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Is my employee stock purchase plan a risk free investment?
Your maximum risk is 100%. If you buy the stock 15% off and your company goes bankrupt tomorrow, you've lost everything. It also sounds like you have foreign exchange risk. One can debate how much risk this is in terms of expected outcomes, but that was not your question. However, if you purchase the company stock and buy put options at the same time, you can lock in a sale price ahead of time and absolutely limit your risk. Depending on the amount of stock we're talking about, you can buy currency futures as well to hedge the exchange risk. You don't necessarily have to buy the break-even strikes, you can buy the ones that guarantee a positive return. These are probably fairly cheap.  Note that a lot of companies have policies that prohibit beneficiaries from shorting the company stocks, in which case you might not be able to hedge yourself with put options.