The sell-off in China’s tech hardware shares through late September and early October 2026 is best read as a repricing of expectations that had run ahead of earnings. Higher global yields, elevated oil prices, and uncertainty about possible new optical-component rules have added pressure. Whether this is only a valuation reset, or an early sign that AI hardware demand will disappoint, is still contested. The most-cited bullish analysis, from DBS Vickers, calls it a “premium reset” and argues that AI infrastructure spending and domestic-chip demand remain supportive. The reported data available as of 9 October 2026 do not settle that question, so this article separates what was measured from what analysts think it means.
What the reported moves show
28 September 2026: a 13-month low for mainland stocks
The South China Morning Post reported that mainland Chinese stocks had hit a 13-month low as technology shares fell. On that session the CSI 300 fell 2.2% and the chip-heavy STAR Market 50 fell 4.1%, while Hong Kong’s Hang Seng Index rose 0.5%. The report linked the decline to elevated global capital costs and oil prices. These are single-session moves for that date. They are not cumulative returns for the selloff, and the Hong Kong gain shows the decline was not uniform across Chinese markets.
8 October 2026: sector ETFs fall more sharply
A commentary republished by Eastmoney, credited to Daily Economic News, said communications, AI, and chip-tracking ETF indices fell sharply on 8 October. Several of the indices were more than 5% lower that day, and others were down more than 4%. The commentary attributed the pressure to overseas macro conditions and policy uncertainty about future optical products.
The same commentary addressed a possible rule on 3.2T optical modules. It described that rule as speculative and said its near-term effect on 800G and 1.6T products was expected to be limited. That is the commentary’s assessment, not an enacted policy. Readers should treat the rule as an open risk rather than a settled change to the market.
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The July drawdown in the UBS summary
A UBS strategy report dated 11 August 2026, as summarized by Hilo Research, put the earlier correction in longer context. It reported that tracked Chinese AI hardware stocks fell sharply in July, with a large share of names dropping 40% or more. The same summary described margin financing in A-shares as having fallen from its peak, and said valuations were only slightly above historical averages while earnings-per-share forecasts kept rising. Because this is a secondary summary, the figures should be attributed to UBS as relayed by Hilo Research. They have not been checked against UBS’s original report or underlying exchange data.
Why valuations are under pressure
The core issue is that share prices appear to have assumed several things at once: that Nvidia’s latest products would stay out of China, that policy support would turn smoothly into corporate profits across a broad group of listed companies, and that AI spending would keep accelerating. When any of these assumptions looks shaky, high-multiple stocks tend to fall further than the underlying businesses.
Macro conditions made that adjustment harder. The 8 October commentary pointed to higher oil prices and US long-term yields as drags on growth-stock valuations. Higher yields reduce the present value of earnings that are expected far in the future, which is why the effect falls hardest on companies whose valuations depend on long-dated growth. The 28 September report connected the same forces to weaker risk appetite.
Rates, oil, and policy signals can change within days. Any valuation reading tied to them is only as current as its date.
The case that this is a valuation reset
DBS Vickers Chief Investment Office analyst Yeang Cheng Ling wrote on 7 October 2026 that the pullback was a “premium reset, rather than a break in thesis.” DBS said the market had priced in both continued exclusion of Nvidia’s newest products from China and a smooth conversion of policy support into profits. It described those assumptions as tested by several developments: reports that Beijing was surveying demand for newer Nvidia products, geopolitical uncertainty around optics, inventory levels, and share unlocks.
DBS pointed to operating indicators it said were still tight. It cited rising Chinese hyperscaler capital spending, strong domestic AI-chip activity, national intelligent-computing capacity growth, high data-center occupancy, and very high utilization at the domestic foundry SMIC. It also cited price increases by domestic GPU vendors in September. These are DBS’s figures and interpretations. The underlying datasets were not independently verified, and the figures come from different measures and periods.
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DBS’s advice is to be selective rather than absent. Yeang Cheng Ling wrote that “the right stance, therefore, is selective participation rather than absence.” That is an investment opinion from one firm, not a consensus view.
The case that expectations may be too high
The bearish reading does not require AI demand to vanish. It requires that the gap between sector-level demand and company-level profit is wider than current prices assume. The risks named across the sources point in that direction:
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- Uncertain AI commercialization. Strong infrastructure spending does not guarantee that cloud and AI services earn enough to justify the capital being spent.
- Delayed domestic GPU supply. If domestic chips arrive late, rising prices may reflect scarcity rather than healthy demand that can be sustained.
- Leverage-driven selling. When margin balances fall quickly, forced selling can push prices below levels that fundamentals alone would imply, and can also reflect investors reducing risk.
- Data-center construction shortfalls. If construction lags planned capacity, the revenue suppliers expect may arrive later than their valuations assume.
- Inventory and share unlocks. DBS flagged these as pressure points, because supply that builds up or becomes tradable can weigh on prices even when demand holds.
How to test the two readings yourself
The two interpretations predict different things in company filings over the next several quarters. A valuation reset shows up as falling multiples while earnings forecasts keep rising and reported revenue and cash flow follow. A demand warning shows up as earnings revisions turning down, shipments not converting into accepted revenue, and inventories or supplier prepayments rising without matching orders.
- Check whether revenue and profit follow the spending. In company reports, compare revenue growth and gross margin with the capital spending that is supposed to drive it.
- Compare shipments with accepted revenue. Shipments that are returned, held in inventory, or booked only as prepayments are weaker evidence than recognized sales.
- Look at order backlog. DBS suggested server backlogs as a way to corroborate orders. A backlog that is growing and being worked off is a stronger signal than announced capacity.
- Track earnings revisions, not only the level of estimates. A forecast that is high but still being raised differs from one that is high and being cut.
- Measure valuation against history and peers. Compare forward multiples with the company’s own range and with listed peers, and note whether the sector is trading above or near its historical average.
- Watch the macro inputs. US long-term yields and oil prices affect growth-stock multiples directly, so a stock can fall even if its operations are unchanged.
- Monitor margin financing and policy status. Leverage levels show how much forced selling could still occur. Optical-component rules should be tracked as proposals until an official text is published.
How the sources differ
The three main sources answer different questions, and they use different universes and periods. Read them as separate observations rather than one combined dataset.
| Source | Date | What it covers | Main limit |
|---|---|---|---|
| South China Morning Post | 28 September 2026 | Index moves in mainland and Hong Kong markets on one session | Single-day moves; not cumulative returns |
| Eastmoney, republishing Daily Economic News commentary | 8 October 2026 | Declines in communications, AI, and chip-tracking ETF indices; policy and macro attribution | Commentary; the optical-rule discussion is speculative and not enacted policy |
| DBS Vickers Chief Investment Office (Yeang Cheng Ling) | 7 October 2026 | Operating indicators, supply-chain tightness, and the “premium reset” interpretation | Institutional investment view; underlying datasets not independently verified here |
| UBS strategy report, as summarized by Hilo Research | 11 August 2026 (report date); July market data | July drawdown, A-share margin financing, valuation versus history, and risk list | Secondary summary; not checked against the original report |
No regulator, court, or company statement directly on this market move was identified in the sources. The analyst views above should not be read as official positions of any government or listed company.
What would settle the question
The selloff will not be resolved by one more session of price action. It will be clearer when reported company results show whether demand turns into recognized revenue and cash, whether earnings forecasts start being cut, and whether policy on optical components and export controls becomes official. Until then, the most accurate reading is that prices have fallen faster than the operating evidence has weakened, and that the analysts disagree about how much of the decline reflects a lasting change in expectations.
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