A report from a major investment bank raising the possibility that semiconductor shares have already peaked reopened the argument among analysts. The report also allowed that a further leg of gains might remain.

On the same day, Qualcomm jumped 7.5 percent to lift the Philadelphia semiconductor index, and TSMC's American depositary receipts rose 2.5 percent, even as the broader market fell.

The case for a peak

The peak argument rests mainly on inventory and price cycles: once customers finish restocking after a sharp rise in memory prices, earnings improve more slowly than the expectations already priced into shares.

The opposing case holds that capital spending tied to artificial intelligence differs in character from earlier cycles. Data-centre demand follows corporate investment plans rather than consumer conditions, so the cycle may run longer.

Divergence within the sector

What stands out this week is how widely individual stocks diverge within the same sector. Communications chips, AI accelerators and memory answer to different demand structures, and their earnings paths differ even inside one index.

Analysts therefore warn against judging by the sector index alone. When an index rises while most of its constituents fall, index-following strategies carry greater risk.

Semiconductor shares in Korea and Taiwan have tracked the American market closely, though currency movements and dividend calendars mean the direction is not always identical.

Investment decisions rest with the individual; this paper does not recommend the purchase or sale of any security.