Trading Venues: Exchange, Dark Pool and Over the Counter
A trading venue is any arrangement where buying and selling interest meets and trades are agreed. Three kinds differ on two answers: whether interest is shown before the trade, and who stands between the two sides after it. On an exchange both are settled by the arrangement itself. Over the counter neither is, so the two parties keep each other.
Almost everything people reach for when they describe a venue sits downstream of those two answers. How fast it matches, how much passes through it, what it is built on, whether the name is familiar: each of those is a consequence or an accident, and not one of them says what is actually held once a price has been agreed. Two questions do, and they are short enough to carry into a venue that has not been built yet.
So the shape of this guide is one order, worth Rs 1,00,000/-, walked through three arrangements in turn with the same two questions asked at every stop. The order size of Rs 1,00,000/- is a control setting and nothing more, chosen so the arithmetic stays readable rather than because anybody's order is typically that big. Reading the two questions off each walk writes the comparison at the end before it arrives.
What actually tells one trading venue from another?
Two questions do all the work, and it is worth committing them rather than the list of venue names that usually gets taught instead. The first is about the moment before the trade. Is the waiting buying and selling interest shown to participants, or is it not? The second is about the moment after. Who steps between the two sides once a price has been agreed, and does anybody step there at all?
Ask those two questions of any arrangement where trades are agreed, and everything else about it is detail. This is the instruction to carry away. Venues will keep appearing with new names, and the names will keep implying things about technology and speed that have nothing to do with what is actually held. Put the two questions to a new one and it can be placed inside an hour, whoever built it and whatever it is called.
Here is the household version, and it is closer than it looks. There are two ways to sell a second-hand fridge. One: a card goes up on the housing society board with a price on it, everybody in the building can see what is being asked before anybody knocks, and the society office collects the money, hands it across and keeps the receipt. Two: a telephone call to a cousin's neighbour, a number settled between the two of them during the call, and one of them carries cash to the other's door. Nothing about the fridge changed. Two things changed: who could see the price beforehand, and who was standing in the middle when the money moved. If the cousin's neighbour turns up empty handed, there is nobody to go to except the cousin's neighbour.
Two questions sort every trading venue there is. Which pair?
How Order Flow Moves Through a Trading Venue: where do the three paths part?
Take the same order and walk it three times. Rs 1,00,000/- of something, one buyer, one decision, three different places for that decision to land. Walking it rather than describing it shows the steps that are identical in all three, and the two steps where the arrangements separate, one at a time.
Through an exchange
The path an order takes from a click to an execution is worked separately. The bones of it are enough here. The order reaches Kaveri Stock Exchange Limited, an invented exchange, on a broker's membership rather than on any relationship the buyer has with the venue. The order either waits in an order bookThe list of buy and sell orders waiting at a venue at a given moment, each with its price and its size. The contents of an order book, and what it leaves out, are worked separately. that participants can see, or it matches at once against interest already sitting there. At the instant it matches, the clearing corporation of Kaveri Stock Exchange Limited steps into the middle and becomes the party each side faces. The clearing corporation is a separate company from the exchange.
The venue takes a transaction fee of 0.00325 per cent of turnover for the stated year. Read on this one order, the fee is Rs 1,00,000/- multiplied by 0.0000325, which comes to Rs 3.25/-. The same rate read on a year of turnover and read on one order produces two numbers that have nothing to do with each other, so name the base every time.
Neither side ever learns who was on the other side of that trade, and the arrangement is built so that neither needs to. That property carries into the next two walks, and what becomes of it there is the thing to follow. Anonymity is comfortable here only because something else is true underneath it: a company the buyer did not choose has taken on the obligation, so the identity of the party who originally sent the matching order stopped being a fact about the position the moment the two orders met.
A purchase of Rs 1,00,000/- of something on Kaveri Stock Exchange Limited matches. Will the buyer ever learn who sold it, and does that matter?
Through a venue that does not display interest first
The popular name does most of the misleading, so describe this one plainly. A venue of this kind accepts orders and matches them against each other, exactly as any venue does. The one thing it does not do is show the waiting interest to participants beforehand. Hiding the waiting interest is the whole of the mechanical difference. Everything atmospheric that attaches to the name in ordinary conversation is somebody else's addition rather than a property of the arrangement.
