Crypto investment firm Nickel Digital Asset Management has around $12 million of its funds' capital stuck on FTX after the exchange halted client withdrawals and filed for bankruptcy protection. 

That figure amounts to about 6% of its $200 million in assets under management, founder partner and chief investment officer Michael Hall said at the City & Financial Global conference in London. Around a third of Nickel Digital's funds on FTX were insured, he added.