Execution & Market Integrity
UMIR abusive trading rules, best execution, gatekeeping and insider trading obligations, all seven order types, the T+1 settlement cycle (effective May 27, 2024), Canadian marketplaces, margin accounts, cash account rules, and client reporting requirements.
Canada moved to T+1 (trade date + 1 business day) settlement for equity and ETF trades on May 27, 2024 — one day before the US (May 28, 2024). Previously T+2. This is the most significant recent change to the execution and settlement framework. All RSE exam questions on settlement timing should use T+1.
UMIR — Best Execution & Abusive Trading
The Universal Market Integrity Rules (UMIR) are the market integrity rules administered by CIRO (formerly IIROC) that govern the conduct of Participants (investment dealers) and Access Persons trading on Canadian marketplaces. UMIR applies to all trading on recognized exchanges and alternative trading systems (ATSs) in Canada. UMIR's core purpose: ensure fair, efficient, and transparent markets that protect investors and maintain public confidence.
Best Execution
Best execution is the obligation of investment dealers to make reasonable efforts to achieve the most advantageous execution terms for client orders under the circumstances. It is one of UMIR's most fundamental requirements and applies whenever a dealer handles a client order.
What Best Execution Requires
| Factor | Description | How Dealers Address It |
|---|---|---|
| Price | The primary factor — achieving the best available price for the client (highest price for sell orders; lowest price for buy orders) across all accessible marketplaces | Smart Order Routing (SOR) technology scans all accessible marketplaces and routes to the venue offering the best price at the time of order submission |
| Speed of execution | Orders should be executed promptly — delays can cause the client to receive a worse price than was available when the order was entered | Direct market access; co-location services; low-latency systems; electronic execution |
| Certainty of execution | The probability that the order will actually be filled — a marketplace with a slightly worse price but much higher liquidity may provide better overall execution for large orders | Routing larger orders to primary exchanges (TSX) which typically have deeper liquidity than ATSs for most securities |
| Total transaction cost | All costs including commissions, exchange fees, spread, and market impact — not just the price of the security itself. A slightly better price that comes with higher exchange fees may produce a worse net outcome. | Cost analysis incorporating exchange/ATS access fees in routing decisions |
Best Execution — Key Obligations
- Written policies required: Each dealer must maintain written policies and procedures explaining how they achieve best execution for client orders — including how they select marketplaces, how they use Smart Order Routing, and how they handle different order types
- No self-dealing priority: Dealers cannot route orders to a marketplace simply because it benefits the dealer financially (e.g., better exchange rebates) if doing so harms the client's execution quality
- Fragmented markets: Since Canadian equities trade on multiple venues simultaneously (TSX, Cboe Canada, Alpha, CSE), the dealer must consider all accessible venues to find the best price — not just route to one default venue
- Client instructions override: If a client gives a specific instruction about how their order should be handled (e.g., "execute only on TSX"), the dealer follows that instruction — this takes precedence over the dealer's best execution methodology
- Periodic review: Dealers must periodically review the effectiveness of their best execution policies and update them as market conditions and available venues change
"Best price" ≠ "best execution." Best execution considers price, speed, certainty, AND total cost. A dealer who always routes to the venue with the lowest exchange fee may not be achieving best execution if that venue consistently has inferior prices. The obligation is to consider all relevant factors holistically — documented in written policies — and make reasonable efforts to optimize the overall result for the client.
Abusive Trading — Four Categories
UMIR identifies four main categories of abusive trading that undermine market integrity. Each represents conduct that is either explicitly prohibited or subject to regulatory action.
