# Post Merger Integration

> Post-merger integration (PMI) planning and execution. USE THIS SKILL when the user asks about integration planning, Day 1 readiness, 100-day plan, synergy tracking, synergy realization, integration management office, IMO, cultural integration, merger integration workstreams, integration risk, communication plan for an acquisition, post-close integration, or how to capture deal synergies. Also trigger when asked about employee retention post-acquisition, customer communication after a merger, or IT systems integration.

- Skill: `kaakati/post-merger-integration` (Agent Skill)
- Install (CLI): `npx skillmds@latest add kaakati/post-merger-integration`
- Raw SKILL.md: https://api.skillmd.com/api/skills/kaakati/post-merger-integration/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Integrations & APIs
- Author: Kaakati (https://skillmd.com/u/kaakati)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/kaakati/post-merger-integration

---


# Post-Merger Integration (PMI) Planning

## Required Inputs

- **Transaction Context**: Buyer, target, deal rationale, and announced synergy targets.
- **Deal Thesis and Synergy Assumptions**: Revenue synergies, cost synergies, and one-time integration costs from the deal model.
- **Timeline**: Expected close date, Day 1 target, and 100-day plan deadline.
- **Organization Scale**: Combined headcount, number of locations, and geographic spread.
- **Integration Philosophy**: Full integration, partial integration (keep brand/operations separate), or holding company model.

## Execution Steps

### 1. Integration Management Office (IMO) Design

The IMO is the command center for all integration activity. Establish before Day 1.

#### IMO Structure

| Role | Responsibility | Reporting To |
|---|---|---|
| **Integration Leader** (dedicated, senior) | Overall integration delivery; single point of accountability | CEO or Deal Sponsor |
| **Workstream Leads** (6-8 functional leads) | Own functional integration plan and milestones | Integration Leader |
| **PMO / Tracker** | Consolidated tracking, risk escalation, status reporting | Integration Leader |
| **Synergy Office** | Validate, track, and report synergy capture | CFO + Integration Leader |
| **Change & Communications Lead** | Employee, customer, and supplier communications | Integration Leader + CHRO |
| **Clean Room Manager** (pre-close only) | Manage information exchange within antitrust constraints | Legal + Integration Leader |

#### Governance Cadence

| Meeting | Frequency | Attendees | Purpose |
|---|---|---|---|
| Integration Steering Committee | Biweekly | CEO, CFO, Deal Sponsor, Integration Leader | Strategic decisions, issue escalation, synergy review |
| Workstream Leads Sync | Weekly | All workstream leads + PMO | Progress, dependencies, risks |
| Synergy Review | Monthly | CFO, Synergy Office, Workstream Leads | Validate pipeline, actuals vs. plan |
| Town Hall (all employees) | Monthly (first 6 months) | Leadership + all staff | Culture, progress, Q&A |

### 2. Day 1 Readiness Checklist

Day 1 is the first business day after legal close. The following must be ready:

| Category | Day 1 Requirement | Owner | Status |
|---|---|---|---|
| **Legal** | Entity restructuring complete; signing/closing docs executed | Legal | |
| **HR** | All employees have valid employment (offer letters or TUPE transfer); payroll set up | HR | |
| **HR** | Benefits continuity confirmed (no gap in health/retirement) | HR | |
| **HR** | Retention packages executed for identified key talent | HR | |
| **IT** | Email and basic systems access for all employees | IT | |
| **IT** | Day 1 org chart reflected in directory/systems | IT | |
| **Finance** | Bank accounts, signing authorities, and cash management ready | Finance | |
| **Finance** | Consolidated reporting chart of accounts mapped | Finance | |
| **Operations** | Supply chain and procurement authority clear | Ops | |
| **Operations** | Customer-facing operations uninterrupted | Ops | |
| **Sales** | Customer notification sent (per communication plan) | Sales | |
| **Sales** | Account ownership and territory assignments confirmed | Sales | |
| **Comms** | Internal announcement (CEO message to all employees) | Comms | |
| **Comms** | External press release, customer FAQ, supplier FAQ published | Comms | |
| **Compliance** | Regulatory filings complete; licenses transferred or reissued | Legal | |
| **Branding** | Interim branding guidelines issued (signage, email signatures, collateral) | Marketing | |

Every item must have a named owner and a binary ready/not-ready status. Anything not-ready on Day 1 needs an immediate workaround and a fix date.

