A top-up round is supplemental financing from existing investors into a company already in their portfolio, typically structured as an extension of the prior round or a small insider-led priced round.

How it works

Scenarios include: lead fund exercises pro rata and brings co-investors to fill a round without a monthslong process; company needs six months runway before metrics support an up round; or insiders pre-empt external interest with more capital at negotiated terms. Top-ups may be labeled “extension,” “insider round,” or “internal round” on cap tables.

Terms range from flat prior valuation to modest markup or down round depending on performance. Speed is the advantage — fewer new parties, lighter diligence. Disadvantage: no fresh price discovery or new strategic value from a lead.

Distinction from bridge round: bridges often use notes or SAFEs; top-ups may be full preferred issuances at defined prices.

Why it matters

• Founders: Top-ups buy time but can cap valuation if insiders price conservatively. Negotiate whether the round is marketed externally or kept internal.
• Investors: GPs top-up winners to maintain ownership and support milestones; repeated top-ups without outsider leads may trigger write-down discussions.

Common mistake

Framing a down-round top-up as a “strategic extension” without updating 409A, employee option morale, and external narrative. Transparency prevents rumor-driven attrition.

Related ideas

See also bridge round, up round, pro rata rights, and insider round.