1. The lead supervisory authority shall regularly update the other supervisory authorities concerned about the investigation and provide the other supervisory authorities concerned, at the earliest convenience, with all relevant information once available.

2. Relevant information within the meaning of Article 60(1) and (3) of Regulation (EU) 2016/679 shall include, where applicable:

(a) information on the opening of an investigation of an alleged infringement of Regulation (EU) 2016/679;

(b) requests for information pursuant to Article 58(1) , point (e) of Regulation (EU) 2016/679;

(c) information of the use of other investigative powers referred to in Article 58(1) of Regulation (EU) 2016/679;

(d) in the case of envisaged rejection of complaint, the lead supervisory authority’s reasons for rejection of the complaint;

(e) summary of key issues in an investigation in accordance with Article 9;

(f) information concerning steps aiming to establish an infringement of Regulation (EU) 2016/679 prior to the preparation of preliminary findings;

(g) preliminary findings;

(h) the response of the parties under investigation to the preliminary findings;

(i) the views of the complainant on the preliminary findings;