Consolidation (business) in the context of "Merger and acquisition"

Mergers and acquisitions (M&A) are business transactions in which the ownership of a company, business organization, or one of their operating units is transferred to or consolidated with another entity. They may happen through direct absorption, a merger, a tender offer or a hostile takeover. As an aspect of strategic management, M&A can allow enterprises to grow or downsize, and change the nature of their business or competitive position.

A corporate group, company group or business group, also formally known as a group of companies, is a collection of parent and subsidiary corporations that function as a single economic entity through a common source of control. These types of groups are often managed by an account manager. The concept of a group is frequently used in tax law and accounting and (less frequently) company law to attribute the rights and duties of one member of the group to another or the whole. If the corporations are engaged in entirely different businesses, the group is called a conglomerate. The forming of corporate groups usually involves consolidation via mergers and acquisitions, although the group concept focuses on the instances in which the merged and acquired corporate entities remain in existence rather than the instances in which they are dissolved by the parent. The group may be owned by a holding company which may have no actual operations.

The Computing-Tabulating-Recording Company (CTR) was a holding company of manufacturers of record-keeping and measuring systems. The company would ultimately become known as IBM.

In 1911, the financier and noted trust organizer Charles R. Flint, called the "Father of Trusts", amalgamated (via stock acquisition) four companies: Bundy Manufacturing Company, International Time Recording Company, the Tabulating Machine Company, and the Computing Scale Company of America; creating a fifth company – the Computing-Tabulating-Recording Company.

This list comprises the world's largest companies by consolidated revenue, according to the annually ranked Fortune Global 500 published by Fortune magazine, as well as other sources. Out of 50 largest companies 22 are American, 17 Asian and 11 European.

This is limited to the largest 50 companies, all of which have annual revenues exceeding US$130 billion. This list is incomplete, as not all companies disclose their information to the media or general public. Information in the list relates to the most recent fiscal year (mostly FY 2023 or 2024).

The Great Western Railway (GWR) was a British railway company that linked London with the southwest, west and West Midlands of England and most of Wales. It was founded in 1833, received its enabling act of Parliament on 31 August 1835 and ran its first trains in 1838 with the initial route completed between London and Bristol in 1841. It was engineered by Isambard Kingdom Brunel, who chose a broad gauge of 7 ft (2,134 mm)—later slightly widened to 7 ft 1⁄4 in (2,140 mm)—but, from 1854, a series of amalgamations saw it also operate 4 ft 8+1⁄2 in (1,435 mm) standard-gauge trains; the last broad-gauge services were operated in 1892.

The GWR was the only company to keep its identity through the Railways Act 1921, which amalgamated it with the remaining independent railways within its territory, and it was finally merged at the end of 1947 when it was nationalised and became the Western Region of British Railways.