Post-Completion Governance: What Happens After the Deal Closes

The moment of completion in an M&A transaction — when shares change hands, completion accounts are signed, and the deal team exhales — is often treated as the finish line. In reality, it is the starting pistol for a critical phase of corporate administration that, if mishandled, can create legal exposure, regulatory penalties, and operational disruption for the new owners.

The first 30 days after completion are where governance either takes hold or falls apart. This article sets out the key workstreams that require immediate attention and explains why proper planning for post-completion administration should begin well before the deal closes.

Board Appointments and Resignations

The most immediate post-completion task is reconstituting the board. In a typical share acquisition, the seller's nominated directors resign and the buyer's nominees are appointed. This needs to happen on or immediately after completion, and the process must follow the company's articles of association and any provisions in the share purchase agreement.

Key considerations include:

• Timing of resignations. Seller-side directors should resign on completion, but care must be taken to ensure the company is never left without at least one director (or the minimum number specified in its articles).
• Board resolutions. Written resolutions or a board meeting should be held on completion to appoint new directors, accept resignations, change bank signatories, and update the registered office if required.
• Companies House filings. AP01 forms (appointment of director) and TM01 forms (termination of director) must be filed with Companies House within 14 days of the change. Late filings create a public record of non-compliance and, under the ECCTA reforms, may attract greater scrutiny.

Companies House Filings

Beyond director changes, completion typically triggers a series of Companies House filings that must be made within prescribed timeframes:

• AP01 / TM01: Director appointments and terminations (14 days)
• SH01: Return of allotment, if new shares have been issued as part of the transaction (one month)
• AD01: Change of registered office (takes effect on registration, but should be filed promptly)
• PSC notifications: Changes to persons with significant control must be notified within 14 days of the company becoming aware of the change, and filed at Companies House within a further 14 days
• Stock transfer forms: While not filed at Companies House, stamp duty on share transfers must be paid to HMRC within 30 days of execution

Bank Accounts and Mandates

Changing bank mandates is one of the most practically important — and frequently delayed — post-completion tasks. Until the bank mandate is updated, the outgoing directors may retain signing authority over the company's accounts, and the new directors may be unable to authorise payments.

The process typically involves:

• Notifying the bank of the change of ownership and the board changes
• Completing new mandate forms with specimen signatures for the incoming directors
• Providing the bank with completion documentation (SPA, board minutes, articles)
• AML/KYC checks on the new beneficial owners, which can take several weeks depending on the bank

For international acquirers, opening new UK bank accounts or updating existing mandates can be particularly time-consuming. Banks require extensive documentation and may apply enhanced due diligence procedures. Planning for this during the pre-completion phase can prevent cash flow disruption after the deal closes.

Registered Office Transfer

If the target company's registered office was at the seller's premises or at a service address associated with the seller's advisors, it will need to be moved. Under the ECCTA reforms, the registered office must be an "appropriate address" where documents can be acknowledged and received. A professional registered office service ensures continuity and compliance.

Statutory Books Handover

The seller's advisors should deliver the company's statutory books to the buyer on or shortly after completion. These include:

• The register of members (shareholders)
• The register of directors and secretaries
• The PSC register
• The register of charges (if maintained)
• Minutes of all board and shareholder meetings
• The company's certificate of incorporation, any certificates of change of name, and the current articles of association
• The company seal (if one exists)

In practice, statutory books are frequently incomplete, outdated, or missing entirely. This is one of the most common issues we encounter in post-completion onboarding. Where the books are deficient, a reconstruction exercise may be needed to bring them up to date before the new owner's governance framework can be properly implemented.

HMRC Notifications

Several HMRC notifications are triggered by a change of ownership:

• CT41G: If the acquired company needs to register for corporation tax (or update its details), a CT41G form should be submitted. This notifies HMRC of the company's accounting period, registered office, and the identity of the person responsible for the company's tax affairs.
• VAT registration: If the company is VAT-registered, HMRC must be notified of changes to the company's details, including changes to the principal place of business and the identity of the person responsible for VAT compliance.
• PAYE/NIC: If the company operates a payroll, HMRC must be notified of changes to the employer's details.

Payroll and TUPE

Where the acquisition involves employees — whether through a share purchase (where employees transfer automatically) or an asset purchase (where TUPE may apply) — the buyer must ensure that payroll obligations are properly managed from completion.

For share purchases, the existing payroll arrangements typically continue, but the buyer should review and update payroll contacts, tax references, and bank details. For asset purchases where TUPE applies, the buyer must set up new payroll arrangements and ensure that employee terms and conditions are preserved in accordance with the regulations.

Compliance Onboarding (AML/KYC)

The new owners will need to complete AML/KYC checks with all of the company's professional advisors, bankers, and counterparties. This includes:

• The company's accountants and auditors
• The company's solicitors
• Banks and financial institutions
• Registered office and company secretarial providers
• Any regulated counterparties (insurers, fund administrators, etc.)

This is an area where early engagement with a corporate services provider like Axsuma can significantly reduce the administrative burden. We handle the full compliance onboarding process, from collecting beneficial ownership information to completing all necessary KYC submissions on behalf of the acquired entity.

Ongoing Governance Framework

Once the immediate post-completion tasks are complete, the new owners should establish an ongoing governance framework for the acquired entity. This includes:

• Setting the board meeting calendar and reporting schedule
• Appointing company secretarial support to manage ongoing statutory compliance
• Establishing a compliance calendar for annual filings (confirmation statement, annual accounts, corporation tax return)
• Reviewing and updating the company's articles of association if needed
• Implementing group-wide governance policies (delegated authority, conflict of interest, whistleblowing)

The post-completion phase is where deals are either properly bedded in or left to drift. The administrative workstreams may lack the excitement of the negotiation and due diligence phases, but they are no less important. A well-executed post-completion programme protects the buyer's investment, ensures regulatory compliance, and establishes the governance foundation for the next phase of the entity's life. The time to plan for it is before the deal closes, not after.