SPY: Large Volume Trades and Price Impact


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S&P 500 has seen increased institutional selling: Sell Imbalance hits -$1.4 billion

Following the Big Money in S&P 500 Stocks

So far in trading today, the S&P 500 ETF is unchanged. SPY stock last traded at $547.33. Large volume bursts in S&P 500 stocks reached 62.2 million shares worth a total of $9.2 billion in transactions. There was notable buy pressure in the Health Care and Consumer Discretionary sectors. Overall, sell volume pressure exceeded buy volume pressure by a 1.4 to 1 ratio. There were 137 stocks that had more buy pressure on balance, and 110 stocks that had more sell pressure from large institutions. As a whole, there was a net negative -$1.4 billion in dollar volume trades. A greater amount of the trading volume occurred on lit exchanges, at 71.9%, compared with 28.1% being transacted in the dark pool. To learn more about large volume trades, check out our help section.

Daily Chart: Large Volume Bursts Over Time

As you can see from the chart below, the most recent cumulative sell imbalance is -$1.4 billion, however, the furthest sell imbalance for the day occurred at 1:45 PM, when the net sell dollar volume was -$1.5 billion. The highest cumulative buy imbalance occurred at 9:45 AM, when the net buy hit +$271.1 million. The largest spike in imbalance came between 12:15 PM and 12:30 PM when the sell pressure surpassed the buy pressure by a 10.2 to 1 ratio.

Flow by Sector

Technology had the largest dollar volume bursts of all the SPDR sectors, with sell dollar volume exceeding buy dollar volume by $1.7 billion. 22 of the Technology stocks had positive dollar balance, versus 27 that were net negative.

Individual Stocks

NVDA stock had the single biggest volume burst activity of all the S&P 500 stocks. Sell volume bursts exceeded buy volume by 11.1 million shares. As of this afternoon, the average trade price on sell volume was $135.33. The stock has fallen $3.19, indicating weakness following the trade.