What's the best way to keep a single source of truth for equity ownership?

The best way to keep a single source of truth for equity ownership is to run every equity change through one platform, tie every update to a signed document, and eliminate any shadow system that creates a second version of your cap table. When those conditions are met, your cap table is always accurate by design, not by effort.

Equity ownership is one of the few things in a startup where being approximately right is not good enough. A cap table that is 95% accurate is a cap table with errors, and errors at a funding round or acquisition create delays, legal fees, and exactly the kind of investor conversation you do not want to have.

Why cap tables diverge: the three most common failure modes

Failure mode 1: a spreadsheet running alongside the platform.

This is the most common problem and usually starts with good intentions. Someone wants a quick summary for a board meeting, so they export the data into a spreadsheet and make a few calculations. That spreadsheet gets saved, shared, updated. A few months later, there are two versions of your equity ownership: the one in your platform and the one in the spreadsheet, and they no longer match. The divergence compounds every time someone makes a change in one place and forgets to update the other.

Failure mode 2: changes recorded without signed documents.

A founder agrees to give an early employee a grant during a conversation. It goes into the cap table right away because the intention is clear. The option agreement gets drafted, reviewed, and then sits in someone's email as a PDF that never quite gets signed.

Six months later, the cap table shows a grant with no signed document behind it. For an investor doing due diligence, it is a red flag, and in some cases creates legal ambiguity about whether the grant is valid at all.

Failure mode 3: investor updates sent from a separate file.

Quarterly investor updates often include a cap table summary. Many founders build this manually, pulling numbers from their platform and formatting into a slide or email. When an investor references that file and the numbers have since changed, you are in a conversation explaining why two documents from the same company show different ownership percentages. A small problem with an outsized confidence impact.

The single source of truth principle

The failure modes above happen because each deviation feels harmless in the moment. The spreadsheet is just for a meeting. The grant will get signed soon. The investor update is close enough.

The discipline required is not technical; it is behavioural. Every equity event, whether a new grant, an exercise, a transfer, a cancellation, or a round close, should happen in one place, in the right sequence, with the documentation locked before the cap table updates. When that sequence is enforced consistently, divergence becomes structurally impossible.

The secondary benefit is speed. When your cap table is always accurate, you stop second-guessing it. Due diligence becomes a question of sharing access rather than validating numbers.

What "good" looks like: a concrete checklist

A cap table that qualifies as a genuine single source of truth has four properties.

One database. All equity, across all stakeholders, all share classes, all grant types, lives in one system. There is no equity-related information stored anywhere else that is not fully derived from this system.

Linked documents. Every grant, transfer, exercise, or round is linked to the signed legal document that authorises it. If a document is missing or unsigned, the system flags it rather than silently accepting the change.

Full audit trail. Every change to the cap table is logged: who made it, when, and what the before and after state was. This is how you catch and correct errors before they compound.

Instant fully diluted view. At any moment, you can generate the fully diluted ownership table, including all options, warrants, convertible notes, and SAFEs, without doing any manual calculation. The number is current as of right now, not as of the last time someone ran an export.

If your current setup cannot produce all four of these on demand, you do not yet have a single source of truth.

How Cake enforces this by default

Cake is designed so that the single source of truth state is not something you have to achieve through discipline; it is the only way the platform works.

All four properties from the checklist above are enforced structurally. The cap table does not update until an option agreement is executed, so linked documents are never optional. The audit log captures every change automatically, timestamped and attributed. The fully diluted view is always live, factoring in every outstanding instrument. And because investors and employees access equity information through the Cake stakeholder portal, there is no separate file to maintain for external updates.

That is what a single source of truth actually means in practice: not a principle you try to uphold, but infrastructure that makes any other state impossible.