Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

How much percent of my salary should I use to invest in company stock?
I agree with the other comments that you should not buy/hold your company stock even if given at a discount. If equity is provided as part of the compensation package (Options/Restrictive Stock Units RSU)then this rule does not apply. As a matter of diversification, you should not have majority equity stake of other companies in the same sector (e.g. technology) as your employer. Asset allocation and diversification if done in the right way, takes care of the returns. Buying and selling on the same day is generally not allowed for ESPP. Taxation headaches. This is from personal experience (Cisco Systems). I had options issued in Sept 2008 at 18$ which vested regularly. I exited at various points - 19$,20$,21$,23$ My friend held on to all of it hoping for 30$ is stuck. Options expire if you leave your employment. ESPP shares though remain.