Advanced Info Service Issuer Summary

Report date: 2026-05-13
Issuer: Advanced Info Service Public Company Limited
Ticker reference: ADVANC TB
Relevant debt reference: AIS / Advanced Wireless Network domestic debentures and AIS US dollar notes due 2031 / 2036

1. Business Snapshot and Recent Developments

Advanced Info Service Public Company Limited (“AIS”) is one of Thailand’s leading integrated telecommunications operators. Its core businesses are mobile communications, fixed broadband, enterprise communications and digital services, handset sales and retail, and digital services including video, gaming, and finance-related services. For credit analysis, AIS should be viewed not simply as a mobile operator, but as a listed telecom issuer that simultaneously has exposure to domestic telecommunications infrastructure in Thailand, spectrum, broadband integration, and adjacent growth investments such as data centers, cloud, and virtual banking.

As of 2026-05-13, the latest full-year results that can be confirmed are for the fiscal year ended December 2025, and the latest quarterly results are for 1Q2026. For full-year 2025, total revenue was Bt226,264mn, EBITDA was Bt123,270mn, and net profit was Bt47,886mn. The company described 2025 core service revenue as Bt173,316mn, up 6.7% year on year, with continued demand across mobile, fixed broadband, and enterprise services. In 1Q2026, core service revenue was also up 7.0% year on year to Bt44,849mn, with mobile revenue of Bt34,005mn, fixed broadband revenue of Bt8,511mn, and enterprise revenue of Bt1,853mn.

In one sentence, AIS is an issuer that captures both the “volume” and “quality” of Thailand’s telecommunications demand. In mobile, subscribers reached 46.9mn at end-March 2026, including 18.5mn 5G subscribers, meaning 5G subscribers accounted for 39% of the total. In fixed broadband, subscribers were 5.3mn, and integration of Triple T Broadband Public Company Limited (“TTTBB”) and the 3BB brand acquired in 2023 is progressing. These metrics do not merely mean that the customer base is large. A telecom company’s credit quality is determined by the combination of subscribers, ARPU, churn, network quality, capital expenditure, and spectrum costs. AIS has scale, but it is also an issuer with substantial fixed burdens required to maintain that scale.

The most important recent event was AIS’s issuance of its first offshore US dollar bonds on 2026-03-04. The total issue size was USD1bn, consisting of USD600mn due 2031 with a 4.260% coupon and USD400mn due 2036 with a 4.894% coupon. The bonds are listed on the SGX-ST, and the issuer is AIS itself. The company explains that the proceeds will be used for general corporate purposes and that the debt burden has been converted into Thai baht through cross-currency swaps. This means that, in addition to its traditional reliance on domestic debenture funding, AIS has gained access to international bond markets. From a credit perspective, this is positive as funding-source diversification. However, for foreign-currency bond investors, it also makes it necessary to examine not only domestic ratings but also Thailand’s country, currency, and legal-system risks, offshore bond covenants, and the repayment resources of the issuer itself.

Another major change is the large shareholder structure. On 2025-04-01, the merger of Intouch Holdings Public Company Limited and Gulf Energy Development Public Company Limited resulted in the establishment of Gulf Development Public Company Limited (“GULF”), and the 40.44% stake in AIS previously held by Intouch came to be held by GULF. According to AIS IR as of 2026-03-02, GULF held 40.44%, Singtel Strategic Investments Pte Ltd. held 19.10%, and Singtel-related interests held through Raffle Nominees accounted for 5.67%. GULF and Singtel are both important large shareholders, but this should not be treated as equivalent to debt guarantees or government support. In credit analysis, control and influence, related-party transactions, capital policy, data-center joint ventures, protection of external minority shareholders, and change-of-control provisions in bond documentation should be analyzed separately.

On the business side, important developments in 2025-2026 include mobile ARPU improvement, fixed broadband integration of 3BB, enterprise demand for data centers and cloud, the acquisition of 2100MHz spectrum in 2025, and support for GSA Data Center 02 (“GSA02”) in 2026. AIS won 2x15MHz of 2100MHz spectrum on 2025-06-29 and obtained a 15-year license. In February 2026, AIS DC Venture, an AIS subsidiary, resolved to provide Bt910.25mn of support to GSA02. GSA02 is a data-center project under GSA Holdings, a joint venture owned 25% by AIS, 40% by GULF, and 35% by Singtel. According to the 1Q2026 MD&A, GSA02 will have 38MW of capacity and is scheduled to start operations in 2027.

These events make AIS’s credit profile somewhat more complex. Its core business is telecommunications, and its revenue and cash flow are strong. At the same time, the telecom business cannot avoid spectrum and network investment, and adjacent investments are also increasing, including fixed broadband integration, data centers, virtual banking, content, and IT modernization. AIS is therefore not a simple mature telecom cash cow, but an issuer that is using a strong domestic telecom foundation to expand investment into adjacent areas. For bondholders, the question is not whether the growth investments themselves are good or bad, but whether AIS can pursue them while simultaneously absorbing operating cash flow needs, dividends, spectrum payments, leases, short-term debt, and US dollar bonds.

2. Industry Position and Franchise Strength

AIS’s business foundation is supported by the competitive environment in Thailand’s telecom market after consolidation into two major players. Following the merger of TRUE and DTAC, the mobile market has effectively become centered on two major players, AIS and TRUE. A two-player structure tends to increase the scope for ARPU improvement and recovery of network investments, but it does not eliminate competitive risk. In mobile, fixed broadband, content, enterprise communications, and data centers, competition continues in customer acquisition, bundling, pricing, and capital investment.

