Don't just hand an integration plan to functional leaders post-close. Involve them early in the process as co-architects. Their input is crucial for validating financial models and strategic assumptions, ensuring realistic expectations and fostering ownership of the deal's success.

Weber Blackstone's CEO noted "hurt feelings" on the Blackstone (acquirer) side. Success bred complacency, with some staff assuming they knew best. He had to actively combat the attitude that "Weber's been old and slow," which could undermine the integration.

Combining strategy, M&A, and integration under a single leader provides a full lifecycle, enterprise-wide view. This structure breaks down silos and creates a "closed-loop system" where post-deal integration performance and lessons learned directly feed back into future strategy and deal theses, refining success metrics beyond financials.

Many M&A teams focus solely on closing the deal, a critical execution task. The best acquirers succeed by designing a parallel process where integration planning and value creation strategies are developed simultaneously with due diligence, ensuring post-close success.

After learning from early deals, Booz Allen centralized post-merger integration accountability. Instead of fragmented ownership across the business, one specific market leader is now responsible for driving synergies and the overall success of the acquired company.

Deals fail post-close when teams confuse systems integration (IT, HR processes) with value creation (hitting business case targets). The integration plan must be explicitly driven by the value creation thesis—like hiring 10 reps to drive cross-sell—not a generic checklist.

A true integration leader must deeply understand the acquirer's operations, connect strategic deal value to tactical decisions, and act as a translator between siloed workstreams. This requires intense curiosity and hands-on involvement beyond the scope of traditional project management.

For iCapital, an acquisition is not complete until both the technology and the people are fully integrated into a "one-eye capital" culture. The CEO emphasizes that people integration is even more critical than tech integration, as a failure on the cultural front means the entire acquisition fails.

A detailed, rigid integration plan is fragile. A better approach is to create an "integration thesis" that sets clear "goalposts" and timelines for making key decisions. This allows for flexibility and data-informed choices (e.g., using A/B tests post-close) rather than locking into pre-deal assumptions.