# How Does MiFID II Define an Algorithmic Trading Technique? ▴ Question

**Published:** 2025-08-12
**Categories:** Question

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## Concept

The Markets in Financial Instruments Directive II (MiFID II) establishes a precise and functional definition for [algorithmic trading](https://prime.greeks.live/area/algorithmic-trading/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite), moving the concept from a loosely understood industry term to a regulated activity with specific compliance boundaries. At its core, the framework identifies algorithmic trading as the use of computer algorithms to automatically determine the parameters of an order with minimal or no [human intervention](https://prime.greeks.live/question/can-automated-hedging-systems-react-to-cross-default-triggers-before-human-intervention-becomes-possible/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite). This definition is foundational to understanding the regulatory intent, which centers on managing the systemic risks introduced by the speed and complexity of automated trading systems. The directive’s language is calibrated to capture the decision-making autonomy of the software itself.

Under Article 4(1)(39) of [MiFID II](https://prime.greeks.live/area/mifid-ii/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite), an algorithmic trading technique is specified as “trading in financial instruments where a computer algorithm automatically determines individual parameters of orders such as whether to initiate the order, the timing, price or quantity of the order or how to manage the order after its submission, with limited or no human intervention”. This definition deliberately casts a wide net, encompassing a range of automated activities. The critical element is the algorithm’s role in making deterministic choices about the order’s lifecycle. A system is considered to have “limited or no human intervention” when it automates decisions at any stage, from initiation and generation to routing and execution, based on pre-set parameters.

> MiFID II’s definition of algorithmic trading focuses on the automation of order parameters, creating a clear distinction between simple execution routing and autonomous trading logic.

The regulation also carves out specific exclusions to sharpen the definition’s focus. A system is not considered to be engaging in algorithmic trading if its function is solely for routing orders to trading venues, processing orders without determining any trading parameters, confirming orders, or managing post-trade processing. This distinction is vital; it separates sophisticated trading logic from more basic forms of automation. For instance, a [Smart Order Router](https://prime.greeks.live/area/smart-order-router/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) (SOR) that only selects a destination for an order is outside the scope, but if that SOR uses an algorithm to determine parameters beyond the venue, it falls under the algorithmic trading definition.

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## Strategy

The strategic implications of MiFID II’s definition of algorithmic trading are significant, compelling firms to dissect their execution workflows and classify them with regulatory precision. The directive effectively creates a taxonomy of automated trading, with each classification carrying its own set of obligations. This forces a strategic evaluation of not just the tools a firm uses, but how they are deployed within the firm’s operational and risk management framework. The two primary categories that emerge are [general algorithmic trading](https://prime.greeks.live/question/how-does-mifid-ii-distinguish-between-general-algorithmic-trading-and-high-frequency-trading/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) and the more specialized [high-frequency algorithmic trading](https://prime.greeks.live/question/how-do-high-frequency-trading-and-algorithmic-execution-influence-the-frequency-of-strategic-rejections/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) (HFT).

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## Delineating High-Frequency Techniques

MiFID II isolates high-frequency algorithmic trading as a specific subset that presents a heightened level of systemic risk due to its speed and message volume. An HFT technique is characterized by its infrastructure, which is designed to minimize network and other latencies through co-location, proximity hosting, or high-speed [direct electronic access](https://prime.greeks.live/area/direct-electronic-access/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite). Another defining feature is the system’s ability to initiate, generate, route, or execute orders without any human intervention for individual trades.

Finally, the generation of a high volume of intraday messages, including orders, quotes, or cancellations, is a key identifier. A “high message intraday rate” is quantitatively defined, for instance, as submitting an average of at least two messages per second for a single financial instrument on a [trading venue](https://prime.greeks.live/question/what-are-the-core-differences-in-data-requirements-for-on-venue-versus-off-venue-reports/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite).

This granular definition requires firms to assess their technological infrastructure and trading patterns against specific thresholds. The strategic decision to engage in HFT [under MiFID](https://prime.greeks.live/question/what-are-the-operational-consequences-of-misreporting-under-mifid-ii-versus-a-reporting-failure-under-emir/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) II is therefore a commitment to a higher regulatory standard, including more stringent systems and controls, testing protocols, and business continuity planning.