AIS has a large mobile base. On the What We Do page of AIS IR, the company states that as of 4Q2025 it had 46.7mn mobile subscribers, 50% subscriber market share, 51% revenue market share, 17.8mn 5G subscribers, a 38% 5G subscriber ratio, and population coverage of more than 95%. In 1Q2026, mobile subscribers increased to 46.9mn and 5G subscribers increased to 18.5mn. The mobile business is the core of AIS’s earnings, with 2025 mobile service revenue of Bt130,926mn and 1Q2026 mobile revenue of Bt34,005mn.

The credit value of the mobile business lies not only in subscriber numbers, but also in ARPU improvement. Blended ARPU in 1Q2026 was Bt238, up 4.2% year on year. Prepaid ARPU increased 8.5% year on year, supported by higher data usage, migration to higher-tier plans, and cross-selling of content. As 5G subscribers increase, this can feed into higher data usage, higher-tier plans, handset sales, and content sales. This improves revenue quality, but also requires capital expenditure to maintain and expand 5G network capacity.

In fixed broadband, AIS’s position after the integration of 3BB is important. AIS completed the acquisition of TTTBB and a 19% stake in JASIF, now 3BBIF, on 2023-11-15. The Annual Report 2025 explains that this transaction gave AIS a leading position in fixed broadband, with 4.7mn subscribers and network access to more than 13mn households. Fixed broadband revenue was Bt32,255mn in 2025 and Bt8,511mn in 1Q2026, while subscribers reached 5.3mn at end-March 2026 and FBB ARPU was Bt538.

Fixed broadband has credit characteristics that differ from mobile. Whereas mobile centers on spectrum, base stations, handsets, and mobile data usage, fixed broadband depends on household-level connections, installation and maintenance, fiber networks, content, and churn management. The integration of 3BB has increased scale, but customer migration, brand integration, systems integration, service quality, the relationship with 3BBIF, and competition with TRUE Online need to be monitored continuously. The company says it will advance integration toward one-operation, one-organization in 2026, and delays in integration could affect both cost reduction and customer satisfaction.

The enterprise business is still small in revenue terms, but it is relevant to AIS’s future revenue diversification. Enterprise service revenue was Bt7,828mn in 2025 and Bt1,853mn in 1Q2026. In 1Q2026, it increased 1.7% year on year but declined 8.2% quarter on quarter, which the company attributed to cautious corporate IT spending. Enterprise offerings include Enterprise Data Services, cloud, data centers, 5G private networks, cybersecurity, and ICT solutions. From a credit perspective, these businesses may supplement the mature mobile revenue of a telecom company, but they also tend to be project-based and investment-led, and may pressure EBITDA in the early stages.

Another feature of Thailand’s telecom industry is regulation and spectrum. Telecom companies use frequencies by obtaining licenses, and when license periods end, they are exposed to re-auctions or reallocation. AIS has a broad spectrum portfolio including 700MHz, 900MHz, 1800MHz, 2100MHz, 2600MHz, and 26GHz. The Annual Report 2025 states that AIS holds a total of 1,460MHz of spectrum, with low-band spectrum used for broad coverage, mid-band for urban capacity, and high-band for industrial applications. A broad spectrum portfolio is a source of service quality, but acquisition costs, payment schedules, amortization expenses, and regulatory conditions become fixed burdens.

The competitive environment currently appears favorable to AIS. ARPU is improving, mobile and fixed broadband revenue are growing, and 5G subscribers are increasing. However, when competition reignites in telecom markets, ARPU, handset subsidies, content costs, promotional expenses, channel commissions, and capital expenditure can deteriorate at the same time. In particular, if TRUE intensifies its offensive in fixed broadband or bundling, AIS may increase price incentives, content offerings, and network investment to retain subscribers. AIS’s industry position therefore supports its credit quality, but the more natural interpretation is not that competitive risk is low; rather, it is currently manageable.

3. Segment Assessment

Looking at AIS’s segments, the core of its credit quality is mobile, with fixed broadband now becoming the second pillar. Enterprise, retail, and digital services offer revenue diversification and future potential, but they are not currently the main determinants of debt repayment capacity. For bondholders, the important issue is not only whether each business is growing revenue, but also how each affects EBITDA, operating cash flow, capital expenditure, working capital, and fixed burdens.

The mobile business is the core of AIS’s credit quality. Mobile subscribers in 1Q2026 were 46.9mn, supported by postpaid net additions. From a credit perspective, the postpaid mix, 5G subscribers, ARPU, and churn improvement are more important than the total number of subscribers. 5G subscribers of 18.5mn and data usage of 35.4GB/data subscriber/month support migration to higher-tier plans, but also require capacity investment. AIS expects 2026 CAPEX, excluding spectrum, of Bt30-35bn, with 55-60% planned to be allocated to mobile.

The fixed broadband business became the second pillar after 3BB integration. In 1Q2026, FBB subscribers were 5.3mn and FBB ARPU was Bt538, and the business can be used for bundling with mobile, cross-selling, and churn prevention. At the same time, the integration of TTTBB/3BB customers, networks, systems, stores, and maintenance operations, the relationship with 3BBIF, and competition with TRUE Online remain. FBB should be assessed not only by subscriber growth, but also by network utilization efficiency, maintenance costs, churn, ARPU, and content costs.

