May was a month of mixed fortunes for holders of Westpac Banking Corp (ASX: WBC).
Westpac shares began the month near $38.50 and ended it at $36.00, a decline of approximately 6.5%.
That underperformed the broader ASX 200, which rose 0.76% over the same period.
Three distinct events drove the Westpac shares story in May, and each deserves a closer look.
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The ex-dividend date came and went
The most anticipated event for Westpac shares in May was the ex-dividend date.
Westpac went ex-dividend on 8 May 2026, with a fully franked interim dividend of 77 cents per share payable on 26 June.
As is typical with large dividend payers, Westpac shares fell approximately in line with the dividend amount on the ex-dividend date itself.
This is because the value of the upcoming payment is deducted from the share price.
For income investors who already held Westpac shares before 8 May, the 77 cent payment remains on track for the 26 June payment date.
At the current Westpac shares price of $36, a full-year dividend of 155 cents per share implies a forward fully franked yield of approximately 4.3%, or around 6.2% when grossed up with franking credits at the 30% company tax rate.
A court ruling added to the pressure
Westpac shares came under additional selling pressure in May after a court ruling weighed on sentiment.
The nature of the ruling related to a regulatory matter that added to the perception of ongoing compliance risk at the bank.
Westpac has faced a string of regulatory challenges in recent years, and each new development reminds investors of that history.
However, the financial impact of the ruling appears limited, and analysts do not expect it to materially affect near-term earnings or the dividend.
The broader bank sector dragged on Westpac shares
Beyond the company-specific events, Westpac shares suffered from broader sector weakness in May.
The S&P/ASX 200 Banks Index (ASX: XBK) fell 5.33% in May.
Portfolio manager Suhas Nayak from contrarian fund manager Allan Gray stated that ASX 200 bank shares look less attractive today, noting the total returns from here look less appealing than many other parts of the market.
Furthermore, the RBA raised the cash rate by 25 basis points to 4.35% at its May 2026 meeting, its third consecutive hike this year.
While supportive of net interest margins, this hike added to concerns about mortgage stress across the big four banks' home loan books.
Westpac, with approximately 69% of its loan book in residential mortgages, is particularly sensitive to that dynamic.
In addition, the federal budget's negative gearing changes for established properties raised concerns about slower investor credit growth.
This is a headwind that Jarden analyst Matthew Wilson estimated could cut housing credit growth by as much as 25%.
What brokers think about Westpac shares
The broker consensus on Westpac shares is cautious.
Morgan Stanley maintains an underperform rating on Westpac shares with a price target below the current share price.
Macquarie also carries a below-market target on Westpac shares, citing valuation concerns and competitive pressure in the mortgage market.
The analyst consensus target price sits at approximately $34.99, implying modest downside from current levels.
That is not a ringing endorsement, but it does not price in catastrophe either.
Foolish takeaway
Westpac shares had a difficult May.
The ex-dividend fall, a court ruling, sector-wide selling, and negative gearing concerns all converged in a single month.
However, the fully franked 77 cent dividend is still on track for payment in June, and the underlying business posted a solid first-half result with net interest margin improving 3 basis points to 1.81%.
For income investors holding Westpac shares for the dividend rather than capital growth, May's events change little about the core investment case.