1. Specific Unacceptable Activities (UMIR Rule 2.1)
UMIR Rule 2.1 prohibits a Participant or Access Person from entering, directly or indirectly, a trade or order that the person knows or ought reasonably to know involves:
| Unacceptable Activity | Description | Example |
|---|---|---|
| Wash trading | Simultaneously buying and selling the same security to create the appearance of trading activity without a genuine change in ownership. Creates false volume. | Trader A sells 10,000 shares of XYZ to Trader B, while Trader B simultaneously sells 10,000 shares of XYZ back to Trader A at the same price — no economic position changes but volume spikes artificially on the tape |
| Matched orders | Orders entered by two parties who have pre-arranged the terms of the trade — price, quantity, timing — so the trade will occur as designed without genuine price discovery | Two hedge funds arrange to trade a thinly traded stock at $5.00 at 3:58 PM to create a misleadingly high closing price; both have agreed the terms in advance |
| Painting the tape | Executing a series of trades — which may be real transactions — specifically designed to give the impression that a security is actively traded, thereby attracting other investors who react to the apparent activity | An investor repeatedly buys and sells a small-cap stock in small amounts throughout the day to make it appear actively traded, hoping other investors will notice and buy, driving up the price |
| Spoofing | Entering orders with the intent to cancel them before execution — specifically to create a false appearance of supply or demand that influences other participants' behavior | Entering a large buy order for 500,000 shares at $9.95 (when the market is at $10.00) to make the market look stronger; once other sellers lower their asks in response, cancel the 500,000 share order |
| Layering | Entering multiple orders at different price levels to create an artificial appearance of depth in the order book, then canceling them — similar to spoofing but using multiple orders at multiple levels | Placing buy orders at $9.90, $9.85, $9.80, $9.75 simultaneously to make the order book look like there is strong buying support, then canceling all of them once the desired price movement occurs |
2. Manipulative and Deceptive Practices
These are broader practices designed to mislead other market participants about the true supply, demand, or value of a security.
- High closing / banging the close: Buying or selling aggressively near the end of the trading day specifically to influence the closing price — which is used for fund NAV calculations, derivatives settlement, and index rebalancing. Closing prices are critical reference points; manipulating them harms many downstream parties.
- Marking the open: Similar to high closing but at the market open — aggressive orders placed at the open specifically to establish an artificial opening price
- Rumour mongering: Spreading false or misleading information about a security or company through any channel (social media, forums, reports) to move the price — "pump and dump" in its information-propagation form
- Cornering the market: Accumulating a dominant position in a security or commodity to control supply and force other participants (particularly short sellers) to transact at artificially elevated prices
- Cross-market manipulation: Trading in one market (e.g., derivatives) to influence prices in another market (e.g., the underlying equity), or vice versa. Trading the underlying to benefit derivative positions.
3. Artificial Pricing
Artificial pricing occurs when a person or group of persons engage in a pattern of trading — including the entry, amendment, or cancellation of orders — that results in or contributes to an artificial price for a security. The price does not reflect genuine supply and demand.
4. Improper Orders and Trades
| Improper Practice | Description | Why It's Prohibited |
|---|---|---|
| Trading ahead of research | A dealer's trading desk buys or sells a security before the firm publishes a research report that is expected to move the price — profiting from the anticipated market reaction to the firm's own research | Exploits confidential information and the anticipated behavior of clients who will act on the research; conflicts of interest between dealer proprietary trading and client advisory functions |
| Interpositioning | Inserting the dealer as an intermediary (buying from the market and reselling to the client at a marked-up price, or vice versa) when the client could have been given direct access at better terms | Adds cost without adding value — the client pays more (or receives less) than they would with direct market access |
| Churning | Excessive trading in a client's discretionary or managed account, primarily to generate commissions rather than to benefit the client's investment objectives | Conflicts of interest — serves the dealer's financial interests at the direct expense of the client's account returns |
| Trading at unauthorized prices | Executing trades at prices outside the client's instruction (e.g., executing a limit buy order at $10.50 when the client specified no more than $10.00) | Violates the express terms of the client's order — the client set specific parameters that must be respected |
| Unauthorized discretion | Making investment decisions for a client's account without the client's pre-authorization and without a discretionary account agreement — trading on the client's behalf without their specific instruction or blanket authority | Clients must have control over their accounts; unauthorized discretion removes this control |
Front Running (UMIR Rule 4.1)
Front running is one of the most serious market integrity violations. It occurs when a Participant or person with knowledge of a pending client order trades in the same security for their own account (or a related account) ahead of executing the client's order, knowing that the client's order will likely move the market price in a predictable direction.
