Lesson 1 of 9
Who is on the other side
One trade involves your broker, an execution venue, a clearing house and a seller you never meet. Each one takes a different risk and is paid differently.
By Javier Sanz
Founder of ValueScreener. Built Ninety Nine, a securities services provider, and sold it to a tier-one global bank; ran operations and internationalization at Alpaca, the brokerage API.
Who writes thisEditorial processLinkedIn (opens in a new tab)X (opens in a new tab)
In one minute
- A retail order usually passes through four separate firms, and only one of them is the one you opened an account with.
- The party that fills your order is often not another investor but a dealer holding inventory, which is why a fill can arrive in a fraction of a second.
- The clearing house steps between buyer and seller so that neither has to trust the other, and that substitution is what makes an anonymous market possible.
You press buy. A confirmation arrives. Nothing in that confirmation tells you which firms handled the order, what each of them did, or how each was paid.
There are four roles. One firm may play more than one of them, and that combination is where most of the confusion about "free" trading lives.
One order, four roles
- 1You
- 2Your brokerholds the account, routes the order
- 3Execution venuea wholesaler, an exchange or a dark pool
- 4Clearing housebecomes the counterparty to both sides
- 5The selleranother investor, or a dealer's inventory
Your broker holds the account, and may not trade it
The broker keeps the record of what you own, collects the money, and sends the order somewhere. In the United States most retail brokers do not execute the order themselves. They route it, and the choice of where is theirs.
Your shares are almost always held in the broker's name at a central depository rather than in yours. You are the beneficial owner, the broker is the record holder, and this is what "street name" means. It is why dividends, proxy materials and corporate actions reach you through the broker instead of from the company.
The venue is often a dealer, not an investor
The counterparty to a small retail order is frequently a wholesaler: a firm that buys from you and sells to somebody else, carrying the position in between and taking the risk that the price moves while it holds it.
That firm is not matching you with a person who wanted exactly your hundred shares at exactly that moment. It is quoting a price it is willing to trade at, in size, continuously. The speed of your fill comes from that inventory, not from a coincidence of timing.
An order can also go to a lit exchange, where the bids and offers are published, or to a dark venue, where they are not. The broker's routing decisions are disclosed publicly under Rule 606 of Regulation NMS, quarter by quarter, and that report is where a reader can see where their own orders actually go.
The clearing house removes the need for trust
Between the trade and the shares arriving, somebody has to guarantee that both sides perform. In US equities that is a central counterparty, which legally substitutes itself as buyer to every seller and seller to every buyer.
This is why you never learn who sold to you and never need to. Their failure is not your problem, and yours is not theirs.
Why the arrangement matters to a long-term holder
Someone who buys twice a year and holds for a decade pays this machinery very little, and that is the honest conclusion. The reason to understand it is not cost minimisation. It is that three of the four parties have obligations to somebody other than you, and knowing which is which tells you whose interest is being served when an execution looks odd.
It also explains a fact that surprises people: your broker failing is not the same as your shares vanishing, because the shares sit at the depository and the positions are recorded at the clearing level. Protections here are real and limited, and they are a matter of law rather than of the broker's promises.
Check yourself
A retail market order is filled in under a second. What most likely happened?
- Another individual investor happened to be selling that exact quantity
- A dealer sold from its own inventory and now carries the position
- The company issued new shares to meet the order
Show the answer
Answer: B.
Wholesalers quote continuously and fill from inventory. The speed comes from a firm willing to take the other side, not from a coincidence of two investors meeting.Shares bought through a broker are usually registered in whose name?
- Your own name, on the company's register
- The broker's, at a central depository, with you as beneficial owner
- The exchange's name
Show the answer
Answer: B.
This is street name registration. It is why company communications reach you through the broker rather than directly.What does a central clearing counterparty do?
- Sets the price of the trade
- Decides which venue the order is routed to
- Becomes buyer to the seller and seller to the buyer, so neither side depends on the other
Show the answer
Answer: C.
The substitution is the point. It removes the need for either side to assess the other's creditworthiness, which is what allows anonymous trading at scale.Sources
- Rule 606 of Regulation NMS, on quarterly public disclosure of order routing by broker-dealers, including any payment received for routing.
- Rule 605 of Regulation NMS, on published execution quality statistics from market centers.
- SEC investor education material on holding securities in street name and on the role of clearing agencies.
What this leaves out
- This describes the ordinary path of a small US equity order. Large orders, options, bonds and non-US markets each work differently.
- The diagram and the table are illustrative. No fee, spread or payment amount is stated, because those vary by broker, venue and security.
- Routing arrangements and the rules that govern them change. Check the broker's own Rule 606 report and the SEC's current rule text rather than this page.
- Nothing here is advice about any security, any broker or any venue.