One definitive number.
Stabilisation Efficiency reveals whether a leader adds to performance or creates friction, shown here across the FTSE 350.
How Britain’s CEOs measure up.
| Rank | Company and chief executive | Seat difficulty | Stabilisation Efficiency | Load | Band |
|---|---|---|---|---|---|
| 1 | Next Simon Wolfson | 4.9 | 0.40 | 2.5 | Star |
| 2 | LondonMetric Property Andrew Jones | 4.8 | 0.40 | 2.4 | Star |
| 3 | Rolls-Royce Tufan Erginbilgic | 7.5 | 0.53 | 4.7 | System Calmer |
| 4 | Endeavour Mining Ian Cockerill | 7.3 | 0.53 | 4.6 | System Calmer |
| 5 | Costain Group Alex Vaughan | 6.3 | 0.53 | 4.0 | System Calmer |
| 6 | Helios Towers Tom Greenwood | 6.2 | 0.53 | 3.9 | System Calmer |
| 7 | Avon Technologies Jos Sclater | 6.1 | 0.53 | 3.8 | System Calmer |
| 8 | Genus Jorgen Kokke | 5.9 | 0.53 | 3.7 | System Calmer |
| 9 | Galliford Try Holdings Bill Hocking | 5.8 | 0.53 | 3.7 | System Calmer |
| 10 | Paragon Banking Group Nigel Terrington | 5.8 | 0.53 | 3.7 | System Calmer |
| 11 | Weir Group Jon Stanton | 5.6 | 0.53 | 3.5 | System Calmer |
| 12 | Currys Alex Baldock | 5.5 | 0.53 | 3.5 | System Calmer |
| 13 | Informa Stephen A. Carter | 5.5 | 0.53 | 3.5 | System Calmer |
| 14 | Cranswick Adam Couch | 5.4 | 0.53 | 3.4 | System Calmer |
| 15 | Grainger Helen Gordon | 5.2 | 0.53 | 3.3 | System Calmer |
| 16 | Greencore Group Dalton Philips | 5.2 | 0.53 | 3.3 | System Calmer |
| 17 | Morgan Sindall Group John Morgan | 5.2 | 0.53 | 3.3 | System Calmer |
| 18 | RELX Erik Engstrom | 5.2 | 0.53 | 3.3 | System Calmer |
| 19 | IMI Roy Twite | 5.1 | 0.53 | 3.2 | System Calmer |
| 20 | Derwent London Paul Williams | 4.8 | 0.53 | 3.0 | System Calmer |
| Stabilisation Efficiency range | Band | What it means |
|---|---|---|
| ≤ 0.49 | Star | The organisation is visibly calmer than the job would predict. Rare. |
| 0.50–0.74 | System Calmer | The leader is protecting the organisation from the weight of the job. |
| 0.75–0.99 | Stress Absorber | The leader is holding the organisation steady, at or near par. |
| ≥ 1.0 | Under Strain | The organisation is, for now, carrying more than the job alone explains. |
How the number is made.
These metrics resolve into a single, definitive number we call Stabilisation Efficiency (SE), which answers one question: to what extent is this leader enhancing business performance? The methodology works in three steps.
Measure the environment first
Every sector and every business carries its own inherent load: structural complexity, market uncertainty, legacy issues. We establish this baseline before assessing the leader, so the context is never mistaken for the person.
Isolate the leader’s effect
We then measure what the leader personally brings: their execution energy, their openness to feedback, their impact on alignment and conviction. The SE score is the relationship between the two: the load the organisation actually carries under this leader, versus the load its environment would predict.
Band and weight the result
Scores are calibrated against a demanding benchmark. Leaders are paid to add value, so par is set as a slight enhancement to business performance. Every assessment carries a Confidence Band (High, Medium or Low) based on evidence consistency and tenure, so a promising score never masquerades as a proven track record.
Judged on the reality they were handed.
Corestar distinguishes a leader steering through a collapsing market from one who is simply struggling. Because every SE score is environment-adjusted, a candidate who previously managed a troubled operation is judged on the situation they inherited, not against an impossible ideal.
This insight is available for CEOs and for C-Suite candidates.
Questions, answered.
What is Stabilisation Efficiency?
Stabilisation Efficiency (SE) measures a leader's capacity to reduce friction inside an organisation. It is derived from public signals, adjusted for the environment the leader inherited, and independent of share price and other lag indicators.
Does Corestar need access to the company or its management team?
No. Stabilisation Efficiency is derived entirely from public signals and requires no management access, no questionnaires and no footprint inside the target.
How is the SE score calculated?
In three steps: first, the inherent load of the sector and business is measured, so context is never mistaken for the person. Second, what the leader personally brings is isolated: their execution energy, openness to feedback, and impact on alignment. The SE score is the relationship between the two.
Is a leader judged against every other leader on the same terms?
No. Every SE score is environment-adjusted. A candidate who previously managed a troubled operation is judged on the situation they inherited, not against an impossible ideal.