Investment firm Mitsui & Co. Ltd. acquired The Delta Companies, one of the largest providers of locum tenens in the U.S.

“TDC was chosen to become the foundation of our global healthcare staffing initiative because of their people, culture, performance and history of giving back to the community,” said Seiki Hirota, vice president of Mitsui’s consumer service business division.

Delta is based in Dallas, and was established in 1997. It has revenue of approximately $78 million, according to Mitsui. Delta has appeared on the past lists of fastest-growing staffing firms, and most recently CEO Jeff Bowling was included on the Staffing 100 list of most influential people in the staffing industry.

Delta ranks as the seventh-largest U.S. provider of locum tenens and the 21st-largest healthcare staffing provider in the U.S.

Mitsui is becoming a 100 percent owner of Delta in the deal. The investment firm said aging populations in developed countries, economic growth of the middle class and breakthroughs in medical technology increased demand for healthcare providers. Mitsui is based in Tokyo.