Unusual put activity ~26:1 over calls is being seen in diversified insurance provider Arch Capital Group Inc, $ACGL , -$0.27 to $74.68 which is primarily being driven by activity on the September 15th 70.00 put.
Volume on this contract is 1,918 versus open interest of 363, indicating a fresh positioning.
The bulk of the transactions consisted of various-sized blocks that were being bought around the same time at the ask price of $0.65 each, which suggests a bearish intent.