Some unusual put activity (better than 7:1 over calls) is being seen in Shift4 Payments Inc. ( $FOUR + $1.97 to $55.96) which is primarily being driven by a 2,943 contract block that was bought on the September 15th 50.00 put at the ask price of $1.55 (open interest is 2,109).
We know that this block is a new position based on the open interest figure and we can assume that the intent is bearish in nature since the trade took place at the ask price.
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