Full ratchet versus weighted average anti-dilution, on a real cap table

Anti-dilution clauses read the same in almost every Indian term sheet: a promise that if the company raises a future round at a lower price, the existing investor’s conversion price adjusts. What differs, and what decides how much of the company founders keep after a down round, is which of two formulas that adjustment follows. Full ratchet and weighted average produce wildly different outcomes from the identical facts. Most articles on this topic explain the difference with algebra and stop before showing what the algebra does to an actual shareholding. This article builds one cap table, runs both formulas against it, and shows the exact share count each method hands to the earlier investor, and the exact percentage it takes from founders and the ESOP pool to pay for it.

What is the difference between full ratchet and weighted average anti-dilution

Full ratchet resets an investor’s conversion price to match the exact price of the new, lower-priced round, regardless of how many shares are issued at that price. Weighted average adjusts the conversion price by a formula that accounts for both the lower price and the number of shares issued at it, producing a smaller, proportionate adjustment. On an identical down round, full ratchet routinely hands an early investor five to six times more additional shares than weighted average would, and every one of those shares comes out of founders, ESOP holders, and the new investor’s stake.

How full ratchet anti-dilution works on paper

Full ratchet says: whatever the lowest price in any subsequent round turns out to be, that becomes the investor’s new conversion price, in full, immediately. It does not matter if the down round issues one share or ten lakh shares at that price. A single rupee of pricing below the investor’s original conversion price triggers a complete reset.

This is why full ratchet is described as a red flag rather than a routine protection. It decouples the investor’s protection from the actual severity of the down round. A small bridge priced defensively low can trigger the same reset as a genuine collapse in valuation. The larger institutional VC funds active in India rarely ask for it at seed or Series A. Where Treelife has seen it appear, it tends to be in distressed bridge financings or where one investor is effectively underwriting the company’s survival alone and has the leverage to ask for maximum protection.

Full ratchet is not automatically wrong for every deal. It tends to be defensible, rather than merely tolerated, in three specific situations, and a founder negotiating against it should know which one is actually in front of them:

• Insider-only restructurings. Where the existing investor base is the same group funding the down round, and no new outside investor’s incentives are at stake, a full ratchet mostly reallocates value within a group that has already agreed to the reallocation. It is still worth modelling, but it is not the same red flag as an outside investor extracting it.
• A bridge that will be taken out shortly by a priced round. If the bridge is genuinely short-dated and expected to convert or be superseded within months, the practical window in which a full ratchet actually bites is narrow, and the negotiating energy is often better spent on the bridge’s conversion mechanics than on the anti-dilution formula itself.
• A single investor funding the company’s entire path forward. Where one fund is providing effectively all the capital the company needs to reach its next milestone, that fund’s leverage to ask for full ratchet is real, and the founder’s realistic alternative is not a better anti-dilution clause but a different investor.

Outside these three situations, an outside investor asking for full ratchet at a normal priced round, with other investors in the syndicate on weighted average, is the scenario that deserves the red-flag treatment described above.

The damage from full ratchet is not confined to the round that triggers it. Once an early investor’s stake has been reset through full ratchet, the resulting cap table carries a visibly larger block for that investor and a visibly smaller one for founders and the ESOP pool than the round size alone would suggest. A new investor evaluating the next round reads that cap table before they read anything else, and an oversized early stake sitting on a full ratchet right reads as a company that has already been through a difficult repricing once and could be again. This is why full ratchet clauses are so often renegotiated or waived at the next financing rather than left in place: not out of goodwill, but because an unresolved full ratchet position makes the next round harder to close on clean terms, for the incoming investor as much as for the founders.

How weighted average anti-dilution works on paper

Weighted average takes a blended view. It asks: given the size of the new, lower-priced round relative to everything already outstanding, what conversion price fairly compensates the earlier investor without fully erasing the effect of the down round. The standard formula is:

New conversion price = Old conversion price × (A + B) / (A + C)

Where A is the fully diluted shares outstanding immediately before the new issue, B is the number of shares the new investment would have bought at the old conversion price, and C is the number of shares actually issued at the new, lower price.

This formula has been reproduced correctly in dozens of articles, including Treelife’s own term sheet guide, which walks through a single-investor version of this calculation. For a broader overview of anti-dilution as a concept, including trigger events and negotiation dynamics beyond the two core formulas, see Treelife’s primer on anti-dilution provisions. What none of these show on their own is what A actually contains on a real cap table, because A is where the entire broad-based versus narrow-based argument lives, and that argument only means something once there are real numbers in every bucket.

