afterhours, which all the other trades had too), and 'Average Price' which is meaningless on dark-pool-reported trades.ĭid the trade occur? Yes. The trade conditions present on the 'spike' trade of 206.815 from a Dark Pool were:įorm T (i.e.

The 15 most subssequent traders were from 17:10:00 through 17:10:57 at prices ranging from 195.75 thorugh 195.85 with volumes ranging from 1 share through to 100 shares from dark pools and NYSE Arca. The 15 most prior traders were from 17:08:45 through 17:09:10 at prices ranging from 195.65 thorugh 195.85 with volumes ranging from 1 share through to 128 shares from dark pools and NYSE Arca. Looking at high-cost instutional-level data feeds shows that NVDA had a single trade for $206.815 at 17:09:38 for 240 shares, performed through a dark pool. Your attachment shows that NVDA closed at $195.94 but spike in after-hours trading above $205 according to one source and not to another.

In the case of NVDA on trade date Jul 22 2021, there were no corporate actions involved (there was a 4:1 stock split a couple of days earlier, but this is unrelated). Some sources will only report a subset of trades. For regular market-hours trading, the rules are well-defined by the Consolidated Tape Association and the UTP Plan.įor after-hours and pre-hours trading, there are no rules regarding trades. Trading errors/spikes are a significant trap for the unprepared, especially when there are corporate actions involved such a dividends, spinoffs, splits etc.ĭifferent sources will include/exclude certain trade conditions and/or exchanges/trading venues.

Answer: something else (it's complicated!)Īfter-hours and pre-hours trading is not subject to any price barriers or halts, and is mostly unregulated accordingly.

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