SD-06.4 — Best Execution & Transaction Cost Analysis

Business Domain: BD-06 Trading & Execution (Front office) · Applies: PUB

Purpose

Proves the firm executed in its clients’ best interest, and measures how well the desk traded. Best Execution & Transaction Cost Analysis is the obligation-and-measurement capability of BD-06: it estimates trading cost before the trade, measures realised cost after it, evidences the best-execution obligation to clients and regulators, and feeds the result back into how the desk selects strategies, algorithms, brokers and venues.

Service Operations

Run pre-trade transaction cost analysis — estimate the cost and market impact of a trade, and recommend the venue, mode and algorithm.
Run post-trade transaction cost analysis — measure the realised cost against the benchmark (arrival price, VWAP, participation-weighted price).
Decompose implementation shortfall — attribute the cost into delay, execution and opportunity cost.
Evaluate execution performance — score traders, brokers, algorithms and venues on execution quality.
Run best-execution monitoring and review — monitor against the best-execution obligation and run the periodic review of execution arrangements.
Operate the best-execution committee — the governance forum and its reporting.
Handle trade errors — the identification, correction and escalation of trade errors per the trade policy.

Inputs and outputs

Inputs: the execution records from SD-06.2; market and benchmark data; the venue and broker data from SD-06.3.
Outputs: the transaction-cost-analysis reports, the execution-quality scorecards, the best-execution committee packs and the regulatory reporting — feeding SD-06.3 (broker and venue scorecards), the strategy selection in SD-06.2, and BD-09.

Entities

Consumes: the Execution entity (SD-06.2), Price & Market Data (E-08), Benchmark / Index (E-10); the SD-06.3 venue and broker data.
Owns: none — the transaction-cost-analysis output is an analytical artefact.

Standards

The MiFID II best-execution obligation — ongoing monitoring and the periodic review of execution arrangements — and FINRA Rule 5310 and SEC Rule 606 for the US. The implementation-shortfall framework is the named cost methodology. In quote-driven markets, best-execution evidence rests on competing-quote capture rather than benchmark slippage.

Open extensions

The treatment of best-execution evidence in request-for-quote markets — the number of dealers in competition and the cover price — distinct from order-driven benchmark slippage.
Whether a stored transaction-cost-analysis result warrants an entity, parallel to a performance result.