Short sellers have never been more bearish on Australia's big four banks than they are right now.
Hedge funds have amassed a record short position nearing $11 billion against the big four banks. This marks the largest dollar value ever recorded for bets against the sector.
The number of shares lent to speculators has reached levels not seen since 2018, following the Hayne Royal Commission.
For the millions of Australians who hold shares in Commonwealth Bank of Australia (ASX: CBA), National Australia Bank Ltd (ASX: NAB), Westpac Banking Corp (ASX: WBC), or ANZ Group Holdings Ltd (ASX: ANZ), it demands a clear answer to one question: are the short sellers right?
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Who is shorting ASX bank shares and why
The first thing to understand is who is behind this record short position.
Unlike previous bear raids primarily driven by offshore funds betting against Australian property, this current wave is being led by domestic long-short managers. These investors are convinced the banks' profits and valuations are vulnerable to multiple domestic challenges.
The big four shed A$50 billion in combined market cap in May, after Commonwealth Bank suffered its largest single-day plunge on record.
The federal budget housing changes further spooked markets already nervous about rising provisions and stubborn inflation.
The short sellers were positioned for exactly that kind of event.
The bear case explained
Morgan Stanley believes operating conditions for Australia's major banks have "deteriorated rapidly". The broker pointing to three RBA rate hikes, proposed property tax changes, and the global energy shock as pressures landing simultaneously.
Morgan Stanley is now expecting consensus earnings per share forecasts to fall after a soft reporting season.
How? The bear case has four pillars.
First, three RBA rate hikes in 2026 are increasing mortgage stress across the banks' enormous combined home loan portfolios.
Second, the federal budget's negative gearing changes are expected to slow investor credit growth by as much as 25%, according to Jarden.
Third, net interest margins are under pressure from intense deposit competition.
Fourth, and most importantly, the big four bank shares are not cheap.
CBA trades at approximately 26 times forward earnings, a valuation that leaves virtually no margin for error if any of these headwinds intensify.
The bull case still exists for ASX bank shares
Shorting Australian banks has historically been described as a widow maker trade.
The big four remain extraordinarily profitable businesses with irreplaceable market positions, government-backed deposit guarantees, and pricing power in a rising rate environment.
In the first half of FY2026, CBA posted statutory net profit of $5.41 billion, up 5% year-on-year, while paying a fully franked interim dividend of $2.35 per share.
Furthermore, the RBA meets in just five days on 16 June, with markets currently pricing a hold at near-certainty.
A definitive pause signal from the RBA would remove the single biggest near-term headwind weighing on bank shares and could trigger a sharp reversal of the short positions.
ANZ is currently the most favoured among analysts, with six of 16 analysts carrying buy or strong buy ratings and some seeing potential upside of 13% from current levels.
What the record short position actually means
A record short position does not necessarily mean ASX bank shares will fall.
It means a large number of professional investors believe they will fall. And professional investors are frequently wrong.
What the record short position does tell us is that the risk-reward for buying bank shares at current prices is less attractive than at almost any point in the past decade.
The valuations, particularly at CBA, reflect little of that risk. And the smart money is positioned for disappointment.
Foolish takeaway
Ordinary investors do not need to panic about the record short position.
The big four banks are not going to collapse and their dividends are not under immediate threat.
What the short sellers are saying is that the share prices, particularly CBA, have run ahead of the earnings reality.
The RBA's decision on 16 June will be the next significant test of that thesis.
If the RBA holds and signals a pause, the short sellers will feel real pain. If it hikes or signals further hikes ahead, they may have called this one correctly.
