You mean "collective" activity, not "collectivist." Doesn't it disturb you in the slightest that you are unaware of the difference?
Nope. I believe you're still confusing collectivism with with other terms.
By purchasing a share in a corporation, one becomes part-owner in a collective enterprise which then assumes greater importance and power than any of its' sum parts.
Collectivism is the antithesis of individualism.