Who owns strategy in the organization?

It is the job of CEO to have a vision, to set a direction. In that sense, the CEO owns the strategy (on behalf of the Board of Directors, the ultimate owners). But the buck stops at the CEO anyways. The CEO owns everything and yet can never own anything completely. He is accountable for everything and yet cannot be completely responsible for it.
 
So an appropriate question to ask is perhaps who is responsible for strategy amongst the executive team? In a...