A Collateralized Loan Obligation (CLO) is a form of structured credit whereby the issuer uses funds received from the issuance of debt and equity to acquire a diverse portfolio of senior secured bank loans. IBKR does not offer trading in CLOs directly, however, there are a variety of Exchange Traded Funds and Closed End Funds that invest in CLOs and are available to trade.
While IBKR does not offer investment guidance or advice, simple website searches can provide lists of such securities and the exchanges they are traded on which can then be investigated via the Contract Search tool for availability.