The short version
- The shareholder agreement is private and contractual; the bylaws or articles are the company's public constitution. Where the two conflict, the constitutional document generally prevails unless the agreement contains a supremacy clause.
- Drag-along protects the majority by forcing a minority to sell into an exit. Tag-along protects the minority by letting them sell on the same terms. Most companies need both, and a drag threshold around 75% is common.
- Pre-emption is two different clauses sharing a name: pre-emption on issue, which stops dilution when new shares are created, and pre-emption on transfer, which gives existing holders first refusal when someone sells.
- The clause most often missing is valuation. Agree the method while everyone still has the same interest in the answer, because on the day someone leaves the two sides want opposite numbers.
Where the agreement sits relative to the bylaws
Every company has a constitutional document. In the United States a corporation has a certificate of incorporation and bylaws; in the UK and most of the Commonwealth it has articles of association. That document is filed or filable, largely public, and governs the company as an institution: share classes, board composition, meetings, voting.
A shareholder agreement is something else. It is a contract between the shareholders — sometimes with the company as a party — and it is private. Nothing requires you to have one. What it buys is the ability to write terms that the constitution cannot comfortably carry, and to keep them out of public view.
| Bylaws / articles | Shareholder agreement | |
|---|---|---|
| Required? | Yes — a company must have one | No — optional, and most small companies do not |
| Public? | Generally, on the register | Private contract between the parties |
| Binds | Every shareholder automatically | Only the people who signed it |
| Changed by | A shareholder vote at the statutory majority | Unanimous consent of the parties, unless it says otherwise |
| Good at | Structure, share classes, meetings, voting | Exit, valuation, minority protection, deadlock |
Reserved matters: the clause that actually allocates control
Ownership percentages get all the attention and decide less than people think. A 30% shareholder with a veto over the things that matter has more real control than a 51% shareholder without one. Reserved matters — sometimes called consent rights or protective provisions — are the list of decisions the board cannot take without a specified shareholder or class agreeing.
A typical list covers issuing new shares, borrowing above a threshold, selling the business or a material asset, changing the nature of the business, appointing or removing directors, related-party transactions, and winding up. The negotiation is not really about which items appear; it is about the thresholds, and about how many people can say no.
A long reserved-matters list looks like prudence and behaves like a handbrake. Every item is a place where an ordinary business decision can stop. Draft it to catch things that change the company, and set money thresholds high enough that the board can still run the company between meetings.
A shareholder agreement, taken apart
Shareholder agreement
Pre-emption is two clauses with one name
This is the most common source of confusion in the whole document, and the two versions protect against completely different things.
- Pre-emption on issue. When the company creates new shares, existing shareholders get first refusal on their proportionate slice. This is anti-dilution: without it, a majority can issue shares to itself and shrink everyone else. It is the minority's single most important protection, and it is the one most often waived in a hurry during a financing.
- Pre-emption on transfer. When a shareholder wants to sell, they must first offer the shares to the company or to the other shareholders, usually at the price a third party has offered. This is about who you end up in business with rather than about dilution. It is also the reason share sales in private companies take months.
Both are normal and both are worth having. The drafting question is what happens when they collide with the drag-along, and the answer is that if the agreement is silent, the pre-emption rights will usually take priority — which can stall a whole-company sale while the transfer machinery grinds through. Say explicitly that pre-emption on transfer is disapplied where the drag is being exercised.
Drag-along and tag-along
Both are triggered by a sale to a third party, and each protects the opposite side.
Drag-along lets holders of a stated majority — commonly around 75%, sometimes lower depending on how the parties are positioned — require everyone else to sell on the same terms. Buyers of private companies usually want 100% of the equity, and a single 4% holder who refuses can otherwise stop the transaction or extract a premium for agreeing. The drag is what makes an exit deliverable.
Tag-along is the answer to the risk the drag creates. If the majority is selling, the minority can insist on being included at the same price and on the same terms rather than being left behind holding a stake in a company now controlled by a stranger.
The four positions a buyer can leave a minority holder in
Is there a drag-along?
Is there a tag-along?
No
Yes
No
A 4% holder can stop the sale
Buyers of private companies usually want all of the equity. One refusal blocks the deal, or extracts a premium for agreeing.
Nobody is stranded, nobody can exit
The minority may join a sale it cannot compel, and the majority still cannot deliver 100% to a buyer.
Yes
Dragged, and no right to join
You can be required to sell — and if the majority sells only its own stake instead, left holding a minority in a company run by a stranger.
The workable pair
An exit the majority can actually deliver, on terms the minority is entitled to share. Say expressly that pre-emption on transfer is disapplied when the drag fires.
Shareholder agreement template
The full text free to read and copy — share classes, reserved matters, pre-emption, transfer restrictions, drag and tag, leaver provisions and deadlock.
Leaver terms and the valuation nobody agreed
At some point a shareholder stops being involved: they resign, they are dismissed, they retire, they die, they divorce, they go bankrupt. The agreement should say what happens to their shares in each case, and by far the most consequential detail is how the price is determined.
The standard structure distinguishes a good leaver from a bad leaver — the first sells at fair value, the second at a formula price or at cost. It follows that the definitions carry the entire economics of the clause, and they are where the negotiation should be spent. "Bad leaver" defined as dismissal for gross misconduct is one thing; defined as leaving for any reason within three years is another entirely.
