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The Corestar Index
for the FTSE 350
Behaviour determines how well a company executes. Corestar measures it. This paper shows where friction is hiding across the FTSE 350, what it costs, and which leaders are pulling ahead.
The Corestar CEO Index
How Britain’s CEOs rank.
Ninety-nine FTSE 350 leaders, ranked by Stabilisation Efficiency: the friction they remove, set against the difficulty of the seat they inherited.
The Corestar Index · top 5 of 99Seat difficulty scored 0 to 10
| 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 |
Seat difficulty is the difficulty of the job each leader inherited, so a high seat difficulty at a low SE is a leader running a hard job calmly. Source: The Corestar Index for the FTSE 350, White Paper 3, September 2026.
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