BitMEX has seen the amount of Bitcoin held on the exchange drop 315,000 to 240,000 BTC in the past few weeks
Source: https://cointelegraph.com/news/btc-held-by-bitmex-fell-25-after-mass-liquidations
BTC Held by BitMEX Fell 25% After Mass Liquidations
April 2, 2020
CoinTelegraph