Leadership Due Diligence Cycles: The Structural Failure Loop in Private Equity CEO Assessment

A data-grounded analysis of why CEO turnover repeats and what breaks the cycle

Don L. Gaconnet, CSE III LifePillar Institute for Structural Identity Sciences · Lake Geneva, Wisconsin

Abstract

The leadership due diligence cycle is the structural failure loop that repeats when behavioral assessment is the sole instrument applied to CEO evaluation in private equity. This paper presents the evidentiary basis for the cycle's six-phase sequence — behavioral assessment, capital deployment, year-one mask, year-two exposure, CEO replacement, and re-entry — drawing on published data from Russell Reynolds Associates, AlixPartners, Heidrick & Struggles, Spencer Stuart, and Challenger, Gray & Christmas. CEO turnover reached an eight-year global high in 2025, with 234 departures across thirteen major indices. The proportion of CEOs departing within thirty to thirty-six months of appointment increased seventy-nine percent year over year. Sixty-five percent of PE firms replace the CEO during the holding period, and fifty-four percent of post-transaction CEO exits concentrate in the one-to-two-year window. The paper identifies behavioral assessment's structural reliance on self-report as the mechanism that perpetuates the cycle. It concludes that the cycle does not break through improved behavioral methodology. It breaks through the introduction of independent instrumented measurement at the assessment phase — a practice this author defines as cognitive due diligence.

1. CEO Turnover at Structural Threshold

The global data on CEO departure has crossed from elevated into structural. Russell Reynolds Associates' 2025 Global CEO Turnover Index recorded 234 CEO departures across the thirteen indices it tracks, a sixteen percent increase over 2024 and twenty-one percent above the eight-year average. This was the second consecutive record year. Challenger, Gray & Christmas, tracking a broader population of publicly traded US companies, recorded 446 CEO exits in 2025, the highest annual total since the firm began tracking this metric in 2002.

The departures are not merely more frequent. They are arriving earlier. Average outgoing CEO tenure fell to 7.1 years in 2025, down from 7.4 in 2024 and substantially below the 8.3-year average recorded in 2021. For the first half of 2025, average outgoing tenure dropped to 6.8 years, the lowest figure since Russell Reynolds began tracking. The compression is accelerating.

The most structurally significant datum in the Russell Reynolds index is this: the proportion of CEOs departing within thirty to thirty-six months of taking the role increased seventy-nine percent year over year. Nearly four in five of these early departures are concentrated in a window that maps precisely to the year-two failure pattern documented in PE-specific data. This is not a statistical coincidence. It is the leadership due diligence cycle expressing itself at the index level.

Eighty-six percent of new CEO appointments in 2025 were first-time CEOs — executives who had never held the top role at a public-listed company. The pipeline is at record volume, the incumbents are departing faster, and the replacements are entering with less experience in the specific role. Every variable that could amplify the cost of an assessment failure is at peak simultaneously.

2. The Six-Phase Sequence

The leadership due diligence cycle is a six-phase structural loop. Each phase is documented in the published data. What follows is the evidentiary basis for each.

Phase 1 — Behavioral assessment

The CEO is evaluated prior to appointment through behavioral interviews, psychometric testing, personality assessments, 360-degree feedback, and reference checks. Spencer Stuart — one of the industry's leading providers — has published the structural limitation directly, noting that the problem with traditional assessment approaches is that they evaluate leaders on existing skills and experiences rather than on the capacity to stretch beyond those into the demands of a new role. This is not a criticism from outside the paradigm. It is a self-diagnosis from inside it. The assessment reads what the executive has done. It does not measure what the executive can structurally carry.

Phase 2 — Capital deployment

Capital deploys through the deal thesis on the basis of the behavioral assessment, the financial due diligence, the operational review, and the legal analysis. Over $1 trillion in US dry powder sits under deployment pressure. Entry multiples are at 11.8x EBITDA. The AlixPartners 11th Annual PE Leadership Survey, fielded to 427 respondents across PE firms and portfolio companies, confirms that seventy percent of portfolio company CEOs are hired within the first year of acquisition. The CEO at the helm of the deal thesis was assessed behaviorally, appointed, and given the capital. Nothing in the assessment measured whether they could structurally carry the load the thesis requires.

