South Korea's Antitrust Watchdog Weighs Record $7.4 Billion Fine on 15 Brokerages, Banks Over Bond Collusion

South Korea's Fair Trade Commission (KFTC) has initiated sanction deliberations against 10 securities firms and 5 banks accused of sharing interest rate and price information ahead of government bond auctions, with industry observers projecting fines could reach up to 11 trillion won (approximately $7.4 billion). The financial firms are pushing back, arguing the activity constituted "information exchange for loss avoidance" rather than classic collusion, while concerns mount that large-scale sanctions amid inter-agency disagreements could destabilize the entire government bond primary market.

According to investment banking industry sources and the financial investment and banking sectors on the 21st, the KFTC plans to hold a plenary session on August 19-20 to deliberate on sanctions against 15 financial firms acting as Primary Dealers (PDs) for government bonds. The targeted entities include 10 securities firms — Kyobo Securities, Daishin Securities, Meritz Securities, Mirae Asset Securities, Samsung Securities, Shinhan Investment Corp, NH Investment & Securities, KB Securities, Kiwoom Securities, and Korea Investment & Securities — along with 5 banks: Kookmin Bank, Industrial Bank of Korea (IBK), NongHyup Bank, Korea Development Bank (KDB), and Hana Bank.

The KFTC has determined that these PDs allegedly shared key information — including interest rates, prices, and bidding volumes — ahead of government bond auctions and steered rates toward specific levels. PDs must meet minimum underwriting and bidding performance thresholds to maintain their status, and in this process, a so-called "goalpost setting" tactic was employed, where dealers submitted bids near the final awarded yield without actually wanting to win the bonds. The KFTC views this information sharing as a means for the dealers to avoid losses.

The industry's greatest concern is the scale of potential fines. According to the KFTC's investigation report, the financial firms' total revenue related to government bond bidding is estimated at 76.23 trillion won (approximately $51.5 billion). Applying the statutory penalty rate of 6.5% to 10.5% yields a fine calculation ranging from 4.96 trillion won to 8 trillion won (approximately $5.4 billion). Some financial investment industry sources project that if the awarded bond amount is used as the benchmark and the "very serious violation" penalty rate of 10.5% to under 15.0% is applied, fines could surge from 7.98 trillion won to as much as 11.4 trillion won (approximately $7.7 billion). This would exceed the previous record fine of 737 billion won imposed in the flour price-fixing case by up to 11 times.

The financial firms are contesting the very basis of the fine calculation. While the KFTC has treated the entire government bond underwriting or awarded amount as related revenue, the industry argues that "operating revenue" under the Monopoly Regulation and Fair Trade Act should be the standard. They contend that PD operations are largely public in nature — supporting the government's bond issuance — and generate modest actual profits, making it excessive to treat the entire underwriting amount as revenue. The securities industry is focusing its defense on reducing per-firm fines to below 10 billion won (approximately $6.8 million).

A fierce legal battle is also expected over whether collusion can be established. The financial firms counter that their actions differ fundamentally from classic bid-rigging aimed at securing unfair profits by fixing a specific awarded yield. They argue the activity was closer to information exchange to avoid losses from being saddled with unwanted bond allocations, and thus had limited anti-competitive effect. They further contend that given the market structure — where insurers, pension funds, and public funds participate in government bond auctions through PDs — independent collusion among PDs is virtually impossible, and the activity amounted to nothing more than a few dealers with personal connections sharing market outlooks in small groups. A key point of contention is whether a single agreement among all 15 firms can be recognized solely because information exchanged among some dealers was sequentially passed along.

Should massive fines materialize, significant shock is expected for the financial firms' soundness and the broader government bond market. Setting aside provisions for penalty payments would lower capital ratios, inevitably burdening the firms' ability to fulfill financial authorities' demands for venture capital supply and enhanced inclusive finance initiatives. One industry source noted, "If fines in the hundreds of billions or trillions of won emerge, defending capital ratios will become the top priority."

A larger concern is the potential disruption to the government bond primary market. Under South Korea's State Contract Act, entities found to have engaged in collusion may face restrictions on bidding eligibility. If the 15 PDs are barred from market participation, direct disruption to government bond issuance, budget financing, and fiscal execution would be unavoidable. With foreign investment inflows increasing following South Korea's inclusion in the World Government Bond Index (WGBI) this April, concerns are rising that turmoil in the government bond market could trigger broader adverse effects, including a decline in external credibility.

Reflecting these concerns, the Ministry of Economy and Finance has reportedly conveyed its position to the KFTC, requesting partial consideration of the financial firms' arguments in light of government bond market stability and the WGBI inclusion timeline. The postponement of the KFTC plenary session — originally expected in July — to August 19-20 is seen as reflecting this inter-agency coordination process. Meanwhile, the Financial Services Commission, while maintaining that the KFTC investigation's quasi-judicial nature and independence should be respected, has indicated it will convey industry and market difficulties through the inter-agency opinion solicitation process.

An investment banking industry source forecast, "Depending on the final fine amount, there could be considerable pressure on securities firms' earnings and government bond PD operations. While the KFTC has indicated it will deliberate according to principle, making the outcome difficult to predict, the entire government bond market could be shaken depending on the severity of sanctions."