A caveat the formula alone does not surface: the calculation can be circular. B in the formula depends on the new money raised divided by the old conversion price, and C depends on the actual number of shares issued at the new price. If the anti-dilution adjustment itself changes how many total shares are outstanding immediately after the round, and the round’s own per-share price was set with reference to a target post-money percentage for the new investor, then the new investor’s share count and the seed investor’s adjusted share count can each depend on the other. In practice, term sheets sidestep this by fixing the new investor’s price and share count first, calculating the anti-dilution adjustment second, and treating the two as sequential rather than simultaneous. Where a deal is structured so the new investor’s percentage is meant to be locked after all adjustments, not before, the calculation needs an iterative solve rather than the single-pass formula above, and this is worth confirming explicitly with whoever is building the cap table model, since assuming a single pass when the deal intends a locked post-money percentage is a quiet source of cap table errors.

What anti-dilution formula should a founder actually trust before signing

A founder should trust the formula only after running it against their own fully diluted cap table, not a textbook example. The output depends entirely on what counts inside A: whether the ESOP pool, warrants, and convertible notes are included (broad-based) or excluded (narrow-based). On a real cap table with a meaningful ESOP pool, broad-based and narrow-based weighted average typically land within 1 to 2 percent of each other, while full ratchet lands 4 to 5 times further out.

A single worked cap table: founders, ESOP pool, seed CCPS, and a Series A down round

Take a fictional but realistic Indian SaaS company at Series A. The facts:

• Founders hold 70,00,000 equity shares
• An unallocated ESOP pool of 10,00,000 shares sits reserved but ungranted
• A seed investor holds 10,00,000 CCPS, issued at ₹40 per share, converting 1:1 into equity shares
• Fully diluted shares outstanding immediately before the new round: 90,00,000
• The company now raises a Series A down round: a new investor puts in ₹3,75,00,000 at ₹25 per share, a price below the seed investor’s ₹40 conversion price, issuing 15,00,000 new shares

This is the exact situation an anti-dilution clause exists for. The seed investor’s ₹40 conversion price is now above the price the company is actually able to raise at.

Post-seed cap table (before the Series A down round)

Holder	Shares	Fully diluted percentage
Founders	70,00,000	77.78%
ESOP pool (unallocated)	10,00,000	11.11%
Seed investor (CCPS, as-converted)	10,00,000	11.11%
Total	90,00,000	100.00%

Now run the Series A round three ways: with no anti-dilution adjustment as a baseline, with broad-based weighted average, and with full ratchet.

Scenario 1: No anti-dilution adjustment (baseline, for comparison only)

Seed CCPS converts at the original 1:1 ratio into 10,00,000 shares. The new investor’s 15,00,000 shares are added.

Holder	Shares	Fully diluted percentage
Founders	70,00,000	66.67%
ESOP pool	10,00,000	9.52%
Seed investor	10,00,000	9.52%
Series A investor	15,00,000	14.29%
Total	1,05,00,000	100.00%

This is the dilution every round causes anyway, before anti-dilution enters the picture. Founders drop from 77.78% to 66.67% purely from a new investor coming in. This baseline matters because it isolates what anti-dilution costs founders on top of ordinary round dilution, which is the number that actually matters in a negotiation.

Scenario 2: Broad-based weighted average

A (fully diluted shares before the new issue, including the ESOP pool) = 90,00,000 B (shares the new money would have bought at the old ₹40 price) = ₹3,75,00,000 ÷ 40 = 9,37,500 C (shares actually issued at ₹25) = 15,00,000

New conversion price = 40 × (90,00,000 + 9,37,500) ÷ (90,00,000 + 15,00,000) = 40 × 99,37,500 ÷ 1,05,00,000 = ₹37.86

Conversion ratio = 40 ÷ 37.86 = 1.0565. The seed investor’s 10,00,000 CCPS now convert into approximately 10,56,500 equity shares, an increase of 56,500 shares over the no-adjustment baseline.

Holder	Shares	Fully diluted percentage
Founders	70,00,000	66.31%
ESOP pool	10,00,000	9.47%
Seed investor	10,56,500	10.01%
Series A investor	15,00,000	14.21%
Total	1,05,56,500	100.00%

Founders lose 0.36 percentage points to the anti-dilution mechanism itself, on top of the ordinary round dilution already counted in Scenario 1.

