Pre-M&A Reality Check – Part 2 The Deal Model Assumed They’d Stay. They Didn’t.
- Helena Ferrari
- Mar 26
- 3 min read
I spent the early part of my career watching M & A deals succeed on paper and unravel in practice.
The numbers cleared. The diligence was complete. The valuation held. And then the people left.
What I understood then, and what I’ve built my practice around since, is that the financial model is only as sound as the human assumptions underneath it. And in most transactions, those assumptions are never tested.
It doesn’t matter whether it’s a PE-backed platform acquisition, a strategic bolt-on, or a full merger. The sequence is consistent:
Within 6–12 months of close:
• Key leaders are gone.
• Execution slows.
• Customers hesitate.
• Synergies slip.
The KEY question from the board is always the same: “HOW DID WE MISS THIS?”
The deal model assumed continuity of talent. No one stress-tested it.
The People You Can Least Afford to Lose Are the First to Go
Uncertainty creates movement. 8 -12% of your workforce carrying institutional knowledge, client trust, technical depth, and the informal influence that holds execution together, they have options. And they start evaluating them the moment a deal is announced.
When they leave, it isn’t an event. It’s erosion. Slow, quiet, and compounding.
McKinsey research makes the case that talent flight can undermine performance, value creation, and both the near- and long-term success of a deal, and that organizations should develop talent retention plans as soon as possible, often before the acquisition is finalized.
HR at the Strategy Table Requires a Different Language
For most of my career, Human Capital, what many organizations still call HR, was handed the org chart after the ink was dry. We executed onboarding, drafted retention agreements, and managed communications. We were downstream of the decision.
What changed wasn’t a new title or an expanded mandate. It was a shift in language.
When I stopped presenting people issues as culture and engagement concerns, and started translating them into flight-risk exposure, cost-per-departure, and the timeline of retention leverage, the conversation changed entirely.
The Governance Gap That Still Costs Deals
In most transactions, HR is still activated at the wrong moment.
Process onboarding. Execute communications. Draft agreements. Necessary work, but entirely downstream of where real exposure lives.
What rarely happens pre-close: a structured assessment of which leaders carry disproportionate organizational risk, where knowledge is dangerously concentrated, and what the retention window actually looks like before uncertainty peaks.
That is not a resource constraint. It is a governance gap.
And it is still costing acquirers value they will never recover.
Best Practice: Engineer Talent Continuity Before Close
Disciplined deal governance includes structured pre-transaction people risk assessment, focused on:
• Critical role dependency mapping
• Knowledge concentration risk
• Flight-risk heat analysis
• Leadership adaptability under disruption
• Retention strategy designed before uncertainty peaks
Not reactive stay bonuses after panic sets in.
EXECUTIVE GUT CHECK
If three of your highest-impact leaders resigned within 90 days of close, what breaks first?
The vulnerabilities of this framework surfaces are not unique to transactions. They exist in every organization, right now. Knowledge concentrated in a handful of people. Leaders whose departure would stall execution. Retention windows closing before anyone notices. These are operational and governance risks, and most companies don’t see them until they’re already absorbing the cost.
Check out Part 1 of the series - https://www.thehrrx.com/post/pre-m-a-reality-check-why-deals-miss-the-people-risks-that-matter-most
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