When a large company acquires a startup, the natural tendency is to impose its standardized processes. Successful integration requires a balance: knowing which systems to standardize for leverage while allowing the acquired team to maintain its freewheeling, startup-style execution.

When integrating acquired biotechs, Merck prioritizes retaining key talent and preserving ongoing science. The strategy involves immediate face-to-face engagement to reduce anxiety, followed by a pragmatic assessment of which processes must be standardized versus which can remain to avoid disrupting critical trials, a practice they call avoiding 'mercification'.

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.

Palo Alto Networks' M&A playbook defies convention. Instead of integrating an acquisition under existing managers, they often replace their own internal team with the acquired leaders. The logic is that the acquired team won in the market with fewer resources, making them better equipped to lead that strategy forward.

The "conquering hero" approach of forcing an acquired company to adopt your processes is the cardinal sin of M&A. Omar Tawakol's experience at Oracle showed that protecting an acquisition's unique workflows and incentives leads to growth, while rapid, forced integration destroys value.

A one-size-fits-all integration can destroy the culture that made an acquisition valuable. When State Street acquired software firm CRD, it intentionally broke from its standard process, allowing CRD to keep its brand identity, facilities, and even email domain to preserve its creative culture and retain key talent.

Viewing acquisitions as "consolidations" rather than "roll-ups" shifts focus from simply aggregating EBITDA to strategically integrating culture and operations. This builds a cohesive company that drives incremental organic growth—the true source of value—rather than just relying on multiple arbitrage from increased scale.

Instead of only the buyer investigating the target, successful M&A involves "reverse due diligence," where the target is educated about the buyer's company. This transparency helps the target team understand how they will fit, fostering excitement and alignment for the post-close journey.

For certain acquisitions like Poker, IFS deliberately avoids full integration to retain the target's agile, entrepreneurial culture. Instead, they use product connectors and provide access to parent company resources, allowing the startup to maintain its dynamism while leveraging scale.