Notable Monday Option Activity: RIOT, MAC, FLGT

Among the underlying components of the Russell 3000 index, we saw noteworthy options trading volume today in Riot Blockchain Inc (RIOT), where a total of 49,005 contracts have traded so far, representing approximately 4.9 million underlying shares. That amounts to about 56.1% of RIOT's average daily trading volume over the past month of 8.7 million shares..
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