An interesting and related situation is when large blockholders in corporations simultaneously hold significant short interests in derivatives of their company

An interesting and related situation is when large blockholders in corporations simultaneously hold significant short interests in derivatives of their company shares. This is espescially useful when a value destroying acquisition is on the table. If the blockholder also owns a significant portion of the target, they can use their block to force the acquistion, profiting from the gain in the target and the loss for the acquirer.