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Thai Oil Additional Discussion Report: Interpreting Crude Sourcing and Refining Margins

Thai Oil Additional Discussion Report: Interpreting Crude Sourcing and Refining Margins

1. Purpose and Scope

This note organizes the discussion held on 2026-05-12 as a supplementary report to assist in reading the existing Thai Oil issuer summary. Not all points in this discussion are adopted as independently verified facts. Verified foundational information remains in the issuer summary dated 2026-05-12. Specifically, the starting points are: Q1/26 profits were substantially above expectations; 91% of Q1/26 crude sourcing was from the Middle East; stock gains were significant; and from Q2/26 onwards, crude costs, liquidity, inventory losses, and government interventions should be monitored.

A key purpose of this discussion is to avoid treating the "91% Middle East" figure as a mere sourcing composition. Viewed in isolation, it could suggest that Thai Oil’s crude procurement would nearly halt if the Strait of Hormuz were blocked. Conversely, ignoring alternative sourcing measures prevents assessment of how much the company has mitigated risk. Therefore, for credit analysis, the focus shifts from a simple binary of “can crude be procured?” to “to what extent can high-cost alternative crude be continuously secured while preserving GIM, cash flow, liquidity, and CFP investment capacity?”

2. Key Takeaways

The existing issuer summary correctly identifies Middle East dependence, Q1/26 stock gains, and reversal risks from Q2/26 onward. However, the emphasis could be improved. The 91% Middle East figure is not merely an input cost issue. If Strait of Hormuz transit constraints were prolonged, the conventional refinery procurement model itself would be challenged. Therefore, credit reports should explain from where, in what volumes, at what cost, and with what refinery compatibility alternative crude can be procured.

The interpretation of the 91% figure has evolved through this discussion. If Thai Oil had remained 91% Middle East dependent, the central concern would have been crude shortage and capacity utilization declines. However, a Kaohoon International article dated 2026-05-12 reports that, according to Morgan Stanley, Thai Oil’s Middle East crude ratio fell to roughly 34-35% on a monthly basis in April and May. If confirmed through official company sources or Q2/26 disclosures, the physical risk of crude unavailability is substantially mitigated. Nevertheless, credit risk persists, manifesting through crude premiums, freight, insurance, crude quality, yields, inventories, price pass-through, and operating cash flow.

Hence, a more accurate characterization is not “a company unable to receive 91% of its crude,” but rather “a company that, despite entering a crisis at 91% Middle East dependence, had to rapidly shift to alternative sourcing.” This framing allows assessment of operational flexibility while retaining the downward pressure on margins and liquidity as a credit risk.

3. Principal Discussion Points

3.1 Middle East Dependence: Structural Risk, Not a Simple 91% Supply Loss

The existing summary confirms Q1/26 crude sourcing composition: Middle East 91%, domestic 6%, Far East 2%, West Africa 1%, and notes that the company implemented sourcing adjustments to reduce Middle East dependence during emergencies. The extent of this reduction, however, is not explicitly quantified. This gap was highlighted in the current discussion.

From a credit perspective, Q1/26 91% Middle East dependence represents structural vulnerability. Thai Oil’s refinery is strongly exposed to Strait of Hormuz risks, Middle East crude premiums, shipping arrangements, insurance, and geopolitical factors. If the April-May secondary reporting is directionally accurate, portraying this vulnerability as “91% of crude unavailable” is overly static. A more appropriate view is that Thai Oil demonstrated considerable crude slate flexibility, though the cost and sustainability of that flexibility remain unverified.

Thus, this risk is better characterized as “manageable but high operational risk” rather than “uncontrollable, immediate default risk.” It is manageable because there appears to be room to secure alternative crude and maintain operations. Nevertheless, alternative sourcing typically affects procurement costs, transit time, inventory, working capital, crude characteristics, and product yields, leaving residual credit weight.

3.2 Refining Margin Improvement: Regional/Global Factors with Company-Specific Inventory Gains

Q1/26 refining margin improvements should not be interpreted as a Thailand-only phenomenon. The issuer summary identifies Middle East geopolitical tensions, Strait of Hormuz transit constraints, export disruptions from Middle Eastern refineries, and reduced operations at some Asian refineries as contributing factors. This reflects regional and global refining cycles tightening product supply and widening cracks.

Thai Oil additionally benefited from company-specific inventory timing effects. Q1/26 EBITDA reached THB 31,641 million and net profit THB 19,481 million, with stock gains of THB 22,557 million. Inventory valuation losses (THB 5,811 million) and financial instrument fair value losses (THB 8,582 million) also occurred. Consequently, headline profits overstate ongoing credit strength.

Nevertheless, Q1/26 was not solely driven by accounting inventory gains. GIM excluding stock gain/loss reached USD 14.8/bbl (up from USD 11.8 Q4/25 and USD 5.4 Q1/25). Refinery Margin was USD 12.6/bbl (up from USD 9.3 Q4/25 and USD 3.5 Q1/25), indicating core margin improvement. However, the sharp EBITDA and net profit rise was significantly supported by transient factors prone to reversal.

3.3 Crude Prices and EBITDA: Not Simply Positively Correlated

As a downstream refiner, Thai Oil’s credit strength does not automatically improve with crude price increases. The critical factor is the differential between product prices and crude costs—refining margins—and the timing difference between crude acquisition and product sales.