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## Market Making Obligations

A significant strategic consideration for firms engaged in algorithmic trading is whether their activities constitute a market-making strategy. MiFID II provides a clear definition for this as well. A firm is considered to be pursuing a market-making strategy if it deals on its own account by posting firm, simultaneous two-way quotes of comparable size at competitive prices. This activity must result in providing liquidity on a regular and frequent basis.

To formalize this, the directive specifies that this [market making](https://prime.greeks.live/area/market-making/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) must be carried out continuously during a specified portion of the trading day. Firms whose algorithmic strategies meet these criteria are required to enter into a binding written agreement with the trading venue, specifying their market-making obligations.

The table below outlines the key definitional distinctions and their strategic implications:

### MiFID II Algorithmic Trading Classifications

| Trading Category | Defining Characteristics | Key Strategic Obligation |
| --- | --- | --- |
| General Algorithmic Trading | Automated determination of order parameters (initiation, timing, price, quantity) with limited human intervention. | Notification to national regulators, implementation of systems and risk controls (e.g. price collars, kill functionality). |
| High-Frequency Algorithmic Trading (HFT) | A subset of algorithmic trading characterized by low-latency infrastructure, no human intervention for individual orders, and high intraday message rates. | Adherence to more stringent system resilience and capacity requirements, including specific testing and monitoring protocols. |
| Algorithmic Market Making | Posting simultaneous, two-way quotes for a significant portion of the trading day to provide liquidity. | Formal written agreement with the trading venue outlining market-making duties and continuous liquidity provision. |

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## Execution

For firms operating under MiFID II, the execution of an algorithmic trading strategy is contingent upon a robust and compliant operational framework. The directive moves beyond definitions to mandate specific, tangible controls that must be embedded within a firm’s trading systems. These requirements are designed to ensure the resilience of trading venues, prevent disorderly market conditions, and provide regulators with clear oversight of automated trading activities. The execution framework under MiFID II can be broken down into several key pillars ▴ systems and [risk controls](https://prime.greeks.live/area/risk-controls/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite), testing and capacity, and transparency and record-keeping.

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## Systems and Risk Controls

A cornerstone of the MiFID II framework is the requirement for firms to implement effective systems and risk controls. These are not abstract guidelines but concrete functionalities that must be integrated into the trading architecture. Key controls include:

- **[Pre-Trade Controls](https://prime.greeks.live/area/pre-trade-controls/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite)** ▴ These are automated checks that occur before an order is submitted to a trading venue. They include price collars to prevent erroneous orders, maximum order values, and overall position limits.

- **[Order Cancellation](https://prime.greeks.live/area/order-cancellation/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) and Monitoring** ▴ Firms must have the ability to monitor their trading activity in real-time and possess a reliable “kill switch” or emergency stop functionality. This allows for the immediate cancellation of all outstanding orders from a specific trader or algorithm, a critical tool for preventing runaway algorithms from destabilizing the market.

- **Resilience and Capacity** ▴ Systems must be designed to be resilient and have adequate capacity to handle the stress of peak trading volumes. This involves having redundant systems and effective business continuity plans to manage potential disruptions.

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## Testing and Capacity Management

MiFID II mandates a rigorous approach to system testing. Firms cannot simply deploy algorithms; they must be able to demonstrate that their systems have been thoroughly tested in a controlled environment before they are used in live markets. This includes testing the algorithm’s performance under various market conditions and its interaction with the firm’s risk controls. Capacity planning is also a critical element.

Firms must ensure their systems can handle message rates up to their specified limits without compromising performance. This often involves detailed capacity planning and regular stress testing of the entire trading infrastructure.

The following table provides an overview of the testing and control requirements for different types of algorithmic trading activities:

### MiFID II Execution and Control Requirements

| Control Area | Requirement for General Algorithmic Trading | Additional Requirement for HFT |
| --- | --- | --- |
| System Testing | Mandatory testing of algorithms and risk controls in a non-production environment. | More extensive testing to demonstrate system resilience under high-volume and high-volatility scenarios. |
| Capacity Planning | Systems must be scalable and able to handle peak trading volumes. | Demonstrable capacity to handle message rates up to twice the firm’s usual rate without performance degradation. |
| Risk Controls | Implementation of pre-trade controls (price collars, size limits) and real-time monitoring. | Automated “kill functionality” is mandatory, along with more granular monitoring of message traffic. |

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## Transparency and Record-Keeping

A final pillar of the execution framework is transparency. MiFID II introduces requirements for flagging orders generated by algorithms. This allows regulators to distinguish between human-initiated and algorithm-initiated trades, providing a clearer picture of market dynamics.

