osallistuvansa
Osallistuvansa is a Finnish non-finite verb form that functions as a present active participle of the verb osallistua (to participate) with a third-person possessive suffix. The base participle stem is osallistuva meaning "participating," and the suffix -nsa (or -nsä, depending on vowel harmony) marks that the subject of the participle belongs to the subject of the main clause. The result, osallistuvansa, expresses that the subject herself or himself participates or is participating in the action described.
As a participial form, osallistuvansa is used to form participial clauses that condense information and avoid
Osallistuvansa is built from osallistua + present active participle ending -va/-vä, with the addition of the possessive