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Unusual Option Volume

RIO Rio Tinto PLC85.38+1.66 (+2.0%)

Rio Tinto PLC trades 6,748 contracts.
Unusual Option Volume

RIO Rio Tinto PLC89.45-0.87 (-1.0%)

Rio Tinto PLC trades 4,981 contracts.
Unusual Option Volume

RIO Rio Tinto PLC95.03+0.82 (+0.9%)

Rio Tinto PLC trades 6,299 contracts.
Unusual Option Volume

RIO Rio Tinto PLC95.91+1.75 (+1.9%)

Rio Tinto PLC trades 5,368 contracts.
Unusual Option Volume

RIO Rio Tinto PLC98.22+2.43 (+2.5%)

Rio Tinto PLC trades 3,719 contracts. The highest volume is in the 16-Oct-26 87.5 puts.
I noticed a lot of bearish pressure coming from the options market on $RIO. Check out this order imbalance! -179 K option volume delta. What is option volume delta?
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