The Rights That Decide What Happens to Your Shares Are Not in the Share Itself
Owning ten percent of a company tells you almost nothing about whether you can sell, whether you can be forced to sell, or whether your stake can be diluted. The shareholder agreement decides all three.
Shares Are Not Self Contained
In a public company a share is broadly a share. You can sell it whenever the market is open, and your rights are largely standardised.
Private companies work differently. The shares themselves may be ordinary in the constitutional documents, but a separate shareholder agreement among the owners adds a set of contractual rights and restrictions that determine what the shares actually do.
This is why a headline ownership percentage in a private company can be badly misleading on its own.
You Probably Cannot Just Sell
Private company shares almost always carry transfer restrictions. The two common forms are a right of first refusal, under which existing shareholders or the company may match any offer you receive before you sell to an outsider, and a straightforward requirement for board consent to any transfer.
Both exist for a defensible reason: the other shareholders chose their partners and do not want a stranger, or a competitor, arriving in the ownership without their agreement. The consequence for a minority holder is that the stake may be extremely difficult to convert into cash.
An illiquid stake in a valuable company can be worth far less to its owner than the arithmetic suggests, because there may be no permitted route to a buyer.
Being Dragged and Tagging Along
Two provisions handle what happens when the company is sold, and they point in opposite directions.
| Provision | Who it protects | Effect |
|---|---|---|
| Drag along | Majority | Minority can be forced to sell on the same terms |
| Tag along | Minority | Minority can insist on being included in a sale |
Drag along exists because most buyers want one hundred percent of a company and will not proceed if a small holder can refuse. Without it, a single objecting shareholder could block a sale everyone else wants, which gives that holder leverage far beyond their stake.
Tag along prevents the opposite abuse, where majority holders sell their stake at a good price to a buyer who then has no interest in the remaining minority. It ensures the minority can exit on the same terms rather than being left as a small holder under a new owner.
Protection Against Dilution
When a company issues new shares, existing holders own a smaller percentage unless they participate. Preemptive rights, sometimes called participation rights, give existing shareholders the right to buy their proportionate share of any new issuance, so they can maintain their percentage by putting in more money.
Separately, investors in priced rounds usually hold anti dilution protection, which adjusts their conversion terms if the company later sells shares at a lower price. This is protection against a down round specifically, not against ordinary dilution, and its severity depends on which formula was negotiated.
Information and Board Rights
Minority holders commonly negotiate the right to receive financial statements on a schedule, and sometimes the right to appoint a director or to attend board meetings as an observer.
These sound procedural and are substantive. Without contractual information rights, a minority shareholder in a private company may have no reliable way of knowing how the business is performing, which makes it impossible to assess the value of the stake or to identify problems early.
Why This Matters Before You Sign
Employees receiving equity and founders taking early investment often focus entirely on the percentage and the valuation. Those are the least durable terms. The transfer restrictions, the drag along, the liquidation preferences, and the information rights determine what actually happens in every scenario that matters.
A smaller stake with clean rights is frequently worth more than a larger one that cannot be sold and comes with no visibility.
The Bottom Line
In a private company the share is the smaller half of what you own. The shareholder agreement determines whether you can sell, whether you can be made to sell, whether you can defend your percentage, and whether you can even see the numbers. Anyone valuing a private stake from the percentage alone is reading the wrong document.