Expo Holdings Inc. (EXPH)

[Sud13]

I use Zecco and Yes, they do allow market orders on pinksheet and OTC stocks, but the quantity should be less. It cannot be for 100K or a million shares....this is because there is a huge risk in keeping market order for the large quantity and that's why they restrict it. But Scottrade doesn't allow market order for pinksheet stocks even for a single share.

I hope this helps!