Issuer Summary: KB Kookmin Bank

1. Credit View and Monitoring Focus

KB Kookmin Bank is the core operating bank of KB Financial Group and possesses one of the largest retail and commercial banking franchises in South Korea. The credit strength lies in its large domestic deposit base, diversified lending across households, mortgages, SMEs, and corporates, deep customer relationships in payments, foreign exchange, and wealth management, as well as a robust capital position. Unlike the holding company, KB Financial Group, KB Kookmin Bank is an operating bank with actual deposits and loans; for senior bank bond analysis, the focus should be on the bank’s standalone asset quality, capital, funding, and liquidity.

In conclusion, KB Kookmin Bank’s senior credit can be considered very strong within the South Korean banking sector. As of end-March 2026, standalone total assets were KRW 605.3 trillion, won-denominated loans KRW 379.0 trillion, and the loan-to-deposit ratio 97.9%, reflecting a sound funding structure for a deposit-led large bank. Capital is ample, with a common equity Tier 1 ratio of 14.88% and a BIS ratio of 17.04%, providing sufficient buffer for a major Korean bank.

Profitability is strong. Standalone net income was KRW 3.85 trillion in 2025, up from KRW 3.25 trillion in 2024, and KRW 1.10 trillion in Q1 2026. The standalone NIM was 1.74% for 2025 and 1.77% for Q1 2026, showing slight improvement despite margin pressures in the Korean banking sector. Net interest income was KRW 10.66 trillion in 2025 and KRW 2.77 trillion in Q1 2026, indicating a solid core earnings base.

However, credit assessment should not rely solely on the premise of being one of the largest and highest-rated banks in Korea. The standalone NPL ratio rose to 0.34% as of March 2026 from 0.28% at end-2025. NPL coverage declined from 206.0% at end-2025 to 168.5% at end-March 2026. Delinquency increased from 0.28% to 0.35% over the same period. Although absolute levels remain low, the vulnerabilities in household debt, SMEs, self-employed borrowers, and real estate-related sectors are beginning to manifest in asset quality.

For senior bond investors, the base case remains stable. KB Kookmin Bank benefits from a strong deposit base, ample capital, low NPL ratios, high ratings, and systemic importance in South Korea. Short-term increases in credit costs or NPLs are absorbable given current earnings and capital. Nevertheless, if asset quality deterioration persists across multiple quarters, with simultaneous rises in SME, SOHO, household, and real estate delinquencies, and CET1 ratios decline, a reassessment of its currently strong credit profile would be warranted.

Investors should distinguish between KB Kookmin Bank-issued bonds and KB Financial Group-issued bonds. KB Kookmin Bank is the operating bank with ratings of Moody’s Aa3, S&P A+, and Fitch A, higher than the holding company. Holding company bonds depend on dividends from subsidiaries and are structurally subordinated, whereas bank senior bonds access the bank’s balance sheet directly. Thus, even under the same KB name, senior bank bonds should be viewed as more direct and defensive credit.

2. Business Snapshot: What is KB Kookmin Bank?

KB Kookmin Bank is a wholly-owned subsidiary of KB Financial Group, serving as the core commercial bank responsible for domestic deposits and lending to individuals and corporates, including mortgages, household loans, SME and large corporate lending, FX, trade finance, payments, trust, guarantees, and wealth management services. While the group also operates securities, insurance, cards, and asset management businesses, standalone credit should be assessed primarily based on the bank’s deposits, lending, capital, and asset quality.

As of March 2026, standalone total assets were KRW 605.3 trillion, among the largest for major Korean commercial banks. Won-denominated loans totaled KRW 379.0 trillion, split between households (KRW 182.7 trillion) and corporates (KRW 196.4 trillion). Within corporates, SME loans amounted to KRW 151.4 trillion, reflecting deep exposure to Korea’s SMEs, self-employed, service, and real estate sectors.

KB Kookmin Bank’s strength lies not merely in scale. Retail customers are linked through deposits, payroll accounts, mortgages, cards, wealth management, and digital banking. Corporate clients engage across lending, deposits, payments, FX, trade finance, guarantees, and cash management. These relationships are sticky and not easily lost to short-term price competition. Credit quality is underpinned by this depth of customer engagement, translating into stable deposits and recurring earnings.

