Shareholders' agreement guide for UK startups

Model articles cover the mechanics of running a company — director appointments, share transfers, general meetings — but they assume goodwill and say almost nothing about founder behaviour. They do not require a founder to keep working in the business, do not restrict a departing founder from competing, and do not stop a majority shareholder from making decisions that dilute or disadvantage a minority.

A shareholders' agreement fills those gaps contractually. Where the two documents conflict, the position is nuanced: the articles bind the company constitutionally, so a well-drafted agreement usually includes a clause requiring shareholders to vote to amend the articles if any inconsistency arises. Getting the interaction right is part of the drafting job, not an afterthought.

Vesting means a founder earns their equity over time — commonly four years with a one-year cliff — rather than owning it outright from day one. Without vesting, a co-founder who leaves after six months keeps a third of the company while the remaining team does the work. Investors will insist on vesting later, so agreeing it early is easier and cheaper than retrofitting it.

Leaver provisions classify departures as 'good' or 'bad'. A good leaver (ill health, redundancy, agreed exit) typically keeps vested shares or is bought out at fair value. A bad leaver (resignation within a defined period, dismissal for cause, breach of restrictive covenants) may be required to transfer shares at nominal value or the lower of cost and market value. Define each category precisely: vague wording here produces the most expensive arguments we see.

Reserved matters are decisions that cannot be taken without a specified level of consent — for example, issuing new shares, borrowing above a threshold, changing the nature of the business, selling material assets or approving director remuneration. They protect minority shareholders and give investors comfort without handing them day-to-day control.

Keep the list proportionate. A schedule of forty reserved matters in a five-person company means every routine decision needs a written consent, and in practice the list gets ignored — which is worse than not having one, because it creates a pattern of breach. Ten to fifteen genuinely significant items is usually right at seed stage.

Pre-emption rights require a shareholder who wants to sell to offer their shares to existing shareholders first, at a price set by a defined mechanism. This stops shares drifting to strangers or competitors.

Drag-along lets a defined majority force minority shareholders to sell on the same terms when a buyer wants 100% of the company — without it, a single holder of 2% can block a trade sale. Tag-along is the mirror protection: if the majority sells, minority holders can require the buyer to take their shares on identical terms. Both should be in the agreement and reflected in the articles so they bind future shareholders.

In a 50/50 company, deadlock is a structural risk, not a personality problem. Options include an independent chair with a casting vote, expert determination, mediation as a mandatory first step, or a 'Texas shoot-out' buy-sell mechanism. Each has trade-offs: shoot-out clauses favour the shareholder with more cash, so consider whether that outcome is acceptable before agreeing one.

Also address what an exit looks like. Do the shareholders commit to reviewing a sale after a set period? Who runs the process? Are there agreed advisers? Founders rarely think about exit at incorporation, but a short clause now prevents a stalemate later.

Startups around Oxford, Reading, Milton Keynes and the wider Thames Valley often have university spin-out connections, EIS or SEIS investors, and employees on share option schemes. Each affects the drafting: spin-out companies may have institutional consent rights, SEIS and EIS investors need shares that carry no preferential rights that would breach the relief conditions, and an EMI option pool needs to be reflected in the cap table and the dilution provisions.

The order of work matters. Agree the commercial deal in a short heads of terms first, then draft. Negotiating principles inside a 40-page document costs more and takes longer.