Horizontal Merger vs Vertical Merger Review Under China’s AML: Which Competition Law Approach?
Introduction
The distinction between horizontal and vertical mergers is one of the most fundamental concepts in merger control analysis under China’s Anti-Monopoly Law (AML). Horizontal mergers involve the combination of firms that operate at the same level of the supply chain and are actual or potential competitors in the same relevant market. Vertical mergers involve the combination of firms that operate at different levels of the supply chain, where one party is a supplier to or customer of the other. The competitive analysis of these two types of mergers differs significantly because the potential competitive harms and benefits associated with each type are fundamentally different.
For foreign businesses planning acquisitions in China, understanding how the State Administration for Market Regulation (SAMR) evaluates horizontal versus vertical mergers is essential for predicting regulatory outcomes, designing appropriate remedy proposals, and structuring transactions to minimize antitrust risk. This comparison provides a comprehensive analysis of SAMR’s approach to horizontal and vertical merger review, examining the legal framework, analytical methodologies, enforcement patterns, and practical implications for merging parties.
Legal framework and definitions
China’s AML does not explicitly define horizontal or vertical mergers but addresses all “concentrations of undertakings” under a single framework. However, SAMR’s substantive analysis differentiates between horizontal and vertical relationships based on the competitive relationship between the parties. The AML’s implementing regulations, including the Guiding Opinions on the Definition of Relevant Markets and the Interim Provisions on the Review of Concentrations of Undertakings, provide the analytical framework for assessing both horizontal and vertical effects.
A horizontal merger is defined by the competitive relationship between the parties: they are actual or potential competitors in the same relevant product and geographic market. A vertical merger is defined by the supply chain relationship: one party is an actual or potential supplier to, customer of, or distributor of the other party’s products. SAMR also recognizes a third category, conglomerate mergers, which involve parties that are neither competitors nor vertically related but may have portfolio effects or other competitive implications.
The analytical approach to horizontal and vertical mergers reflects the different competitive theories of harm associated with each type. Horizontal mergers raise concerns about unilateral effects (the merged entity’s ability to raise prices or reduce output independently) and coordinated effects (the increased likelihood of tacit or explicit coordination among remaining market participants). Vertical mergers raise concerns about input foreclosure (the merged entity refusing to supply inputs to downstream competitors), customer foreclosure (the merged entity refusing to purchase from upstream competitors), and the exchange of competitively sensitive information between the merged entity’s upstream and downstream operations.
Competitive analysis of horizontal mergers
SAMR’s analysis of horizontal mergers follows a structured framework that examines the likely competitive effects of the transaction in the relevant market. The key analytical steps include:
Market definition and concentration
The first step in horizontal merger analysis is the definition of the relevant product and geographic markets. SAMR applies a standard market definition methodology based on demand-side substitution, considering product characteristics, intended use, price levels, and switching costs. For horizontal mergers, market definition is particularly important because it determines the market shares of the parties and the market concentration metrics that form the initial screen for competitive concerns. SAMR examines both the Herfindahl-Hirschman Index (HHI) and the market shares of the parties, although it does not apply rigid HHI thresholds comparable to the US Merger Guidelines.
Unilateral effects analysis
SAMR analyzes whether the merged entity would have the ability and incentive to unilaterally raise prices, reduce output, or diminish quality after the merger. Factors considered include: the combined market share of the parties, the closeness of competition between the parties’ products, the degree of product differentiation, the presence of capacity constraints, and the ability of competitors to expand output or reposition their products to respond to a price increase. SAMR places significant weight on evidence of head-to-head competition between the parties prior to the merger, including bid data, customer switching patterns, and internal business documents that identify each other as primary competitors.
Coordinated effects analysis
SAMR also considers whether the merger increases the likelihood of coordinated conduct among remaining market participants. Factors relevant to this analysis include market concentration, product homogeneity, transparency of pricing and output decisions, symmetry of market shares and cost structures, the presence of maverick firms, and the effectiveness of entry barriers in deterring new competition that would destabilize coordinated conduct. SAMR has blocked or imposed conditions on several horizontal mergers on coordinated effects grounds, particularly in oligopolistic markets where the merger reduces the number of significant competitors from four to three or from three to two.
Entry and expansion analysis
A critical element of the competitive analysis is whether entry or expansion by existing competitors would be timely, likely, and sufficient to counteract any anti-competitive effects of the merger. SAMR examines barriers to entry including regulatory requirements, capital requirements, intellectual property rights, access to essential inputs or distribution channels, and the time required to achieve minimum efficient scale. Where entry barriers are high, SAMR is more likely to find that the merger raises competition concerns.