It is inappropriate to view the bank as a high-growth emerging-market or digital-only bank. KB Kookmin Bank is a large, deposit-led commercial bank operating within a mature Korean economy. Credit assessment hinges less on growth and more on how well deposits, capital, and asset quality are preserved in weak economic cycles. For senior bond investors, conservative portfolio management and sufficient capital are more critical than flashy earnings growth.

The group relationship also matters. KB Financial Group is a holding company, and KB Kookmin Bank is its core bank. Non-bank subsidiaries diversify group earnings, but repayment capacity for bank bonds depends primarily on the bank’s own capital, liquidity, deposits, and asset quality. Group reputation, capital policy, shareholder returns, and support to non-bank subsidiaries may indirectly affect the bank, but as an issuer, KB Kookmin Bank’s structure is simpler and more transparent than the holding company.

Overseas operations are secondary. KB Group has subsidiaries in China, Myanmar, Cambodia, and Indonesia, but the bank’s standalone credit is driven by its domestic franchise. While overseas exposure offers growth opportunities, it introduces regulatory, FX, credit cycle, and contingent support risks. This summary focuses on the bank’s domestic deposits, lending, and capital.

3. What Changed Recently

The key recent development is that, while earnings and capital remain strong, asset quality shows some signs of deterioration. Standalone net income for Q1 2026 was KRW 1.101 trillion, up from KRW 0.488 trillion in Q4 2025. Although quarterly profits are influenced by seasonality and one-offs, the full-year 2025 net income of KRW 3.852 trillion and Q1 2026 net income indicate strong underlying earnings power.

Net interest income remains solid, increasing from KRW 9.87 trillion in 2023 to KRW 10.22 trillion in 2024 and KRW 10.66 trillion in 2025, with KRW 2.77 trillion in Q1 2026. Standalone NIM was 1.78% in 2024, 1.74% in 2025, and slightly recovered to 1.77% in Q1 2026, resilient amid Korea’s rate cuts and competitive pressures.

On capital, standalone CET1 was 14.91% at end-2025 and 14.88% at end-March 2026, remaining high. BIS ratio decreased slightly to 17.04% from 17.28% but remains strong, providing sufficient buffer amid loan growth, RWA fluctuations, dividends, and group capital policies.

Asset quality warrants attention. Standalone NPL ratio rose to 0.34% in March 2026 from 0.28% at end-2025. NPL coverage declined from 206.0% to 168.5%, and delinquency increased to 0.35%. Absolute levels are low, but the deterioration signals warrant monitoring.

Lending composition shifted slightly. Household loans decreased to KRW 182.7 trillion from KRW 183.4 trillion, while corporate loans rose from KRW 194.1 trillion to KRW 196.4 trillion; SME loans increased from KRW 149.7 trillion to KRW 151.4 trillion. The recent growth in corporate and SME lending may support earnings but also raises sensitivity to stress in these segments.

Credit interpretation of this change is that the franchise remains robust, with the bank operating within a normal Korean credit cycle. Strong NIM, net income, and capital maintain the senior bond base case. However, rising NPLs, delinquencies, and falling coverage indicate the need to monitor asset quality in coming quarters.

4. Industry Position and Franchise Strength

KB Kookmin Bank is among South Korea’s major commercial banks alongside Shinhan Bank, Hana Bank, and Woori Bank, with particularly strong retail and mortgage franchises and customer relationships. The mature Korean banking market prioritizes deposit depth, mortgage volumes, SME and digital channels, wealth management, and corporate client relationships. KB Kookmin Bank ranks highly on scale, brand, customer base, and capital.

Compared to peers, it has stronger earnings and capital than Woori Bank, and KB Financial Group’s non-bank businesses add revenue diversification. However, for standalone bank credit, non-bank diversification does not directly provide repayment. For senior bond investors, the key is KB Kookmin Bank’s large deposit base, capital, and deep integration in domestic household and corporate finance.

Franchise strength is reflected in loan-to-deposit ratios: 98.8% at end-2023, 98.8% at end-2024, 98.1% at end-2025, and 97.9% at end-March 2026, staying below 100%. This indicates lending is supported by deposits, not excessively ahead of funding. Large Korean banks can access market funding, but deposit-backed lending remains critical; KB Kookmin Bank is strong in this respect.