The enterprise business has both future diversification potential and current volatility. Enterprise revenue grew 11% year on year in 2025, but declined quarter on quarter in 1Q2026. Cloud, data centers, cybersecurity, and 5G enterprise broaden the revenue base, but require project origination, personnel, facilities, and investment recovery. At this stage, the enterprise business should therefore be viewed as an option that can supplement the maturity of mobile and FBB.

Retail, digital services, data centers, cloud, and virtual banking expand customer touchpoints and future growth potential, but they are not the core of current debt repayment capacity. Handset sales lift revenue but are affected by margins, inventory, promotions, and handset cycles. For data centers, power, construction, utilization, customer contracts, and capital burden are important. For virtual banking, regulation, capital, credit risk, and the time needed to reach profitability are key issues.

Overall, the segment assessment of AIS is that mobile provides the stable revenue base, fixed broadband is the second pillar after integration, enterprise/data center/digital provides future diversification, and retail functions as a customer touchpoint. The credit strength lies in the scale and brand that allow these businesses to be operated in an integrated way. The constraint is that all of these businesses require investment in networks, IT, content, spectrum, data centers, and related areas, which can increase funding needs alongside dividends.

4. Financial Profile and Analysis

AIS’s financial profile is strong for an investment-grade telecom company. In both full-year 2025 and 1Q2026, revenue, EBITDA, and net profit increased, and interest-payment capacity was substantial. However, financial analysis of a telecom company should not place too much comfort on ordinary interest-bearing debt alone. Spectrum license obligations, lease liabilities, short-term debt, dividends, capital expenditure, and content and IT investments need to be considered together.

“Not obtained” in this table indicates that segment revenue, leverage, and interest coverage under the same definitions could not be fully collected at the time of initial preparation. The conclusion is based mainly on the company MD&A for full-year 2025 and 1Q2026, the Annual Report, and 1Q2026 materials. Total revenue, EBITDA, net profit, OCF, and FCF for 2023-2024 can be used to confirm trends, but given comparability after 3BB integration and changes in company definitions, credit judgment should center on 2025 and thereafter.

Full-year 2025 performance was not merely a year of higher revenue; it was also a year in which margins and finance costs were well managed. Total revenue increased 5.9% year on year, EBITDA increased 8.6%, and net profit increased 37.0%. The company explains that the increase in 2025 net profit reflected operating improvement and finance cost management, as well as one-off tax-related items. Therefore, not all of the increase in 2025 net profit should be read as structural credit improvement. For credit judgment, it is preferable to focus on EBITDA, operating cash flow, FCF, and leverage.

The revenue base was also strong in 1Q2026. Total revenue was Bt58,197mn, up 3.4% year on year; core service revenue rose 7.0%; EBITDA rose 7.1%; and net profit increased 28%. EBITDA margin was 55.3%, improving from 53.4% in the same period of the prior year. On the cost side, lower depreciation and network costs following the termination of the 2100MHz NT agreement, lower FT rates, and integration effects contributed. This is positive for credit, but some of it reflects the timing effects of contract termination and depreciation, and the same pace of improvement should not be assumed every year.

Cash flow is substantial. Operating cash flow was Bt120,810mn in 2025 and FCF was Bt57,494mn. In 1Q2026, operating cash flow was Bt30,744mn and FCF was Bt14,238mn. However, cash in 1Q2026 increased significantly to Bt68,094mn, possibly including funds from the US dollar bond issuance and cash set aside for dividend payments. Liquidity should not be overestimated solely by looking at the cash balance. Liquidity assessment needs to consider cash, short-term debt, dividends, spectrum payments, debenture repayments in 9M2026, and capital expenditure together.

Leverage is low, but definitional differences are important. Net debt / EBITDA excluding lease liabilities and spectrum license obligations was only 0.5x in 1Q2026. Viewed on this basis alone, AIS appears to be very lowly levered. For a telecom company, however, leases related to base stations and networks and spectrum payments are effective fixed burdens. Net debt + lease liabilities + spectrum license payable / EBITDA, including these items, was 1.7x at end-2025 and 1.5x in 1Q2026. This level is also sufficiently low, but it is closer to the economic credit reality than ordinary net debt / EBITDA.

Interest-bearing debt increased in 1Q2026. Interest-bearing debt was Bt98,551mn at end-2025 and rose to Bt129,610mn at end-March 2026. The main reason was the USD1bn offshore bond issuance. The company explains that it converted the debt into Thai baht through cross-currency swaps and kept the average cost of debt at 2.6% in 1Q2026. This is positive as funding management. However, from the perspective of foreign-currency bond investors, it is necessary to examine how the issuer will be valued continuously in international bond markets, swap counterparty risk, offshore bond terms, and differences between the investor bases for domestic bonds and US dollar bonds.

The dividend policy is high. The company maintains a policy of paying dividends of at least 70% of net profit, and in 2025 it made substantial shareholder returns including ordinary dividends and special dividends. As long as profitability is high and leverage is low, dividends themselves do not immediately damage credit quality. However, at a stage when spectrum, CAPEX, data centers, virtual banking, US dollar bonds, and 3BB integration are being pursued simultaneously, dividends may reduce financial flexibility. In telecom credit, what matters more than the payout ratio itself is FCF after dividends, short-term debt coverage, and leverage headroom.

The conclusion on the financial profile is that AIS is strong in terms of earnings capacity, EBITDA, interest coverage, and leverage. However, the nature of that strength needs to be read carefully. Ordinary net debt / EBITDA is low, but the ratio including leases and spectrum should be assessed, and the 1Q2026 cash balance may include temporary liquidity after the US dollar bond issuance. Credit quality is supported by high EBITDA and operating cash flow, while the constraints are continuing investment inherent in telecom infrastructure, spectrum payments, substantial dividends, and investments in adjacent areas.

