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M&A Integration: The First 100 Days

A practical guide to integrating acquisitions in software companies. Based on lessons from multiple portfolio company acquisitions.

GASJ Team11 min read

Why Integration Matters

Studies consistently show that 50-70% of acquisitions fail to deliver expected value. The failure mode isn't usually bad deal logic—it's poor integration. We've supported numerous acquisitions across the GASJ portfolio and have developed a playbook that works.

Before Close: The Foundation

Integration planning starts before the deal closes. Key pre-close activities:

Integration Lead: Assign a dedicated person to own integration. This is not a part-time job. For acquisitions over $50M, consider hiring externally.

Day 1 Checklist: Legal, HR, IT, Finance—each function needs a day 1 plan. Access provisioning, communication, reporting line clarity.

Retention Plan: Identify critical employees. Have retention packages ready for day 1. Losing key people in the first 90 days is often fatal.

Customer Communication: Draft messages for customers of both companies. Proactive communication prevents speculation.

Days 1-30: Stabilize

The first month is about stability, not optimization. Objectives:

Preserve momentum: Don't disrupt existing commitments. Deals in pipeline, features in development, customer promises—honor them all.

Establish communication: Weekly all-hands, daily leadership syncs, clear escalation paths. Overcommunicate everything.

Quick wins: Find 2-3 visible improvements you can make immediately. New equipment, better coffee, faster expense reimbursement. Signal positive change.

Assess reality: Your diligence was based on limited information. Now you have full access. Verify assumptions about technology, team, customers.

Days 31-60: Understand

The second month is about deep understanding before making changes.

Technical Assessment: Map systems, dependencies, technical debt. Understand before restructuring.

Team Mapping: Individual meetings with every employee. Understand skills, aspirations, concerns. Identify flight risks and hidden talent.

Customer Listening: Talk to 10-15 customers. Understand their relationship with the acquired company. What do they value? What concerns them about the acquisition?

Cultural Differences: Every company has its own culture. Document differences without judgment. Successful integration respects both cultures.

Days 61-100: Integrate

With understanding established, begin careful integration.

Systems Integration: Pick a path: migrate acquired systems to parent, vice versa, or build new shared systems. There's no universal answer, but indecision is costly.

Organizational Clarity: Finalize reporting structures. It's better to be clear than perfect. Ambiguity erodes trust.

Go-to-Market Alignment: How will sales teams work together? Will products be sold separately, bundled, or merged? Make decisions and communicate them.

Cultural Integration: Start shared rituals. Combined all-hands, cross-team projects, shared celebrations. Culture is built through shared experience.

Common Mistakes

Moving too fast: Eager acquirers often destroy value by forcing rapid integration. Give the acquisition time to prove its thesis before restructuring.

Moving too slow: Prolonged ambiguity is equally damaging. Make decisions. You can course-correct later.

Ignoring cultural fit: Technical integration without cultural integration creates silos and resentment.

Focusing only on synergies: Cost synergies are visible. Revenue synergies are harder. The best acquisitions create new opportunities neither company could access alone.

Neglecting your own company: Integration absorbs leadership attention. Don't let your core business suffer.

Resources We Provide

For portfolio companies doing acquisitions, GASJ provides:

  • Integration playbook and templates
  • Access to integration consultants we've worked with
  • Financial modeling for synergy capture
  • Board-level support for difficult decisions
  • Acquisitions are one of the highest-risk, highest-reward activities in business. With proper integration, they can transform a company. Without it, they can destroy value. We're here to help get it right.

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