The thinly traded OTCB and pinksheets are prime targets for manipulation by crooked CEOs, trading groups, and shorters as well.
When I think about it, given the high probability that most companies around here are scams of some kind, or at the least woefully underfunded, you can hardly blame shorters for taking the easy route. After all, if 90% of pennies are destined to collapse, their odds of their making a profit on any given trade are much higher than ours as longs.
Penny stock longs must be the real lunatic risk takers. On some days it feels like fewer than 1 in 10 trades held for more than three days turns out profitably. Dilution is another risk for anyone holding a pennystock even overnight..
Scalping and trading for a few hours is, imho, starting to look more and more attractive.
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If you take anything I say as advice, you're crazier than I am.