According to Viewbase, currently 26,81M Ethereum or about 23.7% of its circulating supply is held on centralized exchanges:

Coinbase – 8.52m ETH
Bitfinex – 5.27m ETH
Huobi – 3.26m ETH
Binance – 2.95m ETH
Kraken – 2.43m ETH
Other exchanges – 4.38m ETH

Noteworthy is that Coinbase and Bitfinex hold more ETH than other crypto exchanges combined: 13.79m ETH vs 13.02m ETH.

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