Scenario 3: Full ratchet

The seed investor’s conversion price resets outright to ₹25, the Series A price, regardless of round size. Conversion ratio = 40 ÷ 25 = 1.60. The seed investor’s 10,00,000 CCPS convert into 16,00,000 equity shares, an increase of 6,00,000 shares over the no-adjustment baseline.

Holder	Shares	Fully diluted percentage
Founders	70,00,000	63.06%
ESOP pool	10,00,000	9.01%
Seed investor	16,00,000	14.41%
Series A investor	15,00,000	13.51%
Total	1,11,00,000	100.00%

Founders lose 3.61 percentage points to the anti-dilution mechanism alone, about ten times the cost of weighted average on the identical round. In absolute terms, full ratchet hands the seed investor 5,43,500 more shares than weighted average would, on the same investment, the same down round, the same day.

Why broad-based versus narrow-based matters less than founders are told

Run the same round with a narrow-based weighted average formula, which excludes the ESOP pool from A.

A (narrow, excluding the ESOP pool) = 70,00,000 + 10,00,000 = 80,00,000 B = 9,37,500 (unchanged) C = 15,00,000 (unchanged)

New conversion price = 40 × (80,00,000 + 9,37,500) ÷ (80,00,000 + 15,00,000) = 40 × 89,37,500 ÷ 95,00,000 = ₹37.63

Conversion ratio = 40 ÷ 37.63 = 1.0632. The seed investor converts into approximately 10,63,200 shares, only about 6,700 shares more than the broad-based result of 10,56,500.

On this cap table, broad-based and narrow-based weighted average differ by roughly 0.06 percent of the fully diluted total. Full ratchet differs from either by roughly 5 percent. Founders are frequently coached to fight hard over broad-based versus narrow-based drafting, and it is a fight worth having on principle, but on a moderate down round with a normal-sized ESOP pool, it is a rounding argument next to the ratchet-versus-weighted-average argument. The distinction widens only when the ESOP pool is unusually large relative to the base, or the down round is severe enough that B and C diverge sharply. Negotiating capital should go first to keeping the mechanism as weighted average at all, then to the broad-based versus narrow-based drafting, in that order of priority.

What happens to the ESOP pool, the detail most explainers skip

Every anti-dilution comparison online talks about the effect on founders and investors. The ESOP pool dilutes on exactly the same fully diluted basis, and almost nobody models it. In the worked cap table above, the ESOP pool’s fully diluted percentage drops from 11.11% before the round to 9.47% under weighted average and to 9.01% under full ratchet. That difference of 0.46 percentage points is not abstract. On a company that eventually exits at a meaningful valuation, that is the difference between the option pool being able to fund a strong senior hire’s grant later in the company’s life and it running short. Founders modelling anti-dilution should always run the ESOP pool’s post-adjustment percentage alongside their own, not after.

The Companies Act, 2013 and FEMA mechanics of implementing the adjustment

Adjusting a conversion ratio on paper and actually implementing it are two different exercises under Indian law.

For a domestic seed investor, the SHA-defined anti-dilution formula operates as a contractual adjustment to the conversion ratio of the CCPS already allotted. No fresh share issuance or pricing exercise is required at the point the formula is triggered, only at the point of actual conversion, when the additional equity shares are issued under Section 62(1)(c) of the Companies Act, 2013 as part of a preferential allotment, requiring board approval and, depending on the company’s articles, a special resolution.

For a foreign seed investor, the position carries one additional layer. Under the Foreign Exchange Management (Non-Debt Instruments) Rules, 2019, any equity instrument issued to a non-resident must carry a price or a pricing formula fixed at the time of original issuance, and CCPS pricing formulas built around a weighted average or full ratchet mechanism satisfy this because the formula, not an open-ended discretion, was fixed upfront and certified by the valuer at issuance. What does require fresh compliance is the conversion event itself: when the CCPS actually convert into the adjusted number of equity shares, a fresh Form FC-GPR must be filed with the Reserve Bank of India within the prescribed timeline, reflecting the revised, anti-dilution-adjusted share count, not the originally contemplated 1:1 figure. Companies that treat the anti-dilution adjustment as a purely internal cap table exercise and skip the fresh FC-GPR filing at conversion carry a compounding compliance gap that surfaces, usually at the worst time, during the next round’s due diligence.

