Best execution
What is Best execution?
Best execution is the duty or process of seeking the most favorable reasonably available overall trading result for clients under the applicable circumstances.
Execution analysis should compare like orders using arrival conditions, size, urgency, venue, spread, market movement, opportunity cost, fees, and reliability. The cheapest commission is not necessarily the best result. Reviews should include canceled and unfilled orders so routing quality is not flattered by selection bias.
Where comparable market data are unavailable, qualitative evidence and documented dealer competition remain important, especially for bonds, derivatives, private transactions, and stressed markets. Reviews should also test whether repeated use of one counterparty reflects genuine client benefit, operational convenience, limited access, or an unmanaged commercial conflict.
More than price
Relevant factors can include price, spread, fees, speed, likelihood and size of execution, settlement, market impact, information leakage, order type, and client instruction. Their importance depends on asset, order, urgency, and market conditions. Best execution does not mean obtaining the best imaginable price on every trade or using the cheapest broker.
Broker and venue selection
Managers assess broker capability, financial condition, liquidity access, algorithms, research arrangements, operational reliability, errors, and conflicts. Order routing can involve exchanges, dealers, electronic platforms, auctions, or internalization. Payment, rebates, affiliated venues, and bundled services require controls so the manager's benefit does not displace the client's execution interest.
Measurement
Transaction-cost analysis can compare fills with arrival price, midpoint, volume-weighted average, close, or implementation shortfall. Each benchmark has limitations and should match the decision. Small samples and market movement make single-trade judgment unreliable, while aggregate averages can hide poor results for illiquid or disadvantaged order types.
Governance and review
A policy defines responsibilities, approved counterparties, routing, monitoring, exceptions, conflicts, and reporting. Committees should review quantitative and qualitative evidence, venue changes, outages, complaints, and outliers. Client instructions can constrain choices but should be documented. Delegating trading requires oversight of the delegate's process and outcomes.
Practical analysis
Preserve decision, release, arrival, fill, and completion data with quotes, fees, venue, rejects, partial fills, and cancellations. Segment results by asset, size, liquidity, urgency, and broker. Investigate patterns rather than rewarding favorable random movement. Reassess relationships periodically and document why selected arrangements remain reasonably designed for client outcomes.
Sources and further reading
- Commission Guidance Regarding Client Commission Practices Under Section 28(e), U.S. Securities and Exchange Commission
- Investment Advisers: What You Need to Know, U.S. Securities and Exchange Commission