Founders signing a VC
/PE term sheet often wave through the anti-dilution clause as boilerplate, not realizing it can silently shift control of the company to the investor at the next financing round — especially if that round prices lower than the last one (a down round). The mechanism looks like a standard investor protection, but the difference between a broad-based weighted average formula and a full ratchet formula can mean the difference between losing a few percentage points of ownership and losing effective control of the board and future fundraising leverage. Vietnamese law layers a separate, mandatory pre-emptive right on top of whatever the term sheet says, and founders who do not map the two together routinely under-negotiate. This article sets out the five points a founder must understand before signing: how the anti-dilution formulas actually work, what Vietnamese company law independently guarantees existing shareholders, where anti-dilution shades into a broader protective-provisions veto, how to negotiate a workable middle ground, and the open verification points founders should raise with counsel before signing.
1. Full Ratchet vs. Weighted Average: What Actually Happens at the Negotiating Table
Anti-dilution protection resets the conversion price of an investor’s preferred shares when the company issues new shares at a lower price than the investor originally paid. Full ratchet resets the investor’s conversion price to match the new, lower issue price outright — the most founder-hostile version, since it ignores how many new shares were actually issued relative to the company’s existing capitalization. Broad-based weighted average (the market-standard formula in most VC deals globally) instead recalculates the conversion price using a formula that weighs the size of the new issuance against the company’s fully diluted share count, so the adjustment is proportionate to the actual dilution event rather than a blunt reset.
| Issue or option | Mechanism | Founder impact | Risk | Mitigation |
|---|---|---|---|---|
| Full ratchet | Conversion price resets to new issue price regardless of round size | Severe — a small down round can wipe out a large share of founder/common equity | High | Resist in term sheet negotiation; accept only with a sunset clause and carve-outs for employee pool top-ups |
| Broad-based weighted average | Adjustment proportionate to new shares issued vs. fully diluted base | Moderate — dilution shared more evenly among existing holders | Medium | Confirm the formula uses “fully diluted” (not “issued and outstanding”) share count as the denominator |
| Narrow-based weighted average | Same formula, smaller denominator (excludes option pool/warrants) | Higher than broad-based, lower than full ratchet | Medium-High | Push for broad-based definition; quantify the delta in a cap-table model before signing |
The formula choice is negotiable, and in practice most institutional VC/PE funds active in Vietnam will accept broad-based weighted average as the market standard — full ratchet is a red flag that should trigger heightened scrutiny of the fund’s overall term sheet posture, not just this one clause.
2. The Pre-Emptive Right Vietnamese Company Law Already Gives You
Independent of whatever the term sheet negotiates, Vietnamese law provides a baseline protection for existing shareholders of a non-public joint-stock company: under Article 125.2 of the 2020 Law on Enterprises (Law No. 59/2020/QH14), when the company offers new shares to persons other than all existing shareholders, existing shareholders generally have a pre-emptive right to subscribe for new shares in proportion to their existing holding, exercised by written notice within a set period, and that right is itself transferable. This is a statutory floor, not a contractual anti-dilution mechanism — it does not adjust conversion prices or protect against a down round’s pricing impact, but it does give a founder (or any existing shareholder) a real, exercisable option to participate in the new round and limit dilution by actually buying in, rather than relying solely on the investor’s contractual formula. [State Authority Practice / Verification Required: a 2025 package of Enterprise Law amendments (Law No. 76/2025/QH15, effective 1 July 2025) revised several provisions of the 2020 Law on Enterprises; whether the pre-emption rule was renumbered or substantively amended should be confirmed against the current consolidated text before this citation is relied on in a live negotiation.] For a limited liability company, an analogous pre-emptive right applies to existing members in proportion to their capital contribution when the company increases charter capital, subject to the company’s charter and the same category of statutory exceptions.