Common mistakes that cost founders time and money

Mistake 1: Modelling anti-dilution off the textbook formula instead of the company’s actual cap table. The formula is correct but useless without the real A, B, and C. Founders who accept a term sheet’s anti-dilution clause without running their own numbers are agreeing to an outcome they have not actually seen.

Mistake 2: Treating full ratchet and weighted average as a minor drafting difference. As the worked example shows, the two produce a roughly tenfold difference in what the mechanism costs founders on an identical round. This is not a clause to leave to the lawyers to standardise; it belongs on the founder’s own negotiation checklist.

Mistake 3: Forgetting the ESOP pool dilutes on the same basis as founders. Every percentage point lost to an anti-dilution adjustment comes proportionately out of the ESOP pool too, which affects the company’s ability to make competitive senior hires in later rounds.

Mistake 4: Assuming the anti-dilution adjustment is self-executing with no compliance follow-through. For foreign investors, a fresh Form FC-GPR is required at the point of conversion reflecting the adjusted share count. Skipping this creates an FEMA reporting gap that surfaces at the next round’s due diligence.

Mistake 5: Negotiating broad-based versus narrow-based before confirming the mechanism is weighted average at all. As shown above, on a normal-sized ESOP pool the broad-versus-narrow argument is worth a fraction of a percentage point. Spending negotiating capital there while conceding full ratchet is negotiating the wrong clause first.

Practitioner note

In the anti-dilution negotiations Treelife has run alongside founders at Series A and Series B, the pattern that repeats is not that founders lose the ratchet-versus-weighted-average argument outright. Most institutional Indian investors will concede to broad-based weighted average without much resistance, because it is genuinely market standard and most standard-form term sheet templates used in Indian rounds default to it. Where founders lose ground is in not running the actual numbers before the negotiation starts, so they walk into the conversation unable to tell an investor what a specific clause will cost them in shares. A founder who arrives with the worked cap table, the way this article builds one, changes the tenor of the conversation from a philosophical debate about fairness to a specific number both sides can check. We have also seen the FEMA compliance step at conversion missed more often than the anti-dilution clause itself is negotiated badly, under Section 62(1)(c) of the Companies Act, 2013 read with the FEMA (Non-Debt Instruments) Rules, 2019, because the adjustment happens quietly inside a cap table spreadsheet years after the term sheet was signed, by which point the founder who negotiated the original clause may no longer be the one tracking compliance.

Case study

Situation: A Bengaluru-based B2B SaaS company at Series A, having raised a ₹4 crore seed round eighteen months earlier, faced a slower-than-expected growth curve and was negotiating a Series A term sheet at a valuation below the seed round’s implied price.

Challenge: The seed investor’s term sheet carried broad-based weighted average anti-dilution, but the founders had never modelled what it would actually cost them in shares, and the incoming Series A lead was separately proposing an ESOP pool top-up in the same round, compounding the dilution question.

What Treelife did: Built a full cap table model running the weighted average formula against the actual fully diluted base, isolated the anti-dilution cost from the ordinary round dilution and the ESOP top-up, and produced a single sheet the founders could use in the negotiation to separate three distinct asks: the anti-dilution adjustment, the new ESOP allocation, and the new investor’s ownership target.

Outcome: The founders retained the weighted average mechanism as drafted, negotiated the ESOP top-up down by 2 percentage points once it was shown separately from the anti-dilution number, and closed the round with a documented model the company continues to use for every subsequent round’s dilution planning.

FAQ’s on full ratchet and weighted average anti-dilution

Q: What is the main difference between full ratchet and weighted average anti-dilution?
A: Full ratchet resets the investor’s conversion price to match the new round’s price entirely, regardless of round size. Weighted average adjusts it proportionately, based on both the price and the size of the new round. On an identical down round, full ratchet typically costs founders several times more in shares than weighted average.

Q: Is anti-dilution protection legally required in Indian term sheets?
A: No. No provision of the Companies Act, 2013 or FEMA mandates anti-dilution protection. It is a negotiated contractual right recorded in the shareholders’ agreement and the CCPS terms, not a statutory entitlement.

