Short sellers are building against Australia's banks as the US bond rout crosses the Pacific

Australia has not been spared. The 10-year Commonwealth bond yield reached 5.16% on 1 September, its highest since April 2011, and has since risen to 5.40%. That is about 22 basis points above the US equivalent. The cash rate is 4.35%, and markets give the Reserve Bank a probability of around 95% of raising it to 4.60% at its meeting on 29 September.

Short sellers have moved with the bond market. In the four weeks from 21 August to 18 September, net short positions rose in every one of the big four banks, Bendigo and Bank of Queensland. They also rose in nine of the ten large REITs we track, in Transurban and APA, and in the most heavily shorted software names. Across the 249 ASX stocks worth more than A$1 billion in our screener, the average short position rose 0.11 percentage points over the same four weeks. The six banks averaged a rise of 0.60pp.

This piece sets out how a US bond selloff reaches Australia, and then what ASIC's short-position data shows about which of those channels the market is positioning for. The short figures are Shorted's own, drawn from ASIC's daily aggregate. Every move is in percentage points of shares on issue.

How a Treasury selloff reaches Australia

There are four channels, and they do not all push the same way.

Long-term borrowing costs. Australian government bonds price off the global market. When investors demand more to hold 10- and 30-year US debt, they demand more for Australian debt of the same maturity too. That feeds straight into fixed mortgage rates and into the wholesale funding the banks raise offshore. Shane Oliver, AMP's chief economist, told the ABC the move means "higher fixed mortgage rates, making it harder for new home borrowers".

The cash rate. The inflation driving US yields comes largely from energy prices, and Australia imports that inflation too. The RBA's expected hike is the domestic transmission. Most Australian mortgages are on variable rates, so it lands on household budgets within weeks. Australian households owed A$3.45 trillion at the end of March, and household debt stood at 177.7% of income (ABS and RBA series, via Shorted's housing data).

Valuations. A higher risk-free rate lowers the present value of any long-dated cash flow. That hits hardest where the cash flows are furthest out or most bond-like: property trusts, toll roads and pipelines, and software companies valued on earnings years from now.

The currency. This is the channel that has not behaved as expected. A US rate shock usually strengthens the US dollar against the Australian dollar. Instead, the RBA's AUD/USD series rose from 0.65 in October 2025 to 0.72 on 4 September. Australian rates are rising at least as fast as American ones, and commodity exporters are benefiting from the same energy and metals prices that are driving inflation.

The banks

Short positions in three of the six banks were at their highest in a year on 18 September. The daily series shows a steady climb rather than a single jump. Westpac's position rose on 18 of the 20 trading days in the window and Commonwealth Bank's on 14. For both, the pace picked up in the last days of August, as Australian 10-year yields climbed towards their 15-year high on 1 September.

The regionals moved most. Bendigo added a full percentage point and Bank of Queensland 0.78pp. This fits the usual argument for why higher rates hurt smaller lenders more than the majors: they have less pricing power on deposits, they depend more on wholesale funding, and their loan books lean more heavily on the mortgage market. But the data does not tell us which of those arguments any particular short seller holds, or whether they hold one at all.

Absolute positions are still small. At 2.47%, Commonwealth Bank remains far below the double-digit positions in the most shorted stocks. A bet against a major bank is a bet that earnings disappoint over a cycle, not a call for a collapse. What has changed is the direction, and every bank on the list is moving the same way.

Property and infrastructure

Ten of the largest REITs were in our sample: Goodman, Scentre, Vicinity, GPT, Mirvac, Dexus, Charter Hall, HomeCo Daily Needs, Charter Hall Long WALE and BWP. On average their short positions rose from 1.31% to 1.69%, and nine of the ten rose. Goodman, whose earnings lean on development, increasingly of data centres, rather than on rent from existing buildings, was the only fall. Charter Hall's position is at a 12-month high. The builds cluster in office, retail and long-lease trusts, the parts of the sector whose valuations follow bond yields most closely.

The two largest moves came from companies exposed to property activity, not property prices. PEXA runs the electronic settlement platform for most Australian property transactions, and its revenue follows how many properties change hands. Lendlease, already one of the more heavily shorted large caps, reached 8.89% on 10 September before settling at 8.59%.

