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Can a shareholder be liable in case of bankruptcy of one of the companies he invested in?
No. One of the key ideas behind a corporation is that an investor's liability is limited to the amount he invests, i.e. the amount of stock he buys. This is the primary reason why small businesses become corporations, even though one person owns 100% of the stock. Then if the business goes broke, he won't lose his house, retiretment fund, etc. He'll lose everything he had in the business, but at least there's a limit to it. (In some countries there are other ways to achieve the same results, like creating a "limited liabililty company", but that's another story.)