BRUSSELS—Europe's antitrust police have asked a broad swath of Internet commerce firms to hand over sensitive business information and copies of contracts as part of a sweeping investigation into possible abuses in the sector.

The investigation, announced in March, aims to establish whether some companies are raising contractual or other barriers to limit how consumers can shop online across national borders inside the European Union. It could lead to formal antitrust cases against individual companies that are suspected of abusing their dominant market position to restrict trade, in violation of EU law.

The European Commission, the bloc's top antitrust regulator, sent out the first batch of questionnaires last week to businesses in all 28 EU countries. More than 2,000 businesses are expected to be questioned as part of the probe, including online marketplaces like eBay Inc.; Internet streaming services such as Netflix Inc.; content producers like Disney; manufacturers that sell goods online; and broadcasters.

The questionnaires, running to more than 150 pages, aim to give regulators "a better understanding of e-commerce-related business practices as they affect providers of digital content," according to one copy seen by The Wall Street Journal.

They drill down into the competitive landscape in markets for digital content, including online films, news and music—asking firms to provide copies of contracts with their 30 main suppliers.

While the probe isn't aimed specifically at U.S. firms, the activities of some U.S. online giants are expected to come under serious scrutiny given their powerful presence in Europe's online economy. The EU's antitrust chief, Margrethe Vestager, said when she announced the probe that U.S. companies dominate parts of Europe's e-commerce sector.

The European Commission confirmed it had sent out the questionnaires last week but declined to comment further.

The length and nature of the questionnaire makes it seem like "a bit of a fishing expedition," said one Brussels-based antitrust expert.

Companies are asked to provide their sales figures globally and by EU country, in some cases dating back to 2010. They are asked to list their top 30 suppliers of various types of digital content, from films to music; how much each was paid; and about possible clauses that could restrict how the content is sold across national borders. They are also asked to hand over copies of "all agreements currently in force" with those suppliers.

Other questions focus on business models and tariff structures, how contracts are negotiated and financing decisions.

According to EU officials, the commission considered the administrative burden of lengthy questionnaires but ultimately thought it needed sufficient data to understand the region's complex digital markets. The impact will be much less for smaller firms, to which only parts of the questionnaire will be relevant, officials added.

The deadline for responses is July 31. A second questionnaire covering online sales of physical goods is expected to be sent out next week.

The EU plans to publish a preliminary report on its findings in mid-2016, and a final report in early 2017, after carrying out a public consultation.

The investigation is the latest in a flurry of separate probes and legislative initiatives in Europe that could end up curbing the businesses of U.S. Internet firms whose dominance of the region's online landscape is causing concern in top policy circles.

Internet giants like Google, Amazon, Apple Inc. and Facebook Inc. are being scrutinized over issues ranging from possible data-privacy violations to anticompetitive behavior to tax payments.

The EU will soon open a major inquiry into how large online companies operate in Europe, amid concerns that they have too much power over smaller firms. It could potentially lead to stringent new regulations for Internet firms.

Write to Tom Fairless at tom.fairless@wsj.com

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