5. Structural Considerations for Bondholders

For AIS bondholders, the first point to confirm is which legal entity owes the debt, which entity generates the cash flow, and which debt is guaranteed. The AIS group includes AIS itself, Advanced Wireless Network Company Limited (“AWN”), TTTBB, 3BBIF, GSA-related companies, G-AIS, and Thai Trinity Holdings, among others. The 2026 US dollar bonds were issued by AIS itself and, under the Offering Circular, are direct, unconditional, unsubordinated, and unsecured obligations of the issuer. They should be treated as general unsecured debt of the issuer itself, not as obligations secured by specific assets or backed by government guarantees.

In the domestic debenture market, debt of AIS itself and AWN is mixed. According to the Annual Report 2025, as of end-December 2025 AIS itself and AWN had 17 long-term debenture series outstanding, totaling Bt82,680mn, with fixed annual interest rates ranging from 1.58% to 3.70%. These trade in the Thai domestic bond market and are covered by Fitch National Rating AAA(tha). Domestic ratings indicate relative credit quality among issuers and obligations within Thailand, and are not the same as the foreign-currency credit risk assessed by US dollar bond investors. A high domestic rating indicates strong funding access, but for offshore bonds, S&P BBB+, Thailand country risk, and liquidity for foreign-currency investors should be assessed separately.

AWN is a core subsidiary of the AIS group. Many telecom operations, including spectrum licenses, mobile networks, and contracts with NT, involve AWN. Fitch rates AIS and AWN at the same AAA(tha), reflecting the parent-subsidiary relationship and AWN’s core status for domestic-rating purposes. Bondholders need to distinguish among AIS parent bonds, AWN bonds, subsidiary debt, and intragroup funding flows. The parent has a strong incentive to support the group, but not all debt necessarily has the same terms or guarantees.

3BB/TTTBB and 3BBIF are structural issues in the fixed broadband business. AIS acquired TTTBB and a 19% stake in JASIF, now 3BBIF. Fixed broadband operating revenue contributes to the AIS group, but leases, network use, and related-party transactions with 3BBIF, existing contracts and litigation at TTTBB, and integration costs are more important than subscriber numbers alone. The Annual Report 2025 includes notes on continuing 3BB-related matters and the relationship with 3BBIF. At present, these are not read as significantly impairing credit quality, but as FBB integration progresses, the fixed-network structure and contractual relationships become more important.

The large shareholder structure should be treated as a governance and capital-policy issue, not as an expectation of support. GULF holds 40.44%, and Singtel-related interests are also large. Both companies are also involved in data-center projects at GSA Holdings and GSA02. The SET/SEC announcement in February 2026 stated that, of Bt3,641mn of shareholder-proportionate financial support to GSA02, an AIS subsidiary would provide Bt910.25mn. This amount is not too large for AIS, but it shows a structure in which GULF, Singtel, and AIS are involved in the same digital infrastructure projects. Bondholders should confirm whether related-party transactions are conducted on market terms, whether the investment burden becomes excessive, and whether shareholder strategy weakens AIS’s standalone financial discipline.

For the US dollar bonds, high-level terms that could be confirmed in the Offering Circular should be separated from terms that should be reviewed in detail before individual investment. Confirmed items are that the 2031 and 2036 bonds are direct, unsubordinated, and unsecured obligations of AIS itself, and that the documentation includes a negative pledge, tax redemption, make-whole redemption, par call, and clean-up call. However, this report focuses on issuer credit and is not a covenant memo. Change of control, cross default, financial covenants, debt limitations, the existence or absence of subsidiary guarantees, the effective impact of structural subordination, and the detailed trigger conditions for the negative pledge and each redemption provision should be reconfirmed in the body of the Offering Circular before investing in the individual bonds.

Litigation and regulatory matters are also structural risks. The Annual Report 2025 describes matters involving migration of 900MHz subscribers with NT, additional revenue claims relating to the 6th/7th Amendments, the 900MHz customer protection period, DPC, AWN, and TTTBB. As an example, NT initially claimed Bt9,126mn, later increased to Bt32,813mn plus VAT and interest, in relation to the migration of 900MHz subscribers to 3G 2100MHz. The arbitral award was favorable to the company, the Central Administrative Court dismissed NT’s petition to set aside the award, and NT’s appeal remains pending. In the 6th/7th Amendments matter, NT’s claim was initially Bt72,036mn and later adjusted to Bt62,774mn. Arbitration ordered AIS to pay Bt31,076mn plus interest, but the Central Administrative Court set aside that decision and found that the company had no additional payment obligation. NT has appealed, and the company views the final outcome as not having a material impact on the financial statements.

For NBTC-related matters, there is a case seeking payment of Bt7,221mn plus interest in relation to revenue during the 900MHz customer protection period. The Central Administrative Court revoked the NBTC’s order, but an appeal remains pending. At TTTBB, large claims related to TT&T bankruptcy proceedings were finally resolved in 2025 with no obligation, while seven claims totaling Bt299mn relating to fiber-optic installation on power poles remain pending. These amounts do not immediately change AIS’s credit quality relative to its EBITDA scale, but the existence of disputes spanning old concessions, state-owned telecom companies, the NBTC, and acquired subsidiaries should be treated as a structural risk of Thai telecom credit.

