Noteworthy Thursday Option Activity: OSIS, PFE, U

Looking at options trading activity among components of the Russell 3000 index, there is noteworthy activity today in OSI Systems, Inc. (OSIS), where a total volume of 1,015 contracts has been traded thus far today, a contract volume which is representative of approximately 101,500 underlying shares (given that every 1 contract represents 100 underlying shares)..