UBS, the Zürich-based banking giant, will let some clients who desire to trade bitcoin ETFs do so, subject to some conditions, according to a person familiar with the matter. The conditions, according to the person close to UBS who asked to not be named, include: UBS cannot solicit the trades and accounts with a lower risk tolerance won’t be able to buy them. A UBS spokesperson declined to comment. Citigroup, meanwhile, “currently provides our institutional clients with access to the recently approved Bitcoin ETFs from an execution and asset servicing perspective,” a spokesperson told CoinDesk Thursday. The New York-based bank is “evaluating the products for individual Wealth clients.”