Mercer is becoming Marsh.

Learn more
Learn more
People in M&A M&A advisory

The M&A Disconnect. Your Deal Thesis Isn't the Problem 

    80% of M&A deals fail to deliver intended value. But not for the reasons you think. The deal doesn't fail because the strategy was flawed. It fails because the people part was never aligned.

    91% of acquirers recognize human capital as a key driver of value. But only 41% integrate it into their deal targeting or thesis.

    Our research "From Deal Thesis to Post-Close Performance" reveals the human capital factors your current due diligence is missing.

    The M&A Reality Check: What's claimed vs. what's executed

    This isn't a knowledge gap. Leaders know human capital matters. What's missing is preemptive action. Integration planning still prioritizes systems and processes over the human dynamics that determine whether those systems will ever function effectively.

    When Human Capital is an Afterthought

    • Leadership retention deferred until operational pressure
    • Culture misalignment emerges post-close
    • Talent attrition accelerates after announcement
    • Synergies delayed or lost entirely
    • Value leakage from day 1 onward

    When Human Capital is Aligned to Deal Thesis

    • Leadership aligned before close
    • Culture integrated with precision
    • Strategic talent retained and motivated
    • Synergies captured on schedule
    • Value accelerates post-close

    The Hard Truth About M&A

    50%

    of M&A value lost due to ineffective integration planning, not flawed deal logic.

    30%

    lower integration costs when companies invest in structured Day 0 planning with human capital at the center.

    25%

    higher retention rates post-close when total rewards are strategically aligned to deal objectives.

    Deals don't live or die on spreadsheets. They live or die on people. You can buy the assets, but you'd better keep the people who make them worth anything.
    Partner

    Human Capital Consulting

    The Seven Levers of Human Capital Alignment

    • 1. Organization Design

      The blueprint for post-merger success. Flawed design kills synergies. Strong design drives velocity.

    • 2. Talent Diligence

      Identify who actually makes the business work—often invisible on org charts. Protect critical talent.

    • 3. Leadership Alignment

      Poor alignment drives disengagement. Strong leaders execute integration and capture value.

    • 4. Culture Integration

      Culture shapes decision velocity and collaboration. Misaligned cultures fail quietly through attrition.

    • 5. Total Rewards

      Strategic incentives protect value. Misaligned rewards accelerate attrition and erode stakeholder returns.

    • 6. Change Management

      Unmanaged uncertainty breeds resistance. Intentional change drives alignment and accelerates synergies.

    • 7. HR Operating Model

      HR determines if deals deliver. Strategic HR enables clarity, confidence, and continuity from day 1.

    When It Works

    $35B Semiconductor Deal

    A leading multinational acquired a programmable chip company.

    • 5,000+ employees

    • $80B to $135B addressable market

    Here's what they did differently.

    Leadership recognized early that cultural alignment would determine execution velocity. Instead of assuming culture would "just work," they:
    • Pre-close Culture Survey
      Identified shared strengths: product excellence, customer focus, innovation, execution, collaboration.
    • Unified Culture Statement
      Built a shared vision cascaded globally post-close to give employees direction and purpose.
    • Dedicated Workstreams

      Talent retention and culture integration led by HR, engaging leaders from both organizations proactively.

      The focus wasn't on managing culture after day 1. It was on aligning it before close.

    • $1B+ Annual synergies captured

    This wasn't luck. Human capital was architected into the deal strategy, not patched together after.
    1. Revenue nearly tripled to $10B+
    2. Talent retained
    3. Culture protected
    4. Structure enabled velocity

    From deal thesis to post-close performance: The impact of human capital platform alignment

    80% of M&A deals fail—not because strategy was flawed, but because human capital was ignored. Learn how to align people strategy with deal thesis for real value.
    Download this report
        Related solutions
        Related insights

        Day 1 Isn't the Finish Line

        Nearly half of anticipated M&A value is lost in integration. See the critical factors that separate successful deals from failures. Download our report.
        As part of our ongoing brand evolution, you may begin to see updates to our branding, including our name, logos, and other visual identity elements, across our websites, communications, and other materials. Since these changes are being implemented on a phased basis, both current and updated branding may appear concurrently during the transition period. Information regarding legal entity name changes and other related legal notices for certain licensed US and Canadian legal entities will be available at https://www.marsh.com/en/about/legal-entity-us-ca.html and updated as changes become effective. Unless expressly stated otherwise, these branding updates do not change the legal entity providing products or services, modify existing contractual relationships, or alter any applicable rights, obligations, or regulatory responsibilities.