With the stock trading just under 26 I would buy the August 26 puts for $2.25 here. I think you could get a quick move down in this name especially if the broader market continues lower towards 850 during July, as I tend to think will happen.
I would cut losses quick if MS got above 27.50 as that would be above that neckline which is now resistance. On the downside I am targeting 21 as that is the 200 day ma and should provide some support.
You could also look at selling a call spread at perhaps the 28/30 line if you want to take less risk, however I like the put play since it could be a quick sell and the broad market is feeling heavy here as well.