The bank’s strength is not retail-biased. As of March 2026, won-denominated loans were 51.8% corporate and 48.2% household, maintaining balance. Within corporates, large corporate loans amount to KRW 44.9 trillion alongside substantial SME exposure, indicating a diversified client base across sectors. It is a universal commercial bank, not dependent on a single segment.

However, franchise strength does not eliminate macro sensitivity. High household debt and real estate exposure mean asset quality is influenced by property prices, interest rates, and employment. SME/SOHO lending is sensitive to domestic demand, construction, real estate, services, and export cycles. KB Kookmin Bank can absorb stress due to its strength, but macro deterioration affects it as well.

Thus, franchise assessment should balance “large size provides confidence” with “exposure to Korean macro risks.” KB Kookmin Bank is affected by macro conditions but is relatively shielded via deposits, capital, customer base, ratings, and market access, which underpins senior bond credit evaluation.

5. Segment Assessment

Household lending is a key earnings driver. Won-denominated household loans were KRW 182.7 trillion at March 2026, 48.2% of total loans. Residential mortgages are KRW 112.9 trillion, central to household lending. Mortgages are collateralized, typically yielding lower loss rates than unsecured consumer loans. However, exposure to household debt and housing prices means declining property values, employment deterioration, and rising rates could impact asset quality with a lag.

Household delinquency was 0.28% versus 0.40% for corporates at March 2026, reflecting collateral and regulatory effects. Despite low rates, the large volume means small changes affect NPL amounts and market perception. Assessment should consider housing prices, DSR regulation, employment, income, and refinancing alongside NPLs.

Corporate loans totaled KRW 196.4 trillion, exceeding household loans. SME lending is KRW 151.4 trillion and SOHO KRW 94.4 trillion. SMEs support employment and domestic demand but are sensitive to economic slowdown, high rates, and real estate/construction weakness. SME delinquency rose to 0.44% from 0.39%, a key monitoring point.

Large corporate loans were KRW 44.9 trillion. While smaller in volume than SME loans, single exposures can have significant impact. Delinquency increased to 0.32% from 0.03%. Such figures can be affected by one-off events; analysis should focus on whether delinquencies are transient or spreading across sectors.

Net fee income is a supplementary earnings source, at KRW 1.20 trillion in 2025 and KRW 0.373 trillion in Q1 2026, improving since 2024. Wealth management, remittances, FX, trust, investment product sales, and payment-related fees support profits when NIM is pressured. Core bank credit remains driven by net interest income and loans; fees are complementary.

Foreign currency and international operations are an unavoidable consideration. As a bank serving Korean companies’ trade and overseas activities, FX deposits, loans, corporate bonds, cross-border payments, and FX exposures exist. Detailed FX LCRs and maturity gaps are not shown here, but global market stress affects Korean bank spreads. KB Kookmin Bank’s high ratings and market access are supportive, but USD funding, KRW depreciation, and overseas subsidiary risks should be monitored.

6. Financial Profile

KB Kookmin Bank’s financial profile can be summarized as strong earnings, capital, and deposit base, with asset quality good in absolute terms but showing recent slight deterioration. The latest official disclosures are the KB Financial Group Q1 2026 results and Fact Book. The table below uses bank standalone data from the 2026 Q1 Fact Book and FY2025 Fact Book.

Earnings are strong. Net income improved to KRW 3.85 trillion in 2025 and Q1 2026 net income of KRW 1.10 trillion remains high. Net interest income was KRW 10.66 trillion in 2025 and KRW 2.77 trillion in Q1 2026, indicating a solid core earnings base.

NIM declined to 1.74% in 2025 but recovered slightly to 1.77% in Q1 2026. Given rate cuts and deposit competition, pressure on NIM may persist. However, a large deposit base and balanced loan composition limit sharp margin deterioration.

Capital is strong. CET1 was stable around 14.88–14.91%, BIS ratio remains in the 17% range, providing sufficient buffer for rising credit costs or RWA growth, supporting senior bond investors.

Asset quality remains good in absolute terms. NPLs of 0.34% and delinquency of 0.35% are not crisis-level, though recent increases and falling coverage warrant monitoring, particularly for SME, SOHO, construction, real estate, and self-employed exposures.

