Nasdaq falls 1.25%, Hang Seng drops 1.43%; Shanghai Composite decline covers a longer comparison window

US equities: Nasdaq falls more than the S&P 500

On October 8, the S&P 500 fell 0.47% from its October 7 close, while the Nasdaq Composite fell 1.25%. Both indices use the same closing-price comparison window, confirming that the Nasdaq declined more in this edition. The available data are insufficient to determine which constituent stocks or news drove the difference.

Sources: [1] [2]

Hong Kong equities: Hang Seng falls; technology index data are insufficient

The Hang Seng Index fell 1.43% on October 8 from its October 7 close, moving in the same direction as the two US indices in this edition. However, Hong Kong and US markets close at different times. This observation establishes only that each recorded a decline within its own measurement window; it cannot confirm transmission between the markets.

Sources: [4] [1] [2]

A-shares: Shanghai Composite comparison spans multiple calendar days

The Shanghai Composite fell 0.79% on October 8 from its September 30 close, comparing consecutive available closing records. This measurement window is longer than the October 7–8 window used for US equities and the Hang Seng Index in this edition. These declines therefore cannot be used directly to compare the markets’ relative performance on the same day.

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

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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 complete trading day.
• Whether subsequent closing-price comparison windows for the Shanghai Composite align more closely with those for US equities and the Hang Seng Index, before reassessing differences in gains and losses across markets.
• Once valid records are available for the CSI 300 and Hang Seng TECH Index, whether they move in the same direction as the indices already included for their respective markets.
• Once updated, valid records are available for Bitcoin and Ethereum, establish their comparison windows, then observe how their direction compares with that of equity indices.