Randstad Holding NV's acquisition of Vedior NV will become effective July 1, the companies reported today. Shares in Vedior will cease trading on June 25, the same day the merger will come before Vedior shareholders for approval. Randstad shareholders will meet June 26.

Randstad ranks as the world's third-largest staffing company, while Vedior ranks as fourth largest. The combined companies would rank as the second-largest staffing firm.

Vedior shareholders will receive 0.67258 Randstad shares for each Vedior share.