home sales for May from the National Association of Realtors at 10 a.m. EDT.

Shares of Facebook could be in focus after several brokers began coverage of the Menlo Park, Calif., social-networking operator. Bank of America Merrill Lynch, Barclays Capital and Citigroup Inc. (C) began coverage somewhat cautiously, while the bullish case was outlined by Goldman Sachs Group Inc. (GS).

Best Buy Co. shares (BBY) could be in focus after jumping the prior day on speculation that the retailer's founder, Richard Schulze, is exploring a bid to take the company private.

Write to Barbara Kollmeyer at barbara.kollmeyer@dowjones.com

HOT STOCKS TO WATCH

Among the companies with shares expected to actively trade in Wednesday's session are AeroVironment Inc. (AVAV), O'Reilly Automotive Inc. (ORLY) and Omeros Corp. (OMER).

AeroVironment's fiscal fourth-quarter earnings edged up 0.9% as the company recorded an increase in unmanned aircraft revenue, though margins weakened. Shares jumped 9.1% to $27.75 after hours as earnings beat analyst expectations and the company issued an upbeat outlook for the new fiscal year.

O'Reilly said it expects its second-quarter earnings to be at the low end of its prior estimates, as the auto-parts retailer also lowered its same-store sales guidance. Shares slumped 8.8% to $88 after-hours Tuesday as the company said June same-store sales missed its expectations.

Omeros plans to offer an undisclosed number of shares for the biopharmaceutical company's development of two medical products being tested for use in eye and knee surgeries and other general purposes. Shares dropped 14% to $11.35 after hours.

Alexza Pharmaceuticals Inc. (ALXA), which develops treatments for conditions affecting the central nervous system, said it plans to offer as much as $40 million in mixed securities, which may include stock. Shares were off 2.1% to $4.20 after hours.

Campus Crest Communities Inc. (CCG), which develops, builds and manages college student housing, said it will offer six million shares. Shares slipped 3.5% to $10.34 after hours.

Watch List:

An Ohio court has granted Aetna Inc.'s (AET) request to temporarily stop the state from moving forward with its Medicaid contract process, as the insurer protests an Ohio agency's decision to cancel an earlier Medicaid contract it was awarded.

Atlantic Power Corp. (AT, ATP.T) said it will offer 5.5 million shares of its stock, intending to use the proceeds to fund a recently acquired wind-energy project under construction in Oklahoma.

Boeing Co. (BA) abruptly changed the chief executive of its commercial unit on the eve of a major air show where the jet maker is expected to announce significant orders for a new version of its 737 Max aircraft. Ray Conner, the senior vice president of sales and customer support for Boeing Commercial Airplanes, was named on Tuesday to replace Jim Albaugh, 62, once considered a CEO candidate.

Bristol-Myers Squibb Co. (BMY) has added $3 billion to its share repurchase program, as the pharmaceutical company looks to boost shareholder value.

Digital Realty Trust Inc.'s (DLR) upsized offering of 10 million shares of stock priced at a 0.8% discount to its Tuesday closing price.

Natural-gas utility Gas Natural Inc. (EGAS) said Chief Executive Richard M. Osborne will offer 700,000 shares of the company's stock.

Standard & Poor's Ratings Services downgraded GeoEye Inc. (GEOY) two notches, saying the satellite-imaging company faces heightened risk of lower U.S. government revenues.

H&R Block Inc.'s (HRB) fiscal fourth-quarter earnings fell 11%, as higher filing volume was masked by weaker revenue and losses from discontinued operations.

Liberty Global Inc. (LBTYA, LBTYB), along with investment funds tied to Searchlight Capital Partners LP, Tuesday agreed to acquire OneLink Communications, in a roughly $585 million deal expected to form Puerto Rico's largest cable operator.

Standard & Poor's Ratings Services placed its ratings for Ryder System Inc. (R) on watch for a possible downgrade after the truck-leasing company lowered its full-year earnings guidance last week.

Sealy Corp. (ZZ) swung to a second-quarter profit as the company posted wider margins, reflecting higher pricing on luxury mattress sales.

Write to Nathalie Tadena at nathalie.tadena@dowjones.com

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