What should leaders align in the first 100 days after a merger?

Mergers are about the formation of something new, so naturally, a new but solid foundation needs to be established. But this is easier said than done when a combination of organisations, legacies, structures and people comes together. It’s a particularly challenging time for leaders as they tackle the huge task of creating the clarity, confidence and momentum needed to move the organisation forward. So what should leaders align in the first 100 days after a merger? What should their priorities be?

Belonging at the heart of the issue

Commercial and human success are intertwined. We know that building a sense of ownership leads to lower employee turnover, as people who feel like they belong after a merger are three times more likely to stay. But it’s a long game. In the early days, fewer than 45% of acquired employees feel like a part of the combined company, while after a year or so, this has risen to 80%. That’s why the first 100 days after a merger are critical, as the most successful leaders focus on a small number of high-impact people decisions early on. What are they and what do they mean for you? Here are 6 areas you can’t ignore.

1. Leadership alignment

Before the wider organisation can align, the senior team needs to. If this is not addressed early, employees will quickly notice the gap between what’s set down in writing and real-life leadership. And it’s not just about agreeing on strategy, it means being honest about:

• Priorities.
• Operating style.
• Decision-making.
• Tensions.
• Trade-offs.
• The behaviours leaders need to model.

2. Critical talent risk

Losing employees with essential skills impacts performance and competitiveness, which can be the difference between success and failure. But not all roles carry equal integration risk, so in the first 100 days, leaders should understand:

• The people they cannot do without.
• Where influence sits, formally and informally.
• Which individuals are most uncertain about their role.
• The factors impacting confidence and retention.

When it comes to a retention strategy, it needs to be about more than financial measures. It has to intentionally focus on encouraging effective communication and active listening, role clarity and building trust in leadership.

3. The integration narrative

Understanding of the new environment should extend beyond the story of what’s changed. It needs to include what the combined organisation is trying to become and what it wants to achieve, so it should clearly lay out:

• Why the merger happened.
• What the future organisation is aiming for.
• What will be different in real-life ways.
• And what this means for employees.

Without this vital information, employees fill the gap with speculation.

4. Values and behaviours

A newly merged organisation needs to set behavioural expectations early, even if the full framework isn’t in place yet (this often evolves, given time). It helps leaders to signal:

• How people are expected to work together.
• What collaboration should look like.
• What kind of leadership the new organisation values.
• What behaviours support the future success of everyone.

5. Core people process priorities

Not every people process needs to be aligned immediately, but leaders should prioritise a few areas that have the biggest impact on clarity and fairness, like:

• Leadership roles and accountabilities.
• Communication and manager guidance.
• Performance expectations.
• Onboarding for new joiners.
• Critical hiring decisions.
• Reward principles where consistency matters early on.

6. Communication rhythm

Employees don’t just need information; they need consistency. So this isn’t just what’s delivered, it’s about how it’s delivered. This means that whatever the channel, the same message comes through. Managers and leaders are in the best position to make sure this happens.

Alignment in action

Bringing two distinct organisations together is a journey of transformation. It requires patience, empathy, skill and deliberate focus. By prioritising leadership alignment, protecting critical talent, and communicating with absolute consistency, you protect your culture and set the stage for long-term growth. The first 100 days after a merger are challenging, but they offer a unique opportunity to build a lasting foundation of trust. Where is your leadership team focusing its energy right now? We would love to hear your thoughts.