Then valuation. Fair value determined by whom, on what basis, and who pays for it. Options are an agreed multiple of earnings, a formula fixed in the agreement, the auditors acting as expert rather than arbitrator, or a named independent valuer. Whichever you pick, pick it now. On the day someone leaves, the buyer wants a low number and the seller wants a high one, and no method proposed at that point will look neutral to either.
Deadlock, and why 50/50 is the worst split
Two shareholders with equal stakes and no tie-breaker have no mechanism to resolve a disagreement. Nothing gets decided, and the only remedy left is asking a court to wind the company up. That is expensive, slow and destroys the value both sides were arguing about.
The usual escalation is mediation first, then a mechanical solution. The mechanical options have theatrical names and simple logic.
- Russian roulette. One shareholder names a price per share. The other must either buy at that price or sell at it. Because the offeror does not know which they will be, the price has to be one they would accept on either side of the trade.
- Texas shoot-out. Both sides submit sealed bids to a neutral party, opened together; the higher bid buys out the lower. Fast and final, and it tends to produce a premium.
- Auction. An open process where the owners bid against each other for the whole, without the penalty for bidding low that a shotgun clause creates.
- Third-party tie-breaker. An independent director, an industry expert, a mediator or an arbitrator resolves the specific matter or sets a valuation. Slower, but it does not end the relationship.
These only work fairly where the parties have comparable financial strength. A buy-or-sell mechanic between a well-capitalised shareholder and one who cannot raise the money is not a deadlock breaker; it is a one-way option. If the sides are unequal, use a valuation-and-buyout route with staged payments rather than a shootout.
The same reasoning applies with the same force to a two-member LLC, where the deadlock provision sits in the operating agreement instead — see does your LLC need an operating agreement.
What a shareholder agreement cannot do
It binds only its signatories. Someone who acquires shares without signing a deed of adherence is not caught by it, which is why every transfer provision should make execution of that deed a condition of registration.
It also runs into the limits of what shareholders may agree about the management of the company. In Delaware this became a live question in 2024, when the Court of Chancery struck down a stockholder agreement in which a board had contractually handed core decisions to a founder. The legislature responded within months by adding section 122(18) to the General Corporation Law, effective 1 August 2024 and retroactive, expressly permitting corporations to contract with stockholders to grant governance and consent rights. The episode is a useful reminder: how far these agreements can go is a question of state law, and it moves.
The version to write first
A short agreement that is signed beats a comprehensive one that stays in draft while everyone is busy. If you can only settle four things, settle these: pre-emption on issue, so nobody can be diluted out; pre-emption on transfer, so nobody can sell to a stranger; a leaver clause with a stated valuation method; and a deadlock mechanism if the split is even. Drag and tag can be added at the first financing, when a lawyer will insist on them anyway. Those four are the ones that are impossible to agree after the argument has started.
Sources
- Drag-along and tag-along rights, and their interaction with pre-emption — DWF
- Drag-along, tag-along and pre-emptive rights explained
- Deadlock provisions in operating and shareholder agreements
- Russian roulette and Texas shootout deadlock mechanics
- Shareholders' agreements and articles of association compared
- Delaware codifies stockholder agreements in DGCL section 122(18) — Baker Botts
General information, not legal advice. This guide explains how these documents and rules generally work. Law varies by jurisdiction and changes, and none of it is applied to your circumstances here. For anything consequential, consult a licensed attorney where you are.
Frequently asked
Do we need a shareholder agreement if we already have bylaws?
They do different jobs. Bylaws or articles govern the company as an institution — share classes, meetings, board procedure — and bind every shareholder automatically. A shareholder agreement is a private contract covering the things between owners: what happens when one wants to sell, how a departing holder is valued, what needs everyone's consent, and how a tie is broken. Most closely held companies want both.
What is the difference between drag-along and tag-along rights?
Drag-along lets a stated majority force minority shareholders to sell into a third-party sale on the same terms, so a buyer can acquire 100% of the company. Tag-along lets minority shareholders insist on being included when the majority sells, at the same price and terms, so they are not left holding a stake in a company controlled by someone they never chose. One protects the majority, the other the minority.
What threshold should trigger the drag-along?
Around 75% of the shares is common, though it varies with how the parties are positioned and can be lower. Two points matter more than the number. First, the threshold should be high enough that a single shareholder cannot unilaterally force everyone into a sale. Second, the clause should say whether non-cash consideration counts, and what warranties a dragged shareholder can be required to give.
Can a shareholder agreement override the bylaws or the articles?
Not directly. Where the two conflict, the constitutional document generally prevails, because that is what governs the company. The usual fix is a supremacy clause: the shareholders agree between themselves that the agreement takes precedence and that they will vote to amend the constitution to match. That binds the signatories as a matter of contract, but it does not change the public document until they actually amend it.
What happens if we deadlock and there is no deadlock clause?
Very little gets decided, and the remaining route is a court. Depending on the jurisdiction that means a petition for judicial dissolution, an oppression or unfair prejudice claim, or an application for a court-ordered buyout. All of them are slow, public and expensive, and the value being fought over usually falls while they run. A mediation step plus a buy-sell mechanic in the agreement costs nothing by comparison.