The Mr100 whale accumulated 3000 BTC in the recent dips and suddenly sold 6k BTC today.

The Mr100 whale accumulated 3000 BTC in the recent dips and suddenly sold 6k BTC today.

Correct me if I’m wrong but Mr100 is a stock exchange. Right?
I don't know, I know he's a whale and he's the 12th bitcoin holder.
“Mr100” is believed to belong to an exchange. According to blockchain intelligence firm Arkham Intelligence, the Mr100 wallet has been tagged as a cold wallet associated with the Upbit cryptocurrency exchange. This conclusion is supported by the analysis of blockchain data, which shows that the incoming transactions to the Mr100 wallet originate from Upbit
Thus outflow of BTC makes absolutely sense.
Others have followed that tx and deemed it a transfer