### 3. 100-Day Plan

The first 100 days set the trajectory. Organize into three phases:

#### Phase 1: Stabilize (Days 1-30)

| Priority | Actions | Success Metric |
|---|---|---|
| Retain key talent | Execute retention agreements; 1:1 meetings with top 50 employees | 0 unplanned departures in top talent |
| Protect revenue | Contact top 20 customers personally; assign relationship owners | No revenue attrition from top accounts |
| Establish governance | IMO fully operational; workstream plans finalized | All workstreams have approved 100-day plans |
| Quick wins | Identify and execute 3-5 visible early wins | Quick wins announced internally |
| Baseline synergies | Validate pre-deal synergy assumptions with actual data | Synergy pipeline validated to +/- 15% |

#### Phase 2: Integrate (Days 31-70)

| Priority | Actions | Success Metric |
|---|---|---|
| Organizational design | Finalize combined org structure below C-suite | All roles filled or posted; no ambiguity |
| Process harmonization | Align top 10 processes (order-to-cash, procure-to-pay, hire-to-retire) | Process owners assigned; harmonization plans drafted |
| Systems integration | Begin IT integration per roadmap; migrate critical systems | IT migration on track per plan |
| Synergy execution | Launch cost synergy initiatives (procurement, headcount, real estate) | First cost synergies booked |
| Culture | Launch cultural integration program; conduct pulse survey | Pulse survey baseline established |

#### Phase 3: Accelerate (Days 71-100)

| Priority | Actions | Success Metric |
|---|---|---|
| Revenue synergies | Launch cross-sell programs; integrate sales teams | Revenue synergy pipeline > $[X]M |
| Full operating rhythm | Transition from integration governance to BAU governance | Steering committee frequency reduced |
| Synergy tracking | Publish first formal synergy realization report | Report presented to Board |
| Lessons learned | Capture integration lessons; update playbook | Lessons document completed |
| External communication | Customer and market update on combined entity progress | NPS maintained or improved vs. baseline |

### 4. Synergy Tracking Framework

#### Synergy Classification and Probability Weighting

| Synergy Type | Category | Gross Amount ($M) | Probability (%) | Weighted Amount ($M) | Realization Timeline |
|---|---|---|---|---|---|
| **Cost Synergies** | | | | | |
| Headcount reduction (duplicate roles) | Workforce | | 80-90% | | Months 1-6 |
| Facility consolidation | Real estate | | 70-85% | | Months 6-18 |
| Procurement savings (volume leverage) | Procurement | | 60-80% | | Months 3-12 |
| IT systems rationalization | Technology | | 50-70% | | Months 12-24 |
| Shared services consolidation | G&A | | 60-75% | | Months 6-18 |
| **Revenue Synergies** | | | | | |
| Cross-sell to combined customer base | Cross-sell | | 30-50% | | Months 6-24 |
| New market access (geographic) | Market expansion | | 20-40% | | Months 12-36 |
| Combined product bundling | Product | | 25-45% | | Months 12-24 |
| Pricing optimization | Pricing | | 30-50% | | Months 6-18 |
| **Total synergies** | | | | | |
| **One-time integration costs** | | | 90-100% | | Months 1-24 |
| **Net synergies** | | | | | |

**Rule of thumb**: Cost synergies are 70-80% achievable; revenue synergies are 30-50% achievable. Apply probability weights rigorously.

#### Synergy Realization Dashboard

Track actuals vs. plan at 12, 24, and 36 months:

| Metric | Target (Deal Model) | Actual (12 Mo) | % Realized | Actual (24 Mo) | % Realized | Actual (36 Mo) | % Realized |
|---|---|---|---|---|---|---|---|
| Run-rate cost synergies ($M/yr) | | | | | | | |
| Cumulative cost synergies ($M) | | | | | | | |
| Run-rate revenue synergies ($M/yr) | | | | | | | |
| Cumulative revenue synergies ($M) | | | | | | | |
| One-time integration costs ($M) | | | | | | | |
| Net synergy value ($M) | | | | | | | |
| **% of deal premium recovered** | | | | | | | |

The critical metric is **% of deal value realized through synergies at 12/24/36 months**. Calculate as:

```
% Deal Value Realized = Cumulative Net Synergies / Total Premium Paid over Standalone Value
```

Target: 50% at 12 months, 80% at 24 months, 100%+ at 36 months.

