How Many Non-Executive Roles Is Too Many?

By Adrian Lawrence FCA, founder of NED Capital · Part of the Board Governance Hub

It is one of the most practical questions in a portfolio career, and there is no single tidy answer to it — but there is a good one. The temptation, once you have one or two rewarding board roles, is to keep adding. Each seems manageable on its own; the risk is cumulative. Understanding where the real constraints lie — in the rulebook, in investor expectations, and above all in your own diary — is what separates a well-run portfolio from an overextended one.

There Is No Legal Limit — But There Are Limits

UK law sets no cap on the number of directorships one person may hold. The nearest thing to a formal limit is in the UK Corporate Governance Code, which takes a principles-based rather than a numerical approach: it requires that each director has sufficient time to meet their board responsibilities, and asks that other significant commitments be disclosed before appointment and as they arise. The one hard number the Code prescribes is narrow — a full-time executive director should not take on more than one non-executive directorship in a FTSE 100 company, nor the chairmanship of such a company. Beyond that, the Code deliberately leaves “how many is too many” to be judged case by case, on the view that a rigid cap would be too blunt an instrument for the huge variation in how demanding different roles are. So the honest answer to the headline question is: the law will not tell you, and neither, precisely, will the Code. The real limits lie elsewhere.

What Investors and Proxy Advisers Expect

Where the Code is silent on numbers, investors and their proxy advisers have filled the gap — and for anyone holding or seeking roles at listed companies, these expectations are the practical constraint. The influential proxy advisers generally regard a non-executive director sitting on more than around five public-company boards as potentially overboarded, and will consider recommending shareholders vote against a director’s re-election on that basis unless there is good reason. Some large asset managers have moved to tighter thresholds still, flagging non-executives on four or more public boards. Two refinements matter. First, a chair role is typically counted as the equivalent of two ordinary seats, reflecting its heavier load — as, increasingly, are demanding committee positions such as an audit committee chairmanship. Second, the standard is stricter for anyone who also holds an executive role elsewhere, since a sitting chief executive has far less spare capacity than a full-time portfolio non-executive. The direction of travel in recent years has been away from a simple seat count and towards an assessment of total time commitment. These thresholds are conventions rather than law, and they shift, so anyone active at listed-company level should check the current guidance — but as a rule of thumb, once a non-executive is past roughly five public boards, questions will be asked.

The Real Test Is Capacity, Not a Number

Numbers are a useful signal, but they are a proxy for the thing that actually matters: whether you have the time and attention each role genuinely requires. This is where the honest self-assessment happens, and it turns on a simple comparison — the days each board demands against the days you actually have. A single listed-company non-executive directorship can absorb far more time than the headline “days per year” figure suggests once preparation, committee work and between-meeting issues are counted, a point we explore in how many days a year a NED role takes. A demanding chair or committee-chair role counts for far more than a straightforward seat on a stable board. And critically, the roles are not independent of one another: five calm boards may be perfectly manageable until two of them hit trouble in the same quarter, at which point the total demand can exceed anything the individual figures implied. The right question is therefore not “how many can I technically hold?” but “can I give every one of these boards what it is entitled to expect, including when one of them is in difficulty?”

Why Crisis Headroom Is the Overlooked Factor

The single most under-appreciated element of capacity is headroom for the unexpected. In normal times, a well-organised non-executive can carry a surprising number of roles, because routine board work is predictable and schedulable. The problem is that board work is not always routine. A regulatory investigation, a failed transaction, a sudden liquidity problem, the departure of a chief executive — any of these can turn a light-touch role into one demanding intensive involvement for weeks, and it always happens without warning and rarely one board at a time. This is precisely the concern investors have when they push back on overboarding: an overcommitted director may simply not have the bandwidth to respond when a company needs them most. A portfolio built to be full in calm conditions is, by definition, over-full when a storm arrives. The disciplined approach is to carry deliberately less than your theoretical maximum, so that you retain the capacity to step up for the board that needs you.

The Cost of Getting It Wrong

Overboarding is not a victimless matter of personal workload. A director who is stretched too thin contributes less: preparation slips, challenge weakens, and oversight becomes superficial — and because each directorship carries the same personal legal duties and potential liability regardless of how many others you hold, a thin commitment is also a personal risk. There is a reputational dimension too. Being seen as an overboarded director can count against you with investors and with the nomination committees of boards you might wish to join, since a reputation for spreading yourself too thinly is hard to shed. And there is a simple quality argument: the value of a non-executive lies in judgement, engagement and independent challenge, all of which depend on genuinely knowing the business — something that is impossible to do across too many boards at once. Doing three or four roles genuinely well is worth far more, to you and to the companies, than doing six of them adequately.

How to Judge Your Own Limit

In practice, the sensible approach is to assess each new opportunity against your existing commitments rather than against an abstract number. Before accepting a role, add up the realistic time it will demand — not the optimistic figure — alongside everything else you carry, and ask honestly whether you can meet it, crises included. Weight chair and committee-chair roles more heavily. Factor in any executive commitments, which materially reduce your available capacity. Be honest about the seasonal peaks — year-end, audit, budget — when several boards may demand attention at once. And leave genuine headroom rather than filling every available day. Managing the time across several boards is itself a distinct discipline, covered in our guide to being an effective multi-board NED. For most people building a portfolio, the answer lands somewhere between three and five meaningful roles, adjusted heavily for their weight and for whatever else the individual is doing — but the number is always downstream of the real question, which is capacity.

“Too many”, in the end, is not a figure on a page — it is the point at which you can no longer give each board the engaged, prepared, independent contribution its directors are entitled to expect. Staying the right side of that line is one of the marks of a professional non-executive. At NED Capital we work with board-ready candidates building sustainable portfolios, as well as the boards appointing them, and we take a director’s real capacity seriously in every conversation. Each search is led personally by Adrian Lawrence FCA, a Fellow of the ICAEW and former listed-company finance director.

NED Capital | Sister practice of FD Capital | ICAEW practising certificate held by Adrian Lawrence FCA.