On funding, the loan-to-deposit ratio below 100% indicates deposits support lending. While low-cost deposit ratios are not shown, the retail franchise suggests strong deposit-raising capacity. Market funding is supplementary; deposits remain the foundation.

Overall, KB Kookmin Bank can be characterized as a large commercial bank with strong earnings and capital but where asset quality trends should be monitored. Senior bonds can be viewed stably, while subordinated instruments require closer attention to capital ratios, credit costs, NPL coverage, and regulatory loss absorption clauses.

7. Structural Considerations for Bondholders

The most important structural consideration for bond investors is to distinguish between bonds issued by KB Kookmin Bank and those issued by KB Financial Group. KB Kookmin Bank is an operating bank, with deposits, loans, payments, capital, and liquidity directly on its balance sheet. KB Financial Group, by contrast, is a holding company and depends on dividends and capital movements from subsidiaries. Senior bank bonds are more directly linked to the repayment capacity of the bank itself than holding company bonds.

Official ratings also reflect this distinction. KB Kookmin Bank’s long-term ratings are Moody’s Aa3, S&P A+, and Fitch A. By contrast, KB Financial Group’s long-term ratings are Moody’s A1 and S&P A, lower than those of the bank itself. This is because the bank benefits from its deposit base, regulatory supervision, systemic importance, and priority as an operating bank, while the holding company is subject to structural subordination.

The bank’s liability hierarchy should also be differentiated. Deposits, senior unsecured bonds, covered bonds, subordinated bonds, Tier 2, and AT1 instruments differ in loss-absorption ranking, regulatory treatment, and support expectations. The strength of KB Kookmin Bank as an issuer is a major support for senior bonds. However, for Tier 2 and AT1, investors must review instrument-specific terms such as non-viability, write-down, coupon cancellation, non-call risk, and regulatory discretion.

South Korea’s bank regulatory environment imposes strong supervision over capital, liquidity, and foreign-currency liquidity for major banks. This is positive for senior bond investors. The systemic importance of large banks reduces the risk of a sudden liquidity crisis or loss of market access. For subordinated capital investors, however, it also means that loss absorption may be required under stress. It is important not to conflate regulatory protection with regulatory loss absorption.

Investors should also consider, as a secondary issue, how risks from non-bank subsidiaries within the group could spill over to the bank. KB Kookmin Bank is the group’s core bank and is directly protected by its own capital. However, if capital needs arise at the holding company level for securities, insurance, card, or overseas subsidiaries, the bank could be indirectly affected through dividend policy or group capital allocation. This is not the main issue for senior bonds, but it cannot be ignored when assessing long-term capital management.

Accordingly, KB Kookmin Bank’s senior bank bonds are among the clearest and most defensive risks within the KB group. They rely more directly on the bank’s deposits, capital, and asset quality than holding company bonds or subordinated capital instruments. At the same time, investors should not treat all KB-name bonds as the same risk without checking instrument terms, issuer, currency, ranking, and the presence or absence of regulatory loss-absorption features.

8. Capital Structure, Liquidity and Funding

Capital is the most important factor supporting KB Kookmin Bank’s credit strength. As of end-March 2026, the bank’s standalone CET1 ratio was 14.88% and its BIS ratio was 17.04%, which are very strong for a major Korean bank. These ratios declined only slightly from end-2025, and the bank retains ample capacity to absorb ordinary increases in credit costs or RWA growth. For senior bond investors, capital shortfall is not a key issue at present.

This capital strength is not merely a regulatory ratio; it also provides management flexibility. A well-capitalized bank has less need to increase higher-yielding assets aggressively during a weak economy. Even if credit costs rise, it has room to build provisions while protecting the lending franchise. In KB Kookmin Bank’s case, a CET1 ratio in the high-14% range is positive because it makes it easier for management to maintain a defensive stance under stress.

Funding is deposit-led. As of end-March 2026, the loan-to-deposit ratio for won-denominated loans was 97.9%, slightly down from 98.1% at end-2025. This indicates that loan growth has not run excessively ahead of deposit funding. As a large bank, KB Kookmin Bank also uses market funding and foreign-currency funding, but its basic structure is deposit-led. For a commercial bank credit, this deposit-gathering capability is the most important line of defence.

