Best Execution When the Cheap Venue Is Not the Best One
A supervisor reviews order routing for a mid-sized dealer. For a sample week, 71% of retail market orders in a liquid large-cap name were routed to a single venue that pays the firm a per-share rebate. The venue's fill rates are comparable to alternatives, but its average execution price for buys is 1.2 cents worse than the two next-best venues over the same week, and 0.9 cents worse for sells. The routing table was last reviewed 19 months ago. The head of trading says the rebate offsets the price difference and that the venue provides 'reliable liquidity.' A junior analyst's note in the file claims the arrangement is compliant because the firm's written policy lists 'price, speed, and likelihood of execution' as factors and the venue scores well on speed. The supervisor also learns that the trading desk's compensation includes a component tied to net routing revenue.
1. Evaluate whether the routing arrangement is consistent with best execution obligations. What specific evidence would the supervisor need?
Read the worked answer
The arrangement is questionable on its face and cannot be defended by the policy language alone.
Analysis:
- Best execution is about the total consideration to the client, not about which factors the policy happens to list. A venue that is systematically 1.2 cents worse on buys and 0.9 cents worse on sells is worse on the factor that matters most for a liquid large-cap, where speed and fill likelihood are not scarce.
- The rebate is firm revenue, not client benefit. Saying it 'offsets' the price difference is only coherent if the offset flows to the client - it does not.
- The 19-month-old routing table is stale; venue economics and fill quality change.
- The analyst's note is circular: it cites the policy's factor list to conclude compliance without testing whether the chosen venue wins on those factors.
- Desk compensation tied to routing revenue creates an incentive that must be controlled, not merely disclosed.
Evidence needed:
- Venue-by-venue effective spread and price improvement data for the same orders, same week, same size buckets.
- Order-level comparison showing what the same orders would have received at the two next-best venues (not averages alone).
- The routing decision record: who chose the venue, when, on what data.
- Whether any client instructions (e.g., limit orders, directed brokerage) change the analysis for a subset.
- The compensation plan document and how the routing revenue component is calculated.
If the price gap holds after this review, the supervisor should stop or restrict the routing, remediate affected clients where calculable, and escalate the compensation conflict.
2. The firm wants to keep the rebate venue but add disclosure. Is disclosure sufficient? What supervisory action is appropriate?
Read the worked answer
Disclosure is necessary but not sufficient. Best execution is an obligation, not a consent regime - a client cannot be asked to waive it by disclosure, and disclosure does not convert a worse execution into a better one.
Why disclosure alone fails here:
- The harm is quantifiable and recurring (roughly a cent per share on most retail market orders).
- The conflict is structural (compensation), so it will persist after disclosure.
- Regulators expect routing to be evaluated, not just described.
Appropriate supervisory action:
- Suspend or cap routing to the venue pending a documented best-execution review, or require the desk to justify each order class where the venue is used.
- Commission the review described above with a deadline; require periodic (at least annual, preferably quarterly) routing-table review with written rationale.
- Fix the file: the analyst's note should be replaced with an analysis that actually compares venues on the factors the policy names.
- Address compensation: either remove routing revenue from desk compensation or add a control (e.g., independent routing oversight, a best-execution committee with authority to override).
- Consider remediation for clients whose orders were routed to the worse venue during the period, if the gap is reliably measurable.
- Document the decision and the reasoning, including why the rebate was or was not treated as a client benefit.
Disclosure can accompany these steps but cannot substitute for them.