Carta vs Forge For A B2B Marketplace's Own Cap Table

Marketplace businesses often report growth in terms of gross merchandise value rather than a SaaS company's ARR, and institutional buyers evaluating a Forge-sourced transaction will want to understand take rate, transaction volume durability and network effects rather than a straightforward subscription growth number. Prepare a clear translation of your metrics into terms a non-marketplace-native buyer will actually understand before opening any diligence process. A one-page glossary mapping your internal metrics to their closest SaaS equivalents is a small effort that saves real time once diligence questions start arriving.

This is worth checking with real data rather than assuming the answer, since the gap between perception and reality can cut either way. Marketplace valuations can move more sharply than steady subscription businesses, since network effects create winner-take-most dynamics that make growth deceleration or a competitive threat weigh more heavily on perceived value. If your valuation has been volatile, expect that to show up directly in any Forge-sourced pricing discussion, and consider whether a smaller, internally funded Carta program avoids locking in a price during a temporary down period. Plot your last several quarters of valuation estimates against your GMV growth rate before deciding whether now is even a reasonable time to price a transaction at all.

Marketplace metrics like take rate, supplier concentration and buyer retention are often more strategically sensitive than a typical SaaS metric, since a competing marketplace could use them directly to undercut pricing or target your best suppliers. Weigh this carefully before opening a Forge-sourced diligence process, and consider whether Carta's fully internal route better protects that specific kind of competitive information. Ask your head of supply and your head of demand generation both what they would least want a competitor to see, since the two sides of a marketplace often have different sensitivities.

Unlike a typical B2B company, a marketplace has both supply-side and demand-side participants who may notice and react to an ownership change, particularly if a new institutional investor has stakes in other marketplaces those participants also use. Think through how a change in ownership reads to both sides of your marketplace, not just internally, before finalizing any transaction involving outside capital. Draft a short talking point for account teams on each side before the transaction is announced, so a supplier or buyer who asks gets a consistent answer rather than whatever the person on the call happens to improvise.

Weigh the answers to the four questions above together rather than in isolation, since a marketplace can score differently on each one and the combination matters more than any single factor. If your growth has been volatile, your metrics need real translation for a generalist buyer, and your competitive information is unusually sensitive, Carta's internal, treasury-funded route is likely the more comfortable starting point. If you have a genuine capital need, a more mature and stable metrics story, and confidence in explaining marketplace dynamics to institutional buyers, Forge's network can work well, provided you budget real time for buyer education as part of the process.

Weigh your answers to these four questions together:

• Can you explain gross merchandise value, take rate and transaction volume in terms an institutional buyer already understands?
• Have you checked with real data whether your valuation swings are larger than a typical subscription business's?
• Could a competing marketplace use your take rate, supplier concentration or buyer retention figures against you if they leaked?
• How would supply-side and demand-side participants react to a new institutional investor with stakes in other marketplaces?

A marketplace that has reached enough scale to post steady take-rate growth and diversified supplier concentration finds this decision much closer to a typical SaaS company's than the early-stage version of the same business did. Revisit these criteria as the marketplace matures rather than assuming the constraints that applied at an earlier stage still hold once the network effects and metrics stability the business has been building finally show up clearly in the numbers.

If the board has never sat through an institutional buyer's questions about take rate durability or supplier concentration risk, run a mock diligence session internally before the real one starts, using your own toughest questions rather than waiting for a Forge-sourced buyer to surface gaps in the story live. Boards that rehearse this once tend to present a noticeably more confident, coherent narrative when the real conversation happens.

A broader marketplace comparison rounds this out.