Share Deal vs Asset Deal and Client Consent in Mergers

Get Client Transfer Right in a Bank Merger

Germany lost 622 banks in ten years. A share deal, merger or asset deal decides which clients must consent and which records move with them.

Alexander Kiel

Business Analyst · Banking & Wealth Management

24.01.2026 · 7 MIN READ · BUSINESS INTEGRATION

ON THIS PAGE

1. Check Share Deal vs Asset Deal

2. Protect Client Data Before Signing

3. Plan the Client Transfer Communication

4. Get Consent That Holds Up

5. Document Every Client Decision

6. Follow Up With Silent Clients

Sample case: Deutsche Bank

In short

FAQ

The Bundesbank counted 1,990 credit institutions in Germany in 2014 and 1,368 at the end of 2024, 35 fewer than a year earlier. Behind each bank that disappears through a merger or sale is a client transfer. The bank merger is signed in months, but every client relationship has to move with its contracts, consents and records. Whether the deal is a share deal or an asset deal decides how much of that each client must sign.

The latest example is in Hamburg. In June 2026, Rothschild & Co agreed to acquire 100 per cent of the shares in Marcard, Stein & Co, a private bank, subject to regulatory approvals. For clients, such a deal is good news only if they understand what changes, agree where they must and find their files complete on the first day.

Systems move data. Letters, consents and records move the relationship. Does your bank know which clients must agree before their contracts can move?

Comparison of share deal, merger and asset deal in Germany, showing what moves, whether client consent is needed and what happens to client data, with the asset deal highlighted as the route that usually needs each client's agreement

STEP 1

Check Share Deal vs Asset Deal

Start with the deal structure, because it decides what clients must do. In a share deal, the bank stays the same legal entity and its contracts stay where they are. In a merger, the contracts pass to the acquiring bank by law. In an asset deal, each client relationship is transferred on its own, which usually needs the client.

German law is explicit for mergers: under § 20 of the Transformation Act, assets and liabilities pass to the acquiring entity on registration. The German data protection authorities state that a share deal generally involves no transfer of personal data, while an asset deal needs a closer look. My article on transferring clients between banks covers the perimeter and wave plan around this choice.

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Confirm the deal structure for each booking centre and entity

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List which contracts pass by law and which need consent

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Ask legal counsel to confirm the route in each country

Does your project plan show which clients move by law and which must sign?

Keep in mind: The route can differ by country. A Luxembourg booking centre in a German deal may follow different rules.

STEP 2

Protect Client Data Before Signing

Due diligence and migration planning create pressure to share client lists early. Resist it. Until the deal is signed and the legal basis is clear, the buyer should work with anonymised or aggregated data, not names, balances and documents.

The German data protection authorities consider the transfer of personal data before signing generally not permissible, with narrow exceptions such as consent. Banking secrecy adds a second limit. In Luxembourg, Article 41 of the Law on the financial sector sets a professional secrecy obligation for information entrusted to banks and their staff.

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Share anonymised client data until the legal basis is clear

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Set up a clean team for sensitive client information

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Log every data set handed over to the buyer

Who in your team signs off before a client list leaves the bank?

Keep in mind: Secrecy rules differ between Germany, Luxembourg and Switzerland. Check them for each booking centre, not only for the head office.

STEP 3

Plan the Client Transfer Communication

Clients should hear about the move from their relationship manager, not from the press. Brief relationship managers first, then send one letter per segment: what changes, what stays, when and what the client must do. In 2017, I supported a branch closure in Zurich and the transfer of its clients and assets to the Luxembourg head office, with uninterrupted service for portfolios of €3 to 20 million.

ESMA asked firms restructuring for Brexit to inform clients as soon as possible, once available, in plain language. Clients should also learn whom to contact. My article on building the integration team before day one shows how to assign who drafts, approves and sends each letter.

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Brief relationship managers before the first letter goes out

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Write one letter per client segment with dates and actions

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Name one contact point for every client question

Could a client explain your transfer letter to a family member in two sentences?

Keep in mind: Every letter version is a record. Keep the final text, the send date and the recipient list for each wave.

STEP 4

Get Consent That Holds Up

Where clients must agree, an unanswered letter is not agreement. Ask for an active yes in a form you can prove later: a signature, a confirmed online click or a recorded call. Ask separately for anything beyond the transfer itself, such as new direct debit mandates.

Germany's Federal Court of Justice ruled in April 2021 that banks may not treat a customer's silence as acceptance of far-reaching contract changes. The data protection authorities add that the buyer needs new direct debit mandates and informed, express consent for special categories of data such as health data.

