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Algorithm
A deterministic procedure that converts defined inputs into outputs.
Lesson · Algorithmic and Automated Trading
Algorithmic and Automated Trading Fundamentals
Separate strategy rules, signal generation, risk checks, order submission, and execution, then choose the appropriate level of automation.
Core concepts
What to understand
Keep the boundaries, state, and authority explicit.
2
Automation level
Alert-only, approval-required, and automatic execution have different operational risk.
3
Control boundary
Risk checks must remain independent from the strategy that requests the trade.
Interactive lab
Automation Pipeline Lab
Change the market regime, automation level, data delay, and risk gate. Observe signals, approvals, and orders.
Automation Pipeline Lab
Deterministic synthetic educational data · no broker or live-market connection
SYSTEM MODEL
Process
Keep the trading-system pipeline explicit
Each stage should have one responsibility and a recorded result.
Observe
Receive validated market data and update strategy state.
Decide
Generate a signal and apply portfolio and risk checks.
Act
Alert, request approval, or submit an order through the broker adapter.
Knowledge check
Check your understanding
Select one answer for each question. Feedback appears immediately, and a wrong choice is answered on its own terms before the rule is restated.
1. What does automation add to a strategy?
Automation executes defined logic more consistently; it does not guarantee the logic has an edge.
2. Which component should be able to block a valid strategy signal?
A signal can be valid while the proposed trade violates account or portfolio limits.
3. A strategy has one week of paper evidence and a kill switch that has never been tested. Which automation level fits?
Authority is granted in stages. Alert-only and approval keep a person between the gate and the broker while the evidence and the controls catch up.
4. A rule fires 5 times in a session; the feed is 2 s old against a 3 s limit; the daily limit is 2 new positions; automation is alert-only. How many orders are submitted?
Signals 5 → risk gate passes 2 (fresh, daily limit 2) → alert-only sends 2 alerts and 0 orders. The level decides the last step and nothing before it.
Practical rules
- Separate data, strategy, risk, and execution responsibilities.
- Record every stage from market event to broker response.
- Start with alerts or approval before enabling automatic orders.
Common mistakes
- Calling a scheduled script a complete trading system.
- Letting the strategy bypass pre-trade risk checks.
- Assuming faster automation improves a weak strategy.
References
Official reading
These sources cover algorithmic controls, market access, broker APIs, system operations, or security.
FINRA · Regulatory Notice 15-09
Official guidance on supervision, testing, controls, documentation, and monitoring for algorithmic trading strategies.
SEC · Rule 15c3-5 Market Access Controls
Official rule overview describing pre-trade financial and regulatory risk controls for broker-dealers with market access.