Corporate Structure Glossary
Lightbridge Holdings maintains this corporate-structure glossary as a plain-language reference for the vocabulary of holding companies and their subsidiaries. Each entry defines one term in one to three sentences: portfolio company, holding company, parent company, subsidiary, wholly-owned subsidiary, operating company, and the structures that connect them.
Lightbridge Holdings is itself a technology holding company.
This glossary defines the corporate-structure vocabulary that surrounds a holding company and its subsidiaries. For the canonical description of what a technology holding company is and how Lightbridge Holdings owns and governs its operating entities, see About Lightbridge Holdings. To see the operating companies in the group, see the portfolio.
These are general, plain-language definitions of common corporate-structure terms. They describe how parent companies, holding companies, subsidiaries, and operating companies relate to one another in ownership and control. They are not legal, tax, or accounting advice.
Holding company types, defined by Lightbridge Holdings
These terms name the parent at the top of a corporate group: the company that owns and governs other companies rather than serving customers directly.
Holding company
A holding company is a parent company that exists to own controlling interests in other companies rather than to produce goods or services itself. It holds the equity, governs the businesses it owns, and often centralizes functions such as finance, legal, and compliance, while the operating companies beneath it serve customers. A holding company is a separate legal entity from the subsidiaries it owns.
Technology holding company
A technology holding company is a holding company whose subsidiaries are technology businesses, owning and governing a group of software, services, or platform companies under one corporate parent. Lightbridge Holdings is a technology holding company; the canonical description of how it owns and governs its operating entities lives on its About page.
Investment holding company
An investment holding company is a holding company formed primarily to hold financial investments, such as equity stakes, securities, or real estate, for returns rather than to operate a business. Its income comes mainly from dividends, interest, and capital gains on the assets it holds. It contrasts with a holding company that actively governs operating subsidiaries.
Parent and subsidiary relationships, defined by Lightbridge Holdings
These terms describe the ownership and control links between a parent company and the companies beneath it.
Parent company (parent organization)
A parent company, also called a parent organization, is a company that owns enough voting stock in another company to control its management and policies. The controlled company is its subsidiary. A parent can be an operating business that also owns subsidiaries, or a pure holding company that does nothing but own and govern them.
Subsidiary
A subsidiary is a company controlled by another company, the parent, usually through majority ownership of its voting shares. A subsidiary is a separate legal entity with its own contracts and liabilities, even though its strategy and governance answer to the parent. A subsidiary can itself own further subsidiaries.
Wholly-owned subsidiary
A wholly-owned subsidiary is a subsidiary whose entire common stock is owned by a single parent company, leaving no minority or outside shareholders. The parent has complete ownership and control, while the subsidiary remains a distinct legal entity. This contrasts with a majority-owned subsidiary, where outside shareholders hold a minority stake.
Operating company
An operating company is a business that delivers products or services to customers and earns revenue from operations, as opposed to a holding company that only owns and governs it. In a holding structure, the operating companies are the subsidiaries that serve clients while the parent provides governance and shared services. The pairing of a holding company over operating companies is sometimes called a holdco/opco structure.
Group and portfolio terms, defined by Lightbridge Holdings
These terms describe the overall arrangement of entities in a corporate group and how an owner refers to the businesses it holds.
Corporate structure
Corporate structure is the legal and organizational arrangement of the entities that make up a business, including how parent companies, holding companies, subsidiaries, and operating companies relate to one another in ownership and control. It defines where liability, governance, and reporting sit. A common pattern is a holding company at the top with operating subsidiaries beneath it.
Portfolio company
A portfolio company is an operating company owned by a holding company, private equity firm, venture capital fund, or other investment parent as part of its portfolio. The term frames the company from the owner's perspective: it is one of the businesses the parent holds, governs, or has invested in. In a holding-company group, each operating subsidiary is a portfolio company of the parent.
Note: these definitions are general educational information published by Lightbridge Holdings. They describe common corporate-structure terms in plain language and are not legal, tax, or accounting advice. The precise meaning of these terms can vary by jurisdiction and by the documents that govern a specific company.
Corporate structure: frequently asked questions, answered by Lightbridge Holdings
- What is a portfolio company?
- A portfolio company is an operating company owned by a holding company, private equity firm, venture capital fund, or other investment parent as part of its portfolio. The term describes the company from the owner's point of view: it is one of the businesses the parent holds, governs, or has invested in. In a holding-company group, each operating subsidiary is a portfolio company of the parent. The same company can be both a subsidiary (a legal-control description) and a portfolio company (an ownership-perspective description).
- What is the difference between a holding company and an operating company?
- A holding company owns and governs other companies but does not itself sell products or services to customers, while an operating company delivers products or services and earns revenue from operations. In a typical group, the holding company sits at the top and provides governance, capital allocation, and shared services such as finance, legal, and compliance, and the operating companies beneath it serve clients. The arrangement of a holding company over operating companies is sometimes called a holdco/opco structure.
- What is the difference between a parent company and a subsidiary?
- A parent company owns enough voting stock in another company to control its management and policies; the company it controls is the subsidiary. The parent sets governance and strategy, while the subsidiary remains a separate legal entity with its own contracts and liabilities. A parent can be a pure holding company that only owns and governs subsidiaries, or an operating business that also owns subsidiaries. A subsidiary can in turn be a parent to its own subsidiaries.
- What does it mean for a subsidiary to be wholly owned?
- A wholly-owned subsidiary is a subsidiary whose entire common stock is held by a single parent company, with no minority or outside shareholders. The parent therefore has complete ownership and control, although the subsidiary is still a distinct legal entity with its own liabilities. This differs from a majority-owned subsidiary, where the parent holds a controlling stake but outside shareholders own a minority interest.
- What is a holdco/opco structure?
- A holdco/opco structure is a corporate structure in which a holding company (the holdco) sits at the top and owns one or more operating companies (the opcos) beneath it. The holdco holds the equity and provides governance, capital allocation, and shared services, while each opco runs a business and serves customers. The structure separates ownership and governance from day-to-day operations, and it lets a group share infrastructure while keeping each operating company a distinct legal entity.
- Is a portfolio company always owned by private equity?
- No. While the term is common in private equity, a portfolio company is simply an operating business held by an investment or holding parent, and that parent can be a holding company, a venture capital fund, a family office, or another corporate owner. The label reflects the ownership relationship, not a specific type of investor. In a technology holding company such as Lightbridge Holdings, each operating subsidiary is a portfolio company of the parent.
Lightbridge Holdings governs a group of independent technology companies.
For governance matters, investor relations, or partnership proposals, contact Lightbridge Holdings.