In summary, AIS bonds can be understood as general unsecured debt of a strong operating company. However, because the group contains multiple debt issuers, spectrum payments, leases, FBB-related contracts, related-party transactions, and data-center joint ventures, bondholders need to confirm not only the “AIS” strong brand but also the location of debt and the location of cash flow. The structure is not excessively risky, but neither is it simple.

6. Capital Structure, Liquidity and Funding

AIS’s capital structure and liquidity were sufficiently strong as of 1Q2026. However, that strength should not be judged by the short-term cash balance alone. Cash at end-March 2026 was substantial at Bt68,094mn, but this was after the USD1bn offshore bond issuance and may include temporary cash before dividend payments. More important is whether AIS can handle operating cash flow, short-term debt, debenture maturities, spectrum payments, leases, CAPEX, and dividends at the same time.

The 1Q2026 maturity schedule shows scheduled payments in 9M2026 of Bt15,180mn of debentures, Bt3,509mn of loans, and Bt3,431mn of 2600MHz spectrum obligations. For 2027, the schedule shows Bt11,000mn of debentures, Bt4,950mn of loans, Bt2,934mn for 2600MHz spectrum, and Bt5,189mn for 700MHz spectrum. Payments for debentures, loans, 2600MHz, 700MHz, and 2100MHz also overlap in 2028 and 2029. Therefore, AIS’s liquidity risk is likely to appear not as a single large maturity, but as a recurring overlap of annual debenture repayments, spectrum payments, leases, CAPEX, and dividends.

The USD1bn bond issuance in March 2026 is important as funding-source diversification. For an issuer with strong access to the domestic debenture market to also access international markets increases future refinancing options. The 2031 and 2036 maturities provide tenors different from the short- to medium-term maturities of domestic bonds and also help maturity diversification. The use of cross-currency swaps to create an effective baht burden is also a measure to limit foreign-currency mismatch. However, as long as AIS relies on swaps, derivative counterparties, hedge accounting, liquidity, the existence or absence of collateral posting, and swap renewal and termination conditions should be reviewed before individual investment.

The 2026 CAPEX plan is Bt30-35bn excluding spectrum. The company indicates that it plans to allocate 55-60% to mobile, around 20% to broadband, around 10% to enterprise, and around 15% to IT and others. Over the medium term, it expects to keep CAPEX at around 15% of total revenue. This is not excessive for a telecom company, but because AIS is simultaneously dealing with data-demand growth, 5G, fixed broadband, IT modernization, data centers, and cloud, there is limited room to cut CAPEX sharply. Even if the economy weakens, reducing network quality would impair competitiveness, so investment rigidity is a credit constraint.

Spectrum payments are fixed burdens unique to telecom companies. In 2025, AIS acquired 2x15MHz of 2100MHz spectrum for Bt14,850mn, and the 1Q2026 MD&A shows a payment schedule for 2100MHz spectrum. Spectrum is an asset that supports network quality and market position, but it creates funding needs at acquisition and ongoing amortization and payment burdens thereafter. AIS’s EBITDA is substantial, so it can currently absorb these costs well, but if future auctions or reallocations increase the burden, the balance with dividends and CAPEX will become important.

Dividends are significant in assessing capital-structure flexibility. AIS has a minimum 70% dividend policy and made substantial shareholder returns in 2025, including ordinary and special dividends. Under high ROE and low leverage, dividends improve capital efficiency. For bondholders, however, the important issue is how far dividends would be restrained in a future stress scenario. The company explains that dividends depend on cash flow, investment plans, future obligations, and business continuity, so the dividend policy is not a fixed liability. However, the higher expectations from the equity market become, the narrower management discretion may become.

Funding access is strong. In 2024, AIS issued Bt25bn of sustainability bonds as the first such bonds in the telecom industry, and in 2026 it issued USD1bn of bonds. This is supported by Fitch’s domestic AAA(tha) rating, S&P BBB+, strong operating CF, and recognition as a leading domestic issuer. At present, the risk of losing access to the domestic bond market is low. However, as international bond issuance has broadened the investor base, financial discipline, transparency, foreign-currency hedging, and covenant protection as viewed by international investors will require attention going forward.

The liquidity assessment is that the risk of short-term funding shortfall is low. At end-March 2026, cash was Bt68,094mn, 1Q2026 operating CF after tax was Bt30,744mn, and company-defined FCF was Bt14,238mn. Scheduled payments in 9M2026 of Bt15,180mn of debentures, Bt3,509mn of loans, and Bt3,431mn of 2600MHz spectrum total around Bt22.1bn. Even considering cash changes before and after dividend payments, cash, operating CF, and domestic and international market access should be sufficient to manage them. However, unused committed lines and bank borrowing terms could not be confirmed in this report. Therefore, the liquidity assessment is limited to the judgment that cash on hand and operating CF are substantial, and does not assume bank backstops.

The path through which credit quality could weaken is unlikely to be a one-off liquidity shortage. It is more likely to appear through rising leverage including leases and spectrum as CAPEX, spectrum, dividends, data centers, virtual banking, and FBB integration all become heavier at the same time. For AIS, therefore, the issue to monitor is less “whether it can repay” and more “whether it can maintain both low leverage and high dividends.”