UMIR Rule 4.1 — Specific Front Running Prohibition
- Triggered by knowledge of material order: The prohibition applies when the person KNOWS of an order that, if executed, is likely to affect the price of the security — regardless of whether it is their client's order or another participant's order
- Applies to all related accounts: Not just the person's own account — also includes accounts of family members, associates, or firms in which the person has an interest
- Derivatives front running: Also prohibited — buying call options (or other derivatives) on a security ahead of a large client buy order in that security is front running the equity order through the derivatives market
- Consequence: Front running violates UMIR, securities legislation, and fiduciary duty. It is treated as a serious form of fraud — persons convicted face significant fines, trading suspensions, and potential criminal prosecution
Front running and insider trading are related but distinct: Front running involves trading ahead of a known CLIENT ORDER — the material information is the client's pending transaction. Insider trading involves trading on material non-public information about the company itself (earnings, M&A, regulatory decisions). Both are serious market integrity violations — but different rules apply and different regulators may be involved (CIRO/UMIR for front running; provincial securities commissions for insider trading).
UMIR Gatekeeping Responsibilities
Purpose of UMIR Gatekeeping Obligations
Gatekeeping is the responsibility of investment dealers and their registered representatives to act as a first line of defence against market manipulation, fraudulent trading, and other violations of market integrity. Dealers are positioned to see trading patterns that regulators and the public cannot — making them uniquely capable of detecting and preventing abusive conduct.
UMIR gatekeeping obligations are grounded in the principle that Participants who have access to marketplaces and client accounts bear a responsibility to prevent those access points from being used for abusive or illegal purposes. The dealer is the gatekeeper to the market.
Core Gatekeeping Components
1. Know Your Client (KYC)
Understanding the client's financial background, investment knowledge, trading history, and typical activity patterns. Gatekeeping starts with KYC — if you don't know what normal looks like for a client, you can't detect what's abnormal.
2. Surveillance
Monitoring client orders and trading patterns for anomalies. Dealers must have surveillance systems capable of detecting the specific patterns associated with abusive trading — unusual volume spikes, circular trading, trading that clusters around material announcements.
3. Escalation
When suspicious activity is detected, it must be escalated through the proper internal channels (compliance, senior management) and, where required, reported to regulators (CIRO, provincial securities commissions, FINTRAC).
4. Refusal
Gatekeeping includes the obligation — and authority — to refuse to handle an order or transaction that appears to be abusive or improper. Dealers are not required to be conduits for manipulation even if the client instructs them to execute the order.
Identifying Suspicious Transactions
Establishing the Client's Typical Financial Activity and Patterns
The foundation of suspicious transaction identification is knowing what NORMAL looks like for each client. This is why thorough KYC — ongoing, not just at account opening — is essential for effective gatekeeping.
| Normal Client Baseline | Suspicious Deviation | Possible Explanation to Investigate |
|---|---|---|
| Client typically makes 5–10 small trades per month in Canadian blue-chip equities | Suddenly places 200 rapid-fire orders in a thinly traded micro-cap stock over two days | Possible manipulation scheme; account takeover by bad actor; market manipulation coordinated with others |
| Client has no history of trading in penny stocks or speculative securities | Requests purchase of large position in a company immediately before a major announcement | Possible insider trading — client may have access to material non-public information about the announcement |
| Client's account generates modest monthly income | Client suddenly deposits $500,000 in cash or wire transfers from previously unknown third parties | Possible money laundering — FINTRAC Large Cash Transaction Report required; AML investigation triggered |
| Client sells securities and immediately reinvests proceeds — typical investment rotation | Client frequently buys and immediately sells the same securities at essentially the same price with no economic purpose | Possible wash trading or generation of misleading volume — may be in coordination with related accounts |
| Client holds diversified, long-term portfolio | Client begins placing very large sell orders in a single stock concentrated in the last 30 minutes of trading | Possible "banging the close" — attempting to manipulate the closing price for settlement purposes |
Red Flags Requiring Escalation
- Trading patterns inconsistent with KYC: Activity dramatically inconsistent with the client's stated investment knowledge, objectives, financial situation, or historical patterns
- Clustering around announcements: Significant purchases or sales of a security immediately before material announcements (earnings, M&A, regulatory decisions) — without an established pattern of such timing
- Orders designed to affect closing price: Large orders placed near market close in securities where the client appears to have offsetting positions (derivatives, short positions) that would benefit from a specific closing price
- Third-party instructions: Orders being placed by someone other than the account holder, or proceeds being directed to third-party accounts
- Structured cash transactions: Multiple cash transactions just below reporting thresholds (structuring) — a specific money laundering red flag
Insider Trading — Obligations and Violations
Insider trading is the purchase or sale of a security with knowledge of material, non-public information (MNPI) about the issuer. It is prohibited under provincial securities legislation across Canada (not UMIR specifically, but provincial Securities Acts). UMIR gatekeeping obligations require dealers to detect and report possible insider trading activity.
