A stockholder agreement binds shareholders to rules on transfers, information, and control that may not appear in the certificate of incorporation.

How it works

Parties negotiate ROFR (right of first refusal), co-sale rights, board composition, non-compete clauses, and deadlock resolution. In venture-backed companies, many provisions live instead in investors’ rights, voting, and ROFR/co-sale agreements—but early-stage startups and LLCs often use a unified stockholder agreement before institutional rounds.

Amendments usually need specified supermajorities; one holdout can block changes.

Why it matters

• Founders: Read transfer restrictions before promising secondary liquidity to employees.
• Investors: The agreement enforces who can block a sale and what information rights you have pre-board seat.

Common mistake

Assuming the charter is the only governing document. Side agreements often control day-to-day shareholder behavior.

Related ideas

Shareholders agreement, ROFR, voting agreement, and investors’ rights agreement.

When you will see it

Early cofounder teams sign stockholder agreements before institutional money arrives, setting ROFR and transfer rules among founders.

Questions to ask

• Does the agreement conflict with later investors’ rights documents?
• Who can block a sale or secondary under ROFR?
• How are deadlocks resolved if cofounders disagree?

Practical takeaway

Treat stockholder agreement as something to define precisely in writing—not assume everyone in the room shares the same meaning. In term sheets, board decks, and LP updates, tie the concept to a concrete decision: a vote, a price input, a fund policy, or a metric formula. When definitions drift, teams misprice risk, miss leverage, or waste cycles on the wrong conversation.