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How do dividends of the underlying security in a security futures contract affect the security futures price?
The owner of a long futures contract does not receive dividends, hence this is a disadvantage compared to owning the underlying stock. If the dividend is increased, and the future price would not change, there is an arbitrage possibility. For the sake of simplicity, assume that the stock suddenly starts paying a dividend, and that the risk free rate is zero (so interest does not play a role). One can expect that the future price is (rougly) equal to the stock price before the dividend announcment. If the future price would not change, an investor could buy the stock, and short a futures contract on the stock. At expiration he has to deliver the stock for the price set in the contract, which is under the assumptions here equal to the price he bought the stock for. But because he owned the stock, he receives the announced dividend. Hence he can make a risk-free profit consisting of the divivends. If interest do play a role, the argument is similar.