Find Subsidiaries of a UK Company: Companies House Limits

A solicitor reviewing an acquisition target or an auditor testing group consolidation needs to map every downstream entity in a corporate group. The natural starting point is Companies House. You enter the parent company's name or registered number, open the register, and check the tabs.

You immediately hit a statutory limitation. Companies House contains no search bar, register, or filter that lists the companies a parent entity owns.

The public register records ownership in only one direction: upwards. You can verify who exercises significant control over the company in front of you, but you cannot ask the register to reveal that company's subsidiaries. To conduct a reliable parent company lookup or map a complete corporate structure chart, professionals must understand why this limitation exists and how to bypass it using statutory accounts and reverse register searches.

The One-Way Design of the Companies House Register

Part 21A of the Companies Act 2006, introduced via the Small Business, Enterprise and Employment Act 2015, created the UK register of Persons with Significant Control (PSC). Its statutory purpose is transparency of ultimate beneficial ownership. It forces individual UK operating entities to declare who controls them, preventing individuals from concealing their interests behind nominee arrangements or opaque corporate veils.

Because the regime was designed to uncover ultimate control, the reporting obligation sits entirely with the subsidiary entity. Under sections 790D and 790E of the Act, a company must take reasonable steps to identify its own registrable controllers and file that data using form PSC01, PSC02, or PSC04.

Consequently, the system operates as a bottom-up registry:

You can inspect Subsidiary Ltd and see that Parent Holdings Ltd holds 75% or more of the shares.
You cannot inspect Parent Holdings Ltd and view a register of companies in which it holds shares.

Typing a holding company name into the search bar returns only its own incorporation filings, filed accounts, confirmation statements, and its own upstream PSCs. The register does not maintain an index of downstream asset holdings.

If you need to know how to check if a company is a subsidiary, the answer on Companies House is straightforward: view that specific company's PSC tab. If you need to find all subsidiaries of a company, the registry interface offers no direct mechanism to help you.

Manual Methods to Find Subsidiaries and Their Limitations

Before digital registers and automated database parsing, corporate finance teams, insolvency practitioners, and investigative lawyers relied on three manual workarounds. Each method carries operational constraints and legal loopholes that introduce substantial risk during due diligence.

1. Group Accounts and the Section 409 Note

Under section 409 of the Companies Act 2006 and the Large and Medium-sized Companies and Groups (Accounts and Reports) Regulations 2008 (SI 2008/410), parent companies preparing consolidated group accounts must include a note disclosing:

The name of each subsidiary undertaking.
Its registered office address (or principal place of business if unincorporated).
The country of incorporation if outside the UK.
The identity and proportion of each class of shares held.

While this note should provide an audit-level picture of a group, relying on it for active legal due diligence, KYC verification, or lending assessments carries four distinct vulnerabilities:

1. The Reporting Time Lag: Under section 442 of the Companies Act 2006, a private company has nine months from its accounting reference date to file accounts. If a parent company's financial year ended on 31 December 2025, its accounts might not appear on the public register until 30 September 2026. A group structure chart derived solely from that balance sheet will be 9 to 21 months out of date. It misses mid-year acquisitions, newly incorporated special purpose vehicles (SPVs), hive-downs, and disposals.

2. Small Group Exemptions: Under section 383 of the Act, small groups that meet at least two of three criteria (aggregate turnover under £10.2m, aggregate balance sheet total under £5.1m, aggregate employees under 50) are exempt from preparing group accounts. Small parent entities file individual balance sheets. These individual balance sheets rarely detail subsidiaries beyond an aggregate unquoted investment figure, leaving the downstream structure completely invisible.

3. Dormant and Struck-Off Entities: Parent companies often clean their reported balance sheets by omitting dormant entities that they treat as immaterial, or entities undergoing voluntary strike-off under section 1000 of the Act. For a corporate litigator serving proceedings or an environmental consultant assessing historic operational liabilities, an unlisted dormant subsidiary can harbor major structural obligations.

4. Exemption via Section 410: Although less common, companies can apply to withhold subsidiary details if disclosing them would, in the opinion of the directors, be seriously prejudicial to the business, provided the Secretary of State agrees.

2. Sifting Confirmation Statements (Form CS01)

When conducting a parent company lookup UK, practitioners sometimes review the parent's annual confirmation statement (or historical annual returns). While the confirmation statement lists the shareholders of the target entity, it does not disclose the investments held by that entity. Reviewing the confirmation statement only confirms who owns the parent, not what the parent owns.