3. Where Anti-Dilution Protection Shades Into a Control Veto
Anti-dilution is typically bundled with a broader set of Protective Provisions — investor veto rights over specified company actions, commonly including future share issuances, amendments to the charter, changes to the board composition, related-party transactions, and incurring debt above a threshold. Founders should treat the anti-dilution formula and the protective-provisions list as a single negotiation, not two separate clauses, because a narrow anti-dilution formula loses much of its founder-protective value if the same investor holds an unconditional veto over every future financing the company might need to cure a down round.
| Issue or option | Legal position | Commercial impact | Risk | Mitigation |
|---|---|---|---|---|
| Broad protective-provisions list with low thresholds | Contractual veto under the Shareholders’ Agreement/Investment Agreement, not a statutory right | Investor can block or delay future fundraising, even on favorable terms | High | Negotiate materiality thresholds (e.g., issuances below a defined amount excluded) and sunset the veto after a defined milestone or ownership floor |
| Anti-dilution without a pool carve-out | Employee option pool top-ups can trigger unintended anti-dilution adjustments | Founder equity erodes further than the down round itself would justify | Medium | Expressly exclude approved option pool issuances from the anti-dilution calculation |
4. Negotiating to Keep Control While Still Closing the Round
A founder rarely has leverage to reject anti-dilution protection outright — most institutional funds active in the Vietnamese market will not close without some version of it. The realistic negotiation is over mechanism and scope: push for broad-based weighted average over full ratchet, insist on a fully diluted (not narrow) denominator, carve out approved employee pool issuances and down rounds tied to a pre-agreed strategic milestone (such as a bridge round before an already-planned Series B), and pair any protective-provisions veto with objective thresholds rather than open-ended discretion. Where the fund insists on full ratchet, a workable fallback is a pay-to-play provision, which conditions the investor’s continued anti-dilution protection on that investor actually participating pro rata in the down round — if the fund declines to invest further, its preferred shares (and the ratchet benefit) convert to common on less favorable terms. [Hypothetical scenario, for illustration only: a Series A investor holding full ratchet anti-dilution declines to participate in a Series B priced 30% below Series A; a pay-to-play clause would convert that investor’s shares to common, capping the ratchet-driven dilution to the founder.]
Frequently Asked Questions
Is anti-dilution protection mandatory under Vietnamese law? No. Anti-dilution is a contractual mechanism agreed in the Investment Agreement/Shareholders’ Agreement, not a default statutory obligation. The law only guarantees existing shareholders a pre-emptive right to subscribe for new shares (Article 125, 2020 Law on Enterprises) — a separate protection, independent of any anti-dilution formula. Can a founder refuse anti-dilution protection entirely? In theory yes, but in practice most serious VC/PE funds will not invest without some version of this protection. The more realistic negotiation is over the type of mechanism (weighted average rather than full ratchet) and its scope and duration. What is pay-to-play and does it work in the Vietnamese market? Pay-to-play requires an existing investor to keep participating pro rata in future rounds to retain anti-dilution and other preferred rights; if the investor sits out, its preferred shares may convert to common on less favorable terms. It is negotiable and increasingly used as a founder-side counterweight to full ratchet terms, though it is not a standardized market term in every deal. Does the statutory pre-emptive right protect against price dilution in a down round? Not directly. It gives existing shareholders the option to buy new shares proportionally, which can offset dilution if exercised, but it does not adjust conversion prices or otherwise compensate for a lower valuation the way a contractual anti-dilution formula does. IVLF advises founders and cap-table holders on reviewing and negotiating VC/PE term sheets, anti-dilution and protective-provisions drafting, and structuring pay-to-play and pre-emptive-right mechanics ahead of signing. Contact IVLF to have your term sheet reviewed before you sign. This article provides general legal information for business planning purposes and does not constitute legal advice on any specific transaction. Founders should obtain matter-specific advice before signing a term sheet or investment agreement.
Additional Resources & Related Articles
For further international market practice, see National Venture Capital Association (NVCA) – Model Legal Documents.
Related reading: FX Risk and Governing Law in Cross-Border Credit Agreements and Drag-Along Clauses: Structuring Minimum Drag Price and Black-Out Period.
This article is provided for general information only and does not constitute legal advice for any specific case. Regulations may change – please consult a qualified professional before acting. Should further analysis be required, please contact one of our lawyers below.
