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No, not really. That he owns shares is enough that he can force you to purchase them or refuse to sell the shares.
What you can do is - just not pay dividends on the shares - but only pay for work performed instead. If he doesn't get any income - then he might be more inclined on selling you the shares of stock.
Since there is 75% between you and the other owners - just agree between you that your not going to be paying any dividends. Eventually he'll start thinking about selling out to you three.
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