On liquidity, this report does not include detailed time-series data for LCR / NSFR / foreign-currency LCR from the Fact Book. However, KB Kookmin Bank is a highly rated large bank with a domestic deposit base and market access, so short-term liquidity concern is not a central issue. The areas to confirm are instead foreign-currency liquidity, foreign-currency maturity gaps, and foreign-currency funding costs under KRW depreciation. For Korean bank credit, foreign-currency market stress can affect spreads relatively quickly.

A key point in capital and liquidity analysis is the relationship between standalone bank strength and group capital policy. KB Financial Group emphasizes shareholder returns, and the group CET1 ratio is also high. The bank’s standalone capital is ample, but investors should monitor how dividends from the bank and group capital allocation evolve as the holding company pursues shareholder returns and non-bank growth. This is not a credit constraint at present, but over the long term, investors should assess how much standalone capital flexibility is preserved at the bank.

For senior bond investors, the key point is that KB Kookmin Bank has capital, deposits, and market access simultaneously. A decline in NIM or an increase in credit costs alone should be absorbable through current capital and earnings. However, if deterioration in household, SME, and real estate-related assets, foreign-currency market stress, and a decline in CET1 occur at the same time, the currently stable credit view would need to be reassessed.

9. Rating Agency View

According to KB Financial Group’s official ratings page, KB Kookmin Bank’s long-term ratings are Moody’s Aa3 / Stable, S&P A+ / Stable, and Fitch A / Stable. Its short-term ratings are Moody’s P-1, S&P A-1, and Fitch F1. This is a very strong rating position within the Korean banking sector and reflects the bank’s deposit base, capital, earnings capacity, and systemic importance.

The implication of the ratings is that KB Kookmin Bank is a very strong bank on a standalone basis, but its credit profile is not fully independent of the Korean sovereign and banking system framework. Korea’s household debt, real estate, corporate credit cycle, exchange rate, foreign-currency liquidity, and bank regulation affect the ceiling and stability of the ratings. Support expectations as a major bank are a credit positive, but bank bonds should not be equated with direct obligations of the Korean government.

The rating differential between KB Kookmin Bank and KB Financial Group is important. The bank itself is rated Moody’s Aa3, S&P A+, and Fitch A, which is higher than the holding company’s Moody’s A1 and S&P A ratings. This is because the bank is an operating bank and directly holds deposits, regulatory supervision, assets, and capital. Investors should not rely solely on the KB brand name; they should confirm whether the issuer is the bank or the holding company.

The rating agency view is broadly consistent with the credit assessment in this report. KB Kookmin Bank is a highly rated bank supported by high capital ratios, a strong deposit base, low NPL ratios, and systemic importance within the Korean banking system. At the same time, the recent rise in NPL and delinquency ratios, sensitivity to Korean household debt and SME stress, and the potential impact of foreign-currency liquidity and real estate-related risks on market sentiment constrain upside.

Key rating monitoring points are whether the standalone CET1 ratio can remain in the 14% range, whether increases in NPL and delinquency ratios are temporary, whether NPL coverage thickens again, whether credit costs are sufficiently absorbed by earnings, and whether foreign-currency liquidity remains adequate under stress. Senior ratings are viewed as stable, but subordinated capital instruments can experience significant price volatility even when ratings are stable, due to capital ratios, regulatory terms, and call expectations.

10. Credit Positioning

Within Asian investment-grade banks, KB Kookmin Bank is a core name for gaining exposure to major Korean banks. It is a large commercial bank in a mature market, where the investment theme is stability supported by deposits, capital, regulatory oversight, and systemic importance rather than high growth. In senior bonds, it offers exposure to Korean bank risk while providing relatively high-quality operating bank credit.

Compared with peers, KB Kookmin Bank has stronger profitability and capital than Woori Bank, and its standalone bank ratings are higher. On the other hand, KB Kookmin Bank has large exposures to households, mortgages, and SMEs, and cannot avoid the impact of Korean macro conditions. A precise relative-value comparison with Shinhan Bank or Hana Bank requires live spreads and detailed metrics and is outside the scope of this report, but fundamentally, KB Kookmin Bank can be viewed as a top-tier credit within the Korean banking sector.

