Co-Sale Right (Tag-Along Right)

A co-sale right, more commonly called a tag-along right, is a contractual protection for minority shareholders in a private company. It says that if a major shareholder — often a founder or a controlling investor — sells their shares to a buyer, the minority holders have the right to join, or tag along in, that sale, selling a proportionate part of their own shares to the same buyer on the same price and terms. The right is written into an investment agreement or shareholders' agreement, typically when venture or private-equity investors put money in. Its purpose is to stop a controlling owner from arranging a lucrative exit for themselves while leaving smaller investors stuck holding illiquid shares in a company whose ownership and direction have just changed hands without them.

The right addresses a real imbalance of power in private companies. A founder or lead investor with a big block of stock can attract a buyer and negotiate an attractive deal; a small early investor usually cannot find a buyer for a minority stake on their own, because private shares are illiquid and buyers want control. Without a co-sale right, the big holder could sell and cash out while the minority is left as a small partner to an unfamiliar new majority owner. The tag-along right rebalances this by tying the minority's fate to the majority's: if the controlling holder gets liquidity on good terms, the minority gets to share in it proportionately. It is a standard clause precisely because it protects the party with the least leverage.

A co-sale (tag-along) right is easy to confuse with its mirror image, the drag-along right, and the two point in opposite directions. A tag-along right is a protection for the minority: it gives smaller holders the option to join a sale initiated by a major shareholder, so they can exit on the same terms if they choose. A drag-along right is a power for the majority: it lets a controlling shareholder force the minority to sell into a deal the majority has agreed, so a buyer who wants 100 percent of the company cannot be blocked by a few holdouts. Tag-along is a right the minority may exercise; drag-along is an obligation the majority may impose. One protects the small holder; the other protects the deal.

The two rights often sit side by side in the same shareholders' agreement, balancing each other. Drag-along ensures a clean sale of the whole company by preventing minority holdouts from wrecking a deal; tag-along ensures the minority is not exploited when the majority sells, by letting them come along on equal terms. Together they say, roughly: if the majority sells, the minority can join (tag-along), and if the majority wants to sell the whole company, the minority must join (drag-along), in both cases on the same terms. Reading a deal correctly means checking which right is being invoked and in whose favor, because a tag-along protects the person tagging along, while a drag-along constrains the person being dragged. Confusing them inverts who is protected.

For an investor, a co-sale right is a piece of downside protection to negotiate for and understand at the outset. Using it well means securing the right when you invest, defining clearly which sales trigger it (a change of control, a sale above some threshold), how much of your stake you may include, and on what terms. For a founder, understanding tag-along rights matters when planning any secondary sale of your own shares, because the right may pull minority holders into the transaction and change what a buyer must accommodate. In practice the value of the right shows up rarely but decisively — at the one moment a controlling holder exits — so the time to get it right is when the agreement is drafted, not when the sale is on the table.

The failures are missing the right entirely, drafting it loosely, and confusing it with a drag-along. An early investor who neglects to secure a tag-along can be left behind when a founder sells. A poorly drafted clause — vague on triggers, proportions, or terms — invites dispute exactly when a deal is time-sensitive. And treating a tag-along as if it were a drag-along inverts the protection, so a minority holder may think they can be forced out when in fact they hold the option to join, or a majority may assume it can compel a sale it has no power to compel. The discipline is to know which right you hold, to define its triggers precisely, and to remember that a co-sale right protects the minority, not the controlling seller. None of this is financial or investment advice.

A co-sale, or tag-along, right lets minority shareholders join a major holder's sale on the same terms — a standard investor protection that mirrors the majority's drag-along right.

Etymology: source.

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