IT Post-Merger Integration for M&A

Integrate securely after closing

We fully integrate the IT of acquired companies with a focus on security, so the deal delivers its value without opening new doors for attackers.

Day-1 readiness and 100-day plan
Full IT integration with a security focus
Also for carve-outs and buy-and-build

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Two intcube team members in a workshop with sticky notes on the wall

At closing, you take over the IT and its risks.

Networks are connected, accounts merged and applications replaced, often under time pressure and with transitional service agreements (TSA). Attacks on a company rise right after an acquisition, and every unchecked connection can carry an add-on’s risks into the whole group.

We combine full IT integration with our cybersecurity expertise: infrastructure, applications, organisation and contracts are brought together, and security is part of the plan from the start.

Building on the due diligence findings, we create a clear integration plan with sequence, costs and owners, so the integration reaches its synergy targets without weakening the group’s security.

Integration as an attack window
Unchecked connections between networks
Delayed synergies and duplicate costs

Integrate fully, secure from day 1

What must work and be protected on day one? In what order are networks, identities and applications merged? Which systems are replaced, which contracts terminated? And which minimum standards apply before a company is connected to the group?

We plan and carry out the integration, on our own or together with partners such as Code & Co. and ERNW.

With int[cube]'s IT post-merger integration:

Day-1 readiness

Access, communication, emergency contacts and minimum security before networks are connected

Integration plan and 100-day plan

Sequence, dependencies, costs and owners, based on the due diligence

Identities, networks and applications

Merge directories and accounts, couple networks securely, replace duplicate systems

Security baseline for the group

Uniform, measurable minimum standards for all companies, including future add-ons.

Carve-outs and TSA exit

Standalone IT and security for carved-out units, in time before the transitional services end.

Integration that creates value and does not make the group easier to attack.

Security from the start

We integrate with an attacker’s eye: every connection, every access and every interim solution is checked for risks before it goes live.

Straight from the due diligence

If we did the due diligence, we already know the weaknesses and red flags. The integration plan starts there, without a new inventory.

Strong partner network

For technology and product topics we work with Code & Co., for incident response and complex technical security with ERNW and with further partners.

Plan the integration before closing.

Enhance your cybersecurity now

Protect the value of your deal after closing

We combine IT integration and cybersecurity in one plan that delivers synergies and makes the group more secure.

Resources for deal teams

Cyber Due Diligence Checklist for Private Equity Deals: a practical checklist covering governance, identity, external attack surface, product security, data protection, incident response, third-party risk, backups, and the post-close 100-day plan. Use it before signing.

The Cyber Resilience Act for private equity: who is affected, the 24-hour reporting duty since September 2026, the December 2027 deadline and what to check in due diligence.

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With as a partner

Integrate IT fully, with security built in
Start day one with clear access and minimum security
Use the due diligence findings directly for the integration
Have a repeatable process for carve-outs and buy-and-build

Frequently asked questions

What is IT post-merger integration?

Bringing the IT of an acquired company together with that of the buyer or the group after closing: infrastructure, networks, identities, applications, organisation and contracts. int[cube] supports full IT integration with a focus on security.

When should IT integration be planned?

Before closing. The due diligence findings are the basis; day-1 measures and a 100-day plan should be ready at closing.

How is IT PMI different from IT due diligence?

Due diligence assesses before the purchase which IT and cyber risks come with the deal. Post-merger integration carries out what follows from it after closing. See cyber vs IT vs tech due diligence.

Does int[cube] support carve-outs?

Yes. For carve-outs we build standalone IT and security for the carved-out unit and replace the transitional service agreements (TSA) in time.

Does int[cube] work alone or with partners?

Both, depending on scope: on our own or with partners such as Code & Co. for technology and product and ERNW for incident response and complex technical security. More about our partners.

How does integration fit into the investment lifecycle?

It is the step between due diligence and the holding period. How we support private equity firms from scouting to exit is described on cybersecurity for private equity firms.

Integrate without new risks

Book a conversation with Dror-John Röcher and learn how your next integration succeeds securely.

Book a call now

Questions in advance? Write to us!

Dror-John Röcher

Founding Partner and CEO