3. Word Searches on Registry Names

A basic manual technique involves searching Companies House for matching name stems. If the holding company is called "Acme Industrial Holdings Limited", an analyst might type "Acme Industrial" to identify "Acme Industrial Services Limited" or "Acme Industrial Logistics Limited".

This approach fails against modern corporate structuring. Acquired subsidiaries frequently preserve their original operating names for client retention, goodwill, or commercial contracts. Additionally, property development groups, private equity roll-ups, and renewable infrastructure funds routinely register SPVs with unbranded geographic names, project codes, or numeric identifiers (such as "Project Beta Solar Ltd" or "Plot 44 Management Company Ltd"). A stem search identifies only a fraction of the corporate family.

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The Engineering Solution: Reverse PSC Mapping

Because Companies House provides no downward search feature, mapping a full group structure requires an inverted index of the entire public register.

When a UK company incorporates a subsidiary or acquires a controlling interest, that subsidiary files a statutory notice: either a Form PSC02 (Notice of relevant legal entity with significant control) or updates via confirmation statement. The subsidiary declares that a corporate entity holds control, detailing whether that control exceeds 25%, 50%, or 75% of shares or voting rights, or includes the right to appoint or remove a majority of the board.

To perform an exhaustive subsidiary search Companies House records must be queried in reverse. Instead of searching inside the parent entity's file, the system examines every registered UK entity to find which ones cite that parent's company registration number (CRN) as an active Corporate PSC or Relevant Legal Entity (RLE).

[Ultimate Beneficial Owner]

| (Upstream control)

[Parent Holdings Ltd]

+------------------------+------------------------+

| (Reverse PSC match) | (Reverse PSC match) | (Reverse PSC match)

[Subsidiary One Ltd] [Subsidiary Two Ltd] [Midco Intermediate Ltd]

| (Tier 2 Reverse PSC)

[Project SPV Ltd]

This process operates systematically:

1. Identify the Target Parent: Isolate the parent entity's unique Companies House registration number. Relying on company names introduces errors caused by previous corporate names or typographical errors in filings.

2. Run Tier 1 Reverse Search: Interrogate the national register to locate all active companies that name the target CRN as a registrable legal entity or corporate PSC.

3. Map Indirect and Multi-Tier Subsidiaries: Corporate hierarchies are rarely flat. An operating subsidiary is frequently owned by an intermediate holding vehicle ("Midco"), which in turn is held by a top holding company ("Topco"). To compile an accurate company org chart, the reverse lookup must run recursively. Every subsidiary identified in Tier 1 is fed back through the engine to locate Tier 2 subsidiaries, repeating down through Tier 3, Tier 4, and beyond until no further corporate subsidiaries are found.

4. Trace Upstream to the Ultimate Beneficial Owner (UBO): Once the downstream tree is locked, the algorithm traces upward from the parent. It checks whether the parent has its own corporate PSCs, continuing upward until it hits natural persons, listed PLCs, or foreign registrations.

This bidirectional process links the ultimate beneficial owner to the lowest operational tier, constructing a fully verified corporate org chart.

For a broader look at corporate family legal arrangements, read [our guide to company group structures in the UK](/company-group-structure-uk).

Step-by-Step Method: How Professionals Map a Corporate Group

When corporate lawyers, credit analysts, and M&A advisers need to establish a verified group structure chart for a transaction or due diligence review, they follow this analytical framework.

Step 1: Establish the Legal Perimeter

Begin with the target company's registered number. Confirm its current operational status on the public register (active, in administration, or liquidation). If the entity was recently involved in a merger or capital reorganization, review its filing history for Form NM01 (Notice of change of name) to ensure historical corporate references are accounted for.

Step 2: Review the Most Recent Filed Accounts

Download the latest full group or individual accounts. Inspect the accounting policies to verify the financial framework used (UK GAAP, FRS 102, or IFRS 10). If group accounts are prepared:

Locate the "Investments in Subsidiaries" or "Related Undertakings" note.
Extract every subsidiary name, company number, and percentage of equity held.
Cross-reference this list against the active Companies House register to confirm if any entities have been struck off, dissolved, or renamed since the accounting reference date.

Step 3: Check Charges and Guarantees

Parent companies often cross-guarantee the debts of their subsidiaries or enter into debentures covering group assets. Check the charges register on the parent entity. Look for fixed and floating charges created via Form MR01 that list "all present and future subsidiaries" or contain charging clauses over the shares of specific operating units. You can conduct a targeted [company charge check](/charge-check) to verify group security arrangements and identify debentures covering subsidiary share capital.

Step 4: Execute a Multi-Tier Reverse PSC Lookup

Because filed accounts are retrospective, execute a reverse PSC search across the live register. Identify all operational and asset-holding companies that cite the parent as a controlling entity today. Ensure the search parses direct holdings (where the parent owns the shares outright) and indirect holdings (where control is routed via intermediary holding companies).

