M&a value slips: diligence gaps, carve-out tactics eyed

Value leakage in M&A deals frequently stems from critical gaps between deal phases, particularly due to inadequate due diligence and poor continuity post-signing. A Bain survey revealed that nearly 60% of executives attribute disappointing outcomes to due diligence that fails to uncover key risks, often because the scope is narrowly confined to financial and legal aspects while overlooking commercial and operational threats like customer concentration and technical debt. Moreover, these diligence findings tend to be shelved after signing, rather than integrated into the ongoing integration plan, undermining accountability and allowing hidden risks to fester during the crucial post-close period.

Overoptimistic synergy projections represent another major source of value erosion, with Bain’s analysis showing that 70% of merging companies inflate synergy estimates beyond what scale benefits justify. This disconnect often arises from a lack of traceability and clear ownership of synergy assumptions, which can mislead stakeholders and set unrealistic expectations. Addressing this requires disciplined integration planning starting well before Day One, including decisive leadership appointments, establishment of a single accountable integration leader, and locking down essential Day One activities to prevent costly delays and misalignment.

Post-close integration execution is a critical battleground for preserving deal value, as evidenced by Revelio Labs’ finding that about 18% of acquired company employees, including nearly 20% of senior managers, leave within 18 months, draining institutional knowledge and customer relationships vital for synergy realization. To combat this attrition and convert synergy plans into tangible outcomes, companies must implement structured post-merger integration checklists that sequence and assign ownership to key actions—such as retention offers, proactive customer outreach, and systems alignment—within the first 100 days, thereby transforming good intentions into measurable value capture.

Carve-out execution demands a strategic shift from traditional M&A approaches, emphasizing early value creation embedded within ongoing portfolio analysis well before the divestment decision. As highlighted in the 2026 case study 'Winning the carve-out relay,' success hinges on investing significant time upfront to assemble and train a specialized team, define a clear race plan, and build organizational capabilities rather than hastily diving into financials. This proactive preparation ensures the squad is fit and ready to navigate the unique challenges of carve-outs, setting the stage for value preservation and growth.

Unlike standard M&A deals, carve-outs require mastering specialized execution muscles and making strategic choices among spin-offs, sales, or listings, each demanding distinct toolsets and tactics. The 2026 case study underscores that carve-outs are not 'Business As Usual' but a complex relay race where the handoffs and race tactics must be learned and rehearsed in advance. This specialized approach enables teams to handle the intricate unwinding of shared systems, personnel, and contracts—complexities that go far beyond simply selling an independent subsidiary and are critical to maximizing transaction value.

Stephen Gillespie underscores that managing technology and intellectual property risks in spinoffs and carve-outs demands a cross-functional team equipped to meticulously identify all shared technology and software IP, a strategy critical to avoiding protracted and costly divestiture negotiations. As the market for carve-outs continues to intensify, Gillespie anticipates that the complexity of these transactions will only increase, making such expert collaboration indispensable for companies aiming to safeguard value and streamline separation processes.

A central challenge in these transactions lies in the division of rights to data and software intellectual property between parent companies and their spun-off subsidiaries, which often leads to significant knowledge and scale gaps. Gillespie highlights that these pitfalls can undermine operational continuity and value realization, emphasizing the necessity for precise delineation of IP rights to prevent fragmentation and ensure both entities retain the capabilities needed to thrive post-separation.

Integrated execution that weaves value initiatives directly into separation workstreams is paramount for preserving deal value in complex carve-outs. Leading sellers, as highlighted in the 2026 case study 'Winning the separation,' achieve this by creating a unified view of activities, dependencies, and value outcomes, which enables a seamless transfer of technology and data. Early mastery of these technological complexities, coupled with proactive planning for transitional service agreement (TSA) exits from Day One, significantly reduces risk and accelerates the separation process, ultimately safeguarding the intended value.

Transforming separation from a routine task into a value-driven transformation hinges on uniting carve-out and value creation experts under a single leadership umbrella. This integrated leadership approach, involving a dedicated separation management office, ensures that value priorities are embedded in every separation decision. Moreover, sustained leadership engagement throughout planning and execution maintains a sharp focus on value, meeting the high expectations of stakeholders on both sides of the transaction—CarveCo and RemainCo alike—as underscored in the August 2026 analysis.