From a portfolio perspective, KB Kookmin Bank should be held not as a “quasi-sovereign risk-free asset,” but as an “A-category bank taking Korean banking-cycle risk, defended by strong capital and deposits.” It is not suitable for investors seeking to avoid Korean macro risk. However, for investors in Asian investment-grade financials who prioritize institutional stability, liquidity, ratings, and commercial banking franchise strength, it is a core candidate.

Even within the same KB group, KB Kookmin Bank senior bonds are more defensive than holding company bonds. Holding company bonds require consideration of structural subordination and group capital policy, whereas senior bank bonds rely directly on the bank’s deposits, capital, and asset quality. In relative value analysis, investors should check whether the spread differential sufficiently compensates for this structural difference.

For subordinated capital instruments, the investment logic changes even for the same issuer. In senior bonds, issuer stability is the main support. In Tier 2 and AT1, pricing is driven by capital ratios, regulatory loss absorption, coupon cancellation, non-call risk, liquidity, and changes in the investor base. KB Kookmin Bank’s credit quality is strong, but subordinated capital instruments should not be treated as extensions of senior bonds.

11. Key Credit Strengths and Constraints

The credit strengths are clear. First, KB Kookmin Bank has one of Korea’s largest retail and commercial banking franchises. Second, it has ample capital, with a standalone CET1 ratio of 14.88% and a BIS ratio of 17.04%. Third, it has strong net income of KRW 3.85 trillion in 2025 and KRW 1.10 trillion in Q1 2026. Fourth, it has a deposit-led funding base, as reflected in a loan-to-deposit ratio of 97.9%. Fifth, it has high international ratings of Moody’s Aa3, S&P A+, and Fitch A, and systemic importance in the Korean financial system.

The constraints are equally important. First, the bank is sensitive to Korean household debt, housing prices, SMEs, self-employed borrowers, and real estate-related sectors. Second, the standalone NPL and delinquency ratios rose in Q1 2026, while NPL coverage declined. Third, NIM declined from 2023 to 2025, leaving medium-term margin pressure. Fourth, foreign-currency liquidity and KRW depreciation are less visible in normal times but become important under market stress. Fifth, subordinated capital instruments carry regulatory loss-absorption risk.

Taken together, these strengths and constraints characterize KB Kookmin Bank as “a very strong bank, but one where Korean macro and asset quality trends should continue to be monitored.” For senior bond investors, capital, deposits, ratings, and earnings capacity provide sufficient support. At the same time, investors should not be overly reassured by the low NPL ratio, and should follow the direction of delinquencies and coverage.

The most important issue at present is whether the asset-quality deterioration seen in Q1 2026 is temporary or the beginning of stress in Korean SMEs and households. Based on current data, there is no need to materially revise the credit view. Capital and earnings are sufficiently strong, so the base case remains stable. However, if the NPL ratio, delinquency ratio, SME delinquency ratio, and credit costs deteriorate simultaneously over multiple quarters, spreads are more likely to be reassessed.

In one sentence, KB Kookmin Bank is “an operating bank with top-tier defensive strength within the Korean banking sector, but an issuer for which household, SME, and foreign-currency liquidity risks should continue to be monitored.” This does not mean the bank is weak. Rather, because it is a strong issuer, small deteriorations may be priced into the market with a lag, making early monitoring important.

12. Downside Scenarios and Monitoring Triggers

The most realistic downside scenario is gradual deterioration in asset quality centered on SME and SOHO exposures. KB Kookmin Bank’s won-denominated SME loans were KRW 151.4 trillion as of end-March 2026, and SOHO loans were KRW 94.4 trillion. The SME delinquency rate rose from 0.39% at end-2025 to 0.44% at end-March 2026. It remains low, but if weakness in Korean domestic demand, construction, real estate-related services, and self-employed borrowers persists, this area is likely to deteriorate first.

The second downside is deterioration in household debt and housing prices. Mortgages were KRW 112.9 trillion as of end-March 2026 and are the core of household lending. If a decline in housing prices, employment deterioration, renewed interest-rate increases, and a weaker refinancing environment occur together, household delinquency and NPL ratios could rise with a lag. Collateralized mortgages should keep loss rates contained, but the size of the loan book means the impact on market sentiment cannot be ignored.