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Ask for an active yes and never rely on silence

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Separate transfer consent from marketing and data consents

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Store each consent with its date, channel and wording

Could your bank prove today which consent form each client signed?

Keep in mind: This is not legal advice. Consent rules depend on the country, the deal structure and the contract, so have counsel confirm them.

STEP 5

Document Every Client Decision

Every client ends the transfer in one of a few states: moved, moved with changed terms, objected, closed or not reached. Record that state per client, with the evidence behind it. Use the same pass to close KYC gaps, because the receiving bank owns them from day one.

German anti-money laundering law requires records and supporting documents to be kept for five years unless other rules set a longer period. Data of ended contracts may pass to the buyer only for statutory retention, kept apart from active client data. My article on running a KYC refresh without a backlog shows how to close KYC gaps at scale.

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Give every client one documented end state

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Close KYC gaps before the client reaches the new bank

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Keep archived client data apart from active records

How many of your client files would pass the buyer's KYC check without new documents?

Keep in mind: The transfer log is also your audit trail. Auditors may ask for it long after the project team has gone.

STEP 6

Follow Up With Silent Clients

Some clients will not answer, however clear the letter. Plan reminders through a second channel and a personal call before each deadline. Decide early what happens to clients who never reply: a later wave, a restricted account or an exit.

Silence has limits in law. The German data protection authorities consider an objection period of about six weeks appropriate in some asset deal cases. In Luxembourg, a bank account counts as inactive after 10 years and the bank must then file to consign its assets to the State Treasury.

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Send reminders through a second channel before each deadline

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Call every non-responding client with significant assets

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Agree in advance what happens to clients who never reply

What happens in your plan to a client who has not opened any letter?

Keep in mind: Some silent clients have moved abroad or died. Check addresses and open inheritance cases before the final deadline.

What We Don't Understand About Trust | Onora O'Neill (Philosopher and Member @ House of Lords)

SAMPLE CASE

Deutsche Bank

Deutsche Bank began integrating Postbank back in 2008. In 2023, it moved 50 billion records of 12 million Postbank customers onto its own platform. The CEO called it one of the largest IT migration projects in European banking.

The data moved, but many clients could not get through. BaFin reported disruptions to online banking, limited telephone service and long processing times for account attachment and inheritance matters. On 29 September 2023, it appointed a special representative to monitor the bank. Complaints about banks to BaFin rose from 14,760 in 2022 to 27,536 in 2023. A large share of the service complaints concerned one institution.

Deutsche Bank added temporary staff and automation. By late October 2023, it had reduced the operational backlog by about two thirds, booked about €25 million of provisions in the third quarter and expected €30 to 35 million of extra remediation spend.

Key takeaway: A client transfer is finished when clients can reach their bank, not when the data has moved. Plan service capacity, letters and follow-up for the enquiries every move creates.

"We successfully migrated 50 billion records of 12 million Postbank customers; however, we saw unexpected levels of client enquiries which led to backlogs."

Christian Sewing (CEO @ Deutsche Bank)

In Short

A client transfer in a bank merger starts on paper. Know whether it is a share deal, merger or asset deal, protect client data until signing, brief relationship managers before letters go out, ask for consent that holds up, document every client decision and follow up with clients who stay silent.

The result is a client book that moves complete: every client informed, every consent provable and every file ready for the receiving bank's checks on the first day.

Frequently Asked Questions

Do clients have to agree in a share deal or asset deal?

Not always. In a share deal, no: the bank stays the same legal entity and the contracts stay where they are. In a legal merger, contracts pass to the acquiring bank by law, so clients do not need to agree, although they must be told about any changes. In an asset deal, each relationship is transferred separately and usually needs the client's agreement. The rules depend on the country and the deal structure, so legal counsel should confirm them.

Can a bank share client data with a buyer before signing?

Generally not. German data protection authorities consider the transfer of personal data before signing inadmissible, apart from narrow exceptions such as consent. Banking secrecy adds a second limit. Before signing, buyers should work with anonymised or aggregated data. Names, balances and documents follow only once the legal basis for the transfer is clear and documented in writing.

How long must a bank keep client transfer records?

At least as long as the longest retention rule that applies. In Germany, anti-money laundering records must be kept for five years. Other laws can require longer periods. Keep the letters, consent evidence and client decision log together, so that the receiving bank can later show auditors and supervisors how each client moved and on what basis.