What Are Tag-Along Rights? A Guide for Startup Founders

October 9, 2026

A few years into building a company, many founders get their first offer to buy part of their common stock at the last round's price. The offer looks simple until your counsel opens the Right of First Refusal (ROFR) and Co-Sale Agreement from your Series A. That agreement gives your investors tag-along rights, which let them sell into the same deal and affect your liquidity from the first priced round through an acquisition. This guide explains how tag-along rights work and which of their terms you can negotiate.

What Are Tag-Along Rights

A tag-along right is a contractual option that lets a smaller shareholder sell alongside a larger shareholder at the same price and on the same terms. The holder can pass and let the sale close without them, or opt in and fill part of the buyer's order with their own shares. Neither choice gives the holder a way to block the sale.

In U.S. venture deals, the same right goes by the name co-sale right. It appears in the ROFR and Co-Sale Agreement, part of the National Venture Capital Association (NVCA) model legal documents for a priced round. In a startup, the seller is typically you and the holder tagging along is your investor. Outside venture financings, shareholder agreements often use tag-along provisions to protect minority holders when a majority holder sells.

How Tag-Along Rights Work

You start the process by sending the company and every investor a written notice of the planned sale, naming the buyer, the price and the form of payment. In our example, you've agreed to sell 100,000 shares to an outside buyer at $10 per share, or $1 million in total. Once the company and your investors pass on buying those shares themselves, investors get a fixed window to decide whether to sell alongside you. Investors who miss that deadline are typically treated as having passed on that sale.

When two investors opt in, the agreement splits the buyer's 100,000 shares by holdings: you hold four million shares, Investor A three million and Investor B one million. That split gives you 50,000 shares, Investor A 37,500 and Investor B 12,500. Your buyer still pays $10 a share on the terms in your notice, but your proceeds drop from $1 million to $500,000. Counsel can confirm how your agreement calculates the pro rata split before you quote a buyer a share count.

Tag-Along vs. Drag-Along Rights and the Right of First Refusal

Founders often confuse these rights because they arrive in the same set of closing documents and all govern who can move shares. A typical venture financing splits them like this:

Who holds each right: The company holds the first ROFR, and investors hold a secondary ROFR plus the co-sale right over founder sales. Stockholders holding a specified majority, sometimes with board approval, can trigger the drag-along.
What each right lets the holder do: A ROFR lets the holder buy the shares a founder wants to sell, at the third party's price. Co-sale lets the holder sell alongside the founder, and a drag-along lets the approving majority force minority stockholders to vote for a company sale.
Whether participation is optional or binding: The ROFR and the co-sale right are optional for the holder, who can decline. A drag-along binds the minority once the required majority approves the deal.
When each applies: Any proposed founder transfer goes through the ROFR first, and co-sale covers only the shares its holders decline to buy. Drag-along rights apply to an approved sale of the whole company.

The ROFR and co-sale right share one agreement, with the drag-along provision set out separately in the Voting Agreement.

When Tag-Along Rights Come Into Play for Startups

Once your priced round closes, the co-sale right comes up only when someone wants to sell shares. Direct sales of U.S. startup shares have grown quickly and reached an estimated $91.7 billion in 2025, nearly double the prior year. The right works differently in a founder secondary, a company tender offer and a controlling stake sale.

Founder Secondary Sales

In a founder secondary, the co-sale right covers your own shares and limits how many of them you can sell. Investors want that protection because it stops a founder from cashing out while they stay locked into the company. Your bylaws and stockholder agreements may require board and investor approvals before any shares change hands.

Company Tender Offers

A company-sponsored tender offer lets eligible holders sell shares at one board-approved price. The company obtains the required waivers once for the whole transaction, which spares each seller the usual notice process. Federal rules keep a tender offer open for at least 20 business days, and the company can cap participation by holder group. In September 2025, CRV-backed Vercel paired its Series F with a roughly $300 million tender offer for certain employees, former employees and early investors.

Controlling Stake Sales

The venture co-sale right covers sales by founders, so a diluted founder has no right to join when an investor sells its block to a strategic buyer. Many founders reach this point after a few rounds of dilution leave them with a minority stake. Founders who want reciprocal tag-along protection can ask for it in the Series A term sheet.

Holders can also lose a negotiated right through the agreement's amendment clause. In Khan v. Warburg Pincus (2025), the Delaware Court of Chancery upheld an amendment by a class majority that removed minority tag-along rights before a private equity merger. Founders can ask counsel whether their own amendment clause lets a class majority remove a right without each holder's consent.

What to Negotiate in a Tag-Along Clause

It's easy to sign the ROFR and Co-Sale Agreement without realizing how tightly it restricts your own shares. These clauses deserve your counsel's time before you sign:

Trigger threshold: The right can attach to every sale, only to transfers above a percentage of your holdings or only to a change of control. Exempting small transfers keeps routine sales out of the notice process.
Permitted transfers and carve-outs: Common exemptions cover estate planning transfers to family trusts, de minimis transfers, pledges of stock to a lender and transfers to entities you control. Investors resist overly broad carve-outs, such as an annual allowance that keeps stacking until a large stake has moved.
Who qualifies: Many agreements reserve the co-sale right for Major Investors above a set ownership floor, and an investor who dilutes below it in a later round loses the right.
Scope of "same terms": Each tag-along seller should give seller representations only about its own title and cap its indemnity and escrow exposure at its own proceeds. Anti-avoidance language can stop a buyer from moving extra value into a consulting deal or earn-out reserved for the main seller.

With these clauses drafted well, you can make routine transfers without asking investors for a waiver.

How Tag-Along Rights Shape Founder and Investor Liquidity

Until an initial public offering (IPO) or a sale of the company ends the agreement, your investors can use tag-along rights to join most sales of your stock. The best time to negotiate the triggers and carve-outs is during term sheet talks, before you sign the ROFR and Co-Sale Agreement.

Your lead investor is usually the one negotiating these terms with you. CRV participates in subsequent rounds for the companies it backs, so founders don't need to re-pitch existing investors each time they raise. If you're an early stage founder looking for a lead investor who takes a board seat at your Series A, reach out to us to see if we'd be a good fit.

Frequently Asked Questions About Tag-Along Rights

Are tag-along rights standard in venture capital deals?

Tag-along rights are standard in priced venture rounds and appear in one of the five core NVCA financing documents. Rounds raised on a simple agreement for future equity or a convertible note don't include them, because those instruments convert into stock later and skip the stockholder agreements.

Can tag-along rights be waived?

Agreements commonly let a defined majority of rights holders waive the co-sale right for a specific transaction, and many founder secondaries close this way. A written waiver from the required group, signed before any shares move, heads off later disputes over informal consent. Naming the buyer, the share count and the price in the waiver limits it to that sale and keeps the right intact for the next one.

What happens if a shareholder sells without honoring tag-along rights?

Depending on the agreement, the affected investor may have a put right that requires the seller to buy the shares the investor would have sold, on the same terms. Some agreements also declare non-compliant transfers void, though whether a court unwinds one depends on the exact language. An investor who moves quickly may seek injunctive relief before the transfer closes.

When do tag-along rights end?

The standard form terminates at an IPO, and the NVCA model also ends the agreement on a sale of the company. Later financing rounds usually amend and restate the agreement to add new investors, which gives founders a chance to revisit its terms.

Meta title: Tag-Along Rights: A Guide for Startup Founders

Meta description: Learn how tag-along rights affect founder secondary sales, tender offers and the terms startup founders can negotiate.

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