### 5. Workstream Design

Each workstream produces its own integration plan. The following defines scope and key deliverables:

| Workstream | Scope | Key Deliverables | Critical Decisions |
|---|---|---|---|
| **Finance** | Accounting, FP&A, treasury, tax, audit | Combined chart of accounts; consolidated reporting; cash management | ERP migration or bridging; transfer pricing |
| **IT** | Infrastructure, applications, cybersecurity, data | Systems integration roadmap; Day 1 connectivity; data migration plan | Which systems survive; migration sequence |
| **HR** | Compensation, benefits, talent, org design | Combined org chart; compensation harmonization; retention plan | Redundancy approach; benefits alignment |
| **Operations** | Supply chain, manufacturing, logistics | Facility rationalization plan; supplier consolidation; quality alignment | Which facilities close; make vs. buy |
| **Sales** | Go-to-market, territories, pricing, CRM | Combined sales org; territory realignment; unified pricing | Channel conflicts; account ownership |
| **Legal** | Contracts, compliance, IP, regulatory | Contract novation schedule; compliance program alignment; IP portfolio | Regulatory remedies; entity simplification |

### 6. Cultural Integration Assessment

Culture clashes are the #1 reason integrations fail. Assess systematically:

#### Cultural Dimension Comparison

| Dimension | Acquirer Profile | Target Profile | Gap (1-5) | Risk Level | Mitigation |
|---|---|---|---|---|---|
| Decision-making | Centralized / Decentralized | Centralized / Decentralized | | | |
| Risk appetite | Conservative / Aggressive | Conservative / Aggressive | | | |
| Performance orientation | Individual / Team | Individual / Team | | | |
| Communication style | Formal / Informal | Formal / Informal | | | |
| Innovation approach | Process-driven / Entrepreneurial | Process-driven / Entrepreneurial | | | |
| Work-life balance | High-intensity / Balanced | High-intensity / Balanced | | | |
| Customer focus | Product-led / Customer-led | Product-led / Customer-led | | | |

**Scoring**: Gap of 1-2 = Low risk (minor adjustment). Gap of 3 = Medium risk (active management required). Gap of 4-5 = High risk (dedicated cultural change program).

If any dimension scores 4-5, launch a dedicated cultural integration workstream with executive sponsorship.

### 7. Integration Risk Register

| Risk ID | Risk | Likelihood (1-5) | Impact (1-5) | Score | Mitigation | Owner | Status |
|---|---|---|---|---|---|---|---|
| R01 | Key talent departure | | | | Retention packages, career path clarity | HR Lead | |
| R02 | Customer attrition | | | | Proactive outreach, SLA guarantees | Sales Lead | |
| R03 | IT systems failure during migration | | | | Rollback plan, parallel running | IT Lead | |
| R04 | Synergy shortfall vs. plan | | | | Conservative re-baselining, additional initiatives | Synergy Office | |
| R05 | Cultural clash / employee disengagement | | | | Pulse surveys, cultural ambassadors | Change Lead | |
| R06 | Regulatory post-close requirements not met | | | | Compliance workstream tracking | Legal Lead | |
| R07 | Supplier disruption | | | | Dual sourcing, early supplier communication | Ops Lead | |
| R08 | Brand/reputation damage | | | | Unified comms plan, social media monitoring | Comms Lead | |

Score = Likelihood x Impact. Risks scoring >15 require a mitigation plan reviewed by the Steering Committee.

