Hacktivism is defined as an action in which a computer or a network is targeted so that it could be misused in order to achieve a goal against any social or political action.
Hacktivists are the persons who perform hacktivism in order to seek attention on a specific thing or issue they want, from all the people.
In the given scenario, the hacking attack is hactivism as it is done to pull the company down.
Hacktivist can be a single person as well as a group of people working together. However they try to work anonymously so that they could not be traced.