Selected cases

UK Supreme Court · [2026] UKSC 21

Saxon Woods Investments Ltd v Costa

The UK Supreme Court held that a director breached the duty to promote the company's success by secretly undermining a board-approved exit...

UK Supreme Court14 July 2026

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Quick read

  • A director can disagree strongly with the board, but must use the company's governance process to do it.
  • The UK Supreme Court held that a director breached the duty to promote the company's success by secretly undermining a board-approved exit process.

Use this to check

  • Bring disagreement back to the board instead of working around it
  • Record decisions, delegated authority and dissent clearly
  • Do not present one position to fellow directors while pursuing another privately

Decision snapshot

  1. What happened

    • Saxon Woods invested in Spring Media on terms that included an agreed route to an exit.
    • The board later approved a sale process.
    • Mr Costa, Spring Media's chief executive and a director, said he believed a different strategy would produce a better result, but he did not bring that disagreement back to the board.
    • Instead, he covertly worked against the approved process while appearing to support it.
  2. What the court had to decide

    • Could a director satisfy the section 172 good-faith duty by saying he honestly believed his conduct would benefit the company, even though he secretly subverted a collective board decision?
  3. What the court decided

    • The Supreme Court dismissed Mr Costa's appeal.
    • It held that the good-faith duty applies to the way a director acts, not only to the outcome the director hopes to achieve.
    • Secretly frustrating a board decision while pretending to implement it was disloyal conduct and a breach of duty.

Practical impact

Practical read

  • A director can disagree strongly with the board, but must use the company's governance process to do it.
  • Honest belief is not a licence to run a private counter-strategy.
  • Raise the concern, ask for the decision to be revisited, record the dissent and then act within the authority actually given.

Useful next steps

  • Bring disagreement back to the board instead of working around it
  • Record decisions, delegated authority and dissent clearly
  • Do not present one position to fellow directors while pursuing another privately
  • Treat investor exit processes as board matters, not founder-side projects
  • Put material reservations before the full board

How the dispute started

Saxon Woods had invested in Spring Media and expected an agreed exit process to be pursued. When the board approved a sale process, chief executive and director Mr Costa preferred a different route.

The case did not arise simply because he disagreed. It arose because he kept that disagreement from the board and covertly worked against the approved strategy while maintaining the appearance that he was implementing it.

What the Supreme Court decided

The Court dismissed Mr Costa's appeal. A director's belief that a different course would help the company did not excuse disloyal methods. The section 172 duty to promote the company's success in good faith reaches the director's conduct as well as the intended result.

A single director cannot secretly replace a board decision with his own. The Court treated the covert subversion as a breach, and the buy-out remedy obtained by Saxon Woods was left standing.

The governance lesson

Good governance does not require silent agreement. It requires disagreement to happen through the proper forum. Directors should put contrary information before the board, ask for reconsideration and make the limits of their authority visible.

Key takeaways

  • Put material reservations before the full board
  • Record what the board decided and who can implement it
  • Escalate conflicts between management preference and board authority
  • Keep investor rights and exit processes tied to formal governance

What the case does not say

The decision does not mean a board majority is always right, or that a director must suppress a genuine concern. Directors still need to exercise their own judgment and comply with their duties. A director may need to challenge assumptions, seek more information, call for another meeting or record a firm dissent.

The dividing line is the method used. Mr Costa did not openly ask the board to reverse course. The Court was dealing with conduct that was concealed from fellow directors and inconsistent with the decision he appeared to be implementing.

Questions for a founder-led board

Questions to work through

  • Is the decision recorded clearly enough for management to implement it?
  • Has each director disclosed any personal or founder interest in a different outcome?
  • Does the chief executive's delegated authority match what the board expects?
  • Is there a route for urgent reconsideration if new information emerges?
  • Would emails, adviser instructions and investor communications tell the same story as the minutes?
  • Who will report back to the board on progress and departures from the approved plan?

These questions matter most when a founder is also a director and chief executive. The roles overlap in practice, but the authority attached to each role is not identical. A decision made collectively by the board cannot be treated as optional because the founder prefers another commercial route.

Common questions

Does a director have to agree with every board decision?

No. A director can challenge a proposal, vote against it and have dissent recorded. The problem in this case was covertly undermining the collective decision while appearing to support it.

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