Not showing the waiting interest changes what other participants can see before a trade happens, and it does not by itself change who stands in the middle after one. Those two facts are separable and are constantly bundled together. Who becomes the party each side faces afterwards depends on how the trade is cleared. Clearing is a different arrangement altogether from whether the interest was visible, and the Securities and Exchange Board of India (SEBI) sets it at sebi.gov.in.
Why would anybody want interest kept out of sight? Because a very large order sitting visibly in a book is an announcement. Somebody working through a great deal of one thing may prefer that nobody knows it is happening until it has happened. The effect of a large visible order on the price is a question about how prices form, and it is covered well away from here. Whether a venue of this kind may operate at all, for whom, and on what terms, is set by SEBI at sebi.gov.in.
Commit to an answer before reading on. Two parties agree a trade directly with each other and no venue is involved anywhere. Who is standing between them afterwards?
Over the counter, with no venue at all
Two parties reach each other directly, settle on a price between themselves, and that is the trade. There is no book. Nothing was shown to anybody, because there was nobody to show it to. There is no rule about who gets served first, because nobody else is in the room waiting to be served. Strip a venue out of a trade and what remains is an agreement between two named parties, which is what a bilateralRunning between exactly two parties, with nobody else joined to the arrangement. The opposite of one where a third party is inserted into the middle of it. arrangement means.
Nobody steps into the middle afterwards unless the two parties arrange it themselves. This is the consequence that matters more than any other sentence here. Each side is left holding the other one's name, the other one's promise and the other one's risk, and holds all three right through until money and securities have actually changed hands. Nothing has gone wrong in that description. It is simply what a trade is when no arrangement has been made to convert it into something else.
The anonymity from the exchange walk has inverted rather than disappeared. There the party on the other side was never learned and never needed to be. Here it was known before anything started, and it had to be, because the identity of the party opposite is the entire quality of what is held until the trade completes.
Now put the three walks beside each other in one picture. Two of the four steps are identical wherever the order goes, which is worth seeing as clearly as the differences, because a reader who thinks the three arrangements are different all the way through will look for distinctions that are not there. An order is placed in all three. A trade is agreed in all three. The parting happens at exactly two moments, and they are the two questions from the opening block.
Exchange vs OTC Market: what is the one difference that matters?
Put the three side by side on five questions and the answer stops being a matter of impression. Is the interest displayed before the trade? Who may participate? Who is the counterparty afterwards? Is the trade reported, and when? And is the party on the other side ever learned? Five rows, three columns, and one of the five rows is doing something the other four are not.
The counterparty row is the one that changes what the trade actually is, and the display row is the one everybody talks about. The difference between those two kinds of difference is worth dwelling on. Display changes what other participants knew in the seconds before a price was agreed. Information matters. The counterparty row changes what is held for every hour until the trade completes, and it changes it from a claim on an institution that stepped in on purpose to a claim on whoever happened to be selling. The counterparty row is not information about the trade. The counterparty row is the trade.
Two of the five rows are honest blanks, and it is worth saying why rather than skating past them. Reporting is set by SEBI at sebi.gov.in in every one of the three columns. The row therefore carries the authority in all three cells and no value anywhere. The counterparty cell for the second and third columns is genuinely conditional. Clearing is an arrangement made about the trade rather than a property of where it happened, and it sits with the same authority.
Of the five rows in that comparison, which one changes what the trade actually is, and which one gets talked about most?
What happens when the other side fails?
The comparison stops being academic at the moment somebody fails to deliver, and each arrangement is worth working separately rather than summarising. Somebody agreed to deliver and has not. Nothing about that sentence changes across the three columns. The party standing in between changes completely.
On a trade matched at Kaveri Stock Exchange Limited, the party each side faces is the clearing corporation. The clearing corporation took the obligation on at the instant of the match and holds resources against exactly this situation. The corporation holds marginAn amount collected from a member up front against what that member may come to owe. How much is collected, and on what, is set by the authority named below. of Rs 11,000 crore, and a settlement guarantee fundA pooled resource kept aside by a clearing corporation to be drawn on when a member does not meet what it owes. Pooled, where margin is collected member by member instead. of Rs 2,750 crore. Divide the one by the other. Rs 11,000 crore over Rs 2,750 crore comes to 4.00 times the fund. Both amounts sit with the clearing corporation and neither sits with the exchange, and that separation is not a technicality: the exchange matched two orders and stepped out.
