Alphabet's (GOOGL - Get Report) Google is the subject of another European Union investigation after Ireland's Data Protection Commission announced that it is launching an inquiry into the tech giant's handling of personal data related to online advertising. 

The Data Protection Commission acts as the lead supervisory authority for Google in the EU. The Commission said that its probe would examine whether Google's business violates EU privacy rules. 

"A statutory inquiry pursuant to section 110 of the Data Protection Act 2018 has been commenced in respect of Google Ireland Limited's processing of personal data in the context of its online Ad Exchange," the Commission said in a statement Wednesday. 

Google was fined 50 million euros ($55.8 million) earlier this year by France's privacy regulatory in the first enforcement of the EU's GDPR law after it was introduced last year. 

"The purpose of the inquiry is to establish whether processing of personal data carried out at each stage of an advertising transaction is in compliance with the relevant provisions of the General Data Protection Regulation (GDPR). The GDPR principles of transparency and data minimization, as well as Google's retention practices, will also be examined," the Commission said.

Alphabet shares were up 0.1% to $1,156.06 on Wednesday afternoon.

Alphabet is a key holding in Jim Cramer's Action Alerts PLUS charitable trust