Types of mergers

Mergers and acquisitions are commonly classified by the economic relationship between the two firms. The category affects the expected synergies and the level of antitrust scrutiny.

Horizontal merger

A horizontal merger combines two companies in the same industry that are often direct competitors — for example two airlines or two banks. The aim is usually economies of scale, increased market share and the elimination of duplicate costs. Because horizontal deals reduce the number of competitors, they attract the closest competition-authority review.

Vertical merger

A vertical merger combines firms at different stages of the same supply chain, such as a manufacturer and a key supplier or distributor. The goals include securing supply, capturing margin along the chain and improving coordination — known broadly as vertical integration.

Conglomerate merger

A conglomerate merger joins companies in unrelated businesses. A pure conglomerate involves firms with nothing in common; a mixed conglomerate seeks product or market extensions. The rationale is diversification, though conglomerates can trade at a "conglomerate discount" if investors prefer focused companies.

Congeneric, market- and product-extension mergers

• Congeneric (concentric) merger — firms in related industries that serve the same customers but do not directly compete (e.g. a bank and an insurer).
• Market-extension merger — companies selling the same products in different geographic markets.
• Product-extension merger — companies selling related products in the same market, broadening a product line.

Why the classification matters

The type of merger shapes both where value is expected to come from — cost synergies dominate horizontal deals, while vertical and product-extension deals lean more on revenue synergies — and the regulatory path, since horizontal combinations of close competitors are the most likely to be challenged.