[HighFreqAsuka]

By having nearly no volume to begin with. Many US stocks are listed across many of the ~13 US exchanges, so what you're describing is already the status quo. According to RegNMS regulations, traders cannot trade through protected quotes, and so trading firms already have to be aware of the prices on all US exchanges.

But LSTE has so little volume, that you frankly forget they exist most of the time.

[lopatin]

The exclusivity and (assumed) low volume is what made me think of arb opportunities in the first place :) I doubt I'll be getting an invitation to trade.

[eej71]

I haven't tried, but I believe that upon request, your brokerage firm will direct trades to LTSE or any venue of your choosing.