China bans Micron’s products from key infrastructure over security risk

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China said that US chipmaker Micron Technology’s products posed “serious network security risks” as it banned operators of key infrastructure from buying them, in its first big measure against an American semiconductor group.

The Cyberspace Administration of China on Sunday announced that the company, which is the biggest US maker of memory chips, “posed significant security risks to China’s critical information infrastructure supply chain”. As a result, it ordered “critical national infrastructure operators” to stop purchasing products from Idaho-based Micron.

The move follows a seven-week investigation into Micron by the CAC, a probe that was widely seen as retaliation for US efforts to curb China’s access to key technology. Last October, Washington introduced expansive chip export controls and the Netherlands and Japan have since followed.

Analysts said Micron presented an obvious first target for Beijing as its tech would be more easily replaced with competitors’ chips from South Korean rivals Samsung and SK Hynix. Last month the White House asked South Korea to urge its chipmakers not to fill any market gap in China if the sale of Micron products was restricted.

China is an important market for Micron. Mainland China and Hong Kong generated 25 per cent of its $30.8bn in revenue last year, according to a person familiar with the matter.

Paul Triolo, an expert on China tech at consultancy Albright Stonebridge, said: “This could be really bad for Micron. It depends how broad China’s definition of critical information infrastructure is, but this could include the financial sector, transportation, energy and data centres.”

He added that data centres were a particularly important customer for Micron memory chips.

Beijing’s edict comes a day after G7 leaders issued a stark rebuke of China during the annual meeting of global leaders in Hiroshima, decrying its human rights record, “non-market” economic policies and increasing military assertiveness in the East and South China Seas.

Micron chief executive Sanjay Mehrotra was part of a delegation of business leaders who attended the G7 summit. He dined with US ambassador to Japan Rahm Emanuel and Citi chief Jane Fraser on Saturday night in the Japanese coastal town.

“We have received the CAC’s notice of conclusion of its review of Micron products sold in China,” Micron said in a statement. “We are evaluating the conclusion and assessing our next steps. We look forward to continuing to engage in discussions with Chinese authorities.”

China informed Micron of its decision in a meeting in Beijing on Sunday, according to a person familiar with the matter.

“This is new for China,” Triolo said of the Micron ban. “That it is not taking some of the US actions [to curb China’s access to technology] lying down.”

In its statement, the CAC said that “China welcomes global companies and various platform products into the China market as long as they follow China’s laws and regulations”. The regulator’s statement did not provide any information on the “security risks” posed by Micron’s products.

Analysts warned that Beijing’s restrictions could even prompt Chinese companies that did not provide “critical information infrastructure” to seek to eliminate Micron from their supply chains.

“The blast radius could be much bigger,” said Triolo.