Rapid increases in crude and product prices can boost EBITDA via stock gains, as cheaper purchased crude is processed and sold at higher product prices. Q1/26 exemplified this. Likewise, if cracks for diesel, jet fuel, or gasoline widen beyond crude costs, core margins improve.

Conversely, the structure reverses: high-cost inventory followed by falling crude prices leads to stock losses. Rising premiums, freight, and insurance, coupled with insufficient product price pass-through due to demand slowdown or government intervention, can depress EBITDA and operating cash flow even during crude price spikes. Therefore, bond investors should focus not on “did crude prices rise?” but on whether GIM excluding stock gains, operating cash flow, and liquidity improve net of working capital.

3.4 FY2025 Weakness and Q1/26 Recovery Quality

FY2025 underperformed FY2022-FY2023 high-margin levels. Revenue fell from THB 505,703 million (FY2022) to THB 394,336 million (FY2025), and EBITDA contracted from THB 37,187 million to THB 17,619 million. The existing summary attributes this deterioration to refining cycles, reduced product spreads, inventory effects, weak petrochemical/aromatics performance, and CFP execution burden.

Q1/26 core margin indicators, excluding inventory gains/losses, improved relative to FY2025. GIM excluding stock gain/loss and Refinery Margin both exceeded Q1/25 and Q4/25. However, annualizing Q1/26 is inappropriate. Large portions of EBITDA and net profit were propelled by stock gains and transitory factors, and similar Middle East shocks could manifest as high-cost crude procurement and stock losses in Q2-Q3.

In conclusion, Q1/26 marked a recovery from near-worst FY2025 margins but does not indicate a return to a sustained high-profit regime. Subsequent verification should focus on GIM excluding stock gain/loss, Refinery Margin, operating cash flow, inventories, crude premiums, and cash balances rather than headline net profit.

3.5 Domestic Position and Competitors

Thai Oil’s domestic presence provides clear credit support. The issuer summary cites company disclosures: refining capacity of 275 kbpd, covering ~21% of Thailand’s refining capacity and ~35% of domestic petroleum product demand. This indicates Thai Oil’s role as a strategically important domestic refinery, beyond a commodity player.

Domestic importance does not equate to pricing power. Thai Oil competes with other domestic refiners and is influenced by Asian product markets, import economics, and government fuel pricing. Key domestic competitors include PTT Global Chemical, IRPC, Bangchak, Bangchak Sriracha, and Star Petroleum Refining. During crises, domestic significance can also constrain operations: government and social expectations for continued supply may sustain operations despite margin or working capital pressures.

4. Implications for Existing Issuer Summary

Future updates of the issuer summary should enhance the Middle East crude dependence section in three ways:

  1. Treat Q1/26 91% Middle East dependence as a central credit point, not merely a sourcing composition. Prolonged Strait of Hormuz constraints would impair conventional crude procurement if alternative crude is unavailable.

  2. If April-May sourcing composition changes can be verified, highlight them as mitigating factors—but avoid stating “risk eliminated.” Physical unavailability risk declines materially, yet procurement costs, margins, yields, inventories, and working capital remain key risks.

  3. Avoid overreliance on Q1/26 profit spikes in drawing conclusions. Q1/26 demonstrated Thai Oil’s ability to capture timing gains during price shocks. For bondholders, the critical question is whether high-cost alternative sourcing erodes liquidity buffers created through stock gains, asset monetization, debt repayment, and hybrid issuance.

5. Next Steps for Verification

The most critical confirmation is the Q2/26 disclosure:

  1. Verify April-May sourcing composition via company MD&A, investor materials, and management commentary.
  2. Confirm whether Thai Oil maintained high operating rates without significant margin erosion.
  3. Assess whether Q1 stock gains translated into cash post inventories, receivables, crude purchases, and CFP investments.

Specifically, review crude sourcing mix, refinery utilization, crude premiums, freight, GIM excluding stock gains/losses, market GRM, stock gain/loss, operating cash flow, inventory levels, cash and cash equivalents, net debt/equity, short-term debt, working capital support from PTT, government pricing/export policies, remaining CFP investments, and project progress.

6. Unverified / Pending Items

The April-May sourcing composition discussed remains secondary-report and analyst-report based. The existing issuer summary does not include the 34-35% Middle East share, and this additional discussion does not update issuer_notes, knowledge_snapshot, or source_registry. Verification via Thai Oil’s Q2/26 MD&A, investor presentations, analyst calls, or official statements is required before adopting as confirmed company facts.

The detailed economics of alternative crude are also unverified. Discussion included sourcing from West Africa, the Americas, domestic sources, and the Far East. Kaohoon International reports a decline of Middle East share to 34-35% in April-May, with increased sourcing from South and North America in May. However, monthly crude slate, grades, landed costs, voyage durations, refinery compatibility, and yield impacts remain independently unconfirmed within the project.

Refining margin sustainability requires additional confirmation. The issuer summary indicates that Q1/26 margin improvements were explainable by regional product supply tightening. The durability of this improvement should be verified against Singapore complex margins, Asian diesel/jet cracks, Thai domestic pricing, Asian refinery outages, and Q2-Q3 guidance.

7. Reference Context