7. Rating Agency View

From a rating perspective, AIS receives one of the highest assessments in Thailand. The 1Q2026 MD&A shows a Fitch National rating of AAA(THA), Outlook Stable, and S&P of BBB+, Outlook Stable. In a Fitch Ratings action republished in November 2025, Fitch affirmed AIS and AWN’s National Long-Term Rating at AAA(tha), National Short-Term Rating at F1+(tha), and senior unsecured rating at AAA(tha), with a Stable Outlook. The ratings reflect strong market positions in mobile and fixed broadband, conservative finances, low leverage, and solid operating CF.

According to the republished Fitch article, AIS has revenue market shares of around 50% and 47% in mobile and broadband, respectively. Fitch expects AIS’s EBITDA net leverage to be around 0.9x-1.0x in 2025-2027, and expects FCF to be neutral to slightly positive in 2025 and 2026. These are external assessments that AIS’s current fundamentals are consistent with a domestic AAA(tha) rating. On the other hand, Fitch indicates that sustained EBITDA net leverage above 2.0x or adverse regulatory changes would create downward pressure.

The ratings need to be read carefully. AAA(tha) is a Thai national-scale rating and indicates relative credit quality of issuers and obligations within Thailand. It does not mean the same thing as an international AAA rating. The Offering Circular for the US dollar bonds states that the 2031 and 2036 bonds have an expected S&P rating of BBB+. Therefore, the rating reference point differs depending on whether AIS is viewed by domestic debenture investors or by US dollar bond investors. The high domestic rating should not be reinterpreted as meaning that the credit risk of the international bonds is extremely low.

The rating agencies’ view and the analysis in this report are broadly consistent. AIS’s business base, EBITDA, low leverage, and domestic market access are strong. At the same time, this report takes a more conservative approach to unresolved items based on public information than rating agencies may in their published materials. Specifically, individual bond covenants, unused committed lines, details of swap agreements, GSA-related transactions, the final impact of litigation, and TRUE’s competitive behavior require additional confirmation before investment.

Regarding TRIS, this report could not confirm AIS’s latest TRIS rating as of the preparation date. Older TRIS information can be found, but it is too old to use as a current primary reference rating. For Thai domestic issuers, the presence or absence of a TRIS rating is also important, but this report focuses on confirmed Fitch National Rating and S&P. Future updates should confirm the latest rating from the TRIS official page or Thai domestic debenture materials.

The rating monitoring points are clear. First, whether effective leverage including leases and spectrum remains low. Second, whether AIS can maintain ARPU and subscriber bases in mobile and FBB. Third, whether 3BB integration, data centers, and virtual banking avoid excessive pressure on EBITDA and FCF. Fourth, whether regulation, spectrum, and litigation avoid major spillover into financials. Fifth, whether the balance between dividends and growth investment remains intact.

8. Credit Positioning

Based only on public information, AIS is positioned among the stronger Asian telecom credits in terms of domestic business foundation and financial conservatism. It has leading positions in mobile and fixed broadband, a high EBITDA margin, and low leverage even including leases and spectrum. It has the business stickiness and funding access required of a mature telecom company.

However, it would be too simplistic to treat AIS as the same type of low-risk name as a major developed-market telecom company. AIS is fundamentally a domestic Thai operating company, and geographic diversification is limited. Because it has differences between domestic and international ratings, spectrum-system exposure, legacy concession-related litigation, the GULF/Singtel large shareholder structure, and data-center and virtual-bank investments, international bond investors should focus on operating CF, fixed burdens, and country, currency, and institutional risks.

By tenor, the 2031 US dollar bonds are the maturity through which investors assess how AIS absorbs its current business base and the 2026-2030 investment cycle. The 2036 US dollar bonds are longer-dated and are more exposed to future spectrum reallocation, 5G/6G investment, data centers and cloud, parent-company structure, and changes in Thailand’s regulatory environment. The 2031 bonds are closer to the current state of the business and financial profile, while the 2036 bonds are more exposed to capital allocation and institutional-change risks.

This report has not confirmed market spreads, prices, yields, OAS, or same-tenor comparisons, so it does not make a cheap/rich judgment. From a credit-positioning perspective, AIS is an “investment-grade telecom issuer supported by a strong domestic market position and low leverage.” However, the appearance created by domestic AAA(tha) and the BBB+ equivalent international credit risk seen by US dollar bond investors need to be separated.

9. Key Credit Strengths and Constraints

AIS’s first strength is its leading business foundation in Thailand’s telecom market. The scale represented by 46.9mn mobile subscribers, 5.3mn FBB subscribers, and 18.5mn 5G subscribers supports a floor for revenue. The second strength is ARPU improvement and high EBITDA. In 1Q2026, blended ARPU increased 4.2% year on year, FBB ARPU increased 3.9% year on year, and EBITDA margin was 55.3%. The third strength is low leverage and strong interest-payment capacity. In 1Q2026, net debt / EBITDA was 0.5x, leverage including leases and spectrum was still only 1.5x, and interest coverage was 17.2x. The fourth strength is funding capacity, with access to both domestic debentures and US dollar bonds.

The constraints are spectrum and capital expenditure, high dividends, regulatory, litigation, and legacy concession-related risks, and execution risk in growth investments. A telecom company cannot easily stop investing if it wants to defend its market position. The 2026 CAPEX plan is Bt30-35bn, with spectrum payments existing separately. If high dividends and GULF/Singtel-related growth investments continue simultaneously, financial flexibility will be used. Although the company views NT, NBTC, and TTTBB-related disputes as having no material impact, some claims are large. Data centers, AIS Cloud, and virtual banking offer the possibility of revenue diversification, but investment recovery uncertainty is high.