### 8. Communication Plan

| Stakeholder | Pre-Announce | Signing | Day 1 | 30 Days | 100 Days | Ongoing |
|---|---|---|---|---|---|---|
| **Employees (acquirer)** | N/A | CEO email + town hall | Welcome message; combined org info | Pulse survey results | 100-day progress update | Monthly town halls |
| **Employees (target)** | Clean room only | CEO joint message | Detailed FAQ; manager toolkit; benefits summary | 1:1s with new managers | Role clarity confirmed | Monthly town halls |
| **Key talent** | N/A | Personal calls from leadership | Retention package conversations | Career path discussions | Development plan | Quarterly check-ins |
| **Customers (top 20)** | N/A | Personal calls from account team | Letter from CEO; dedicated contact; SLA reaffirmation | Quarterly business review | Combined capability presentation | Regular cadence |
| **Customers (all)** | N/A | Email + FAQ on website | Follow-up email; support contacts | Any changes communicated | Newsletter update | Normal cadence |
| **Suppliers** | N/A | Letter to key suppliers | Contact and payment info; no disruption message | Updated terms if needed | Consolidated vendor mgmt | Normal cadence |
| **Investors/Board** | Board approval | Press release; analyst call | Integration update | Monthly integration report | 100-day Board presentation | Quarterly updates |
| **Media** | N/A | Press release | N/A | Only if needed | N/A | As needed |
| **Regulators** | Pre-notification if required | Required filings | Compliance confirmation | Progress on conditions | N/A | As required |

**Principles**: Communicate early, communicate often, communicate consistently across all channels. Never let employees learn news from external sources.

## Output Template

```markdown
## Post-Merger Integration Plan: [Acquirer] + [Target]

**Date**: [Date] | **Expected Close**: [Date] | **Day 1 Target**: [Date]

### Integration Philosophy
[Full integration / Partial integration / Holding company — and rationale]

### Integration Management Office
| Role | Name | Background |
|---|---|---|
| Integration Leader | | |
| Workstream Leads | | |
| Synergy Office Lead | | |
| Communications Lead | | |

### Governance Cadence
[Meeting schedule per governance framework above]

### Day 1 Readiness
[Complete checklist with owner and status for every item]

### 100-Day Plan
#### Phase 1: Stabilize (Days 1-30)
[Priorities, actions, and success metrics]

#### Phase 2: Integrate (Days 31-70)
[Priorities, actions, and success metrics]

#### Phase 3: Accelerate (Days 71-100)
[Priorities, actions, and success metrics]

### Synergy Plan
#### Synergy Summary
| Type | Gross ($M) | Probability-Weighted ($M) | Timeline |
|---|---|---|---|
| Cost synergies | | | |
| Revenue synergies | | | |
| Integration costs | | | |
| **Net synergies** | | | |

#### Synergy Realization Targets
| Metric | 12 Months | 24 Months | 36 Months |
|---|---|---|---|
| Cumulative net synergies ($M) | | | |
| % of deal premium recovered | | | |

### Workstream Plans
[Summary table with scope, key deliverables, and critical decisions per workstream]

### Cultural Integration Assessment
[Dimension comparison table with gap scores and mitigations]

### Risk Register
[Top 10 risks with scores, mitigations, and owners]

### Communication Plan
[Stakeholder matrix with channel and timing for each audience]

### Key Milestones
| Milestone | Target Date | Owner | Status |
|---|---|---|---|
| Close | | | |
| Day 1 | | | |
| Org design finalized | | | |
| First synergy report | | | |
| 100-day review | | | |
| Full integration complete | | | |
```

## Quality Checks

- [ ] Integration Management Office defined with named roles and clear reporting lines.
- [ ] Day 1 readiness checklist is complete with every item assigned to a named owner and marked ready/not-ready.
- [ ] 100-day plan organized into three distinct phases (Stabilize, Integrate, Accelerate) with measurable success metrics per phase.
- [ ] Synergies classified by type (cost vs. revenue), probability-weighted (not using unweighted gross numbers), and assigned to a realization timeline.
- [ ] Synergy realization tracked as a percentage of deal premium at 12, 24, and 36 months.
- [ ] All six workstreams (Finance, IT, HR, Operations, Sales, Legal) have defined scope and deliverables.
- [ ] Cultural integration assessment performed with gap scoring across at least 5 dimensions.
- [ ] Risk register includes at least 8 integration-specific risks with likelihood, impact, score, and mitigation.
- [ ] Communication plan covers all stakeholder groups (employees, customers, suppliers, investors, regulators) with specific timing and channels.
- [ ] No stakeholder group learns about integration changes from external sources before internal communication.
- [ ] Quick wins identified for the first 30 days to build integration momentum.
- [ ] Governance cadence defined with specific meeting frequency, attendees, and purpose.