Spokeswoman Patricia Trott says a third party gained access last week to the email address of a Rogers employee who managed a "small number" of medium-sized business accounts.
The hacker was able to get access to business agreements containing the names, addresses and phone numbers of a number of business clients, as well as pricing details.
No personal or financial information was contained in the agreements and no consumer accounts were affected.
Trott says as soon as the company became aware of the breach, it took all of the necessary steps to secure its systems.
Trott says "human error" was responsible for the breach.
"We are working with the police and we have been contacting affected business customers," Trott said in an email.
"As a precaution, we've put additional security procedures in place for our business customers. We take the privacy and security of our customers' information very seriously and we will continue to review our policies and procedures."
ALSO ON HUFFPOST: