$UNI on-chain data changes, the largest holder A16Z transferred 19.2M worth 200 million USD from multiple wallets holding a total of 60.5M to a new wallet.
Personally, I think it is highly unlikely they will sell, but rather it is related to the upcoming new Duna proposal from Uni. If the Uni project team starts to empower Uni tokens, then Uni will take off without looking back.