Nasdaq Falls 1.88%, Shanghai Composite and Hang Seng Also Close Lower on the Same Date: Comparison Windows Differ

Both US Indices Close Lower, with a Larger Decline in the Nasdaq

On October 14, the Nasdaq Composite fell 1.88% from its October 13 close, while the S&P 500 fell 1.11%. Both indices use the same close-to-close comparison window, from October 13 at 20:00 UTC to October 14 at 20:00 UTC. The data in this edition supports the observation that the Nasdaq fell more, but provides no sector or individual stock contributions, so the constituents driving the declines cannot be determined.

Sources: [2] [1]

Shanghai Composite and Hang Seng Both Close Lower, with a Smaller Decline in the Hang Seng

On October 14, the Shanghai Composite fell 0.89% from the previous trading day, while the Hang Seng Index fell 0.13%. The Shanghai Composite's close-to-close comparison window runs from October 13 at 07:00 UTC to October 14 at 07:00 UTC, and the Hang Seng's runs from October 13 at 08:00 UTC to October 14 at 08:00 UTC. Both windows end before this edition's US equity comparison window ends, so these declines can only be compared within their respective trading sessions and cannot be directly interpreted as market reactions at the same moment.

Sources: [3] [4] [2] [1]

No Direct Causal Link Can Be Established Between NVIDIA's Application Announcement and the Index Decline

The summary of NVIDIA's official announcement says semiconductor companies are adopting CUDA-X libraries, including the newly introduced cuPotential, to advance AI-defined fabs. cuPotential can be used to build AI agents that simulate atomic and molecular interactions. This provides specific information about technology applications, but this edition lacks individual stock data for NVIDIA and related companies, so the available information does not establish an explanation for the Nasdaq's decline that day.

Sources: [5] [2]

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What to watch next

• Whether the Nasdaq Composite's decline remains larger than the S&P 500's on the next completed trading day.
• Whether the Shanghai Composite and Hang Seng Index continue moving in the same direction within their respective subsequent close-to-close windows.
• Once valid market data resumes for the CSI 300 and Hang Seng TECH Index, whether they move in the same direction as the indices already covered in their respective markets.
• Once updated comparison windows meeting data quality requirements are available for Bitcoin and Ethereum, examine how their direction differs from that of equities.