The bank, citing customer privacy concerns, declined to comment.
"Protecting customer privacy is critical to us," the company said.
Companies must take particular care in screening employees and training them to safeguard customer privacy.
Records were aggregated to the census tract level to protect customer privacy.
Eddy Cue, Apple's head of services, emphasised that customer privacy was key.
AT&T has a long history of vigorously protecting customer privacy.
Asked about Ms. Calderone's complaint, a spokeswoman for the PulteGroup declined to comment, citing concerns over customer privacy.
Most users of the data, Sam's Club included, insist they have rigorous protocols to protect customer privacy.
"AT&T has a long history of vigorously protecting customer privacy," said a spokesman, Selim Bingol.
And protecting customer privacy has come to be seen as a competitive necessity.
Three claims it is aiming to improve customer privacy and provide a better experience for its users.