Phase 3 — Year-one mask

The performance layer holds. This is not a theoretical construct. It is an observable and documented phase in which the behavioral assessment appears validated, metrics track to plan, and the CEO presents the version of themselves aligned with the deal thesis. Ted Bililies, Partner and Managing Director at AlixPartners, characterized the dynamic precisely: the CEO who was hired to execute the plan the sponsor underwrote is performing. The performance layer does not collapse under short-term observation. It requires sustained structural load to degrade.

The first year is survivable on performance capacity alone. The behavioral interview captured the executive's description of their own capability. The organization confirms the description. The reference checks confirm the description. The entire assessment architecture is self-consistent — and self-referential. It reads one signal: the executive's self-presentation. Year one does not test whether that signal is structurally reliable. Year two does.

Phase 4 — Year-two exposure

AlixPartners and Russell Reynolds Associates, in a joint October 2025 analysis, documented that seventy-five percent of CEOs exit after a change in control, and fifty-four percent of those exits concentrate in the one-to-two-year window following the transaction. Sixty-five percent of PE firms report CEO turnover during the holding period. Year two is the structural inflection.

The pattern is not random. It is the structural consequence of load exceeding capacity under sustained conditions that the performance layer can no longer conceal. Decisions begin to narrow. Execution velocity degrades. The deal thesis stalls — not because the strategy was wrong but because the person executing it has reached a structural limit the behavioral assessment did not detect.

Mark Gillett, Managing Director and Head of Value Creation at Silver Lake Partners, stated the structural position directly in the AlixPartners 11th Annual Survey context: executives frequently believe they are executing well, but the reality does not match the plan the sponsor underwrote. The misalignment is not motivational. It is structural. The executive cannot see what they cannot report.

Phase 5 — CEO replacement

Eighty-six percent of CEO turnover in PE portfolio companies is initiated by the PE firm, not by the CEO. Eighty-three percent of PE executives say unplanned CEO turnover lengthens the holding period. Forty-six percent say it erodes returns. The firm loses the failed tenure and the replacement ramp. The deal thesis is repriced. The operating partner's bandwidth shifts from value creation to transition management at the point in the holding period where acceleration should be occurring.

The cost is not merely disruptive. It is cumulative. Each cycle iteration consumes capital, time, and organizational coherence that the deal thesis cannot recover.

Phase 6 — Re-entry

A replacement CEO is sourced through executive search in private equity. The replacement undergoes the same behavioral assessment methodology — the same interviews, the same psychometric tests, the same 360-degree feedback, the same reference checks — that failed to detect the structural condition in the predecessor. The cycle restarts at Phase 1.

The measurement has not changed. The instrument reads the same signal. The error will propagate.

3. The Measurement Failure

The leadership due diligence cycle does not repeat because PE firms hire poorly. It does not repeat because operating partners lack judgment. It does not repeat because the behavioral assessment firms lack rigor. It repeats because behavioral assessment reads a signal — self-presentation — that is structurally unreliable in the measurement domain where it is being applied.

Published research in structural identity sciences has documented an 81.4 percent domain mismatch between what individuals report about their own structural state and what independent instrumented measurement reveals. The executive is not lying. The self-report mechanism is structurally insufficient in the domain of structural capacity, structural load, and the relationship between them. When the measurement domain is structural, and the instrument reads self-report, the instrument's error rate is above eighty percent.

Every tool in the behavioral assessment framework inherits this error. The behavioral interview asks the executive to describe their own capability. The psychometric test asks the executive to rate their own traits. The 360-degree feedback asks the executive's network to describe the performance they observe. The reference check asks contacts the executive selected to characterize their track record. Each instrument reads the performance layer — what the executive shows. None reaches the structural state beneath it.

Heidrick & Struggles' 2026 Route to the Top report quantified the downstream consequence: more than a third of US companies still do not have a CEO with the capabilities the company needs to succeed in the near term. The industry's own data demonstrates that the behavioral assessment pipeline is producing CEOs who do not have the structural capacity for the roles they occupy. The cycle repeats because the measurement that should detect this condition at Phase 1 reads the wrong signal.

4. The Perception Gap

The structural data most directly revealing the cycle's mechanism is the AlixPartners perception gap. Forty-one percent of PE executives rate their portfolio company senior leadership quality as high. Thirteen percent of portfolio company leaders agree.