Over the counter, with nobody in the middle, the other side of the failed Rs 1,00,000/- trade has one remedy and one asset. The remedy is the failing party. The asset is whatever that party has left. There is no pooled resource to reach for, no order in which anything is reached, and no company that has already taken the obligation on. The whole of what stands behind the trade is the person or the institution that agreed it.
The party in the middle did not make the failure less likely. The party in the middle moved who is standing in front of it. This is the finding of the whole walkthrough in one line, and it is more useful than the comfortable version. Nothing about a clearing corporation reaches backwards and makes a member more capable of delivering. A clearing corporation absorbs the consequence instead. The other side of the trade never had a relationship with the party that failed, so there is nobody for it to chase.
The clearing corporation then reaches those resources in an order fixed in writing long before anything failed. The order is the protection, and not the total. One of the two amounts is collected member by member against each member's own obligations and the other is pooled, so adding Rs 11,000 crore to Rs 2,750 crore says nothing about who bears a loss. Which resource is reached first, the Rs 11,000 crore of margin or the Rs 2,750 crore fund, and which is reached only if the first runs out, is what decides the answer. The order itself, and every threshold inside it, is set by SEBI at sebi.gov.in.
The other side of a trade fails to deliver. What is genuinely different between a trade matched on an exchange and one agreed directly?
Does having a party in the middle make a failure less likely?
Predict before reading the next part. Name a reason a trade might happen somewhere other than an exchange that has nothing to do with anybody preferring one venue.
Why would anybody trade away from an exchange at all?
None of this is a warning against trading away from an exchange. Trades happen away from an exchange constantly and for reasons that have nothing to do with anybody thinking less of exchanges. Three of those reasons are plain enough to hold onto.
The first is that some things are not listedAdmitted to a venue for trading, so that orders in it can meet there. The conditions for admission are set by the authority named below. anywhere. No exchange has taken the thing on, so no book exists in it, and a party wanting to buy or sell one has nowhere to go except to somebody else who wants the other side. Nothing is being avoided here. There is simply no venue in the picture at all.
The second is that some trades are too particular to be standard. A venue matches interest by treating one unit as interchangeable with the next. Interchangeability requires everything about the units to be standardisedCut to the same terms as every other one of its kind, so that any two are interchangeable and a stranger can take either side without reading it first.. There is no queue of people waiting to take the other side of exactly that, so two parties who want an arrangement on terms nobody else would want have made something no book could match.
The third is size and visibility, already met in the middle walk. A party moving a great deal of one instrumentA thing that can be bought and sold and that carries rights of some kind, a share or a bond for instance. The worth of any instrument is covered well away from here. may prefer that the fact is not visible until it is finished.
None of those three is a reason to prefer one venue over another. They are reasons the other arrangements exist, which is a completely different sentence and worth keeping separate. A structure that exists because a need exists is not thereby recommended.
The failure: assuming the party in the middle came along too
The mistake belongs to the reader who has just understood the material well. Somebody who can now explain that a clearing corporation becomes the party each side faces has understood a real thing. Then they agree a trade directly with somebody, and quietly assume that something similar is standing behind it. Nothing is, unless the two of them arranged it.
The protection was never a property of trading, it was a property of one venue's arrangements, and it did not travel. One kind of reader cannot make this mistake: the one who never understood the clearing corporation in the first place. There is no protection to carry across, so none is carried. The better the exchange walk was learned, the more available this error becomes, and that inversion is worth knowing about.
The cost of the mistake is not abstract. The other side of that trade is holding one name and one promise. If the promise is not kept, there is no pooled resource, no sequence in which anything is reached, and no company that has already taken the obligation on. There is the counterparty and whatever is left of them. The fix is one question, asked out loud after every agreement of any kind: after this trade, who am I facing?
How does somebody actually use this before they agree anything?
Three checks, and they run in this order
First, find out where the trade is going to happen before looking at anything else about it. A screen showing a price rarely says which arrangement produced it, so the obvious first step gets skipped constantly. An analyst reading somebody else's account of a trade does the same thing in the same order: locate the venue, or establish that there was not one, and only then read the rest.