Key Definitions
| Term | Definition | Example |
|---|---|---|
| Material Information | Information that, if publicly known, would reasonably be expected to have a significant effect on the market price or value of a security | Undisclosed quarterly earnings significantly above consensus; an unannounced merger; a major product recall; a regulatory approval or rejection; CEO departure |
| Non-Public Information | Information that has not been generally disclosed to the investing public through a press release, regulatory filing, or other broadly accessible channel | Information shared only with a company's board, executives, or advisors before a public announcement; information accidentally leaked to a small group before official release |
| Insider (Reporting Insider) | For TSX/TSXV-listed companies: officers and directors; persons who own or control 10%+ of voting securities; persons who receive MNPI in the course of a special relationship with the issuer (lawyers, accountants, bankers, consultants) | A CFO who knows next quarter's earnings are 40% above consensus; a lawyer working on an undisclosed acquisition; an investment banker advising on a merger |
| Tipping | Sharing MNPI with another person who then trades on it — both the tipper AND the tippee can be liable for insider trading violations | A director tells their spouse about a pending acquisition; the spouse buys call options; both may be liable — the director for tipping, the spouse for trading on MNPI |
Insider Trading — Regulatory Framework in Canada
- Provincial prohibition: All provinces prohibit insider trading under their Securities Acts (e.g., Securities Act (Ontario) section 76). The prohibition applies to any person — not just corporate insiders — who trades with MNPI obtained through a "special relationship" with the company
- Civil and criminal penalties: Civil penalties (disgorgement + up to triple the profit gained or loss avoided + additional administrative penalties); criminal prosecution under the Criminal Code for the most serious cases (up to 10 years imprisonment)
- SEDAR+ insider reports: Reporting insiders must file reports of their trades through SEDAR+ (now replacing SEDI) within 5 calendar days of a change in their ownership position
- Trading blackout periods: Most public companies impose blackout periods during which insiders cannot trade — typically beginning when quarterly reporting processes start and ending 2 business days after public release of results
- Dealer obligation: When an RR or dealer suspects a client may be trading on MNPI, they must escalate to compliance, potentially refuse the order, and report to the appropriate provincial securities regulator. The dealer cannot continue to facilitate suspected insider trading merely because the client insists the trade is legitimate.
Whistleblower Protections
Canadian securities regulation includes whistleblower programs that protect and incentivize individuals who report securities violations to regulators. Understanding these frameworks helps RRs recognize their own reporting rights and those of clients or colleagues who may be aware of violations.
| Program / Framework | Key Features | Protections |
|---|---|---|
| OSC Whistleblower Program (Ontario) | The OSC pays financial awards to eligible whistleblowers who report securities law violations — awards of 5–15% of sanctions collected above $1 million. Established 2016. Reports can be submitted anonymously through a lawyer. | Anti-retaliation provisions: employers cannot dismiss, demote, suspend, discipline, or intimidate employees for reporting in good faith. Employees who suffer retaliation can seek reinstatement and compensation. |
| Federal whistleblower protections | Certain federal statutes (Public Servants Disclosure Protection Act for public employees) provide additional protection. Bill C-208 and subsequent amendments have strengthened corporate whistleblower protections in federally regulated industries. | Similar anti-retaliation provisions; disclosure protected if made in good faith based on reasonable belief that a violation exists |
| CIRO internal escalation | CIRO rules require dealers to have internal escalation procedures allowing employees to report concerns to compliance without fear of retaliation. Compliance departments must investigate reports in good faith. | Internal non-retaliation policies; most dealers have anonymous reporting hotlines; escalation to compliance protected by dealer's internal policies |
| Criminal Code protections | Section 425.1 of the Criminal Code prohibits employers from retaliating against employees who report Criminal Code violations (including criminal market manipulation and fraud) to law enforcement | Criminal sanctions for employers who retaliate against whistleblowers reporting criminal conduct |
RRs who become aware of securities violations have a professional and potentially legal obligation to escalate — not to participate, cover up, or facilitate. Key protections: whistleblowers reporting in good faith are protected from employer retaliation under securities legislation and, for the most serious violations, under the Criminal Code. The OSC Whistleblower Program provides financial incentives (awards) in addition to legal protection — encouraging reporting of significant violations that might not otherwise come to light.
