Refuse board members with too many concurrent directorships

The Board Seat Collector Problem: Why You Should Run From Candidates Who Can't Say No

Overboarding isn't a theoretical governance concern. It's a measurable drag on oversight quality, and the institutions that control trillions in assets have drawn hard lines in the sand. If your board hasn't done the same, you're already behind — and inviting scrutiny you don't need.

What Overboarding Actually Means — and Why It Persists

Let me translate what "overboarding" actually means in practice, because the term gets thrown around without enough precision. A director becomes overboarded when the aggregate time commitment of their concurrent board seats exceeds what any reasonable human can dedicate to each role. It sounds obvious when stated plainly. And yet.

The math is brutal. A meaningful directorship demands somewhere between 200 and 300 hours annually — prep time, committee meetings, the full board sessions, informal conversations with management, the reading you do on your own time. Stack four or five of those together, then add whatever the director's actual day job requires, and you're looking at a person who is either chronically stretched or chronically absent. Neither outcome serves shareholders.

The persistence of overboarding has everything to do with how boards recruit. The process is insular by design. Nominating committees favor people they know, people who've served before, people whose names carry instant credibility in a proxy statement. That creates a self-reinforcing cycle: the same well-connected individuals accumulate seats while fresh candidates — people who could actually dedicate the time — get overlooked because they lack the boardroom pedigree. Prestige compounds. So does the bandwidth problem.

Research backs this up with uncomfortable clarity: directors juggling four or more seats show notably lower attendance rates. Not slightly lower. Not "marginally below expectations." Measurably worse. And attendance is the crude proxy — it doesn't capture the quality of engagement, the depth of reading, or whether someone is truly present in a boardroom versus mentally running through their obligations at three other companies.

Overboarding isn't about ambition. It's arithmetic: there are only so many hours in a quarter, and every seat you add dilutes your attention at every table you sit at.

The Gatekeepers Have Drawn Hard Lines

If you think overboarding limits are soft suggestions, you haven't been reading the voting guidelines lately. The major proxy advisory firms and institutional investors have hardened their positions considerably, and recent proxy seasons have marked a notable escalation in enforcement, not just policy.

Here's the lay of the land:

BlackRock tightened its stewardship expectations, capping non-executive directors at four public boards — a full seat below the ISS and Glass Lewis standard. When the world's largest asset manager draws a stricter line, the market notices. And when ISS and Glass Lewis recommend "against" votes on overboarded directors at annual general meetings, those recommendations carry real weight. Not every institutional investor follows them mechanically, but enough do that the math shifts fast. A director who starts receiving negative vote recommendations becomes a liability for the entire board slate, not just a personal embarrassment.

The non-executive chair position draws even tighter scrutiny. The chair role is substantially more time-intensive than a regular independent director seat — you're shepherding agendas, managing board dynamics, acting as the primary counterweight to the CEO. Proxy advisors often cap chairs at three or four total positions, and frankly, even three can be a stretch depending on the complexity of the boards involved. A chair overseeing a multinational financial services board and a healthcare conglomerate simultaneously is living in two radically different regulatory and operational worlds. The cognitive switching cost is real, and the governance quality reflects it.

What's changed in recent years is enforcement discipline. It's no longer enough to have a policy on paper. Institutional investors now look at actual behavior — whether companies grant exceptions to their own overboarding limits, how quickly they act when a director becomes overboarded through appointment elsewhere, and whether nominating committees disclose their reasoning when they retain a director who exceeds guidelines. The era of quiet waivers is ending.

How to Actually Vet This

Here's where most nominating committees fumble. They check the résumé. They note the current directorships. They might even ask the candidate directly. But they don't do the real due diligence — the kind that surfaces the full picture.

Start with what's verifiable. In the United States, the definitive source is SEC Form DEF 14A — the proxy statement. Specifically, you're looking at the "Director Biographies" and "Other Public Directorships" sections. Every public company files this. If your candidate sits on boards you don't know about, DEF 14A will surface them. It's tedious. It's also non-negotiable.

For companies outside the U.S., the equivalent disclosures vary significantly. In the United Kingdom, the Companies House register and annual reports provide directorship data. The EU's transparency regimes under the Shareholder Rights Directive II require disclosure of multiple mandates. In markets like Japan and South Korea, cross-directorship disclosure is less standardized, which means your due diligence team has to work harder and dig deeper into local filings and commercial registries.

Beyond the filings, here's what a serious vetting process looks like:

1. Map every public board seat — not just the ones the candidate volunteers. Cross-reference through proxy filings of their listed companies. If the candidate serves on five public boards but only lists three, you have a disclosure problem that tells you something important about the candidate's approach to transparency.

2. Account for private company and nonprofit boards — these are harder to track and almost never disclosed in the same detail, but they consume real time. Ask directly, in writing, with a specific number request. A director who chairs two nonprofit boards and sits on a private company advisory board alongside four public directorships is functionally managing eight relationships, regardless of what the public filings show.

