How to measure employee ownership, team spirit, and collaborative nature?
It sounds like you are talking about a range of concepts.
You could look into measures related to:


Organisational citizenship behaviour: This tends to look at good discretionary behaviors such as collaboration, helping out colleagues, and so on.
Engagement and affective commitment: Both these constructs are closely related to motivation and alignment with the organisation (e.g., ownership).


Just do a search on google scholar for articles on these topics and look at the methods sections.

There are a range of popular measures that could readily be applied as self-report instruments. Alternatively, you could get peers or supervisors to rate employees.

A few suggestions:


Lee and Allen's (2002) Organizational Citizenship Behavior Scale. 
Utrecht engagement scale