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If I believe a stock is going to fall, what options do I have to invest on this?
Aganju has mentioned put options, which are one good possibility. I would suggest considering an even easier strategy: short selling.  Technically you are borrowing the stock from someone and selling it.  At some point you repurchase the stock to return to the lender ("covering your short").  If the stock price has fallen, then when you repurchase it, it will be cheaper and you keep the profit. Short selling sounds complicated but it's actually very easy--your broker takes care of all the details.  Just go to your brokerage and click "sell" or "sell short."  You can use a market or limit order just like you were selling something you own.  When it sells, you are done.  The money gets credited to your account.  At some point (after the price falls) you should repurchase it so you don't have a negative position any more, but your brokerage isn't going to hassle you for this unless you bought a lot and the stock price starts rising.  There will be limits on how much you can short, depending on how much money is in your account.  Some stocks (distressed and small stocks) may sometimes be hard to short, meaning your broker will charge you a kind of interest and/or may not be able to complete your transaction. You will need a margin account (a type of brokerage account) to either use options or short sell.  They are easy to come by, though. Note that for a given amount of starting money in your account, puts can give you a much more dramatic gain if the stock price falls.  But they can (and often do) expire worthless, causing you to lose all money you have spent on them.  If you want to maximize how much you make, use puts.  Otherwise I'd short sell. About IPOs, it depends on what you mean.  If the IPO has just completed and you want to bet that the share price will fall, either puts or short selling will work.  Before an IPO you can't short sell and I doubt you would be able to buy an option either. Foreign stocks?  Depends on whether there is an ADR for them that trades on the domestic market and on the details of your brokerage account.  Let me put it this way, if you can buy it, you can short sell it.