Step 5: Verify Minority Stakes and Non-Controlled Associates

The PSC register only captures entities where control exceeds the statutory threshold of 25%. If the parent company holds an equity stake between 1% and 24.9% (such as an investment in an associate or a joint venture vehicle), that stake will not trigger a mandatory PSC notification. Review the balance sheet asset investments to capture these minority holdings.

Step 6: Set Continuous Monitoring

Corporate structures change during transactions. Entities form new SPVs to ring-fence contract liabilities, acquire competitors, or transfer assets through intra-group reorganisations. To protect ongoing due diligence, set up [free company monitoring](/free-company-monitoring) on the parent and key operating subsidiaries. This ensures automated alerts if new PSC filings, share allotments, or officer changes take place before completion.

Worked Scenario: Uncovering the Hidden Subsidiary

Consider an anonymised corporate finance scenario. Private equity investors are preparing a debt-refinancing package for a medium-sized UK logistics and warehousing group.

The parent entity, a UK private limited company, files unaudited financial statements claiming exemptions under section 477 of the Companies Act 2006 for small companies. Its balance sheet shows net assets of £4.8m, with an entry under fixed asset investments titled simply "Shares in group undertakings: £150,000". There is no section 409 note, no consolidation, and no list of subsidiaries in the document.

The lender's legal team needs to know what physical real estate and haulage assets are held across the group to structure an effective debenture. A standard Companies House search on the parent reveals its two directors and an individual ultimate beneficial owner owning 100% of the share capital. The register offers no downward visibility.

A manual name search for the parent's brand name returns three active trading companies. The transaction team might assume this represents the entire corporate footprint.

However, a full reverse PSC search tells a very different story:

[Parent Company Ltd] (CRN: 09876543)

├── Tier 1: [Brand Logistics Ltd] (100% control, active)

├── Tier 1: [Brand Fleet Services Ltd] (100% control, active)

├── Tier 1: [Brand Warehousing Ltd] (100% control, active)

└── Tier 1: [Northern Distribution Properties Ltd] (100% control, active)

└── Tier 2: [Project Yard SPV Ltd] (75-100% control, active)

The reverse PSC engine identifies a fourth, Tier 1 subsidiary: an unbranded asset-holding vehicle named "Northern Distribution Properties Ltd", acquired three years prior. More importantly, it uncovers a Tier 2 subsidiary owned through that property vehicle: "Project Yard SPV Ltd".

Project Yard SPV Ltd holds the freehold title to a prime railhead terminal, subject to a pre-existing mortgage. Without running a reverse PSC lookup, the lender's security team would have missed the primary physical asset and its prior encumbrance, mispricing the risk of the transaction.

Practical Challenges in Tracing Complex Groups

While reverse PSC indexing provides the most accurate view of UK group architectures, corporate investigators must account for several structural edge cases.

1. Joint Ventures and Consortia (The 25% Threshold)

Under schedule 1A of the Companies Act 2006, the PSC regime only triggers if a person or entity crosses statutory thresholds:

Holding more than 25% of shares.
Holding more than 25% of voting rights.
Holding the right to appoint or remove a majority of the board.
Exercising significant influence or control.

If a parent company owns exactly 25% or less of a joint venture vehicle, it is not legally required to appear on that vehicle's PSC register unless it exercises significant influence through contractual provisions (such as shareholder agreements or veto rights). In these instances, the relationship will only be discoverable via the target's register of members (accessible at its registered office under section 116 of the Act) or detailed balance sheet disclosures.

2. Offshore and Overseas Entities

Where a UK company is owned by an offshore entity (for example, in Jersey, Guernsey, the British Virgin Islands, or Delaware), the Companies House PSC register identifies the offshore entity as the corporate controller only if it is a registrable legal entity. Under section 790C, a legal entity is registrable in relation to a company only if it is subject to its own statutory disclosure regime or has shares admitted to trading on a regulated market.

If an offshore holding vehicle does not qualify as a registrable legal entity, the UK company must look straight through it and declare the underlying natural persons who ultimately own or control it. While the Register of Overseas Entities covers foreign entities holding UK real estate, general foreign corporate subsidiaries falling below holding structures require cross-border registry searches in their home jurisdictions.

3. Limited Liability Partnerships and Scottish Limited Partnerships

UK Limited Liability Partnerships (LLPs) are corporate bodies and are subject to their own PSC regime under the Limited Liability Partnerships (Register of People with Significant Control) Regulations 2016. A UK limited company can be a member of an LLP, and that LLP will file PSC notifications naming the parent if it holds significant control over the LLP's management rights.

