The Rise of the Private Stock Exchange
Companies are staying private longer and their shares still need to trade. A quiet parallel market has grown up to do the job — and most investors have never heard of it.
Ask most people where shares are bought and sold and they will picture a trading floor, a bell, a ticker. That market still exists, of course, but beneath it — largely invisible to the public — a second market has grown to remarkable size: the private stock exchange, where shares in companies that have never floated change hands between professional investors, employees and funds. It is one of the more significant shifts in modern finance, and it has happened almost without comment.
The background is the great retreat from public markets. Thirty years ago a successful growing company floated relatively early, and ordinary investors could buy into the growth story. Today the average age of a company at flotation has stretched dramatically, and many of the most valuable young companies simply never list at all. The reasons are rational: public markets bring quarterly scrutiny, regulatory cost, activist shareholders and a share price that can punish a good business for a bad quarter. Private capital, meanwhile, has become deep enough that a company can raise billions without ever ringing a bell.
But staying private creates a problem. Shares in a private company are famously illiquid — the early employee whose options represent a fortune on paper cannot pay a school fee with paper, and the angel investor of fifteen years' standing would quite like to retire. Into that gap have stepped the private marketplaces: platforms and brokered venues where existing shareholders in unlisted companies can sell to approved buyers at negotiated prices. What was once an occasional, awkward, lawyer-heavy transaction has become a functioning market with price data, standardised paperwork and serious volume.
The mechanics differ from the public markets in ways that matter. There is no continuous quoted price; value is discovered deal by deal, often anchored to the company's last funding round. Buyers are typically restricted to professional or qualifying investors. And the company itself usually holds a veto — most private companies' shareholder agreements give them the right to approve or refuse any transfer, which means the market operates with the permission of the issuer in a way the London Stock Exchange never does. Liquidity is rationed, not free.
The advantages are real. Early employees and founders can turn some of their equity into actual money without waiting a decade for a flotation that may never come. Long-term investors can rebalance. New specialist funds can buy stakes in mature private companies that would otherwise be closed to them. Companies can run organised programmes — letting staff sell a limited percentage of holdings at a set price — which has become a genuine tool for retaining people who would otherwise leave to realise their equity.
The disadvantages deserve equal weight. Pricing is opaque compared with a public quote, and the spread between what a seller accepts and a buyer pays can be wide. Fees are heavier. Information is thinner — you are buying a company without the disclosure regime a listed business must maintain, so diligence falls on you. Minimum deal sizes and investor restrictions keep ordinary savers out entirely, which raises a fair question about a financial system in which the public is invited to buy companies only after the fastest growth has already been captured privately.
For a business owner, the lesson is that share liquidity is no longer a binary choice between private and floated. Secondary markets, structured tender programmes and employee liquidity windows are now part of sensible long-term planning — something to design into shareholder agreements early rather than improvise when a restless early investor appears. For an investor, the lesson is sharper: the private markets offer access to remarkable companies, at the price of opacity, illiquidity and paperwork. You are compensated for the inconvenience. Whether you are compensated enough is the entire question.
The deeper story is that the boundary between public and private is dissolving, and with it the old assumption that the stock exchange is where grown-up companies live. The action increasingly happens offstage, in rooms most of us will never see. Whether that is good for the ordinary saver is doubtful. Whether it is the future is not.
