Key Takeaways:
South Korea's rejection of a congressional report alleging discrimination against Coupang is pushing the U.S.-South Korea alliance toward a tariff confrontation that could unwind a $350 billion trade pact.
South Korea's dismissal of a House Judiciary Committee report alleging a targeted campaign against U.S.-based retailer Coupang is straining relations with Washington, with congressional and White House officials warning the dispute could trigger additional tariffs on Seoul if unresolved. The standoff centers on Seoul's response to a 2025 data breach at the Seattle-headquartered company, which does the bulk of its business in South Korea.
"This isn't about just some commercial dispute," said Chris Stewart, president of lobbying firm Skyline Capitol and a former Republican congressman from Utah. "Policymakers, leaders in Congress and the White House understand this is really about the relationship between two key allies." Stewart cautioned against a "tit-for-tat" escalation but noted "ultimately the president has the power of tariffs, which can be very powerful."
The Republican-led report, released in July, alleges South Korean authorities mounted an unprecedented offensive against Coupang after a breach the company says exposed data tied to roughly 3,000 accounts. Seoul counters that 37.55 million people were affected and in June levied a 625 billion won ($409 million) fine — the largest data-privacy penalty in the country's history, according to the New York Times — for the breach and alleged illegal collection of personal information. Coupang reported 2025 revenue of $34.5 billion, and Seoul noted the fine fell far short of the 3 percent of revenue it could have charged.
The dispute is escalating through formal trade channels. Senator Bernie Moreno, a Republican from Ohio, on Aug. 27 urged U.S. Trade Representative Jamieson Greer to open a Section 301 investigation into South Korea and prepare proportionate response measures, calling the treatment of Coupang "an open act of hostility." Two Coupang investors — Greenoaks Capital Partners, the company's No. 2 shareholder with 3.38 percent of shares outstanding, and Altimeter Capital — petitioned Greer in January for a Section 301 probe and filed notice of intent to pursue investor-state dispute settlement arbitration. A 90-day consultation period ended April 22 without a settlement.
The Coupang fight is colliding with a broader unraveling of the U.S.-South Korea economic relationship. South Korea is the seventh-largest U.S. trading partner, according to the Census Bureau, and in 2025 the two countries renegotiated a trade deal granting Seoul a lower tariff rate in exchange for a $350 billion investment in U.S. shipbuilding and national security. Secretary of State Marco Rubio told the House Foreign Affairs Committee in June that South Korea's behavior toward American companies "impacted our ability to conclude a trade agreement."
Washington has already moved against Seoul. President Donald Trump imposed new import duties on South Korea in July citing forced-labor violations, and on Aug. 16 said he would scale back annual military drills with the country. A White House official said there is "no direct connection" between the Coupang dispute and the drill decision, but cited a Trump executive order targeting foreign governments that overregulate U.S. technology companies, adding that Seoul "has been misaligned with us on a number of bilateral issues."
The stakes extend beyond Coupang. The congressional report details a covert operation in which South Korean authorities allegedly compelled the company to hire divers to retrieve a laptop used in the breach from a river in Shanghai, with call logs showing more than 200 calls between officials and Coupang representatives. Seoul denies the allegations, saying its National Intelligence Service conducted only "working-level consultations." The last time Washington escalated tariffs on a treaty ally over regulatory treatment, the affected sector saw trade volumes fall within months — a precedent that hangs over the roughly 30,000 U.S. troops and extended nuclear deterrence that anchor the alliance.
If the USTR opens a Section 301 investigation, trade tensions could escalate further, with foreign media flagging the possibility of U.S. tariffs on South Korean goods that would complicate bilateral negotiations. If Seoul and Washington reach a resolution, the $350 billion investment commitments and lower tariff rate remain intact. Coupang, which donated $1 million to Trump's inaugural fund and counts Federal Reserve Chairman Kevin Warsh as a former board member, says it seeks "a constructive resolution that will strengthen the US-ROK alliance."
This article is for informational purposes only and does not constitute investment advice.