A twenty-eight-point gap between how the investor reads the executive and how the organization experiences the executive. This gap is not a communication failure. It is a measurement artifact. The PE firm's assessment of leadership quality is derived from the same behavioral signals the assessment instruments produce — self-presentation, track record, interview performance, reference endorsement. The portfolio company's assessment is derived from the daily structural reality of working under that leadership.

The behavioral assessment reads the first signal. It does not read the second. The perception gap is the structural distance between what the assessment measured and what the operating reality produces. Twenty-eight points. Sustained across a decade of AlixPartners surveys. The gap does not close because the measurement has not changed.

5. What Breaks the Cycle

The leadership due diligence cycle breaks at Phase 1. It breaks when the assessment at entry reads a different signal — one that is structurally independent of the executive's self-presentation.

Cognitive due diligence introduces independent instrumented measurement at the point in the cycle where behavioral assessment currently operates. The assessment bypasses self-report entirely, measuring structural capacity, structural load, and the trajectory between them through four biometric channels — EEG, heart-rate variability, facial affect, and voice prosody — that the executive cannot consciously modulate. A 70,000-line diagnostic engine integrates the four channels into an engineering report that goes in the deal file.

The structural condition that would surface at year two — the condition the behavioral assessment did not detect — is visible before capital deploys. The cycle does not initiate because the measurement at Phase 1 reads the structural reality, not the performance layer. The structural alternative to behavioral assessment is not a better interview. It is a different instrument reading a different signal.

This is the practice this author defines as cognitive due diligence — the fifth pillar of the due diligence framework, positioned alongside financial, operational, legal, and commercial due diligence as independent, instrument-based measurement of the person the capital depends on.

6. Scope and Implications

The leadership due diligence cycle model describes the structural failure loop specific to contexts where behavioral assessment is the sole instrument applied to executive evaluation and where sustained structural load is a condition of the role. It does not claim that all CEO turnover follows this pattern. Turnover driven by strategic disagreement, retirement, health, or voluntary departure is outside the model's scope.

The model does claim that where three conditions converge — behavioral assessment at entry, sustained structural load exceeding capacity, and the absence of independent instrumented measurement — the six-phase sequence is structurally inevitable. The published data from Russell Reynolds, AlixPartners, Heidrick & Struggles, and Spencer Stuart documents each phase independently. This paper identifies the structural mechanism that connects them into a self-perpetuating loop.

The implication is actionable. The cycle is not resolved by improving behavioral methodology. It is not resolved by adding more interviews, better psychometric instruments, or deeper reference architectures. The measurement domain is structural. The instrument must read structural signal. Until independent instrumented measurement is introduced at Phase 1, the cycle will continue to produce the data the industry continues to publish.

Data Sources

Russell Reynolds Associates. Global CEO Turnover Index Annual Report 2025. Published January 2026.

Russell Reynolds Associates. Global CEO Turnover Index Q1 2026 Update. Published April 2026.

AlixPartners. 10th Annual Private Equity Leadership Survey. Published March 2025.

AlixPartners. 11th Annual Private Equity Leadership Survey. Published March 2026.

AlixPartners and Russell Reynolds Associates. CEO Turnover in PE Portfolio Companies. Published October 2025.

Heidrick & Struggles. Route to the Top US 2026: Closing the CEO Capability Gap. Published May 2026.

Heidrick & Struggles. 2026 CEO & Board Confidence Monitor. Published February 2026.

Spencer Stuart. 2024 CEO Transitions: The Measure of the Market. Published March 2025.

Spencer Stuart. How to Get the Most From Executive Assessments. Published October 2025.

Challenger, Gray & Christmas. 2025 Annual CEO Turnover Report. Published January 2026.

Gaconnet, D. L. (2026). The leadership cycle: A structural model of the CEO assessment failure loop in private equity. Lake Geneva, WI: LifePillar Institute for Structural Identity Sciences.

Related: The Leadership Cycle · Leadership Due Diligence — The Structural Identity Assessment

Don L. Gaconnet, CSE III LifePillar Institute for Structural Identity Sciences Lake Geneva, Wisconsin SSRN 7657314 · ORCID 0009-0001-6174-8384 · OSF Verified

© Don L. Gaconnet, June 2026. All rights reserved.