In a recent article, Bitcoin research company BTCparser said that a large number of Bitcoin wallet addresses were created in 2010, each holding 50 Bitcoins, and these addresses were not transferred until the first "activation" in November 2019. The article calls it the "2010 whale."
Its theory suggests that Satoshi Nakamoto owns these wallets and has been slowly selling his holdings while deliberately ignoring the 2009 wallets to avoid attention, "which makes me suspect that the mysterious 2010 whale may actually be Satoshi Nakamoto."
However, BTCparser emphasized that this is just a "theory, not a conclusion." (Cointelegraph)