Transurban and APA are the market's clearest bond proxies: regulated or contracted cash flows stretching out for decades, paying out most of what they earn. Both short positions jumped on 31 August, Transurban by 0.45pp and APA by 0.55pp in one day. Transurban's position reached a 12-month high of 2.21% on 14 September.

Stockland (SGP) is left out of the table on purpose. Its short position fell from 5.63% to 0.59% in a single day, 31 August. A 5pp cover in one print is almost always a hedge or a deal-related position unwinding, not a change of view about the housing market. Treating it as a signal would flatter any argument that includes it.

Households and long-duration growth

The household story is mixed. Short sellers added to furniture, auto and leisure retailers: Nick Scali, Harvey Norman, Super Retail and Eagers. These are big-ticket, often debt-funded purchases that households postpone when mortgage repayments rise. Zip, whose buy-now-pay-later model depends on cheap funding, added nearly a point to reach 10.96%. But JB Hi-Fi and Lovisa were covered hard, and Wesfarmers (WES) barely moved. Across the seven retailers in our sample, the average position rose only 0.12pp, close to the market-wide figure.

The growth names are more consistent. WiseTech crossed 10% for the first time in at least a year, and NEXTDC and Xero both built. These are the companies where the most value sits in cash flows years away, so they are the most exposed to a higher discount rate. Technology One (TNE) was the exception, down 0.46pp.

The stocks that should benefit were shorted too

Higher rates help some businesses. Insurers earn more on the premiums they invest. Computershare earns interest on client balances. Challenger's annuity book reprices. If short sellers were running a clean rates trade, you would expect covering here. Instead, QBE (QBE), IAG (IAG), Suncorp (SUN), Computershare (CPU), Challenger (CGF) and Macquarie (MQG) all saw positions rise. The average went from 0.59% to 0.82%. The bases are tiny: QBE's position is at its highest since June, and that is still only 0.57%. Still, it undercuts any claim that the September builds were a precise macro trade. Part of what happened was a general increase in hedging as volatility rose.

What the data does not show

Position data has no thesis in it. ASIC publishes a net aggregate per stock. It cannot separate a fund betting against Westpac from one hedging a long bank-hybrid position, or from a market-maker offsetting an options book, and rate volatility increases all three. A rising short position is consistent with bearishness about banks, but it does not prove it.

The whole market built. September was a month of rising short interest across the ASX: 149 of the 249 large caps in our screener sample added to their positions. The comparison that matters is against the +0.11pp market average, not against zero. Against that benchmark, the banks, the office and retail REITs, Transurban, APA and the long-duration software names stand out. Consumer retail as a group does not.

One day carries a lot of the move. The 31 August print shows unusually large simultaneous builds in APA, Transurban, Vicinity, NAB, Westpac and WiseTech. It fell on a month-end and on the eve of Australian yields hitting their highest level in 15 years. One large institution adjusting its book can move many names at once, and we cannot tell that apart from many independent decisions.

We cannot isolate the US. The US selloff, the oil shock behind it, Australia's own inflation and the RBA's expected response are all happening at once. Australian yields have risen through US yields, which suggests domestic inflation is doing at least as much work as anything imported. This piece describes positioning during a US bond rout. It does not claim the US bond market caused it.

The currency has not cracked. The version of this story in which a Treasury collapse drags the Australian dollar down, imports inflation and forces the RBA's hand has not played out. The AUD has been firm. If that changes, the transmission gets much faster.

Method

Short positions are the daily net aggregate ASIC publishes with a lag of four business days, as a percentage of shares on issue. The window runs from 21 August to 18 September 2026, the latest position date available when this was written. Moves compare the two end points and are quoted in percentage points. Twelve-month highs are measured on the full-resolution daily series from 19 September 2025. The market benchmark is the simple mean four-week change across 249 ASX stocks with a market capitalisation above A$1 billion in the screener. Group averages are simple means, not weighted by capitalisation. Rates, currency and household-debt figures come from the RBA, ABS and US Federal Reserve (FRED) series held in Shorted's economic data. Live bond yields and market pricing come from the linked sources and are as at 25 September 2026. Full histories for every stock are on their pages, and the weekly movers are in the reports.