A shopper is seen in a Target store in the Brooklyn borough of New York.

Target said Monday it will be taking its recently revamped loyalty program, Target Circle, nationwide beginning Oct. 6.

CNBC had reported in February that Target was testing the program, which includes new perks like a birthday reward, in five markets – including in Charlotte, North Carolina, and in Phoenix. Prior to that, Target Circle was being tested more stealthily in Dallas.

Target said that over 18 months, more than 2 million people have already enrolled in Target Circle, which doesn't require the person to pay a membership fee or have a Target credit card. It said those people have completed more than 14 million transactions and that people using Target Circle are spending more in stores and online than those not enrolled in the program.

"We are seeing a benefit in building our guest base," Rick Gomez, Target's chief marketing and digital officer, said on a call with media. During the pilot phase, "engagement [has] exceeded our expectations," he said.