Citing a Twitter user Alex Sunnarborg, Vitalik's main ETH address is currently Ethereum's 24th largest at about 350,000 ETH.
"Vitalik currently owns $50,000,000 worth of ETH in main address + $40,000,000 he cashed out of ETH + additional ETH, tokens, equity, etc," his tweet reads.
Vitalik Buterin responded, "My fiat holdings are well under $30m. You likely overestimated due to (1) all prices generally being on the high side, eg. I definitely never cashed out anywhere close to the $915 level, (2) forgetting charity donations (~$8m I believe)."