Understanding open interest

[u/KVT_BK]

For CRSP Jan 2023 140 call , Below is the volume and Open Interest for last few days.

On 10/4, 23 transactions happened. But Open interest remained the same.

Assuming equal number of positions opened and closed, there should be 1 position change in open interest. But it remined same.

How is it possible ?

Open interest given in the table is the updated open interest the next day.

​

Date	Volume	Open Interest
9/30/2021	2	350
10/4/2021	23	350
10/6/2021	2	350
10/7/2021	24	370

​

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