Best Execution: Definition + Case Study

Best Execution

The obligation to take reasonable efforts to achieve the most advantageous execution for clients.

Definition

Under UMIR and CIRO IDPC Rules 3120-3129, dealers must use reasonable efforts to achieve best execution for client orders. Best execution considers price, speed, certainty of execution, and overall transaction cost - not just the lowest price for a buy or highest for a sell. Best price is a separate, stricter UMIR rule that applies to certain protected orders.

Source

UMIR; CIRO IDPC Rules 3120-3129; NI 23-101

Where this shows up on the CIRE

Outcome 8.1

Test yourself

Two real CIRE-bank questions on this exact outcome. Click to reveal the answer and the rule citation.

1
A mining company executive knows that an internal assay report confirming a major ore discovery has not yet been publicly released. She calls her registrant and places a large buy order in the company's shares. Under Canadian securities law, which of the following is most accurate?
Outcome 8.1 · click for answer
A.The trade is permissible because the executive's account is at an arm's-length dealer and the order was placed verbally.
B.The prohibition applies only if the executive is a director or officer of a reporting issuer; a senior employee does not qualify as an insider.
C.The trade is permissible because the executive is buying, not selling, her own company's shares.
D.The executive is trading on material non-public information and the trade is prohibited under insider trading provisions of applicable securities legislation; the registrant who knowingly facilitates such a trade may also face liability.Correct
Insider trading prohibitions under provincial securities legislation apply to any person in a special relationship with a reporting issuer who trades with knowledge of a material fact or material change that has not been generally disclosed. Senior employees such as executives fall squarely within this definition. The prohibition applies equally to purchases and sales. A registrant who knowingly facilitates insider trading may be found to have tipped or assisted the insider, attracting their own regulatory and civil liability.
2
A client buys one call option on shares of a Canadian bank with a strike price of $130 and an expiry of three months. The current share price is $128. Which statement correctly describes the client's position at expiry if the shares are trading at $125?
Outcome 8.1 · click for answer
A.The client is obligated to buy the shares at $130 since call buyers must exercise at expiry
B.The call expires worthless since $125 is below the $130 strike, capping the loss at the premiumCorrect
C.The call is in the money here and the client collects $5 per share at settlement
D.The position converts automatically into shares because this is an American-style option
A call option gives the holder the right; not the obligation; to buy the underlying at the strike price. At expiry with the stock trading at $125, exercising the call to buy at $130 would be economically irrational (the client could buy shares in the market for $125). An out-of-the-money call expires worthless. The buyer's maximum loss is the premium paid. A call buyer has the right to buy; a call seller (writer) has the obligation to sell. Automatic conversion to shares occurs only for deep-in-the-money options under some brokerage exercise-by-exception rules, which does not apply here.

AI case study

See how Best Execution applies in practice

One named-role scenario with realistic numbers and the rule citation.

Want this kind of explanation on every wrong answer?

The Registrant Prep AI tutor is grounded in the same primary sources cited above. Every wrong practice answer gets the rule that the distractor was testing.

Try the free mock exam See pricing