Firms are also obligated to maintain detailed records of their algorithmic trading strategies, including the parameters of the algorithms, the testing methodologies used, and records of any significant changes to the algorithms. This detailed audit trail is essential for regulatory oversight and for post-incident analysis.

- **Algorithm Identification** ▴ Every order generated by an algorithm must be flagged as such when submitted to a trading venue.

- **Strategy Documentation** ▴ Firms must maintain comprehensive documentation for each algorithmic strategy, detailing its design, parameters, and risk controls.

- **Trade and Order Records** ▴ Detailed records of all orders and trades must be kept, allowing for a complete reconstruction of trading activity.

> The operational reality of MiFID II is that it transforms algorithmic trading from a black-box activity into a transparent, controlled, and auditable process.

The successful execution of an algorithmic trading strategy under MiFID II, therefore, depends on a firm’s ability to build and maintain a sophisticated operational infrastructure. This infrastructure must not only support the trading logic of the algorithms but also embed the necessary risk controls, testing protocols, and transparency mechanisms to ensure full compliance with the directive’s requirements.

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## References

- Dechert LLP. “MiFID II – Algorithmic trading.” Dechert LLP, 2017.

- Hogan Lovells. “MiFID II.” Hogan Lovells, 2016.

- Trading Technologies. “MiFID II and Algorithmic Trading ▴ What You Need to Know Now.” Trading Technologies, 2017.

- Emissions-EUETS.com. “Algorithmic trading.” Emissions-EUETS.com, 2024.

- “Algo and High Frequency Trading under MiFID2 – a few more pieces in the puzzle.” Simmons & Simmons, 2016.

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## Reflection

The integration of MiFID II’s definition of algorithmic trading into a firm’s operational DNA is a complex undertaking. It requires a shift in perspective, viewing regulatory compliance not as a set of constraints but as a framework for building more resilient and intelligent trading systems. The directive’s emphasis on transparency and control provides an opportunity to enhance operational robustness and gain a deeper understanding of one’s own trading footprint.

As markets continue to evolve, the principles embedded in MiFID II will likely serve as a foundational layer for future regulatory frameworks. The ultimate advantage will lie with those firms that have internalized these principles and built them into the very fabric of their trading architecture.

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## Glossary

<a href="https://prime.greeks.live/area/algorithmic-trading/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Algorithmic Trading

Meaning ▴ Algorithmic trading is the automated execution of financial orders using predefined computational rules and logic, typically designed to capitalize on market inefficiencies, manage large order flow, or achieve specific execution objectives with minimal market impact. </a><a href="https://prime.greeks.live/question/can-automated-hedging-systems-react-to-cross-default-triggers-before-human-intervention-becomes-possible/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Human Intervention

Automated hedging systems react to cross-default triggers at near-light speed, executing pre-defined protocols before human cognition begins. </a><a href="https://prime.greeks.live/area/mifid-ii/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Mifid Ii

Meaning ▴ MiFID II, the Markets in Financial Instruments Directive II, constitutes a comprehensive regulatory framework enacted by the European Union to govern financial markets, investment firms, and trading venues. </a><a href="https://prime.greeks.live/area/smart-order-router/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Smart Order Router

Meaning ▴ A Smart Order Router (SOR) is an algorithmic trading mechanism designed to optimize order execution by intelligently routing trade instructions across multiple liquidity venues. </a><a href="https://prime.greeks.live/question/how-do-high-frequency-trading-and-algorithmic-execution-influence-the-frequency-of-strategic-rejections/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## High-Frequency Algorithmic Trading

HFT and algorithmic execution increase strategic rejections by making the market's risk controls and counterparty defenses operate at microsecond speeds. </a><a href="https://prime.greeks.live/question/how-does-mifid-ii-distinguish-between-general-algorithmic-trading-and-high-frequency-trading/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## General Algorithmic Trading

MiFID II defines HFT as a subset of algorithmic trading based on infrastructure, automation, and high message rates, not by strategy. </a><a href="https://prime.greeks.live/area/direct-electronic-access/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Direct Electronic Access

Meaning ▴ Direct Electronic Access (DEA) denotes a facility enabling institutional clients to transmit orders directly to an exchange or trading venue's matching engine, bypassing a broker's manual intervention layer. </a><a href="https://prime.greeks.live/question/what-are-the-core-differences-in-data-requirements-for-on-venue-versus-off-venue-reports/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Trading Venue

