DES MOINES, Iowa--(BUSINESS WIRE)--Working Mother magazine today named the Principal Financial Group as one of the 2015 Working Mother 100 Best Companies for its commitment to progressive workplace programs, including advancement of women, flexibility, child care and paid parental leave. The 100 Best Companies are featured in the October/November issue of Working Mother and on workingmother.com. “We are honored to be named to the Working Mother 100 Best Companies for the 13th time,” said Beth R