Back to Launch Lingo™. Tag-along rights let minority shareholders join a sale that a major shareholder negotiates, selling their shares on the same terms and at the same price. Investors commonly call this a co-sale right, and it lives in a contract rather than in any statute.
Founders and early investors care because tag-along rights stop a large holder from cashing out privately and leaving everyone else behind. If a big holder sells, you get to sell too.
How tag-along rights work
A tag-along clause is negotiated as part of your funding terms and attaches to a proposed sale by a major holder, often a founder or a lead investor. Before that holder can sell to an outside buyer, the clause gives the protected holders a window to include a proportional slice of their own shares in the same deal.
The protected holders sell at the same price and on the same terms. The selling holder reduces the number of shares it sells so the buyer’s total purchase stays the same. Everyone shares the exit rather than one holder taking it alone.
What tag-along rights protect against
The core risk is a private side deal. Imagine a founder quietly selling a large block to a favorable buyer while minority holders sit locked out. Tag-along rights convert that private liquidity into shared liquidity.
Read the mechanics closely. Confirm how the proportional share is calculated, what notice you receive, and how long your window runs. Confirm which sales trigger the right and which are carved out, such as transfers to family trusts or estate planning.
Tag-along rights versus drag-along rights
Tag-along rights and drag-along rights are mirror images. Tag-along is a minority protection that lets you join a sale. Drag-along is a majority power that forces you to sell. In a venture financing the same document often carries both. Tag-along rights are frequently packaged with a company-level purchase right, and the two together are usually called co-sale rights in a combined right of first refusal and co-sale agreement.
Example: a co-founder agrees to sell 20 percent of the company to an investor who wants secondary shares. A tag-along clause lets the other preferred stock holders include their proportional share in that sale, so the liquidity is split rather than captured by one founder.
This is general information, not legal advice.