Second, ask the counterparty question and insist on a name for the answer. Not a reassurance, a name. On an exchange trade the name is the clearing corporation, and it is a different company from the exchange whose name is on the screen. On a trade agreed directly the name is the party opposite, and the honest answer may be that there is nobody else at all. A person who can produce that name for any trade can read an account of any failure anywhere in this part of the market and know at once which company is being described.
Third, where the answer to the second check is nobody, what matters is naming what has been taken on rather than deciding anything about it. For as long as the trade takes to complete, one party's promise is the whole of what stands behind the Rs 1,00,000/-. One party's promise standing alone is a fact about the arrangement and not a verdict on it, and plenty of perfectly ordinary trades are made on exactly that basis. A household selling a plot of land to a neighbour is in the same position and does not usually think of it that way. The two questions and the habit of asking them out loud are what survive every change of venue name.
Who sets the conditions on where a trade may happen?
Four of the things circled above are set by an authority rather than by any venue, and they are revised, so a line printed here would be an incorrect one rather than merely an ageing one. The rows below therefore carry the authority inside the row where a value would otherwise sit. A blank sheet still names which condition exists and where the answer lives, and it can be filled from the source in one sitting.
The fourth row is the most important empty row of the four, and it deserves its own sentence. Whether a venue that does not display interest may operate at all, for whom and on what terms, is a decision made by the authority in each market. The third arrangement is therefore a structure rather than something available in any particular market. A claim about availability would be a claim about one market, and the structure is the part that survives a change in the rules. For the same reason, post-trade reportingTelling the market that a trade has happened, after it has happened. The content of a report, its sender and its deadline are set by the authority named in the rows below. appears in the second row: it is a live requirement everywhere, and its content belongs to the authority.
Four conditions named here, each with its value held by the authority
| What is set | The value here | Who sets it |
|---|---|---|
| Which venues a trade may be executed on, and what each of them must report | Not stated here | SEBI at sebi.gov.in |
| What is displayed before a trade on each kind of venue | Not stated here | SEBI at sebi.gov.in |
| Whether and how a trade agreed away from an exchange is reported and cleared | Not stated here | SEBI at sebi.gov.in |
| The conditions on which a venue that does not display interest may operate at all | Not stated here | SEBI at sebi.gov.in |
All four of these move, and a figure written into the value column would be out of date before it was read. A second market adds another set of rows underneath these ones rather than forcing a rewrite of anything above them. Adding rows rather than rewriting is the test of whether a structure was taught or a rulebook was summarised.
The three arrangements are separated by structure rather than by quantity, so the comparison is carried by drawings instead of a control. A control moves one quantity and shows what happens to another. Everything that separates these three arrangements is a structural answer instead: displayed or not, somebody in the middle or nobody. The single quantity a reader might want to move is the size of an order against how visible it is. A control on that would be modelling what a large order does to a price, covered well away from here and wherever the order book itself is described. So the comparison is carried by the drawn table and the two structure pictures, and every figure here is printed as static text with its base and its holder beside it.
A trade has just been agreed. The single question this guide opened with applies.
Last one. Whether a venue that does not display interest may operate at all in a given market is decided by whom?
Where every blank left here gets filled in
| What is covered elsewhere | Where it is decided | Site | Address checked |
|---|---|---|---|
| Which venues a trade may be executed on, and what each of them must report | Securities and Exchange Board of India | sebi.gov.in | 24 August 2026 |
| What is displayed before a trade on each kind of venue | Securities and Exchange Board of India | sebi.gov.in | 24 August 2026 |
| Whether and how a trade agreed away from an exchange is reported and cleared | Securities and Exchange Board of India | sebi.gov.in | 24 August 2026 |
| The conditions on which a venue that does not display interest may operate at all | Securities and Exchange Board of India | sebi.gov.in | 24 August 2026 |
| The sequence in which a clearing corporation reaches its resources when a member fails, and every threshold inside it | Securities and Exchange Board of India | sebi.gov.in | 24 August 2026 |
Kaveri Stock Exchange Limited and the clearing corporation of Kaveri Stock Exchange Limited are invented.
Educational material. Not advice on any investment, tax, budget or market position.