(Bloomberg) -- The Trump administration is poised to add chipmaker SMIC and offshore oil-and-gas explorer CNOOC to a list of firms blocked from American investment due to military ties, Reuters reported, in the latest U.S. swipe at Beijing before President-elect Joe Biden takes office.Semiconductor Manufacturing International Corp. and China National Offshore Oil Corp. are among four Chinese companies to be added to a list of firms owned or controlled by the military, Reuters reported, citing a document seen and three unidentified people familiar with the matter. Their addition -- along with China Construction Technology Co. Ltd. and China International Engineering Consulting Corp. -- would bring the total number of firms on the blacklist to 35.It wasn’t clear when the new list would be published in the Federal Register, Reuters said. The Defense Department didn’t respond to Reuters’ request for comment. CNOOC didn’t respond to emailed requests for comment. Cnooc Ltd., the company’s listed unit, fell as much as 11% in Hong Kong. China Oilfield Services Ltd., its drilling subsidiary, fell as much as 12%.“There will be huge impact on the company because the oil-and-gas value chain involves a lot of U.S. companies from upstream, mid-stream all the way to the gas side,” said Sengyick Tee, an analyst with SIA Energy. “This also means they cannot procure parts and software from U.S. companies.”A Pentagon spokesperson didn’t immediately reply to Bloomberg’s request for comment on the report. Reuters separately reported last week that the Trump administration was close to issuing a list of 89 Chinese aerospace and other companies that would be unable to access U.S. technology exports due to their military ties.President Donald Trump, a Republican, has continued to roll out punitive measures against China despite losing the U.S. presidential election earlier this month to Biden, a Democrat. The actions will make it harder for the incoming administration to de-escalate tensions with Beijing, although they will also arguably give the U.S. side more leverage in future negotiations.In a related executive order earlier this month, the U.S. said China was “increasingly exploiting” American capital for “the development and modernization of its military, intelligence, and other security apparatuses,” posing a threat to the U.S. That order prohibits investment firms and pension funds from buying and selling shares of 31 Chinese companies designated by the Pentagon since June as having military ties.In response to the previous order, the Chinese Foreign Ministry accused the U.S. of “viciously slandering” its military-civilian integration policies and vowed to protect the country’s companies. “This not only severely harms the legitimate rights and interests of Chinese companies, but also the interests of foreign investors including U.S. ones,” ministry spokesman Wang Wenbin said at the time, urging the order’s withdrawal.Exxon, ShellState-owned CNOOC, the country’s main deepwater oil and gas explorer, has ties to key global energy producers and projects. The firm is among Exxon Mobil Corp.’s partners in its Guyana project, owns a stake in a Royal Dutch Shell Plc LNG export terminal in Australia, and has a share in the U.K. North Sea’s Buzzard oil field.CNOOC’s main base of operations are the coastal waters surrounding China, which account for more than 60% of its listed company’s production, with the majority coming from the Bohai Sea near Beijing.“It will be quite negative for CNOOC as it has quite a few U.S. partners in projects alongside Bohai Bay as well as in South China Sea,” Lin Boqiang, director at the China Center for Energy Economics Research at Xiamen University, said by phoneOperations in the South China Sea, which account for about 29% of output, have at times run into controversy because China claims drilling rights in waters far from its borders, and within 200 miles of countries like Vietnam and the Philippines. The firm also owns interests in shale and deepwater projects in the U.S., accounting for production of about 67,000 barrels of oil equivalent a day, according to its website.SMIC said in a statement that it is engaged in constructive discussions with the U.S. government, adding it has no relationship with the Chinese military and doesn’t manufacture for military uses. Its shares were little changed in Hong Kong.SMIC RestrictionsIn September, the U.S. Commerce Department separately imposed export restrictions on SMIC, requiring American firms to apply for a license to send certain products to China’s largest chipmaker. SMIC and its subsidiaries present “an unacceptable risk of diversion to a military end use,” the department’s Bureau of Industry and Security wrote.SMIC represents a cornerstone in China’s vision of creating its own, world-class semiconductor industry, which the Communist Party sees as an essential foundation for a self-sufficient technology sector. The company is the country’s biggest contract manufacturer of chip and raised more than $7 billion to expand in a Shanghai stock offering in July.SMIC still has far to go to catch up to rivals such as Taiwan Semiconductor Manufacturing Co., which makes chips for Apple Inc.’s most advanced smartphones. TSMC, the world’s largest contract chipmaker, is commercializing 5 nanometer technology, at least two generations ahead of SMIC’s capabilities.A Trump administration blacklisting would make that effort more difficult -- if not impossible -- because SMIC could be barred from American suppliers such as Applied Materials Inc., which tend to make the most advanced chip-making equipment.(Updates with SMIC comment in 12th paragraph.)For more articles like this, please visit us at bloomberg.comSubscribe now to stay ahead with the most trusted business news source.©2020 Bloomberg L.P.