More symbolic than anything - saves some listing fees as long as IEX stays free for listing and issuance of new shares. NYSE used to be prestige place to list and also the most expensive - listing fees are a big part of overall NYSE revenue. NASDAQ became competitive and NYSE adjusted their fees to stay competitive. This has little to do with what trades where. Brokerage houses all wish listings were all where they could interact on a principal basis. That IPO day you see on CNBC costs about $1MIllion or more on NYSE. Less on NASDAQ. If you start to see an IPO list IEX that would be a major change. Again nothing to do about where it trades. Think back to the days when "NYSE" stocks only traded NYSE, etc. Those days are gone.