Exchanges Come Last in Private Markets

Private market liquidity is still in the plumbing phase, not the exchange phase. Before a real screen based market can work, someone has to know who owns each share, which transfers are allowed, what the company approves, how taxes and paperwork get handled, and which brokers can actually find the other side of a trade. That is why cap table systems, broker networks, and pricing data tools show up before a true exchange.

• Carta sits closest to the transfer agent and ledger layer. In plain terms, it keeps the official record of who owns what, then helps process share movement. That is the private market equivalent of the recordkeeping infrastructure that public markets built long before modern electronic venues.
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• The broker layer still does much of the real work. In private stock, brokers find sellers and buyers one by one, negotiate price, gather company consent, and push paperwork through. Even mature public markets kept this human layer for decades, and parts of fixed income still work that way today.
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• The closest comps show the sequence. Nasdaq Private Market acquired SecondMarket in 2015 to add private share liquidity infrastructure, and Forge today combines broker dealer rails with pricing data and transaction workflow. Both reflect a market that is still standardizing access and settlement before it fully standardizes trading.
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The next buildout is likely to be better data, cleaner transfer workflows, and more issuer approved trading windows, with exchanges coming only after those habits are routine. The winner is likely to look less like a flashy marketplace first, and more like the system that every broker, company, and shareholder already trusts to move shares correctly.