Regulation (EU) 2004/139 — EC Merger Regulation

Does our planned acquisition trigger an EU merger filing — and what happens if we close before clearance?

If the merging parties exceed EUR 5 billion combined worldwide turnover and EUR 250 million each in the EU, they must notify the European Commission before closing — gun-jumping fines reach 10 % of group turnover [Art. 14(2)].

Short Answer

The EC Merger Regulation establishes a mandatory, suspensory pre-merger control system for concentrations with a 'Community dimension' [Art. 1]. The Commission must be notified before implementation [Art. 4(1)], and the transaction may not close until cleared [Art. 7(1)]. A concentration that would significantly impede effective competition, in particular by creating or strengthening a dominant position, is declared incompatible and may be unwound [Art. 2(3), Art. 8(4)]. The Commission may accept remedies — divestitures, behavioural commitments — to clear a problematic deal [Art. 8(2)].

Who is affected

Any undertaking involved in a merger, acquisition of control, or full-function joint venture where either (a) combined worldwide turnover exceeds EUR 5 billion and at least two parties each have EU-wide turnover above EUR 250 million [Art. 1(2)], or (b) the alternative three-Member-State thresholds in Art. 1(3) are met. The two-thirds domestic-turnover exception removes the filing obligation only if each party generates more than two-thirds of its EU turnover in a single Member State.

Deadline

Permanent obligation: notification must be filed prior to implementation, following conclusion of the agreement, announcement of the public bid, or acquisition of a controlling interest [Art. 4(1)]. Phase I review takes up to 25 working days [Art. 10(1)]; Phase II, if opened, up to 90 working days [Art. 10(3)], extendable to 105 working days if commitments are offered.

Risk

Fines for gun-jumping (implementing without notification or before clearance) reach up to 10 % of aggregate group turnover [Art. 14(2)]. Procedural fines for supplying incorrect or misleading information can reach 1 % of turnover [Art. 14(1)]. The Commission may also impose periodic penalty payments of up to 5 % of average daily turnover per working day of delay [Art. 15(1)]. Concentrations declared incompatible may be ordered dissolved [Art. 8(4)].

Proof

Legal status

• In force
• as of 2026-05-10
• Original version (OJ L 24, 29.01.2004, p. 1-22)

Primary sources

• EUR-Lex — Full text
• European Commission — Mergers — DG COMP Mergers

What to do now

Legal / DPO

•Determine whether the transaction meets the turnover thresholds in Art. 1(2) or the alternative thresholds in Art. 1(3), and assess the two-thirds domestic-turnover exception — an incorrect assessment can lead to gun-jumping liability [Art. 14(2)].
•Prepare and file a complete Form CO notification prior to closing, including all information required under Art. 4(1)-(3); incomplete submissions restart the review clock and may trigger fines up to 1 % of turnover [Art. 14(1)(a)].
•Structure any pre-notification referral request under Art. 4(4) or Art. 4(5) if the transaction predominantly affects a distinct national market or falls below EU thresholds but is reviewable in three or more Member States — the 15-working-day response window is strict.

Compliance

•Implement a standstill protocol ensuring no closing steps occur before clearance [Art. 7(1)] — even partial implementation, including exercising voting rights, constitutes gun-jumping [Art. 7(2)].
•Establish an internal information-barrier framework during the review period to prevent premature coordination between merging parties, which the Commission may treat as early implementation under Art. 7.
•Track all review deadlines: 25 working days for Phase I [Art. 10(1)], 35 working days if commitments are offered or a Member State referral request is made, and 90-105 working days for Phase II [Art. 10(3)] — missed deadlines by the Commission result in deemed clearance [Art. 10(6)].

IT / Security

•Segregate IT systems and data access between the merging parties during the review period to support the compliance team's information-barrier obligations under the standstill requirement [Art. 7(1)].
•Prepare data-room infrastructure and document-management systems for the Commission's investigative requests under Art. 11 and dawn-raid inspections under Art. 13 — officials may examine any business records irrespective of storage medium [Art. 13(2)(b)].
•Ensure audit trails for all digital communications and document access during the review, as the Commission may seal business premises, books, and records during inspections [Art. 13(2)(d)] and impose fines for broken seals [Art. 14(1)(f)].

