Trade Execution

Reach for this when you're building or evaluating execution infrastructure that needs to satisfy best execution obligations under FINRA Rule 5310 or RIA fiduciary duty. It covers the mechanics of smart order routing across exchanges and dark pools, algorithm selection (VWAP, TWAP, implementation shortfall), and transaction cost analysis for both pre-trade estimation and post-trade measurement. The material goes deep on regulatory compliance mechanics like interpreting Rule 605/606 reports and running best execution committee reviews, plus market microstructure concepts like bid-ask spread decomposition and market impact. Also handles fixed income and ETF execution via RFQ protocols, which is less commonly documented elsewhere.

skills.sh installs: 739
GitHub stars: 224
last updated: Aug 21, 2026

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Install

$ npx -y skills add joellewis/finance_skills --skill trade-execution --agent claude-code

Installs into .claude/skills of the current project.

Files

Trade Execution

Core Concepts

Best Execution Obligation

Best execution is the duty to seek the most favorable terms reasonably available for client transactions under the circumstances. The obligation applies differently depending on the entity type and regulatory framework.

Broker-dealer obligations (FINRA Rule 5310): FINRA Rule 5310 (Best Execution and Interpositioning) requires broker-dealers to use reasonable diligence to ascertain the best market for a security and to buy or sell in that market so that the resultant price to the customer is as favorable as possible under prevailing market conditions. "Reasonable diligence" involves consideration of:

The character of the market for the security (e.g., price, volatility, and relative liquidity)
The size and type of transaction
The number of markets checked
The accessibility of the quotation
The terms and conditions of the order as communicated to the broker-dealer

SKILL.md on GitHub