Hi ET, What do entries without venue names next to them represent in the order book? Are these dark routes, IBKRATS internalized routes, ECNs, or something else? I have seen exchange names that IB does not support identified in DOM before so figure it must be something else. See attached screenshot of IB BookTrader, symbol TWLO (NYSE), taken today during regular trading hours. The highlighted entry of 1500 shares @ the $125.88 ask. I have seen this phenomenon in other platforms as well (TOS, etc) so figure it is not IB specific. Thanks for your wisdom and have a great weekend!