Who is the largest shareholder of CRISPR?

Can you please clarify who holds the largest share of ownership in CRISPR Therapeutics, the pioneering gene-editing company? Are we referring to an individual investor, a venture capital firm, or perhaps a pharmaceutical giant that has taken a significant stake in the company? Additionally, is there any recent news or developments that have led to changes in the company's shareholder composition, and how might these changes impact the company's overall strategy and performance?