I have just learned that what IB shows in shortable positions is not necessarily what is available. "Clients should be aware that based on the manner in which IBKR is required to execute a close-out [...] may be especially pronounced in the case of illiquid securities. Clients should be aware of these risks and manage their portfolio accordingly" https://ibkr.info/article/845 Does anyone know how the IB algo works? at what time does it liquidate positions and is there a possibility of asking them to delay this to do it manually? Does the algo liquidate indiscriminately, lifting wide bids and offers if less liquid markets at the expense of their clients?