Q: How is anti-dilution taxed for the investor receiving additional shares?
A: This is an evolving area and the position below should be verified against the Income Tax Department’s current guidance before relying on it for a specific transaction. On the general principle, the additional equity shares issued on conversion are not commonly treated as a separate taxable event for the investor at the point of the ratio adjustment itself, since the underlying CCPS were already taxed, if at all, at issuance. Capital gains exposure would ordinarily arise later, at the point the investor eventually transfers the resulting equity shares. Founders and investors should confirm the current position with a tax advisor before treating this as settled, since it has not been tested extensively against Indian case law specific to anti-dilution adjustments.

Q: What fees are typically involved in modelling or negotiating an anti-dilution clause?
A: Cap table modelling and term sheet negotiation support are usually billed as part of a fundraise advisory engagement, either as a fixed fee for the round or as part of an ongoing VCFO retainer, rather than a standalone anti-dilution-specific fee.

Q: How long does it take to model an anti-dilution scenario before signing a term sheet?
A: With an accurate, up-to-date cap table already in hand, running full ratchet and weighted average scenarios against a proposed round typically takes one to two working days. Without a clean existing cap table, expect an additional three to five days to reconstruct one first.

Q: What documents does a founder need to model anti-dilution correctly?
A: The current fully diluted cap table, the CCPS or CCD terms from the prior round’s SHA and SSA (specifically the original conversion price and the anti-dilution formula language), and the proposed new round’s price and size from the incoming term sheet.

Q: Does anti-dilution apply to foreign investors differently?
A: The formula itself is the same. The compliance mechanics differ: a foreign investor’s CCPS pricing formula must have been fixed at issuance under the FEMA (Non-Debt Instruments) Rules, 2019, and the eventual conversion into an adjusted equity share count requires a fresh Form FC-GPR filing with the Reserve Bank of India reflecting the revised numbers.

Q: How should founders structure anti-dilution when co-founders hold shares through a family trust or HUF?
A: The anti-dilution mechanism itself does not distinguish between individual, trust, or HUF-held shares; dilution flows proportionately regardless of holding structure. What matters is ensuring the trust or HUF’s shareholding is correctly captured in the fully diluted base (A in the formula) so the adjustment is calculated against accurate numbers.

Q: Does DPIIT-recognised startup status change how anti-dilution is treated?
A: No. DPIIT recognition affects tax exemptions and certain compliance simplifications; it has no bearing on anti-dilution mechanics, which are purely a matter of contractual drafting in the SHA and CCPS terms.

Q: What happens to anti-dilution rights if the Series A round falls through after the term sheet is signed?
A: Anti-dilution adjustments trigger only on an actual, completed issuance of shares at a lower price, evidenced by board and shareholder approvals and an allotment. A term sheet that does not convert into a closed round triggers nothing, since no new shares are ever actually issued.

Q: How does full ratchet affect a new investor coming into the down round?
A: A new investor effectively inherits a smaller slice of the company than the headline round size suggests, because the earlier investor’s ratchet-driven share increase dilutes everyone, including the new investor, on a fully diluted basis. Sophisticated new investors often require the earlier investor to waive or convert a full ratchet right as a closing condition for exactly this reason.

Q: Can anti-dilution rights be waived or renegotiated in a later round?
A: Yes, and this is common practice. A new lead investor in a down round frequently makes waiving or converting an existing full ratchet right into weighted average a condition of closing, since an unaddressed full ratchet can make the resulting cap table unworkable for future fundraising.

Q: Do ESOP option holders get any anti-dilution protection of their own?
A: No. ESOP holders have no contractual anti-dilution right. The unallocated ESOP pool dilutes proportionately along with founders whenever an anti-dilution adjustment increases an investor’s share count, as shown in the worked cap table above.

Q: What is the practical negotiating priority if an investor insists on full ratchet?
A: Push first for a sunset clause that converts the full ratchet into weighted average after a defined period or a subsequent qualifying round, and second for a cap on the maximum additional shares issuable under the ratchet, rather than accepting an open-ended full ratchet with no limiting mechanism.

Regulatory references

• Section 62(1)(c), Companies Act, 2013 (preferential allotment of shares)
• Section 55, Companies Act, 2013 (conversion and redemption of preference shares)
• Foreign Exchange Management (Non-Debt Instruments) Rules, 2019 (pricing of instruments issued to non-resident investors)
• Form FC-GPR reporting requirement under FEMA, Reserve Bank of India

External sources

• Ministry of Corporate Affairs
• Reserve Bank of India
• Startup India