The Index Came Back; Breadth Did Not
On May 25, the Shanghai Composite rose 0.96% to 4,152.57 (Eastmoney Choice, queried 2026-05-26). After the broad 2.04% drop on May 21, two sessions of repair had pulled the index back above 4,100.
But under the index, the repair was narrow. From the May 18 close to the May 25 close, STAR 50 rose from 1,709.96 to 1,896.04, about +10.9%; SSE 50 moved only from 2,934.96 to 2,968.70, about +1.1%; BSE 50 fell from 1,356.95 to 1,316.74, about -3.0%. On May 25 alone, STAR 50 rose about 5.9% (Eastmoney Choice, queried 2026-05-26).
The conclusion is direct: the index recovered, but the repair had one engine.
The Fragility of a Single-Engine Bounce
STAR 50 strength says the AI / semiconductor line was hot. It was also the highest-beta line: down about 3.7% on May 21, then up about 5.9% on May 25. The upside and downside of high beta sit on the same line.
The issue is that other lines did not do much. SSE 50 was near flat, BSE 50 was still down, and ChiNext only followed partway. That kind of repair can pull the index back, but it has little redundancy. If STAR cools, other segments may not be ready to carry the baton.
This is not a forecast of reversal. It is a structural note. Broad rallies have multiple legs. Narrow rallies have one. On May 25, that one leg was strong enough to matter.
The Other Side
The constructive read is that leadership often starts narrow. Capital enters STAR / semiconductors first, then later rotates into ChiNext, CSI 300, or SSE 50.
The cautious read is that a strong single line can drain attention from the rest of the market. BSE 50 was still down and large-cap value barely moved, so the earning effect had not truly spread.
Both readings stand. The evidence says direction recovered, but breadth did not.
Closing
May 25 was a good-looking repair that became narrow once opened up. Shanghai returned to the 4,150 area, STAR 50 led strongly, but most broad indices did not confirm at the same scale.
This backfills the day itself. The May 26 pulses then extend the same arc from three angles: narrow rally, churn in holders, and Nvidia’s silicon bottleneck.
Data sources: Shanghai Composite, STAR 50, SSE 50, CSI 300, ChiNext, and BSE 50 index data from Eastmoney Choice (queried 2026-05-26; window from the 2026-05-18 close to the 2026-05-25 close; Shanghai Composite trading day 2026-05-25).