SPY: Large Volume Trades and Price Impact


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S&P 500 is showing signs of institutional buying: Buy Imbalance hits +$772.2 million

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 $543.95. Large volume bursts in S&P 500 stocks reached 32.2 million shares worth a total of $4.3 billion in transactions. There was notable buy pressure in the Technology and Communication Services sectors. Overall, buy volume pressure exceeded sell volume pressure by a 1.5 to 1 ratio. There were 91 stocks that had more buy pressure on balance, and 95 stocks that had more sell pressure from large institutions. As a whole, there was a net positive +$772.2 million in dollar volume trades. A greater amount of the trading volume occurred on lit exchanges, at 66.0%, compared with 34.0% 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 +$772.2 million, however, the peak buy imbalance for the day occurred at 12:00 PM, when the net buy dollar volume was +$854.4 million. The lowest cumulative sell imbalance occurred at 9:45 AM, when the net sell reached -$38.1 million. The largest spike in imbalance came between 11:00 AM and 11:15 AM when the buy pressure outweighed the sell pressure by a 7.3 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 $669.0 million. 15 of the Technology stocks had positive dollar balance, versus 19 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 exceeded sell volume by 4.4 million shares. As of this afternoon, the average purchase price on buy volume was $123.47. The stock price increased $6.65, indicating strength following the trade.