Scottish Limited Partnerships (SLPs) also fall under PSC disclosure requirements pursuant to the Scottish Partnerships (Register of People with Significant Control) Regulations 2017. When tracing group architectures, investigators must check both general corporate registers and partnership filings to identify auxiliary trading vehicles.

How Corp Intel Solves the Downstream Blindspot

Professional advisers routinely need to produce a reliable, verified corporate org chart for board packs, investment committees, or compliance files. Doing this manually requires hours of manual cross-referencing: pulling accounts, checking notes, searching trading names, and inspecting individual company records one by one.

Corp Intel maintains a local mirror of the complete UK register of companies and the full, continuously updated PSC register. We invert the register: our search engine processes every UK company that names your target entity as a corporate PSC or relevant legal entity, recursively crawling downstream tier by tier until every linked subsidiary is mapped.

Instead of piecing together out-of-date accounts and fragmented filings, you can generate a complete [Corporate Org Chart](/corporate-org-chart) for £25.

Sourced directly from the official Register of Companies and the live PSC register, the resulting dated PDF provides:

An exhaustive map of all downstream subsidiaries, multi-tier holdings, and intermediate holding vehicles.
Upstream tracing from the parent company through intermediate entities to the Ultimate Beneficial Owners (UBOs).
Specific equity brackets and nature-of-control indicators for every entity in the tree.
Incorporation dates, registered office addresses, and current filing statuses.

The document provides legal and financial professionals with an audit-ready, dated snapshot of a corporate family tree, eliminating the statutory blindspots inherent in the public registry search bar.

For Conveyancers, Lawyers and Lenders

Verifying an entire corporate structure is a mandatory compliance requirement under the Money Laundering, Terrorist Financing and Transfer of Funds Regulations 2017 (Regulation 28), which obliges regulated firms to identify the ownership and control structure of a corporate client before entering a business relationship. Missing an undisclosed subsidiary or failing to identify an intermediate holding entity introduces severe KYC compliance failures, invalidates standard cross-guarantee provisions, and risks missing prior floating charges.

Before advising on transactions, completing client onboarding, or drafting security documentation, lawyers and risk teams can order a dated [Corporate Org Chart](/corporate-org-chart) directly from Corp Intel to document their group due diligence file.

FAQ

Can I find a company's subsidiaries directly on Companies House?

No. The Companies House search interface only allows you to search upwards to determine who owns or controls a specific company. It does not provide a feature, filter, or index showing which other entities a parent company owns. Finding subsidiaries directly on the public registry requires inspecting retrospective accounts or running a reverse PSC search.

What is a reverse PSC search?

A reverse PSC search is an engineering technique that queries the entire UK corporate registry from the bottom up. Instead of looking at the parent company to see what it owns, the search identifies every UK company that has filed a statutory notice naming that parent company as an active Person with Significant Control (PSC) or Relevant Legal Entity (RLE).

How old is the subsidiary data inside filed group accounts?

Accounts data is frequently between 9 and 21 months out of date. Private companies in the UK have up to nine months from their accounting reference date to file their annual statements. If an entity is acquired, incorporated, or sold mid-year, that structural change will not appear on the public register via statutory accounts until the subsequent financial year is closed and filed.

What is the difference between an Ultimate Beneficial Owner (UBO) and a PSC?

In the UK, a Person with Significant Control (PSC) is the statutory term defined by the Companies Act 2006 for an individual or relevant legal entity that holds more than 25% of shares or votes, holds board appointment rights, or exercises significant influence. An Ultimate Beneficial Owner (UBO) is the broader AML and financial regulatory term representing the natural living person who ultimately reaps the economic benefits or exercises terminal control over a group, tracing up through all intermediate corporate parents.

Do small companies have to disclose their subsidiaries in their annual filings?

Generally, no. Under section 383 of the Companies Act 2006, groups qualifying as small are exempt from preparing consolidated group accounts. Small parent companies file individual accounts that typically report only a consolidated, unquoted investment balance on their balance sheet without disclosing individual subsidiary identities, registration numbers, or ownership percentages under section 409.

Can a foreign company be identified as a subsidiary using UK registers?

No. The UK PSC register only applies to UK-incorporated entities. If a UK parent company owns a subsidiary in an overseas jurisdiction (such as Germany, the United States, or Singapore), that overseas subsidiary does not file notifications with Companies House. Overseas subsidiaries can only be confirmed via the parent's filed section 409 accounts disclosures or by searching the corporate registry of the specific foreign jurisdiction.