Efficiencies assessment
Under the 2022 AML amendments, the consideration of efficiencies in merger review has been placed on a more formal footing. Parties may argue that the merger generates efficiencies that offset any potential competitive harms, including cost savings, technological improvements, and enhanced innovation. However, SAMR’s practice suggests that efficiency arguments rarely outweigh strong competitive concerns in horizontal mergers, and the evidentiary burden on the parties to demonstrate merger-specific, verifiable, and pro-competitive efficiencies is high.
| Analytical Factor | Horizontal Mergers | Vertical Mergers |
|---|---|---|
| Primary Theory of Harm | Unilateral effects, coordinated effects | Input foreclosure, customer foreclosure, information exchange |
| Market Definition Focus | Same relevant market | Upstream and downstream markets |
| Key Metrics | Market shares, HHI, closeness of competition | Market power in upstream/downstream market, foreclosure share |
| Efficiency Defense | Rarely accepted for strong horizontal concerns | More commonly accepted (elimination of double marginalization) |
| Remedy Type | Structural (divestiture) strongly preferred | Behavioural (firewalls, non-discrimination, access) commonly accepted |
| Review Intensity | High; most conditional decisions involve horizontal overlaps | Moderate to low; many vertical mergers cleared unconditionally |
Competitive analysis of vertical mergers
SAMR’s analysis of vertical mergers has become increasingly sophisticated as the regulator has gained experience with complex vertical integration transactions. The analytical framework focuses on the competitive effects of the vertical relationship between the merged entity’s operations at different levels of the supply chain.
Input foreclosure analysis
SAMR examines whether the merged entity would have the ability and incentive to restrict access to upstream inputs that it supplies to downstream competitors. The analysis requires a determination that: (1) the merged entity has market power in the upstream input market; (2) downstream competitors are dependent on the input supplied by the merged entity and cannot practically substitute it; (3) the merged entity would have the incentive to foreclose downstream competitors to increase its own downstream market share; and (4) the foreclosure would have an adverse effect on competition in the downstream market. SAMR examines the share of the upstream input that competitors would be foreclosed from accessing, the availability of alternative input suppliers, and the likely impact on downstream prices and output.
Customer foreclosure analysis
Similarly, SAMR analyzes whether the merged entity would have the ability and incentive to restrict its downstream purchases from upstream competitors. Customer foreclosure occurs when the merged entity uses its downstream market power to channel purchases away from upstream competitors, thereby raising their costs or reducing their revenues and ultimately weakening their ability to compete. This theory of harm is particularly relevant in markets where distribution channels are concentrated and upstream competitors depend on access to the merged entity’s downstream operations.
Information exchange and coordination concerns
Vertical mergers can facilitate the exchange of competitively sensitive information between the merged entity’s upstream and downstream operations. SAMR examines whether the merger would create opportunities for the merged entity to obtain information about downstream competitors’ pricing strategies, output levels, or customer relationships through its upstream supply operations, and whether such information could be used to coordinate conduct or engage in anti-competitive practices. Firewall commitments requiring the separation of the merged entity’s upstream and downstream information systems are a common remedy for these concerns.
Elimination of double marginalization
An important pro-competitive effect that SAMR considers in vertical mergers is the elimination of double marginalization (EDM). When a downstream firm purchases an input from an independent upstream supplier that charges a markup over marginal cost, the downstream firm adds its own markup, resulting in two markups on the final product. After a vertical merger, the merged entity can internalize this pricing distortion and charge lower downstream prices, benefiting consumers. SAMR recognizes EDM as a legitimate efficiency benefit of vertical mergers and typically weighs it against the potential foreclosure concerns in its overall competitive assessment.
Enforcement patterns and case examples
SAMR’s enforcement record reveals distinct patterns in its treatment of horizontal versus vertical mergers. Horizontal mergers account for the majority of conditional clearance decisions (transactions cleared with remedies) and the small number of prohibition decisions issued by SAMR. This reflects the generally higher level of competitive concern associated with horizontal mergers, particularly in concentrated markets.
Notable horizontal merger decisions include:
- Bayer/Monsanto (2018): SAMR imposed extensive global divestiture requirements, including Bayer’s vegetable seeds, cotton seeds, and digital agriculture businesses, representing one of the largest remedy packages ever required by a Chinese competition authority.
- Marubeni/Gavilon (2013): SAMR required Marubeni to divest its grain trading business in China to address horizontal overlap concerns in the grain procurement and trading market.
- NXP/Freescale (2015): SAMR imposed conditions requiring the merged entity to maintain open and non-discriminatory supply of certain semiconductor products.
