By Sarah Kent 

LONDON--Swiss commodities traders are buying significant volumes of Africa's oil in opaque and lightly-regulated deals, according to a new report that spotlights their commanding position in the continent's energy markets.

Traders such as Glencore PLC and privately-owned Trafigura Beheer B.V. spent $55 billion buying a quarter of the oil produced by Africa's top 10 suppliers between 2011 and 2013, according to the report by a trio of nongovernmental organizations, the Berne Declaration, the Natural Resource Governance Institute and Swissaid.

Commodities traders have, for years, moved large volumes of oil around the world, capitalizing on price discrepancies in different regions. However, little quantitative analysis has been done on the scale of their trading activities, particularly in regions like Africa where public data on oil sales is hard to obtain.

The report's findings show that these mostly private companies have accumulated a substantial market share in Africa, competing on a level with giant international oil companies, refineries and state-controlled national oil companies for a share of the continent's oil wealth. In some cases, the Swiss trading houses dominate local export markets.

Swiss traders are the largest buyers of oil from the governments of Cameroon, Chad, Equatorial Guinea, Gabon and Nigeria, according to the report. Last year, Glencore was the sole buyer of crude sold by Chad's government. The $400 million the report estimated it paid for the oil represents 16% of the Chad government's annual revenues.

Glencore said it is committed to full compliance with all its statutory obligations to tax authorities and to reporting transparently on its tax payments to governments in the countries in which it operates.

The report didn't accuse the trading houses of any wrongdoing, but raised concerns about the lack of transparency in African markets. The findings play into a broader increase in international scrutiny of the global commodities industry, which has seen the European Union and the U.S. tighten their regulatory oversight of the sector. Switzerland is also considering increasing its requirement for payment transparency.

"The traders are kind of a natural fit for some of these high-risk, volatile countries because that's the kind of environment they're very good at working in," said Alexandra Gillies, head of governance at the Natural Resource Governance Institute and one of the authors of the report.

"The problem is the secrecy and lack of competition. We didn't come across any smoking guns, but the risks are very high and, I think, unacceptably high," she said.

Write to Sarah Kent at sarah.kent@wsj.com

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