According to Viewbase, currently 1,763M Bitcoin or about 9.5% of its circulating supply is held on centralized exchanges:

Coinbase – 891k BTC
Huobi – 238k BTC
Binance – 148k BTC
OKEx – 122k BTC
Kraken – 100k BTC
Other exchanges – 264k BTC

Noteworthy is that Coinbase wallets hold more BTC than other crypto exchanges combined:

891k BTC vs 872k BTC.

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