The upper limit of AIS’s credit assessment is determined by whether it can maintain a leading position in Thai domestic telecom while preserving low leverage. The lower limit is determined by its FCF resilience if spectrum, CAPEX, dividends, growth investments, and renewed competition all overlap. At present, the strengths clearly outweigh the constraints, but the constraints are structural and do not disappear after one strong year of results.

10. Downside Scenarios and Monitoring Triggers

The most realistic downside scenario for AIS is one in which ARPU improvement stops, CAPEX and spectrum payments remain high, and dividends are maintained. In this case, even if revenue does not decline significantly, FCF after dividends would be pressured. For telecom companies, even if demand is resilient, credit quality does not improve if investment is heavy. In particular, if 5G data usage, FBB integration, IT modernization, content, and data centers all consume funds at the same time, cash may not remain even if EBITDA is strong.

The second downside is renewed competition. If TRUE strengthens pricing, handset, content, or bundle offerings in mobile or FBB, AIS may increase promotional expenses, handset subsidies, content costs, and network investment to retain subscribers. Renewed competition would first appear in ARPU, churn, net additions, marketing expense, and device margin, and would then spread to EBITDA margin and FCF. As of 1Q2026, competition appears manageable, but even in a two-player market there is no guarantee that competition will remain moderate.

The third downside is a delay in FBB integration. The integration of TTTBB/3BB has made AIS a leading fixed broadband operator, but if integration is delayed, reductions in network costs, improvements in customer experience, brand integration, and ARPU enhancement will also be delayed. Because FBB involves customer acquisition costs and maintenance costs, profitability can deteriorate even if subscriber numbers increase, if churn rises or installation, maintenance, and content costs expand. The relationship with 3BBIF and network-use terms also require continuing confirmation.

The fourth downside is regulatory, litigation, and legacy concession matters. Some NT-related litigation matters include large claim amounts. The company indicates that outcomes have been favorable or that it expects no material impact, but final decisions depend on courts and arbitration. In addition, stricter SIM registration, anti-fraud measures, data protection, spectrum rules, and NBTC regulatory changes can affect costs, subscriber acquisition, and service operations. Regulatory risk does not necessarily destroy credit quality at once, but it can operate through ongoing costs and operating restrictions.

The fifth downside is expansion of growth investments. Data centers, cloud, and virtual banking may provide revenue diversification over the long term. However, they take longer to recover investment than telecom lines, and project-by-project profitability is important. The Bt910.25mn support for GSA02 is manageable on a standalone basis, but if GSA01, GSA02, GSA03, virtual banking, cloud, and IT modernization expand, the total investment burden needs to be tracked. In joint investments with related parties, bondholders should also assess whether investment decisions are sufficiently aligned with AIS’s standalone creditor interests.

The sixth downside is a change in how international bond markets view AIS. With the USD1bn bond issuance in 2026, AIS became an issuer watched not only by domestic investors but also by international investors. In Thailand, AIS is AAA(tha), but in international bond markets it is equivalent to BBB+ and is affected by the Thai sovereign, currency, global rates, Asian telecom spreads, and liquidity. A deterioration in the price of US dollar bonds does not immediately mean the issuer’s credit quality has worsened, but it can affect future foreign-currency funding costs and market access.

The indicators to monitor are core service revenue, mobile ARPU, postpaid mix, 5G subscribers, FBB subscribers, FBB ARPU, enterprise revenue, EBITDA margin, service EBITDA margin, operating CF, FCF, CAPEX, dividends, interest-bearing debt, leverage including leases and spectrum, short-term debt, spectrum payable, and interest coverage. In addition, it is necessary to monitor GSA-related support, virtual-bank profit/loss, NT and NBTC-related litigation, Fitch/S&P ratings, US dollar bond covenants, and US dollar bond market levels.

11. Credit View and Monitoring Focus

AIS’s current credit level is very strong as a Thai domestic issuer, and as an international bond credit it is an investment-grade telecom credit consistent with S&P BBB+. However, international bond investors should not treat it as having the same cushion as domestic AAA(tha), and need to consider Thailand single-country concentration, offshore bond covenants, swap details, international market liquidity, and currency and sovereign constraints. The current credit quality is supported by leading positions in mobile and fixed broadband, high EBITDA, low leverage including leases and spectrum, strong interest coverage, and domestic and international funding access. The direction of credit quality is stable to flat, and the probability of rapid credit deterioration currently appears low. However, if competition, regulation, spectrum, dividends, and data-center investment overlap, the effects are likely to appear first in effective leverage and FCF.

The core support for AIS’s credit quality is its domestic telecom business base and cash flow. As of 1Q2026, AIS had 46.9mn mobile subscribers, 5.3mn FBB subscribers, and 18.5mn 5G subscribers, and mobile and FBB ARPU improved year on year. EBITDA margin was 55.3%, service EBITDA margin was 68.5%, and operating CF was Bt30,744mn for three months. This scale and profitability give AIS high capacity to absorb normal capital expenditure, spectrum payments, and short-term debt.

However, it is insufficient to view AIS simply as a “low-leverage telecom company.” Net debt / EBITDA excluding leases and spectrum is low at 0.5x, but to assess the effective fixed burdens of a telecom company, the ratio including lease liabilities and spectrum license payable should be emphasized. This ratio was also sufficiently low at 1.5x in 1Q2026, but if CAPEX, dividends, spectrum, GSA, and virtual banking overlap, this effective-burden ratio may rise before ordinary net debt / EBITDA does.

