You guys may have heard this before, but Etrade is by far the best on pinks. Usually the day a stock comes off the expert market, it is tradeable online (I just placed an order on WRMA to be sure).
I had to move away from TDA many years ago because I'd do all this work researching a stock and then I'd go to trade and they said I had to call in, or sometimes wouldn't allow me to trade it at all. And it was totally random, even some listed stocks, not just pinkies.
Before the whole expert market fiasco, Etrade would let me trade anything on the OTC, never a problem. Now, they only allow closing trades on expert market stocks (can be done online), but can't buy them
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