If your account has been approved for trading fractions and a US corporate action issues fractional shares, the fractional shares will remain in your account. However, if your account does not have permissions to trade in fractions or the corporate action is issuing non-US shares or non-eligible US shares the fractional shares will be liquidated. The processing of the liquidation will typically be done within one day of the processing of the action.

Please be aware that IBKR holds all positions in street name. As such, corporate actions which may include a round up privilege whereby a broker may request that each holder of a fractional position be rounded up will not be supported by IBKR. All such actions which result in a fractional share will be liquidated as cash. The resulting cash will be the equivalent to the value of the resulting fractional shares.