Kpler shipping data reported by Al Jazeera shows that 236 vessels transited the Strait of Hormuz between 1 and 19 August. Before the war, a comparable number of ships passed through the same waterway in under two days.
That comparison describes August more completely than any price chart. The story did not move because a barrel of oil became more expensive. It moved because the physical route that carries a large share of the world’s traded oil has been operating, for six months now, well below the volumes markets had treated as a constant.
What actually changed in August
The month opened with a negotiating window still nominally open. A memorandum of understanding signed by the United States and Iran in June had established a sixty day period for talks. That period expired on 17 August without an agreement, and Iran’s foreign ministry publicly discounted the deadline’s significance.
Two weeks later the military position shifted. On 30 August, United States forces struck Iranian missile and rocket launcher positions on Larak Island, the first significant exchange in roughly a month. Iran’s Revolutionary Guard responded with missile attacks on United States bases in Jordan. On 31 August, the United Kingdom Maritime Trade Operations reported that a tanker transiting the Strait had been struck by three projectiles.
Crude reacted accordingly. Brent settled at US$94.65 a barrel on 1 September, having moved above US$91 on 31 August.
The routing data underneath that price is arguably the more instructive number. Of the 112 oil and gas vessels identified by Kpler between 1 and 19 August, 89 were classified as travelling via dark or otherwise unclassified routes, meaning their precise routing could not be determined from the available AIS data. Vessels are still moving. They are moving in a way that suggests operators are managing a risk they cannot price with confidence.
A thinner cushion than usual
Energy markets absorb geopolitical headlines regularly. What distinguishes the current episode is the size of the buffer available to absorb them.
The International Energy Agency’s August report put global oil supply at 101.5 million barrels a day in July, some 6.3 million barrels a day below the level of a year earlier. Observed inventories fell by 69 million barrels over the month, dropping below 7.9 billion barrels for the first time since April 2025. Cumulative draws since late February reached 410 million barrels, an average of 2.7 million barrels a day.
Spare production capacity tells a similar story. The IEA assessed total effective OPEC+ spare capacity at 1.09 million barrels a day, with only 0.07 million barrels a day of that residing among the core OPEC-8 producers.
None of this constitutes a forecast. It describes the condition of the shock absorber rather than the shock. In July alone, benchmark crude traded across a range of almost US$40 a barrel, which is itself a reasonable proxy for how little consensus exists about where this settles.
The transmission into Australian numbers
For Australian investors, the relevant question is not the barrel price. It is what the barrel price has already done to domestic data, and what that has done to policy.
The Australian Bureau of Statistics monthly CPI indicator, released on 26 August, showed annual inflation of 3.5 per cent in July, down from 3.8 per cent in June. The trimmed mean held at 3.6 per cent, unchanged from the prior month. Automotive fuel rose 7.5 per cent over the month after three consecutive monthly declines, which the ABS attributed to higher global oil prices alongside a partial unwinding of federal fuel excise relief. Housing remained the largest single contributor at 5.0 per cent annually.
The divergence between the two headline measures is the detail worth holding onto. The top line moved down. The underlying measure did not.
The Reserve Bank’s August statement reflected that. The Monetary Policy Board left the cash rate at 4.35 per cent on 11 August and described headline inflation as still too high, with trimmed mean inflation elevated and little changed. The Board stated that the disruption to global oil supply is adding directly to inflation, and that higher fuel prices are being passed through to the prices of other goods and services, so inflation is likely to remain high for some time. On the Bank’s own projections, inflation is not expected to return to around the midpoint of the target range until late 2027, and the Board identified upside risks to that projection.
That is a materially different rate environment from the one many portfolios were constructed for.
The concentration question
There is a second reading of August that has nothing to do with energy.
The Strait of Hormuz is a single geographic point through which, on widely cited estimates, close to a fifth of globally traded oil moves. For years it functioned as infrastructure rather than as a variable. Its capacity was assumed, and that assumption was embedded in the pricing of a great many assets that had no obvious connection to shipping.
The portfolio parallel is worth sitting with. A holdings list can show many line items, several managers and a range of product structures while resting on one shared dependency. Diversification is a statement about behaviour under stress, not a count of positions. A waterway that appeared in nobody’s risk register until February is a reasonable prompt to ask which comparable assumptions sit unexamined inside a portfolio.
That question does not require anyone to change anything. It requires an answer.
What a September review can reasonably ask
Three questions follow from the month, and none of them presuppose a conclusion.
First, which holdings in the portfolio are exposed to a sustained higher fuel cost base, whether directly through energy inputs or indirectly through the pass-through the RBA has described.
Second, if inflation does not return to around the midpoint until late 2027, does the defensive allocation remain aligned with the purpose it was built to serve, and can that purpose be stated in writing.
Third, for each significant holding, what conditions would place it under pressure. Where those answers cluster, the diversification may be narrower than the holdings list indicates.
A month like August rewards specificity over reaction. The data has moved. The appropriate response is to establish what it has moved in your own portfolio, and to record the reasoning either way.
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