Reporting Obligations to Firms and Regulators
Internal Reporting — Within the Firm
- Immediate escalation to compliance: Any RR who becomes aware of potential market manipulation, insider trading, suspicious transactions, or regulatory violations must escalate to the firm's compliance department immediately — not investigate independently, not confront the client, not delay
- Compliance officer authority: The compliance officer may suspend trading, refuse orders, conduct an internal investigation, and make determinations about external reporting obligations
- Do not tip off the subject: When suspicious activity is being reported or investigated, the RR must NOT inform the client or other implicated persons that a report has been filed or an investigation is underway — this could constitute "tipping off" which is itself a violation
- Documentation: All escalations and their outcomes must be documented in the firm's records
External Reporting — To Regulators
| Reporting Body | What Must Be Reported | Timeline |
|---|---|---|
| CIRO Market Surveillance | Suspicious trading patterns that may constitute UMIR violations (manipulation, front running, wash trading, etc.). CIRO has real-time market surveillance capabilities and also relies on Participant reports. | As soon as practicable — typically same day or next business day for clear violations |
| Provincial Securities Commission (OSC/AMF/etc.) | Possible insider trading, tipping, illegal distribution, or other violations of provincial Securities Acts. Also serious fraud or misrepresentation. | Promptly — within days of identifying the concern. May be coordinated with CIRO. |
| FINTRAC (Financial Transactions and Reports Analysis Centre) | Suspicious Transaction Reports (STRs) when there are reasonable grounds to suspect the transaction is related to money laundering or terrorist financing. Large Cash Transaction Reports (LCTRs) for cash transactions of $10,000+. Must also report Terrorist Property. | STRs: within 30 calendar days of detection of suspicious activity (or 3 business days if immediate concern). LCTRs: within 15 calendar days of the transaction. |
| Law enforcement | Criminal violations (fraud, forgery, money laundering) may be reported directly to police or RCMP, in addition to regulatory reports. FINTRAC also shares its analysis with law enforcement. | As appropriate — typically coordinated with legal counsel and compliance |
Types of Orders
Understanding order types is fundamental to executing client instructions accurately and to explaining to clients how their orders will behave in different market conditions. Each order type has specific characteristics, advantages, risks, and appropriate use cases.
A limit order is an instruction to buy or sell a security at a specified price OR BETTER. It sets a maximum price the buyer will pay (buy limit) or a minimum price the seller will accept (sell limit).
Buy Limit Order
- Sets the maximum price the client will pay
- Will only execute at the limit price or LOWER (better for buyer)
- If market price is above the limit: order waits in the queue (rests on the book)
- Example: "Buy 500 shares of TD at $82.00 limit." If TD is trading at $83.50, the order rests until TD falls to $82.00 or below
Sell Limit Order
- Sets the minimum price the client will accept
- Will only execute at the limit price or HIGHER (better for seller)
- If market price is below the limit: order waits in the queue
- Example: "Sell 500 shares of TD at $85.00 limit." If TD is trading at $83.50, the order rests until TD rises to $85.00 or above
| Advantage | Risk | Best Used When |
|---|---|---|
| Price certainty — client cannot pay more (buy) or receive less (sell) than specified | Non-execution risk — if price never reaches the limit, the order may expire unfilled. In fast-moving markets, the investor may miss the trade entirely. | Investor has a specific target price; market conditions are volatile; large orders where market impact is a concern; thinly traded securities |
Limit orders must specify how long they remain active: Day order: expires at end of current trading session if unfilled. Good-till-cancelled (GTC): remains active until filled or explicitly cancelled (most marketplaces cap GTC at 30–90 days). Good-till-date (GTD): remains active until a specified date. Day order is the default if no time in force is specified.
