Carta vs Shareworks for a Growing B2B SaaS Cap Table

For a private SaaS company managing option grants, exercises, and 409A refreshes across a single US entity, Carta's workflow can be the more direct path: cap table changes, board consent, and valuation ordering live close together, and many investors are already familiar with Carta reports. If your equity plan is still mostly options with a straightforward vesting schedule, this is the lower-friction choice.

That familiarity also shortens diligence. When a new investor joins your board or a strategic acquirer's finance team starts poking at your equity history, not having to explain an unfamiliar platform's report format is a small but real time saver during an already busy process.

Once a SaaS company is granting RSUs, running an employee stock purchase plan, or paying a workforce spread across a dozen countries with different tax withholding rules, the calculus changes. Shareworks was built for exactly that administrative load: multi-jurisdiction tax reporting, broker integration for post-IPO liquidity, and the kind of plan complexity that shows up once equity compensation is a material line item on the income statement, not just a founder's promise. Companies that plan an IPO within a few years often start this migration early rather than doing it under deadline pressure.

The practical reason to move early rather than late is data quality. A cap table that's been through several years of option grants, secondary sales, and early exercises accumulates edge cases, and untangling those records during an active S-1 process is far more expensive than migrating them while the company is still private and the stakes of a data error are lower.

A pure option pool is simple to price and simple to administer. The moment a company layers in RSUs for senior hires, or launches an ESPP to compete on total compensation, the reporting burden multiplies: RSU vesting triggers ordinary income at a different moment than an option exercise does, and an ESPP has its own valuation and disclosure requirements. Ask which platform your payroll and equity teams will actually be entering data into every pay cycle, not just at grant time, before you commit.

A common misstep is layering RSUs onto a platform that was only ever configured to handle options, then discovering at the first vesting event that tax withholding isn't calculating correctly for a handful of employees in states with unusual supplemental wage rules. Test the full grant-to-vest-to-tax-withholding cycle with a small group before rolling a new instrument type out company-wide.

The pace of this decision often tracks the pace of the business. For companies in the one million to three million dollar ARR band, private B2B SaaS growth typically runs around a 28 percent median year over year, with faster companies well above that¹. A company growing near the top of its band is usually raising, hiring, and granting equity often enough that plan complexity arrives sooner than founders expect, which argues for evaluating Shareworks earlier rather than waiting for an S-1 to force the question.

If your cap table is still mostly options, one entity, and a board that already reads Carta, stay put and revisit the question when RSUs or international hiring show up. If you're already administering RSUs, an ESPP, or payroll across several countries, start evaluating Shareworks now rather than mid-migration during a live grant season.

Whoever leads finance should own this decision jointly with people operations, not finance alone, since the administrative burden of a growing equity plan lands as much on whoever runs payroll and benefits as it does on whoever tracks the cap table. A platform choice made without that team in the room tends to get revisited within a year anyway.

Signs it is time to evaluate Shareworks:

• You already grant RSUs alongside options, which changes when income is recognized and multiplies reporting.
• You run or plan an employee stock purchase plan to compete on total compensation.
• You pay employees across several countries with different tax withholding rules.
• Your finance team is starting to plan what equity plan administration looks like after an IPO.