A stock may experience above-average trading volume when important new information affecting the stock's valuation is made known to the public. Normally 3-4 times the normal volume would qualify as unusual. An unusual unit of measurement is a unit of measurement that does not form part of a coherent system of measurement; especially because its exact quantity may not be well known or that it may be an inconvenient multiple or fraction of a base units.. Unusual definition, not usual, common, or ordinary; uncommon in amount or degree; exceptional: an unusual sound; an unusual hobby; an unusual response. See more. Unusual Call Options Activity on 6/15/2020 The companies listed below have had the largest call option volume relative to their average daily volume during the most recent trading day. If the volume exceeds open interest, you know it is a new opening position, which has more informative value than a closing position. Here is a scanner that will help you screen for stocks with unusual volume in ThinkorSwim. The volume for the underlying equity gives an indication of the strength of the current market direction, while the open interest for the put or call tells you the number of option contracts that are currently "open" (not yet liquidated). More about call … Another screen we employ is to compare volume to open interest. Stocks with Unusual Volume Volume mover stocks are companies with the most shares traded during the current trading day relative to their average trading trading volume. When a stock suddenly increased or decreased in trading volume, that means it's being traded at an unexpectedly high level and a lot of traders often take advantage of this.

Options with unusual activity highlight puts and calls for stocks that have a high volume-to-open interest ratio. Open interest represents exiting positions outstanding that still need to be closed. Trading volume is a measure of how much of a given financial asset has traded in a period of time.

source: thinkorswim As you can see from the giant cyan (blue-green) volume bar, there were an unusual amount of options traded on the March 17.5 calls in Delphi, which is much higher than the fuchsia (pink) theoretical line on the graph would predict.