Friend of mine runs a small publishing corporation. Few yrs ago she tried to open a trading account at TDWaterhouse in the name of her company. You wouldn't BELIEVE the extra paperwork. I don't think the brokerage firm would allow you to not be responsible for your trading losses no matter whether you're a sole proprietor or a corporation. Taxation  pros and cons are a different issue and you could look that up -- I'm in Canada so can't say.

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