There have been several such movements in recent months, and I interpret them as people who are loaded, who have been waiting a long time for Bitcoin to reach a certain figure, such as passing $100,000, and who were perhaps hoping at the start of the year that the price could go much higher. Three quarters of the year have passed, and seeing that the price has not taken off completely, they have decided to sell. If you have had all those bitcoins for a long time, you make a huge profit. Besides, I am sure that these types of people have more bitcoins stashed.