Most secondary buyers focus on the price-per-share. That is the wrong starting point. The number that matters first is the breakpoint — the exit value at which the share class you are buying finally participates in proceeds above its face value. Until the company clears that threshold, preferred shareholders take the first cut.
This article walks through how to build a basic breakpoint model using information that is either public or available from a careful read of the cap table summary and the company's most recent financing documents. You do not need a law degree or a spreadsheet PhD. You need to ask four questions in sequence.
Why liquidation preferences change the math so dramatically
When a venture-backed company raises a preferred round, investors typically receive a liquidation preference — a guaranteed first-dollar return on any exit event before common and option holders see anything. A 1x non-participating preference on a $500 million preferred stack means preferred holders collect up to $500 million first. Common sees nothing until total proceeds exceed that number.
Participating preferred is harder. Here, preferred investors collect their liquidation preference and then convert and share in the remaining proceeds alongside common. The breakpoint for common in a participating structure is not simply the total preference stack — it is a function of each class's participation rate and the conversion terms.
Secondary buyers who skip this step sometimes purchase common at an implied valuation that looks cheap relative to the last primary round, only to discover that the entire valuation uplift is absorbed by senior preferred. The per-share price they paid was not cheap — it was a mispricing of the capital structure.
The four questions that build your breakpoint model
1. What is the total liquidation preference stack?
Sum every preferred series — Seed, Series A through the most recent round — multiplied by its preference multiple (most commonly 1x, occasionally 1.5x or 2x for later tranches). This is the minimum exit value at which preferred holders are fully paid out before common participates at all. The company's most recent 409A valuation report or a secondary broker's cap table summary will usually list these figures.
2. Are any preferred shares participating or non-participating?
Non-participating preferred converts to common once the exit value clears the preference. At that point, all shareholders — former preferred and existing common — share pro-rata. Participating preferred keeps its preference and then converts, effectively double-dipping. In a participating structure, the breakpoint for common is higher because preferred investors extract value at two layers of the waterfall.
3. What is the fully diluted share count at each layer?
Option pools, warrants, restricted stock units, and secondary shares all dilute proceeds. A company might have 500 million shares outstanding on paper, but once you include unissued options and unvested grants, the true fully diluted count could be 20–30 percent higher. Your per-share proceeds shrink accordingly. Ask specifically for the fully diluted cap table, not just issued and outstanding.
4. At what exit multiples does each scenario actually happen?
Run three scenarios: a base case (exit at last primary valuation), a downside case (50 percent haircut), and an upside case (2–3x the last round). Calculate proceeds to your share class at each scenario. Then divide by your cost basis to get a return multiple. If the downside case produces zero return to common — because the preference stack absorbs all proceeds — you have quantified your real downside, which is not a price decline, it is a total wipeout.
A worked example with round numbers
Imagine a company last raised at a $10 billion post-money valuation. Preferred shares across all series carry a combined 1x non-participating liquidation preference totaling $2 billion. The fully diluted share count is 1 billion shares. Of those, 200 million are preferred shares; 800 million are common and options.
- Exit value must clear $2 billion before common participates.
- At a $5 billion exit, common shares split $3 billion (the remainder after preferred), or $3.75 per share.
- At a $10 billion exit, common shares split $8 billion, or $10 per share.
- At a $1.5 billion exit, common receives zero — preferred absorbs all proceeds.
If you purchased common at an implied $10 billion valuation (roughly $10 per share), your base-case return at a $10 billion exit is exactly breakeven. Your upside requires an exit meaningfully above $10 billion. Your downside is asymmetric: a $5 billion exit — still an impressive outcome in absolute terms — produces $3.75 per share against a $10.00 cost basis.
Now change one input: the preferred stack is participating rather than non-participating. Preferred investors now collect $2 billion first, then convert and own 20 percent of remaining proceeds. At a $10 billion exit, common splits 80 percent of $8 billion, or $6.40 per share — a 36 percent shortfall against a $10 breakeven price. The participating feature alone destroyed more than a third of your expected return.
Where to find the inputs
Secondary buyers rarely have access to a company's full charter. That is a structural reality of private markets. But several proxy sources exist, and combining them gives you a working model rather than a guess.
- SEC Form D filings: disclose aggregate offering amount per series, which roughly tracks the liquidation preference per tranche for standard 1x deals.
- 409A valuation summaries: reputable secondary platforms often share the most recent 409A conclusion, which in turn references share classes and their seniority.
- News coverage of funding rounds: reported post-money valuations and round sizes let you estimate per-series preference stacks from the outside.
- Cap table summaries from the selling broker: a responsible counterparty will disclose at least the seniority ranking and preference multiple for each series.
If a seller or platform is unwilling to confirm even the basic structure of the liquidation stack, that is itself a data point worth weighing.
How this changes what you pay
A properly run breakpoint analysis does not necessarily stop you from buying. It calibrates the price you should pay. If your model shows that common shares need a 3x exit to return 1.5x to you, you should discount your bid relative to the last primary round — not match it. The secondary market exists precisely because some holders need liquidity at a price that reflects structural risk. Informed buyers price that risk explicitly.
We provide cap table summaries and the most recent 409A reference mark for every listing on the platform. Before you submit an indication on the marketplace, use those inputs to run even a rough version of the model above. Fifteen minutes of arithmetic has averted more costly mispricing decisions than any amount of macro research.
Explore current listings and download available cap table summaries on the marketplace, or read our companion piece on preferred versus common secondary economics before you build your model.