Under FINRA Rule 5310 on best execution, what does a member firm's core obligation require when handling a customer order?
- ATo route every customer order to the exchange that lists the security, regardless of the price available elsewhere.
- BTo guarantee the customer the national best bid or offer displayed at the exact instant the order is entered.
- CTo use reasonable diligence to ascertain the best market and obtain a price as favourable as possible under prevailing conditions. Correct
- DTo execute the order only as principal so the firm can control the markup and improve the customer's net price.
Why A is wrong: Best execution is market-neutral and does not mandate the listing exchange. Rule 5310 asks the firm to compare markets, so a fixed routing rule ignoring price conflicts with the standard.
Why B is wrong: The rule sets a diligence standard, not a guarantee of a specific displayed price. Best execution considers several factors, so promising the NBBO at a single instant overstates the duty.
Why C is correct: Rule 5310 requires reasonable diligence to determine the best market for the security so the resulting price is as favourable as possible for the customer given current market conditions.
Why D is wrong: Best execution does not require a principal capacity, and trading as principal does not by itself satisfy the duty. The obligation is about diligence across markets, not about how the firm is compensated.