SPY: Large Volume Trades and Price Impact


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S&P 500 has seen increased institutional buying: Buy Imbalance hits +$870.3 million

Following the Big Money in S&P 500 Stocks

So far in trading today, the S&P 500 ETF is up 0.4%. SPY stock last traded at $553.94. Large volume bursts in S&P 500 stocks reached 25.0 million shares worth a total of $4.6 billion in transactions. There was notable buy pressure in the Communication Services and Technology sectors. Overall, buy volume pressure exceeded sell volume pressure by a 1.5 to 1 ratio. There were 80 stocks that had more buy pressure on balance, and 73 stocks that had more sell pressure from large institutions. As a whole, there was a net positive +$870.3 million in dollar volume trades. A greater amount of the trading volume occurred on lit exchanges, at 76.8%, compared with 23.2% 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 buy imbalance of +$870.3 million occurred at 2:15 PM. This also represented the peak buy imbalance for the day. The largest spike in imbalance came between 10:15 AM and 10:30 AM when the buy pressure outweighed the sell pressure by a 2.9 to 1 ratio.

Flow by Sector

Technology had the most dollar volume bursts of all the SPDR sectors, with buy dollar volume exceeding sell dollar volume by $318.7 million. 17 of the Technology stocks had positive dollar balance, versus 15 that were net negative.

Individual Stocks

NVDA stock had the single biggest volume burst activity of all the S&P 500 stocks. Buy volume bursts outpaced sell volume by 1.0 million shares. As of this afternoon, the average purchase price on buy volume was $127.51. Despite the buy pressure, the stock has dropped $0.90 on the day.