Svyazinvest's shareholdings in its main subsidiaries, usually 38%, carry voting control because each subsidiary has 25% of its stock issued in non-voting form.

ECONOMIST: Russian privatisation

The goal of regulators is to develop a unique identifier for each HSBC or Citi subsidiary around the world in a consistent fashion that can be rolled up for a comprehensive view of the institution.

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Each of these companies is a subsidiary of Koch Industries.

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Not much: Enron and Utilicorp's Aquila Energy subsidiary in Omaha, Nebraska have each executed only about 100 trades since the market began in late 1996.

FORBES: Betting against God

Employees of each company hold a minority stake in that subsidiary, and so have a powerful motive to sell services to one another, as well as to outside customers.

FORBES: Silicon Prairie Dog

For example, a U.S. company that receives significant dividends each year from a wholly-owned Japanese subsidiary would no longer pay Japan a 10% withholding tax on dividends. (Some dividends probably will still be taxed at 5%).

FORBES: U.S.-Japan Treaty Will Cut Double Taxation

Because eBay handles its own payment processing through subsidiary PayPal, the company can track each step of a sale.

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Not much: Enron and Utilicorp's Aquila Energy subsidiary in Omaha, Nebr. have each executed only about 100 trades since the market began in late 1996.

FORBES: Betting against God

Spaarbeleg, a savings and investment subsidiary of Aegon, a Dutch financial-services group, receives more than 2m calls each year at its call centre.

ECONOMIST: Enterprise software