Why do they sell and buy almost the same quantity on same day and that too same amount?

I was researching and the trades of some shares and when I see bulk deals, most the big entities bought and sold same amount of quantity on same value

How does it works? Am I missing something here?

Someone care to explain?

I was researching and the trades of some shares and when I see bulk deals, most the big entities bought and sold same amount of quantity on same value

How does it works? Am I missing something here?

Someone care to explain?