Penang's semiconductor packaging boom is real. The orders are real. The capex is real. The jobs are real. So is the customer concentration that nobody mentions when they describe the boom.
We looked at the disclosed customer lists of four major Penang packaging operators. Across the four, the top three customers account for between 58% and 74% of revenue. In one case, a single customer accounts for over 40%. That is not a customer relationship. That is a hostage situation, dressed up as a partnership.
When concentrations are this high, two things follow. The customer has pricing power that compounds over time. The supplier has limited ability to walk away from any term, however unfavourable. And the relationship works beautifully right up until the moment the customer's own demand environment changes. At that point, the supplier learns what concentration means in practice.
The current global semiconductor cycle is not at peak. It is past it. The leading indicators are softening. Some of the largest end-customer buyers are guiding cautiously. The Penang operators that staffed up and invested heavily for the assumed demand environment are going to discover, sometime in the next eighteen months, that the demand environment has shifted.
The operators that are diversifying their customer base now will be fine. The ones that are not, because they cannot, because their top customer's contract prevents them from working with competitors, will not be fine. The conversation about customer concentration is going to be a loud one by mid-2027. Right now it is a whisper. Listen to the whisper.
