Company Announcement
MindGym plc (AIM: MIND) said Octavius Black CBE will step down as Executive Chair and from the board due to ill health, effective 3 Aug 2026. David Nelson will chair the board on an interim basis while a new chair is sought. CEO Christoffer Ellehuus and executive leadership remain unchanged.
How this was made

The 30-second read
Why it matters
The immediate effect is governance and succession uncertainty at the Executive Chair level. Operational leadership (CEO and senior management) is stated as unchanged, which can limit fundamental downside but may still drive short-term sentiment and valuation multiple changes for an AIM small-cap.
Market read
A concrete board leadership change effective today can affect AIM small-cap risk perception, even without new financial metrics.
What to watch
Investors will likely focus on the chair appointment process timeline and whether David Nelson’s interim role signals continuity versus strategic redirection.
Background
MindGym is an AIM-listed behavioural science company; this release covers a director and chair transition due to ill health.
Ticker impact
MindGym announces Octavius Black stepping down as Executive Chair and Board member due to ill health, effective 3 Aug, with David Nelson as interim chair.
Near-term volatility risk around governance headlines; direction depends on market confidence in interim chair and succession process.
The article discloses a concrete board change and interim chair appointment, but provides no financial guidance, deal, or operational update.
Market effects
Could modestly affect sentiment toward small-cap behavioral science/consulting peers via perceived governance stability.
UK AIM small-cap governance news can move liquidity and risk premia locally.
Limited global spillover; primarily affects UK-listed small-cap investor positioning.
Counterpoint
Because the CEO and executive leadership are unchanged and the co-founder remains a large shareholder, the market may treat this as a manageable governance adjustment rather than a fundamental deterioration.
Key entities
- issuerMindGym plc
Behavioural science company announcing Executive Chair and board change.
- directorOctavius Black CBE
Co-founder stepping down as Executive Chair and from the Board due to ill health.
- directorDavid Nelson
Non-executive director appointed interim Board chair; process to appoint a new Chair to follow.
- executiveChristoffer Ellehuus
CEO stated as unchanged, supported by the senior management team.



