On the evening of May 30th, S&amp;P Dow Jones Indices announced that their website was undergoing maintenance and was currently inaccessible. Prior to this, some users reported that starting from 22:41 Beijing time (10:41 Eastern Time), the S&amp;P 500 Index and the Dow Jones Industrial Average were not updating real-time quotes, causing investors to be unable to access the latest index data. The related major stock index futures trading was also affected.
Furthermore, some media outlets reached out to the Chicago Mercantile Exchange (CME) in the United States to verify and confirm the authenticity of this news. CME stated that they are actively working to resolve this issue in order to restore real-time pricing data for the indices as soon as possible.
Later, around 0:01 Beijing time, according to the latest reports from the media, the functionality of the Dow Jones Industrial Average quotes has returned to normal, while the S&amp;P 500 Index quotes remained at the 22:41 Beijing time level.
In terms of market reaction, despite the interruption in pricing data for the S&amp;P 500 Index and the Dow Jones Index, actual trading activities were not affected, and the market continued to operate. For example, trading of broad-based funds like the SPDR S&amp;P 500 ETF Trust (SPY) was actively ongoing.
It is worth noting that the data interruption may have temporarily impacted market dynamics and trading behavior. Analysis suggests that the index data transmission interruption coincided with the market reaching its lowest point of the day. This may indicate that at a time when the market was most unstable and potentially in need of data support, market participants were unable to access crucial index information. The data interruption may have triggered panic selling by some market participants, leading to a brief market downturn.
However, data shows that following the data interruption and the market low point, the futures market began to rise. Analysis suggests that this could be due to a perception that once the market felt the decline was excessive, it may have triggered buying signals, resulting in a rapid market rebound.
Real-time market data is crucial for trading operations, as stated by Michael Beth, Director of Stock and Derivatives Trading at WallachBeth Capital LLC: &#34;Market data is a very important part of our daily operations. It's always challenging when we can't see real-time updates.&#34;

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As the three major US stock indexes fell together, real-time pricing data for the S&P 500 and Dow Jones stopped updating at 22:41 Beijing time, leaving investors unable to access real-time data. Analysis suggests that the data interruption may impact short-term market behavior. Firstly, the interruption in index data occurred precisely at the market's lowest point of the day, which may indicate the spread of panic sentiment. Secondly, following the data interruption and the market's low point, the futures market began to rise, potentially signaling that the market is becoming accustomed to data interruptions

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The Dow Jones Industrial Average and the S&P 500 Index briefly halted quoting at one point, then resumed, leading to a rebound in the U.S. stock market