1. When the Commission intends to carry out a market investigation with a view to the possible adoption of decisions pursuant to Articles 17, 18 and 19 it shall adopt a decision opening a market investigation.

2. Notwithstanding paragraph 1, the Commission may exercise its investigative powers under this Regulation before opening a market investigation pursuant to that paragraph.

3. The decision referred to in paragraph 1 shall specify:

(a) the date of opening of the market investigation;

(b) the description of the issue to which the market investigation relates to;

(c) the purpose of the market investigation.

4. The Commission may reopen a market investigation that it has closed where:

(a) there has been a material change in any of the facts on which a decision adopted pursuant to Article 17, 18 or 19 was based; or

(b) the decision adopted pursuant to Article 17, 18 or 19 was based on incomplete, incorrect or misleading information.

5. The Commission may ask one or more competent national authorities to assist it in its market investigation.

1. The Commission may conduct a market investigation for the purpose of examining whether an undertaking providing core platform services should be designated as a gatekeeper pursuant to Article 3(8), or in order to identify the core platform services to be listed in the designation decision pursuant to Article 3(9). The Commission shall endeavour to conclude its market investigation within 12 months from the date referred to in Article 16(3), point (a), In order to conclude its market investigation, the Commission shall adopt an implementing act setting out its decision. That implementing act shall be adopted in accordance with the advisory procedure referred to in Article 50(2).

2. In the course of a market investigation pursuant to paragraph 1 of this Article, the Commission shall endeavour to communicate its preliminary findings to the undertaking providing core platform services concerned within 6 months from the date referred to in Article 16(3), point (a). In the preliminary findings, the Commission shall explain whether it considers, on a provisional basis, that it is appropriate for that undertaking to be designated as a gatekeeper pursuant to Article 3(8), and for the relevant core platform services to be listed pursuant to Article 3(9).

3. Where the undertaking providing core platform services satisfies the thresholds set out in Article 3(2), but has presented sufficiently substantiated arguments in accordance with Article 3(5) that have manifestly called into question the presumption in Article 3(2), the Commission shall endeavour to conclude the market investigation within 5 months from the date referred to in Article 16(3), point (a).

In such a case, the Commission shall endeavour to communicate its preliminary findings pursuant to paragraph 2 of this Article to the undertaking concerned within 3 months from the date referred to in Article 16(3), point (a).

4. When the Commission, pursuant to Article 3(8), designates as a gatekeeper an undertaking providing core platform services that does not yet enjoy an entrenched and durable position in its operations, but which will foreseeably enjoy such a position in the near future, it may declare applicable to that gatekeeper only one or more of the obligations laid down in Article 5, points (b) (c), (ca) and (d) and Article 6(1), points (e), (f), (h), (i) and (ka), as specified in the designation decision. The Commission shall only declare applicable those obligations that are appropriate and necessary to prevent the gatekeeper concerned from achieving, by unfair means, an entrenched and durable position in its operations. The Commission shall review such a designation in accordance with the procedure laid down in Article 4.

1. The Commission may conduct a market investigation for the purpose of examining whether a gatekeeper has engaged in systematic non-compliance. The Commission shall conclude that market investigation within 12 months from the date referred to in Article 16(3), point (a). The Commission shall adopt an implementing act setting out its decision to conclude its market investigation. Where the market investigation shows that a gatekeeper has systematically infringed one or more of the obligations laid down in Articles 5, 6 or 7 and has maintained, strengthened or extended its gatekeeper position in relation to the requirements set out in Article 3(1), those implementing acts may impose on such gatekeeper any behavioural or structural remedies which are proportionate and necessary to ensure effective compliance with this Regulation. Those implementing acts shall be adopted in accordance with the advisory procedure referred to in Article 50(2).

2. The remedy imposed in accordance with paragraph 1 may include, to the extent that such remedy is proportionate and necessary in order to maintain or restore fairness and contestability as affected by the systematic non-compliance, the prohibition, during a limited period, for the gatekeeper to enter into a concentration within the meaning of Article 3 of Regulation (EC) No 139/2004 regarding the core platform services or the other services provided in the digital sector or enabling the collection of data that are affected by the systematic non-compliance.

3. A gatekeeper shall be deemed to have engaged in systematic non-compliance with the obligations laid down in Articles 5, 6 and 7, where the Commission has issued at least three non-compliance decisions pursuant to Article 29 against a gatekeeper in relation to any of its core platform services within a period of 8 years prior to the adoption of the decision opening a market investigation in view of the possible adoption of a decision pursuant to this Article.

4. The Commission shall communicate its preliminary findings to the gatekeeper concerned within 6 months from the date referred to in Article 16(3), point (a). In its preliminary findings, the Commission shall explain whether it preliminarily considers that the conditions of paragraph 1 are met and which remedy or remedies it preliminarily considers necessary and proportionate.

5. In order to enable interested third parties to effectively provide comments, the Commission shall, at the same time as communicating its preliminary findings to the gatekeeper pursuant to paragraph 4 or as soon as possible thereafter, publish a non-confidential summary of the case and the remedies that it is considering imposing. The Commission shall specify a reasonable timeframe within which such comments are to be provided.

6. Where the Commission intends to adopt a decision pursuant to paragraph 1 of this Article by making commitments offered by the gatekeeper pursuant to Article 25 binding, it shall publish a non-confidential summary of the case and the main content of the commitments. Interested third parties may submit their comments within a reasonable timeframe which shall be set by the Commission.

7. In the course of the market investigation, the Commission may extend its duration where such extension is justified on objective grounds and proportionate. The extension may apply to the deadline by which the Commission has to issue its preliminary findings, or to the deadline for adoption of the final decision. The total duration of any extension or extensions pursuant to this paragraph shall not exceed 6 months.

8. In order to ensure effective compliance by the gatekeeper with its obligations laid down in Articles 5, 6, and 7, the Commission shall regularly review the remedies that it imposes in accordance with paragraphs 1 and 2 of this Article. The Commission shall be entitled to modify those remedies if, following a new market investigation, it finds that they are not effective.

1. The Commission may conduct a market investigation for the purpose of examining whether one or more services within the digital sector should be added to the list of core platform services laid down in Article 2, point (2) or for the purpose of detecting practices that limit the contestability of core platform services or that are unfair and which are not effectively addressed by this Regulation. In its assessment, the Commission shall take into account any relevant findings of proceedings under Articles 101 and 102 TFEU concerning digital markets as well as any other relevant developments.

2. The Commission may, when conducting a market investigation pursuant to paragraph 1, consult third parties, including business users and end users of services within the digital sector that are being investigated and business users and end users who are subject to practices under investigation.

3. The Commission shall publish its findings in a report within 18 months from the date referred to in Article 16(3), point (a).

Where appropriate, that report shall be submitted to the European Parliament and to the Council and be accompanied by:

(a) a legislative proposal to amend this Regulation in order to include additional services within the digital sector in the list of core platform services laid down in Article 2, point (2), or to include new obligations in Chapter III; or

(b) a draft delegated act supplementing this Regulation with regard to the obligations laid down in Articles 5 and 6, or a draft delegated act amending or supplementing this Regulation with regard to the obligations laid down in Article 7, as provided for in Article 12.

Where appropriate, the legislative proposal to amend this Regulation under point (a) of this paragraph may also propose to remove existing services from the list of core platform services laid down in Article 2, point (2), or to remove existing obligations from Article 5, 6 or 7.