(a) the making or execution of any term contract or arrangement for stevedoring services with a carrier of freight by water and of the termination or cancellation of such contract, but such notification shall not be required with respect to oral or written “spot” contracts or arrangements entered into with a carrier of freight by water or its agent for a single vessel operation; and

(b) any change in the officers, directors, and/or stockholders owning five percent or more of the capital stock of any class or any change in the capitalization of the corporation.