Quote from newguy05:
but it still doesnt protect against overnight risk. My biggest fear of pair trading is what happens when one leg gaps overnight due to blackswan / news. Sure your stop loss will be hit in the morning when market opens but you will already be down/blown up, especially considering most of the pairtrading are pretty leveraged to make decent profit as they are considered hedged/market neutral.
How do you protect against something like that? Only thing i can think of is to trade very stable company pairs like pepsi/coke etc..where the chance of such event is minimal.
I don't trade stock pairs during earnings, I like etf pairs for the reasons you listed, as well as pairs 2 securities of the same company, adr's, common vs b shares etc.