October 13 Close: Hang Seng and Shanghai Composite Edge Up, S&P 500 and Nasdaq Slip

Both U.S. Indices Fall, with a Larger Decline in the Nasdaq

On October 13, the latest complete trading day, the S&P 500 fell 0.02% from its October 12 close, while the Nasdaq Composite declined 0.15%. Both indices moved in the same direction, with the Nasdaq posting the larger decline; the performance of specific sectors or individual stocks cannot be determined from these two indices alone.

Sources: [1] [2]

Hang Seng and Shanghai Composite Rise; Cross-Market Comparisons Must Account for Different Closing Times

Comparing the October 12 and October 13 closes, the Hang Seng Index rose 0.31% and the Shanghai Composite gained 0.10%, moving in the opposite direction to the two U.S. indices covered in this edition. Although the markets use the same trading dates, their closing times differ: the measurement windows for the Shanghai Composite, Hang Seng, and U.S. indices end at 07:00, 08:00, and 20:00 UTC on October 13, respectively. The data therefore confirms that the listed indices diverged, but it cannot establish that they reacted in opposite ways to the same event.

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

NVIDIA Announcement Provides Product Information but Cannot Yet Explain Index Moves

The summary of NVIDIA's official announcement describes RTX Spark as combining gaming, content creation, and personal AI computing capabilities, and lists up to 128GB of unified memory and 1 petaflop of AI computing performance. These are the publisher's descriptions of the product. This edition has no market data for NVIDIA shares or related sectors, so this information cannot explain the Nasdaq Composite's decline.

Sources: [6] [2]

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What to watch next

• Whether the Hang Seng and Shanghai Composite continue to move in the opposite direction to the two U.S. indices on the next complete trading day.
• Whether the Nasdaq Composite's decline remains larger than the S&P 500's on the next complete trading day.
• Once valid closing data is available for the CSI 300 and Hang Seng Tech Index, whether each moves in the same direction as the index already included for its respective market.
• Once valid comparison windows are updated for Bitcoin and Ethereum, review their gains and losses and clearly identify how those windows differ from the stock market closing periods.