A market order is an instruction to buy or sell a security immediately at the best available price in the market at the time of execution. Speed of execution is prioritized over price certainty.
- Execution guarantee (in liquid markets): Market orders in liquid securities will almost always execute immediately — but at whatever price is available at that moment
- No price guarantee: The client will receive the best available price at execution time — which may differ significantly from the price seen when the order was entered (especially in fast-moving or illiquid markets)
- Bid-ask spread: A market buy order executes at the ASK; a market sell order executes at the BID — the client automatically crosses the spread
- Risk in illiquid securities: In thinly traded stocks, a market order can sweep through multiple price levels — a large market buy could execute at $5.00, $5.20, $5.45, $5.80 as it depletes available sell orders (significant slippage)
| Advantage | Risk | Best Used When |
|---|---|---|
| Certainty of execution — order will fill (in liquid markets). Speed — immediate execution. Simplicity. | No price certainty — can result in significant slippage in volatile or illiquid markets. Market orders should NEVER be used for thinly traded securities. | Highly liquid securities (TSX 60 components); urgent execution needed; small orders where price impact is minimal; closing a position quickly |
An Immediate-or-Cancel (IOC) order instructs the marketplace to execute as much of the order as possible immediately at the specified limit price (or better), and to cancel the unfilled remainder immediately — no portion of the order rests on the book.
- Partial fills accepted: IOC will take whatever is available at the limit price right now — even if that's only 100 of the 10,000 shares ordered. The remaining 9,900 are immediately cancelled.
- No book resting: The order does not rest in the limit order book waiting for future fills — whatever isn't filled immediately is gone
- Use case: Algorithmic traders wanting to quickly take available liquidity at a price without committing to a resting order; traders who want to test available depth without signaling intentions through a visible resting order
A Fill-or-Kill (FOK) order must be executed in its entirety immediately at the specified price or better — or the entire order is cancelled. Unlike IOC, partial fills are NOT acceptable.
- All-or-nothing AND immediate: The order must be completely filled right now — or not at all. Zero tolerance for partial fills or delays
- Use case: Institutional investors who need a guaranteed full block fill (e.g., for an index rebalancing or hedging position) and cannot accept a partial fill that would leave them with unintended exposure
- Example: "Buy 50,000 shares of BCE FOK at $45.50." If the market has 30,000 shares at $45.50 but not 50,000, the entire order is killed
| IOC | FOK | |
|---|---|---|
| Partial fill? | ✅ Yes — unfilled portion cancelled | ❌ No — entire order cancelled if not fully filled |
| Immediate execution required? | ✅ Yes | ✅ Yes |
| Rests on book? | ❌ Never | ❌ Never |
| Best for? | Taking available liquidity quickly; algo trading | Block trades requiring complete execution; hedging precise positions |
A stop order (called "on-stop" in Canadian market terminology) is a conditional order that becomes active — "triggers" — only when the security's market price reaches or passes through a specified stop price. Once triggered, it converts to either a market order or a limit order.
Stop-Loss Order (Most Common Stop)
- Purpose: Limit losses on an existing long position by automatically selling if the price falls to the stop price
- Mechanics: "Sell 1,000 shares of Royal Bank on-stop at $130.00." If RY falls to $130.00, the stop triggers and converts to a market sell order — selling at the best available price at that moment
- Risk: In a fast-falling market, the triggered market order may execute significantly below the stop price ("gap risk"). The client intended to sell at $130.00 but may execute at $127.50 if the stock gaps through the stop on bad news
- Stop-limit order: To manage gap risk, a stop-limit order specifies a stop price AND a limit price: "Sell on-stop at $130.00, limit $128.50." Triggers at $130 but will only execute at $128.50 or better — providing price protection but introducing non-execution risk if the stock gaps past $128.50
Buy Stop Order (Stop to Buy)
- Purpose: Buy a security once it breaks ABOVE a resistance level (momentum entry) OR protect a short position
- Mechanics: "Buy 1,000 shares of Shopify on-stop at $80.00." If SHOP rises to $80.00, triggers and converts to market buy
- Use case: Momentum traders who want to buy a breakout above resistance; short sellers who want to automatically close their short position if the stock rises to a specified level (protecting against unlimited loss)
(1) Gap risk: If a stock gaps through the stop price on overnight news, the triggered market order executes far from the intended stop price. (2) Whipsaw risk: In a volatile but ultimately flat market, a stop might trigger on a temporary dip and sell the position — only for the price to recover. The client is shaken out of a good position by normal market volatility. This is why stop prices should be set below meaningful support levels, not at arbitrary round numbers.
