What Is The Difference Between A Block And A Sweep?

A block trade is, as the name suggests, a single large order that hits the Unusual Options Activity Tape all at once. 

A Sweep is a large order that is broken up and hits the tape in many different small orders. 


Here is an example of Block Trade: 

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And here is an example of a Sweep ( admittedly not the biggest one) but note how it was broken up.

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