The third downside is a combination of declining NIM and rising credit costs. If NIM declines while credit costs remain low, earnings can absorb the pressure. Conversely, if credit costs increase simultaneously across SMEs, households, and large corporates while NIM is weak, the bank’s earnings resilience will be tested. At present, credit loss provisions in Q1 2026 were KRW 172.0 billion, lower than in Q4 2025, but investors should not take comfort from quarterly fluctuations alone.

The fourth downside is stress in foreign-currency liquidity and market funding. Major Korean banks are involved in foreign-currency funding and trade finance, so when USD funding-market stress, KRW depreciation, and overseas investors’ risk aversion toward Korea occur simultaneously, foreign-currency funding costs and spreads tend to rise. KB Kookmin Bank has high ratings and strong market access, but foreign-currency LCR, maturity gaps, and the foreign-currency bond redemption schedule should be reviewed in future updates.

The fifth downside is spillover from group capital policy. As KB Financial Group pursues shareholder returns and non-bank growth, it is important to assess how standalone bank capital flexibility is maintained. As long as the bank’s standalone CET1 remains in the high-14% range, concern for senior bonds should be limited. However, if asset-quality deterioration overlaps with group-level capital needs and the bank’s standalone CET1 ratio declines clearly, the current stable view would need to be reassessed.

Future monitoring items include standalone bank NIM, net income, net interest income, credit loss provisions, NPL ratio, NPL coverage, delinquency ratio, SME delinquency ratio, SOHO loans, mortgage balance, loan-to-deposit ratio, CET1 ratio, BIS ratio, foreign-currency LCR, NSFR, foreign-currency maturity gaps, rating outlooks, and the liability ranking and non-viability terms of individual bonds. The base case is stable, but if multiple indicators deteriorate simultaneously, even senior bonds are more likely to face spread reassessment.

In terms of monitoring sequence, investors should look first at delinquency rates, then at the NPL ratio and coverage, then at credit costs and net income, and finally at the CET1 ratio and rating tone. For strong banks, early deterioration often appears not in capital ratios but in small increases in delinquencies or NPLs. KB Kookmin Bank has ample capital and can absorb one-off deterioration. However, if small deteriorations persist for several quarters, investors are likely to become more cautious.

Ultimately, a major change in the credit view on KB Kookmin Bank would not be driven by a standalone rise in NPLs, but by a simultaneous weakening of multiple lines of defence. Specifically, this would involve a chain of events in which SME, household, and large corporate delinquencies all rise, NPL coverage declines further, NIM falls, credit costs increase, the CET1 ratio declines, and foreign-currency funding costs also rise. The bank is currently far from that scenario, and senior credit is therefore viewed as stable. Nevertheless, the Q1 2026 asset-quality indicators require ongoing periodic monitoring.

13. Short Summary & Conclusion

KB Kookmin Bank is the core bank of KB Financial Group and a major Korean commercial bank with broad responsibility for deposits, lending, and payments. It is a very strong investment-grade bank credit supported by a large asset base, strong franchise, and ample CET1 and BIS capital ratios. The direction is stable, but investors are now at a stage where delinquencies, coverage, and credit costs should be monitored behind the low NPL ratio. Investors should focus on whether deterioration in households, SME/SOHO, and real estate-related exposures feeds through to NPLs and CET1.

14. Sources

Key sources confirmed:

• KB Financial Group, 2026 1st Quarter Earnings Release, published April 23, 2026
• KB Financial Group, 2026 1st Quarter Fact Book, accessed May 7, 2026
• KB Financial Group, FY2025 Earnings Release, published February 2026
• KB Financial Group, 2025 Fact Book, accessed May 7, 2026
• KB Financial Group, Overview page, accessed May 7, 2026
• KB Financial Group, Our Business / Network page, accessed May 7, 2026
• KB Financial Group, Credit Ratings page, accessed May 7, 2026

Unconfirmed items or items requiring additional verification:

• Contractual terms, non-viability clauses, write-down clauses, call terms, and subordination for each individual bond
• Detailed LCR / NSFR / foreign-currency liquidity time series for KB Kookmin Bank
• Detailed time series for low-cost deposits and core deposits
• Foreign-currency bond maturity profile, funding by currency, and foreign-currency maturity gaps
• Strict standalone bank comparison with Shinhan Bank, Hana Bank, and Woori Bank, and live spread / CDS / bond relative value