Two U.S. stock indexes close slightly higher; Shanghai Composite and Hang Seng also gain in their latest sessions

Both U.S. indexes rise, with a smaller gain for the Nasdaq

In the completed October 1 session, the S&P 500 rose 0.19% and the Nasdaq Composite rose 0.04% from their September 30 closes. Both indexes moved in the same direction, but the Nasdaq gained less. These two indexes alone are insufficient to determine whether gains extended to a broader range of stocks.

Sources: [1] [2]

Shanghai Composite and Hang Seng observations extend only through September 30

In this edition’s data, September 30 is the latest completed trading day for both the Shanghai Composite and the Hang Seng Index. Compared with their September 29 closes, the Shanghai Composite rose 0.31% and the Hang Seng Index rose 0.37%. Both closed higher on the same trading day, but their records do not share the October 1 date of the U.S. data and cannot be combined into a single simultaneous advance.

Sources: [3] [4]

NVIDIA’s announcements focus on inference speed and infrastructure uses

NVIDIA’s official announcement summaries introduce GPT-6 Astra Ultrafast running on Blackwell GPUs and discuss returns on investment in AI factories. An original post from its official account describes infrastructure flexibility as the ability to support different models, AI tasks at different stages, and non-AI workloads. These materials offer points to examine at the product and infrastructure levels. The evidence in this edition is insufficient to establish a causal link between them and index movements.

Sources: [5] [6] [7]

Related news and discussion

• How NVIDIA GPUs Help Accelerate OpenAI’s GPT-6 Astra Ultrafast

  NVIDIA’s official announcement summary says GPT-6 Astra Ultrafast, running on Blackwell GPUs, is available through the OpenAI API and to eligible ChatGPT Work and Codex users. It also claims token generation speeds of up to eight times those of Astra Standard mode. This performance claim comes from the publisher’s summary and has not been independently verified for this edition.

  2026-10-02 07:44 (UTC+8) Read the source

• Productive, Durable, Fungible: How NVIDIA AI Factories Maximize Return on Investment

  NVIDIA’s official announcement summary discusses the construction costs and investment returns of AI factories. It says operators need clear return expectations before committing substantial capital and identifies profitability as one factor affecting returns. The summary does not fully explain the other factors.

  2026-10-01 21:00 (UTC+8) Read the source

What to watch next

• Whether the S&P 500 and Nasdaq Composite continue moving in the same direction in the next completed trading session, and whether the Nasdaq’s gain remains smaller than the S&P 500’s.
• Once new completed-session records become available for the Shanghai Composite and Hang Seng Index, compare each index’s change between consecutive closes.
• Once valid records become available for the CSI 300 and Hang Seng TECH Index, assess whether they move in the same direction as the indexes already covered in their respective markets.
• Once updated, usable Bitcoin and Ethereum prices become available, assess changes within a clearly defined comparison window for each.
• Whether subsequent official announcements provide inference performance test conditions and actual operating data on returns from AI infrastructure investment.