SPY: Large Volume Trades and Price Impact


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S&P 500 is showing signs of institutional buying: Buy Imbalance hits +$978.9 million

Following the Big Money in S&P 500 Stocks

So far in trading today, the S&P 500 ETF is up 1.3%. SPY stock last traded at $511.45. Large volume bursts in S&P 500 stocks reached 35.1 million shares worth a total of $6.3 billion in transactions. There was notable buy pressure in the Technology and Consumer Staples sectors. Overall, buy volume pressure outpaced sell volume pressure by a 1.4 to 1 ratio. There were 129 stocks that had more buy pressure on balance, and 107 stocks that had more sell pressure from large institutions. As a whole, there was a net positive +$978.9 million in dollar volume trades. A greater amount of the trading volume occurred on lit exchanges, at 64.5%, compared with 35.5% 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 is +$978.9 million, however, the peak buy imbalance for the day occurred at 1:30 PM, when the net buy dollar volume was +$1.0 billion. The lowest cumulative sell imbalance occurred at 9:45 AM, when the net sell reached -$4.5 million. The largest spike in imbalance came between 1:15 PM and 1:30 PM when the buy pressure outweighed the sell pressure by a 14.4 to 1 ratio.

Flow by Sector

Technology experienced the biggest dollar volume bursts of all the SPDR sectors, with buy dollar volume exceeding sell dollar volume by $842.7 million. 24 of the Technology stocks had positive dollar balance, versus 18 that were net negative.

Individual Stocks

AAPL stock had the single biggest volume burst activity of all the S&P 500 stocks. Buy volume bursts exceeded sell volume by 1.2 million shares. As of this afternoon, the average purchase price on buy volume was $184.78. The stock has rallied $12.30, indicating strength following the trade.