2. Where your order really ends up: exchanges, internalisers and dark venues

Costs 3: Where your order really goes

When you press buy, you picture your order traveling to a public book where it meets the order of another investor. That picture describes what happens less and less well: your order enters a decision system that chooses between several destinations, and very often the one chosen is a place where it never becomes visible to anybody at all.

The public book is no longer the default destination

European regulation recognizes several categories of destination, and they are worth telling apart because they behave differently:

• Regulated market. The classic exchange: a public book, with price and time priority and transparency before and after the trade. This is where the reference price is formed.
• Multilateral trading facility (MTF). The same logic, but with rules of its own and a lighter regulatory load. It competes with the regulated market in the very same shares.
• Systematic internaliser. A firm that, in an organized and frequent way, executes client orders against its own capital. It is not a market: it is a house quoting prices.
• Unorganized bilateral trading. Direct agreements between two parties, reported afterwards but with no book.

The magnitudes are startling. In the United States, the volume executed away from the exchanges has for years hovered somewhere around 40% to 50% of the total, and once you isolate retail flow the proportion is far more extreme: the great majority of immediately executable private-investor orders never reach an exchange at all, but a handful of wholesalers. In Europe, continuous public books account for well under half of reported volume; the rest is split between auctions, internalisers and bilateral trading.

Systematic internalization: your counterparty is a house

For an internaliser to execute your order means the house gives you a price and keeps the position. It has real advantages: immediate execution, no exchange fee and often a shade better than the best public price of the moment. And a cost worth seeing: your order has not competed, because nobody else has seen it. If the internaliser also belongs to your broker's group, or pays it for the flow, the decision about where the order goes stops being a technical one.

Dark venues and why they exist

What are known as dark markets are multilateral systems operating under a waiver from pre-trade transparency: the orders are there, but they are not published until they execute. They were not born to hide anything from the retail investor, but to solve a legitimate problem of the large fund managers. If a fund needs to sell the equivalent of several days' volume, showing that intention moves the price against it before it has sold a thing. That is the market impact problem, and a dark venue lets you look for the other side without announcing it.

The European regulator accepted the argument but put a ceiling on it, because a market where nobody shows their intentions stops forming prices. For years a double limit applied: under certain waivers, a share could not trade above 4% of volume on any single venue or above 8% across all of them. The 2024 review replaced it with a single threshold of 7%. The principle stands: darkness is tolerated so long as it does not eat into the price discovery that everybody, dark venues themselves very much included, depends on to set their references.

What changes when your order never reaches the book

Three concrete effects, from least to most important for a private investor:

• You add no public depth. Your order does not thicken the book, which in aggregate makes trading dearer for everybody.
• Your price is measured against a reference that others build. The internaliser quotes off the best public price, and if less and less volume passes through there, that reference grows more fragile.
• You lose the chance of somebody bettering that price. In a book you may meet an opposing order better than you expected; internalized, you get whatever the house decides to give you.

Where your shares are: segregated versus omnibus

Another decision taken without you is how your securities are registered. In an individually segregated account, the securities are identified under your name, kept apart from the broker's own and from those of other clients. In an omnibus account, the broker opens a single global account in its own name on behalf of clients and keeps the breakdown internally.

The omnibus account is legal, standard and cheaper, and it is the norm when you trade abroad through a chain of custodians. Neither of the two turns you into an ordinary creditor if the broker fails: under both, the securities are yours and do not join its insolvent estate. The difference lies in the reconstruction. With individual registration, identifying your position is immediate; with an omnibus account, if the internal bookkeeping has been badly kept or falsified, it has to be rebuilt, and that means years with the position frozen.

For the worst case there are the investor compensation schemes, which cover not market losses but the broker's inability to give you back what is yours through insolvency or fraud. The amounts: in Spain, 100,000 euros per investor; in the United Kingdom, 85,000 pounds; in the United States, 500,000 dollars per client, with a maximum of 250,000 in cash. The European directive sets a floor of 20,000 euros and several countries sit close to it: with an account abroad, the figure that applies to you is the one from the broker's country.

A real case: the 1,600 million missing at MF Global

In October 2011 MF Global collapsed, an American broker with almost two centuries of history behind it, after a leveraged bet on European sovereign debt. When the books were opened a hole appeared in the client accounts of close to 1,600 million dollars: money that should have been segregated and had been used to cover the house's own liquidity needs. The clients did in the end get all of it back, but the process took years and thousands of accounts sat frozen. The lesson is not that segregation is useless, because segregation was precisely what allowed them to claim: it is that a bookkeeping obligation is worth exactly as much as the supervision that checks it.