3. Check committee assignments across all boards — a director sitting on three audit committees simultaneously is carrying a qualitatively different burden than someone with one audit role and two governance committee slots. Audit committee membership demands the most time and carries the highest personal liability exposure. Comp committee work is similarly intensive. Map the full committee picture, not just the board count.

4. Verify attendance records — most proxy statements disclose meeting attendance percentages. Anything below 75% across concurrent boards is a red flag that practically screams overextension. Look for patterns, not just averages — a director who missed three consecutive audit committee meetings at one company while attending all meetings at another is telling you where their attention actually lives.

5. Assess the candidate's primary role — a retired executive with no operating duties has genuine flexibility. A sitting CEO of a complex organization does not. The context of their "other time" matters enormously. A former CFO who now does consulting and sits on boards has structurally different availability than an active CEO running a company through a restructuring.

6. Ask the hard question directly — "If conflicts arise between our board calendar and your other commitments, which takes priority?" The hesitation before the answer tells you everything. A candidate who can't answer this clearly hasn't thought about it, which means your board will be the one that loses when the conflict inevitably arrives.

The Governance Cost Nobody Quantifies

Proxy votes against overboarded directors are the visible consequence. The invisible one is worse: governance failure by a thousand small cuts.

An overboarded director misses the pre-read materials. They skim the backup instead of studying it. They defer to management on nuanced compensation questions because they haven't done the independent analysis. They rubber-stamp the auditor's work because they don't have time to pressure-test it. Each individual shortcut looks minor. Collectively, they create boards that exist in form but not in substance.

I've sat in rooms where a director — a genuinely brilliant person with deep industry expertise — offered nothing because they were clearly mentally elsewhere. Not incompetent. Not disengaged by temperament. Simply maxed out. The board had recruited them for their insight, and instead got a warm body filling a seat.

The downstream effects ripple further than most people recognize. When a board consistently includes overboarded directors, management learns to manage around them — preparing thinner materials, avoiding uncomfortable topics, steering conversations toward areas where directors won't push back. The board's oversight function atrophies. Not because anyone set out to weaken it, but because the people in the room stopped doing the work required to make it real.

Corporate governance news aggregators and research services can help you track executive movements and board changes worth watching — patterns of overboarding sometimes become visible only when you see a name recurring across multiple governance news cycles — but no aggregator replaces your own due diligence on the specific humans you're nominating.

And here's the hubris in the system: directors themselves rarely self-police. Board seats carry prestige, compensation, and social capital. Turning one down feels like leaving money and status on the table. So they accumulate, and nominating committees — flattered to land a "name" — don't ask the uncomfortable follow-up questions. The incentive structure rewards accumulation, and the governance checks that should catch it are staffed by people who benefit from the same system.

When Overboarding Rules Apply — and Where They Don't

Let me be precise about what overboarding is not. It's not illegal. There's no statute that says a person cannot serve on multiple boards. It's a governance norm enforced by shareholders and their advisory proxies — a market mechanism, not a legal one.

That distinction matters because it also means companies have discretion. An S&P 500 company faces far more institutional scrutiny on director capacity than a small-cap firm with a concentrated shareholder base. Some smaller companies allow more flexibility, particularly when the director in question provides genuinely irreplaceable expertise in a niche domain — say, a rare regulatory specialist in a heavily regulated industry where qualified board candidates are genuinely scarce.

But discretion should not become a loophole. The companies that play games with their own overboarding policies — granting exception after exception, grandfathering directors who were compliant when elected but are now overboarded — send a message to shareholders that governance guidelines are decorative. Institutional investors are watching for exactly this kind of selective enforcement, and the proxy advisory firms have become adept at distinguishing between legitimate exceptions and convenient rationalizations.

The responsibility sits with your nominating and governance committee. They can:

• Set formal overboarding limits in the Corporate Governance Guidelines — and actually enforce them, rather than treating them as aspirational.

• Implement interlocking directorate policies that prevent the same individuals from appearing across related boards, which multiplies the concentration problem.

• Require annual disclosure from every director about their full portfolio of commitments, not just public board seats.

• Build sunset provisions — if a director's external commitments cross a threshold during their tenure, they agree in advance to step down from the seat that matters least.

• Tie overboarding compliance to renomination — directors who exceed limits without committee-approved exceptions simply aren't renominated. No ambiguity, no negotiation.

The companies that get this right don't treat it as a compliance checkbox. They treat it as a competitive advantage in board composition. Because when you're not wasting seats on someone who can't show up prepared, you can recruit people who actually will. Board quality isn't just about who's in the room — it's about whether those people have the bandwidth to do the work the room exists to accomplish.

The Bottom Line

Here's what I know after watching board dynamics across cycles: the director who says yes to everything serves no one well. Your nominating committee's job isn't to collect impressive résumés — it's to build a board where every person in that room has the time, energy, and cognitive bandwidth to actually govern. If your candidate's calendar says otherwise, trust the calendar. The next big governance failure almost always starts with a room full of people who had somewhere else to be.