Ann: Kazia announces intention to voluntarily de-list from ASX, page-41

I don't believe you need to have a US Broker if you can engage a suitably qualified Australian broker.

FROM THE ANNOUNCEMENT
"the Company’s Shares will only be capable of being traded on NASDAQ in the form of ADSs, which will require shareholders to transfer their Shares to ADSs to trade on NASDAQ and engage a suitably qualified Australian broker or a US based broker who is able to trade on NASDAQ, or by off-market, private transactions, which will require shareholders to identify and agree terms with potential purchasers of Shares;"