According to Viewbase, currently, 20.2M Ethereum or about 17.3% of its circulating supply is held on centralized exchanges:

Coinbase – 7.5m ETH
Binance – 3.5m ETH
Gemini – 2.1m ETH
Kraken– 2.1m ETH
Bitfinex – 1.6m ETH
Huobi – 1.5m ETH
Other exchanges – 1.5m ETH

Noteworthy is that Coinbase and Binance hold more ETH than other crypto exchanges combined: 11m ETH vs 9.2m ETH.

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