Product / Engineering

•Identify overlapping product and geographic markets early, as the Commission's competitive assessment under Art. 2(1) considers market position, barriers to entry, supply-demand trends, and consumer interests — product teams hold the market knowledge needed for the Form CO.
•Prepare efficiency arguments showing consumer benefit, as Art. 2(1)(b) explicitly weighs technical and economic progress that benefits consumers; quantified synergies can shift the substantive assessment.
•Design remedy-ready divestiture packages for overlapping product lines in case the Commission requires commitments under Art. 8(2) — early preparation of carve-out plans shortens the Phase II timeline.

Key Terms

Concentration: A lasting change of control resulting from a merger of previously independent undertakings, an acquisition of sole or joint control, or the creation of a full-function joint venture [Art. 3].
Community dimension: A concentration meets the turnover thresholds in Art. 1(2) or Art. 1(3), giving the European Commission exclusive jurisdiction to review it under the one-stop-shop principle.
SIEC test (Significant Impediment to Effective Competition): The substantive standard under Art. 2(2)-(3): a concentration is incompatible with the common market if it would significantly impede effective competition, in particular by creating or strengthening a dominant position.
Gun-jumping: Implementing a concentration before notification or before receiving clearance, in breach of the standstill obligation under Art. 7(1). Sanctioned with fines up to 10 % of aggregate turnover [Art. 14(2)].
Standstill obligation: The requirement under Art. 7(1) that a concentration with Community dimension may not be implemented until cleared by the Commission or deemed cleared under Art. 10(6).
Phase I / Phase II: Phase I is the initial 25-working-day review under Art. 6; Phase II is the in-depth investigation of up to 90-105 working days under Art. 8, initiated when the Commission finds serious doubts about compatibility.
Commitments (remedies): Structural or behavioural modifications offered by the notifying parties to eliminate competition concerns, allowing the Commission to declare the concentration compatible under Art. 6(2) or Art. 8(2).
Referral: The mechanism under Art. 4(4)-(5), Art. 9, and Art. 22 by which jurisdiction over a concentration is transferred between the Commission and Member State competition authorities.

Frequently Asked Questions

What qualifies as a 'concentration' under the Merger Regulation?

A concentration arises from any lasting change of control: a full merger, an acquisition of sole or joint control (by purchase of securities, assets, or contract), or the creation of a full-function joint venture [Art. 3(1), Art. 3(4)]. Temporary holdings by financial institutions are excluded if voting rights are not exercised and the securities are resold within one year [Art. 3(5)(a)].

When can a Member State review a deal that has EU dimension?

A Member State may request referral within 15 working days of receiving the notification if the concentration threatens to significantly affect competition in a distinct national market [Art. 9(2)]. The Commission must decide whether to refer within the Phase I period or within 65 working days after initiating Phase II proceedings [Art. 9(4)].

What is the 'SIEC' test?

The Significant Impediment to Effective Competition test replaced the older 'dominance' test. Under Art. 2(3), the Commission blocks any concentration that would significantly impede effective competition in the common market or a substantial part of it, in particular but not only through the creation or strengthening of a dominant position. This covers non-coordinated (unilateral) effects in oligopolistic markets [Recital 25].

Can parties close before receiving formal clearance?

No. Art. 7(1) imposes a standstill obligation: a notified concentration may not be implemented before clearance under Art. 6(1)(b) or Art. 8(1)/(2). A narrow exception exists for public bids and sequential share purchases, provided the acquirer does not exercise voting rights [Art. 7(2)]. The Commission may grant a derogation on request [Art. 7(3)].

What happens if the Commission misses its review deadlines?

If the Commission fails to take a Phase I decision within 25 working days (or 35, if extended) or a Phase II decision within 90-105 working days, the concentration is deemed cleared by operation of law [Art. 10(6)].

How are turnover thresholds calculated for financial institutions?

For credit and financial institutions, Art. 5(3)(a) replaces turnover with the sum of specified income items — interest income, securities income, commissions, net profit on financial operations, and other operating income — as defined in Directive 86/635/EEC, after deducting VAT and related taxes.

Can the Commission unwind a completed merger?

Yes. If a concentration is declared incompatible after implementation, or if a condition attached to a clearance decision is breached, the Commission may order dissolution — including divestiture of all acquired shares or assets — to restore the pre-merger situation [Art. 8(4)]. It may also take interim measures to maintain effective competition [Art. 8(5)].

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Sources

[1]32004R0139Regulation (EU) 2004/139 — EC Merger Regulation — Control of Concentrations Between Undertakings