By Eric Yep 

SINGAPORE--China is on an oil-buying spree again.

China National United Oil Corp., the trading unit of state-run China National Petroleum Corp. known as Chinaoil, has bought a total of 19 physical oil cargoes for delivery in June or July so far in April, Singapore-based traders said. That is equal to 9.5 million barrels of oil, and is Chinaoil's largest spot market purchase since October last year when it bought a country record 47 cargoes, or 23.5 million barrels of oil.

With over half a month of trading still left, Chinaoil could surpass its October volumes if it keeps up its current buying pace.

Chinaoil's purchases were made through what traders call the "e-window" operated by Platts, a commodities price reporting agency and unit of McGraw Hill Financial Inc.

Through this mechanism, traders submit their bid and offer prices for Dubai crude, and oil of similar grades like Oman and Upper Zakum, broken into smaller lots of 25,000 barrels each, called "partials."

The trading of physical oil cargoes on the spot market is typically done in private, but participating in the Platts window makes the prices public. The prices at which transactions are completed in turn contribute to benchmarks published by the pricing agency.

Chinaoil's record purchases in October last year contributed to China's oil imports in December hitting a record of around 7.3 million barrels a day.

Analysts have suggested that large oil purchases by Chinese trading firms are part of efforts to build the country's emergency stockpiles during a time of low oil prices. However, traders say stockpiling may not be the only motive for them to participate in a public oil-trading mechanism like the one Platts operates.

National oil companies like those in China are increasingly active in contributing to setting price levels rather than waiting to see what pricing agencies publish, said Adi Imsirovic, general manager at trader Clearsource Commodity Resources.

"That is what Chinaoil is doing now, and together with Shell and Unipec, they have become a major player in the Platt's Dubai market," he said. "Asian players...have become 'price makers' rather than 'price takers'."

Write to Eric Yep at eric.yep@wsj.com

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