Notable vertical merger decisions include:
- Qualcomm/NXP (2018): SAMR imposed primarily behavioural remedies, including non-discrimination commitments, FRAND licensing obligations, and firewall requirements, reflecting the vertical nature of the transaction and SAMR’s willingness to accept conduct remedies for vertical concerns.
- Walmart/JD.com (2016): SAMR cleared this vertical transaction with conditions related to information exchange and competitive neutrality between online and offline channels.
- Broadcom/VMware (2023): SAMR cleared the transaction with conditions requiring Broadcom to maintain interoperability and non-discriminatory access commitments, reflecting an increasingly sophisticated approach to vertical remedies in technology markets.
These cases illustrate that while horizontal mergers typically require structural remedies, vertical mergers are more often cleared with behavioural conditions that preserve the transaction’s vertical integration benefits while addressing specific foreclosure or information exchange concerns.
Review timelines and procedural differences
The procedural timeline for horizontal and vertical merger reviews under China’s AML follows the same statutory framework, but horizontal mergers with significant competitive overlaps tend to proceed through more extensive review phases. A horizontal merger that raises prima facie competitive concerns is likely to advance from Phase I (30 days) to Phase II (90 days) and potentially Phase III (an additional 60 days), resulting in a total review period of up to 180 days. Vertical mergers, particularly those that do not raise significant market power concerns, are more likely to be cleared in Phase I or early Phase II.
The information requirements also differ. Horizontal merger notifications require detailed market share data, competitive overlap analysis, closeness of competition assessment, and evidence on entry barriers and expansion capabilities. Vertical merger notifications require analysis of upstream and downstream market structures, dependence of third parties on the merged entity’s inputs or outputs, and assessment of foreclosure risks. While both types of filing require substantial information, the analytical focus shifts significantly between horizontal and vertical cases.
Practical implications for foreign businesses
Foreign businesses planning mergers or acquisitions in China should consider the following guidelines when assessing horizontal versus vertical merger risk:
- Identify the competitive relationship early. Determine whether the transaction involves horizontal overlaps, vertical relationships, or both. Many transactions involve both horizontal and vertical elements, requiring a dual-track competitive analysis.
- Assess market shares and concentration. For horizontal overlaps, combined market shares above 15 to 25 percent are likely to trigger closer scrutiny. For vertical relationships, market shares above 25 to 30 percent in either the upstream or downstream market may raise foreclosure concerns.
- Prepare different remedy strategies. For horizontal concerns, prepare structural remedy proposals (divestiture of overlapping businesses). For vertical concerns, prepare behavioural remedy proposals (firewalls, non-discrimination commitments, access obligations). Hybrid transactions may require both.
- Build different timelines. Horizontal mergers with significant overlaps may require 90 to 180 days for review, while vertical mergers may be cleared in 30 to 60 days. Plan transaction timelines accordingly.
- Consider efficiencies arguments. Efficiency arguments are more likely to resonate in vertical merger cases, where elimination of double marginalization is a recognized pro-competitive benefit. In horizontal mergers, efficiency arguments carry less weight and require rigorous substantiation.
- Monitor SAMR guidance and case law. SAMR continues to refine its analytical frameworks for both horizontal and vertical mergers. Recent decisions in technology sector mergers suggest an evolving approach to vertical concerns, particularly regarding data integration and platform competition.
Strategic Insight: Foreign companies should note that SAMR’s review of horizontal mergers is increasingly aligned with international best practices, including the use of quantitative economic analysis, merger simulation models, and customer surveys. For vertical mergers, SAMR is actively developing its analytical toolkit and has shown interest in learning from EU and US case law on vertical foreclosure theories, while adapting the analysis to Chinese market conditions.
Conclusion
Horizontal and vertical mergers present fundamentally different competitive profiles under China’s AML, and SAMR’s approach to each reflects these differences in its analytical frameworks, enforcement priorities, and remedy design. Horizontal mergers are subject to more intensive scrutiny, a stronger preference for structural remedies, and a higher likelihood of conditional clearance or prohibition. Vertical mergers receive a more nuanced competitive analysis, with greater acceptance of behavioural remedies, more weight given to efficiency justifications, and, in many cases, unconditional clearance.
For foreign businesses, understanding this dichotomy is essential for effective merger control risk management in China. A transaction that raises significant horizontal overlaps requires early engagement with antitrust counsel, preparation of a credible divestiture proposal, and a realistic assessment of the review timeline. A purely vertical transaction, while not risk-free, is more likely to receive favourable treatment from SAMR, particularly if the parties can demonstrate that the merger will generate efficiency benefits that outweigh any potential foreclosure concerns. By understanding and preparing for the different analytical approaches that SAMR applies to horizontal and vertical mergers, foreign businesses can better navigate China’s merger control regime and achieve successful regulatory outcomes for their transactions.