The USD1bn bond issuance in 2026 has two credit aspects. It is positive that AIS broadened funding sources to international markets and diversified maturities into 2031 and 2036. Converting the burden into baht through cross-currency swaps is also reasonable foreign-currency risk management. At the same time, international bond issuance means AIS is no longer only a domestic AAA(tha) issuer, but also a US dollar bond issuer rated S&P BBB+. Going forward, covenants, currency, country risk, market liquidity, and relative value as viewed by international bond investors will become important in addition to the perspective of domestic investors.

For bondholders, the greatest source of comfort is that both the business and the financial profile are strong. The biggest constraint is that, precisely because AIS is strong, it can easily use funds for investment and dividends. The GULF and Singtel large shareholder structure, GSA data centers, virtual banking, and FBB integration may broaden long-term business opportunities, but if capital allocation discipline weakens, they can erode bondholder cushion. Therefore, future credit assessment should place more emphasis on FCF after dividends, leverage including leases and spectrum, CAPEX, dividends, and related-party transactions than on revenue growth.

As of this report, no material deterioration factor requiring a change in AIS’s credit view has been confirmed. Rather, full-year 2025 and 1Q2026 figures were solid, and 3BB integration, 5G, FBB, and funding diversification have broadened credit options. For US dollar bond investors, however, the high domestic rating alone should not provide comfort. Offshore bond covenants, S&P rating, relative positioning in international markets, competition with TRUE, regulation and litigation, and spectrum payments need to be confirmed.

12. Short Summary & Conclusion

Advanced Info Service is one of Thailand’s leading telecom companies and a high-profitability, low-leverage investment-grade credit with mobile, fixed broadband, and enterprise communications businesses. Full-year 2025 and 1Q2026 performance was solid, and market access has expanded both domestically and internationally. However, bondholders should continue to monitor not only ordinary net debt / EBITDA, but also leverage including leases and spectrum, capital expenditure, dividends, 3BB integration, GULF/Singtel-related investments, and US dollar bond covenants.

13. Sources

Primary company sources

• Advanced Info Service, Annual Reports page, accessed 2026-05-13
  https://investor.ais.co.th/en/document/annual-reports
• Advanced Info Service, Annual Report 2025
  https://investor.ais.co.th/en/document/viewer/186586/annual-report-2025
• Advanced Info Service, Management Discussion and Analysis 1Q2026, dated 2026-05-07
  https://investor.ais.co.th/en/document/viewer/191493/management-discussion-and-analysis-q1-2026
• Advanced Info Service, 1Q26 Opportunity Day presentation, dated 2026-05-08
  https://investor.ais.co.th/en/document/viewer/191494/opportunity-day-q1-2026
• Advanced Info Service, Financial Highlights page, accessed 2026-05-13
  https://investor.ais.co.th/en/results-and-reporting/financial-highlights
• Advanced Info Service, What We Do page, accessed 2026-05-13
  https://investor.ais.co.th/en/our-company/what-we-do
• Advanced Info Service, Shareholder Structure page, accessed 2026-05-13
  https://investor.ais.co.th/en/shareholder-information/shareholder-structure
• Advanced Info Service, Sustainable Finance page, accessed 2026-05-13
  https://investor.ais.co.th/en/sustainability/sustainable-finance
• Advanced Info Service, Corporate Actions and Acquisitions page, accessed 2026-05-13
  https://investor.ais.co.th/en/stock-information/corporate-actions-and-acquisitions
• SGX, Listing Prospectus / Shareholders' Circulars, Advanced Info Service Public Company Limited, Offering Circular dated 2026-02-24
  https://links.sgx.com/1.0.0/prospectus-circulars/56588
• SEC/SET disclosure, Advanced Info Service connected transaction regarding GSA02, dated 2026-02-03
  https://market.sec.or.th/public/idisc/Download?FILEID=dat%2Fnews%2F202602%2F0268NWS030220261910437600E.pdf

Rating and market structure sources

• Fitch Ratings action republished by ThaiPR, "Fitch Affirms Advanced Info Service, Advanced Wireless Network at AAA(tha); Outlook Stable," 2025-11-24
  https://www.thaipr.net/en/finance_en/3668665
• Fitch Ratings action republished by Thailand4, "Fitch Affirms Advanced Info Service, Advanced Wireless Network at AAA(tha); Outlook Stable," 2025-11-24
  https://www.thailand4.com/en/1519619
• AIS, Resource Center, including Telecom Background 4Q25 and other investor materials
  https://investor.ais.co.th/download.html

Unverified / Pending

• Bloomberg, internal price data, real-time bond prices, spreads, OAS, and CDS have not been confirmed.
• Before investing in AIS US dollar bonds, it is necessary to further confirm in the Offering Circular the change of control, cross default, financial covenants, debt limitations, existence or absence of collateral and guarantees, effective impact of structural subordination, and detailed trigger conditions for the negative pledge and each redemption provision.
• The latest TRIS rating could not be confirmed as of the preparation date of this report. It should be reconfirmed on the official page before future domestic debenture investment.
• TRUE’s latest subscribers, ARPU, FBB metrics, and official NBTC statistics have not been confirmed. To reinforce AIS’s own disclosed market-share figures, competitor and regulatory materials are required.
• Unused committed lines, bank borrowing terms, details of cross-currency swap contracts, and collateral-posting conditions have not been confirmed.
• The final outcomes of NT, NBTC, and TTTBB-related litigation and adequacy of provisions have been confirmed only on a limited basis based on company disclosure; no legal view has been confirmed.