I've recently started using IB and I've noticed that the bid/ask prices quoted in the pre-open market are different to what I get from other quote services (both L1 and L2). Can someone confirm where IB's prices are coming from in the pre open market. Thanks Echo
IB pre-open market bid/ask prices show quotes directly from the ECNs, which can be executed against, instantly. Frequently IB ECN direct quotes are ahead of LevelII quotes by half a second, which have to be aggregated first and than rebroadcasted. Fohat