Cineworld, based in the United Kingdom, is paying $23 cash per Regal share, marking an 11 percent premium over its closing price on Monday. The deal is valued at $5.9 billion including debt.
Regal, based in Knoxville, Tennessee, operates 7,315 screens in 561 theaters in the U.S. under brands including Regal Cinemas and United Artists.
Regal Entertainment Group purchased the Warren Theatres in Wichita back in May.
Cineworld operates 2,227 screens in nations including the U.K., Ireland, Poland, and Slovakia.
The deal is expected to close during the first quarter of 2018.
In morning trading, Regal shares rose 9.4 percent to $22.67. The stock is up 10 percent in the year to date.