Mark Emdin
April 2026
When organisations talk about mergers, they usually mean M&A. And that is where all the attention goes with a focus on due diligence, synergy cases, integration plans, the expensive learning curve. M&A is treated, rightly, as critical and consequential to many organisation growth strategies.
But many leaders I meet are living through a different kind of merger, namely the internal one. Two teams combined “to simplify” ways of working. Departments collapsed into a single function. Countries clustered into a regional hub. A centre of excellence created. Shared services expanded. An operating model “harmonised”.
These moves are common, operationally sensible, and often strategically necessary. And yet the effort required to ensure success is regularly underestimated because they don’t look like mergers. They look like and are often treated as rearrangements. And this creates a challenge because internally people don’t experience these changes as a tidy organisational design exercise. They experience them as a disruption to identity, status, belonging, and control, often while being asked to keep delivering as if nothing material has happened.
William Bridges’ distinction still holds: change is situational (the new structure). Transition is psychological (the internal reorientation people go through).[1]
Internal mergers fail in a very particular way: the change gets executed, but the transition never properly completes. The organisation “moves”, but people don’t always arrive.
Merger syndrome isn’t only an M&A problem
There’s a term in the M&A literature that captures what follows when the human side is mishandled: merger syndrome. That is the stress, uncertainty, distraction, and defensive behaviour that can take hold when people don’t yet understand where they stand, what’s expected, and whether they still belong[2].
Marks and Mirvis make the observation that they’ve seen these dynamics in both external and internal mergers. They argue that “attention to the human side must extend well beyond the moment executives declare the deal done”. Internal mergers often get less attention precisely because they’re internal. That doesn’t make the psychological impact smaller. It often makes it harder to name. You’re still in the same company, so what are you grieving?
The real loss is usually not the change in logo, work location, or as was in my case the background colour of my new security badge. It’s the erosion of a familiar world; ways of working, informal influence, local autonomy, the pride of a distinct identity, the comfort of knowing how decisions actually get made.
When hubs are created, the centre-periphery pattern can amplify this. The hub experiences “building capability”. The countries folded into it can experience “being absorbed”. Both can be true simultaneously.
The transition has three phases.
Bridges famously frames transition as three phases. An ending, a neutral zone, and a new beginning. On paper, these look like a model. In lived organisational life, they feel like a psychological journey most leaders try to rush through. The feeling here is understandable with ambiguity that is uncomfortable, and endings are politically messy. But if you skip them, you don’t get a clean start. You get a prolonged, low-grade drag.
What follows below is not a “framework”. It’s simply what I’ve seen to be true when internal mergers actually embed.
Phase one: establish an ending (even if the story is “this is a win”)
Internal mergers are often communicated as pure progress based on efficiency, scale, consistency, clarity. The problem that leaders talk primarily about benefits and avoid naming what is being left behind. Endings are not an emotional indulgence. They are a leadership obligation, because they clarify what is no longer true. If you don’t name the ending, people will do it for you, and they will do it through rumour, resistance, and private exit plans. When people lack credible information, they rely on informal channels, and those channels tend to amplify anxiety rather than reduce it.
A practical way to lead the ending is to be painfully specific. For example not simply say that “we’re integrating”. Rather share which decisions will no longer be made locally; what will stop; what will be standardised; what authority is moving; what practices are being retired; what the hub will own that a country used to own.
This is where many leaders flinch, because it forces you to acknowledge loss. But loss is already present. The question is whether it’s respected or denied. Ammalo partner Andrew Day has written about this specific topic in his book[3]. Disruptive and transformational change incurs losses at multiple levels and in different forms.
There’s another reason endings matter and that is group identity. Work on social identity highlights how strongly people derive meaning from group membership, and how easily an “us versus them” dynamic can emerge when group boundaries are disturbed. If you want a merged organisation rather than two camps sharing a budget line, you have to treat identity as part of the work, not a side-effect.
Phase two: the ambiguity isn’t a gap to eliminate. It’s a condition to manage.
After the org chart comes the neutral zone. This is where people more often than not experience role overlap, processes that are half-built, decision rights wobble, and people keep asking questions because the answers are still evolving.
This is where internal mergers often stall, because the organisation becomes impatient. It tries to force certainty into a phase that is, by definition, transitional or liminal.
In this space, two leadership reflexes show up reliably:
- Some leaders try over-control: more governance, more approval layers, premature standardisation, tight policing of “the new way”.
- Others step back and under-lead: “they’ll figure it out”, which usually means power fills the vacuum and the strongest voices define reality.
What works better is containment. Enough clarity that people don’t panic, enough flexibility and agency so that the new can be shaped. This is where sensemaking becomes central. Weick describes sensemaking as the ongoing process by which people construct plausible meaning in ambiguous situations[4]. In transitions, the organisation is constantly trying to answer: what is going on here, and what does it mean for me?
Leaders don’t need to provide a perfect story. They need to provide a credible one and keep updating it without pretending certainty where it doesn’t exist. Internal mergers require learning at speed, new interfaces, new norms, new trade-offs. If people don’t feel safe to speak, you get performance theatre. Agreement in meetings. Friction in execution.
Phase three: relaunch the new
Eventually things become clearer. People understand the interfaces. Work starts to flow. The hub begins to function. Leaders often declare success here. But stability is not the end of the transition. It’s merely the end of the acute disruption.
A real beginning happens when people stop behaving as if the new setup is provisional, when they invest in it emotionally as well as operationally. Bridges calls this the “new beginning”.
This is achieved when story, symbols, and systems align:
- The story becomes believable, not aspirational, people can explain what the merger is for in a way that matches their lived experience.
- The symbols match the intent, where leaders spend time, who gets listened to, whose work is celebrated, where investment flows. People learn the real organisation through symbols, not slides.
- The systems stop pulling people back into old loyalties, performance measures, decision rights, incentives, escalation paths. If those remain anchored in the old world, the old world will keep winning.
This is what a relaunch really is: not communications, but coherence.
A closing thought…
Internal mergers are easy to underestimate because they are common. And because they are common, leaders often try to make them feel ordinary and simple. But psychologically, they aren’t ordinary or simple at all. They’re a separation, an in-between, and a reattachment. And if you don’t lead those phases deliberately, you don’t get neutrality. You get merger syndrome, just quieter, slower, and more expensive.
The organisations that do this well don’t “manage resistance”. They respect transition. They mark the ending. They contain the ambiguity. And they relaunch the new in a way people can genuinely step into.
VIGNETTE – An example of our work
A European business merged several country organisations into four hubs to address margin pressure and shifting consumer behaviour. The design was created centrally with little local involvement and announced with a long lead time before go-live. Local leadership teams quickly realised the human reality: many functional roles would disappear to avoid duplication, and those expected to lead the change were also personally impacted by it.
In the transition phase, we worked with leaders and used the Change House and SCARF model to make the emotional terrain speakable. Specifically addressing what was ending, what felt threatened, and what support was needed. They then translated that into practical commitments: how they would lead while people occupied different “rooms” of change, and what their own team purpose was until go-live.
Post go-live, the pattern was predictable: some departures, some redeployments, and some leaders staying to build the new. The difference-maker was the launch discipline, naming what was being left behind, celebrating what had worked, and agreeing symbols and ways of working that anchored the new hub culture.
