According to Viewbase, currently, 1.53M Bitcoin or about 7.3% of its circulating supply is held on centralized exchanges:

Coinbase – 623k BTC
Binance – 315 BTC
Bitfinex – 190k BTC
Huobi– 107k BTC
Kraken – 102K BTC
OKex – 59k BTC
Other exchanges – 135k BTC

Noteworthy is that Coinbase and Binance hold more BTC than other crypto exchanges combined: 938k BTC vs 593k BTC.

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