You can accomplish what you want in a shareholders agreement where all the shareholders agree to this writing. A change in the by-laws is unncessary.Have an attorney draft the agreement.
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As noted correctly by my colleague, you can provide for voting rights in a shareholder agreement. You can also use a voting trust and other mechanisms.
If all the shareholders are active in the business, there should be fairly limited securities offering issues. If, however, any of the shareholders are merely passive investors then there are securities issues that must be considered and addressed or this may be a violation of state and federal law.
Contact a local business attorney.
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You may be able to accomplish this through agreement, but I would be inclined to issue different classes of stock. You cannot do that as an S corporation, though. I would prefer that your voting power once established not be subject to continued approval of your fellow shareholders. However, if you cannot issue different classes, a shareholders agreement may work. You might also use a voting trust or similar agreement which guarantees you 50% of the votes.