An iceberg order (also called a "reserve order" or "hidden order") displays only a small portion of a large order in the public limit order book, while the remainder is hidden — like the visible tip of an iceberg above the waterline.
- Mechanics: The visible ("peak") portion appears in the public order book at the specified limit price. When the peak is filled, another slice of the hidden reserve automatically replenishes the visible portion — continuing until the entire order is filled
- Example: "Buy 500,000 shares of Enbridge, iceberg with visible peak of 5,000 shares at $50.00." The market sees only 5,000 shares; as each 5,000-share slice fills, another 5,000 appears until all 500,000 are purchased
- Purpose — minimize market impact: A visible order for 500,000 shares would signal to other participants that a large buyer is in the market — causing sellers to raise their prices and other buyers to compete, worsening execution. The iceberg hides the buyer's true size
- Regulatory disclosure: Marketplaces know the full size of iceberg orders (they are visible to the marketplace itself) but do not publicly display the full quantity — they display only the visible peak in public market data feeds
- Priority consideration: The hidden portion of an iceberg order typically loses time priority when it refreshes — a resting visible order may have priority over the refreshed iceberg peak at the same price
A short sale order is an order to sell a security the seller does not own — the seller borrows the shares from another party (via the dealer) and sells them, intending to buy them back (cover) later at a lower price and return them to the lender.
UMIR Rules for Short Sales
- Mandatory marking: Under UMIR, every sell order must be marked either "short" or "long." Dealers must mark all short sale orders as such before routing to the marketplace. Failure to mark a short sale as "short" is a UMIR violation — even if unintentional
- Locate requirement: Before a Participant can accept a client's short sale order, the Participant must have "reasonable grounds to believe" that the securities can be borrowed for delivery on settlement date. Dealers typically satisfy this through locating available stock for borrow before or at order entry
- Tick rule: UMIR (formerly) required that short sales be executed at a price at or above the last different trading price (the "tick test" or "zero plus tick" rule). This restriction was removed for most cases. However, in periods of extreme volatility, circuit breakers and temporary short sale restrictions may still be imposed.
- Settlement — borrowed shares: On settlement date (T+1), the short seller must deliver the borrowed shares (obtained from the stock borrow facility) to the buyer. Failure to deliver creates a "fail" — which has regulatory consequences
- Covering the short: When the client wants to close their short position, they enter a buy order to cover. This order is NOT marked "short" — it is a regular buy order. The purchased shares are returned to the lender.
| Order Type | Summary | Key Feature | Risk Profile |
|---|---|---|---|
| Limit | Buy/sell at specified price or better | Price certainty, no execution certainty | Non-execution risk |
| Market | Execute immediately at best available price | Execution certainty, no price certainty | Slippage risk |
| IOC | Fill immediately what's available, cancel rest | Partial fills OK; no book resting | Partial fill leaves position open |
| FOK | Fill entire order immediately or cancel all | All-or-nothing AND immediate | Non-execution if full fill unavailable |
| On-Stop (Stop) | Triggers when price hits stop price | Conditional — dormant until triggered | Gap risk; whipsaw risk |
| Iceberg | Shows only part of large order | Hides true quantity; minimizes market impact | Priority loss on refresh; execution spread over time |
| Short Sale | Sell borrowed securities expecting price decline | Must be marked "short"; locate required | Unlimited loss; short squeeze; borrow recall |
out of 25 correct