As Vitalik Buterin’s holdings represented a large portion of the circulating supply for some of the tokens, the sales resulted in huge price drops.
Source: https://cointelegraph.com/news/vitalik-dumps-700k-worth-of-shitcoins-that-he-never-asked-for
Vitalik dumps $700K worth of shitcoins that he never asked for
March 8, 2023
CoinTelegraph