Approximately 6.25% of mined Bitcoins are in Xapo wallets

According to Bloomberg, two customers of Xapo have estimated that the company has approximately 1,000,000 BTC deposits worth of $10 billion. Hong-Kong based Bitcoin wallet provider is holding this wealth in underground bunkers on five continents, including one in a decommissioned Swiss military bunker.

Video and pictures bellow:

https://www.bloomberg.com/news/articles/2018-05-09/bunkers-for-the-wealthy-are-said-to-hoard-10-billion-of-bitcoin

https://news.bitcoin.com/xapo-estimated-housing-6-25-btc-supply/