On-venue data is a standardized, public utility from a central system; off-venue data is a private record requiring complex assembly. </a><a href="https://prime.greeks.live/question/what-are-the-operational-consequences-of-misreporting-under-mifid-ii-versus-a-reporting-failure-under-emir/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Under Mifid

A MiFID II misreport corrupts market surveillance data; an EMIR failure hides systemic risk, creating distinct operational and reputational threats. </a><a href="https://prime.greeks.live/area/market-making/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Market Making

Meaning ▴ Market Making is a systematic trading strategy where a participant simultaneously quotes both bid and ask prices for a financial instrument, aiming to profit from the bid-ask spread. </a><a href="https://prime.greeks.live/area/risk-controls/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Risk Controls

Meaning ▴ Risk Controls constitute the programmatic and procedural frameworks designed to identify, measure, monitor, and mitigate exposure to various forms of financial and operational risk within institutional digital asset trading environments. </a><a href="https://prime.greeks.live/area/pre-trade-controls/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Pre-Trade Controls

Meaning ▴ Pre-Trade Controls are automated system mechanisms designed to validate and enforce predefined risk and compliance rules on order instructions prior to their submission to an execution venue. </a><a href="https://prime.greeks.live/area/order-cancellation/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Order Cancellation

Meaning ▴ Order cancellation constitutes the formal instruction to remove an active, unexecuted order from an exchange or matching engine's order book prior to its full or partial fill. </a>

**Tags:** [Systems and Risk Controls](https://options.greeks.live/area/systems-and-risk-controls/), [Market Making](https://options.greeks.live/area/market-making/), [Kill Functionality](https://options.greeks.live/area/kill-functionality/), [Algorithmic Trading](https://options.greeks.live/area/algorithmic-trading/), [High-Frequency Trading](https://options.greeks.live/area/high-frequency-trading/), [Order Cancellation](https://options.greeks.live/area/order-cancellation/)	

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- 
### [How Does the Analysis of RTS 27 and RTS 28 Data Inform the Strategic Decisions of a Best Execution Committee?](https://options.greeks.live/question/how-does-the-analysis-of-rts-27-and-rts-28-data-inform-the-strategic-decisions-of-a-best-execution-committee/)
![A sleek metallic teal execution engine, representing a Crypto Derivatives OS, interfaces with a luminous pre-trade analytics display. This abstract view depicts institutional RFQ protocols enabling high-fidelity execution for multi-leg spreads, optimizing market microstructure and atomic settlement.](https://options.greeks.live/wp-content/uploads/2025/07/advanced-institutional-digital-asset-derivatives-rfq-protocol-engine-for-high-fidelity-execution-and-market-microstructure-analysis.jpg)

RTS 27/28 analysis provides the empirical evidence for a Best Execution Committee to validate and optimize venue selection and strategy.

- 
### [What Are the Primary Challenges to Implementing Fully Transparent Algorithmic Trading Systems?](https://options.greeks.live/question/what-are-the-primary-challenges-to-implementing-fully-transparent-algorithmic-trading-systems/)
![A transparent glass sphere rests precisely on a metallic rod, connecting a grey structural element and a dark teal engineered module with a clear lens. This symbolizes atomic settlement of digital asset derivatives via private quotation within a Prime RFQ, showcasing high-fidelity execution and capital efficiency for RFQ protocols and liquidity aggregation.](https://options.greeks.live/wp-content/uploads/2025/07/architecting-high-fidelity-execution-for-institutional-digital-asset-derivatives-rfq-protocols-and-systemic-liquidity-aggregation.jpg)

Implementing transparent algorithmic trading requires reconciling the need for IP secrecy with market integrity through auditable, explainable systems.

- 
### [What Are the Regulatory Implications of a Large-Scale Failure in an Automated Hedging Protocol?](https://options.greeks.live/question/what-are-the-regulatory-implications-of-a-large-scale-failure-in-an-automated-hedging-protocol/)
![Precision mechanics illustrating institutional RFQ protocol dynamics. Metallic and blue blades symbolize principal's bids and counterparty responses, pivoting on a central matching engine. This visualizes high-fidelity execution and price discovery for digital asset derivatives, emphasizing low latency and capital efficiency.](https://options.greeks.live/wp-content/uploads/2025/07/precision-institutional-digital-asset-derivatives-rfq-execution-engine-microstructure.jpg)

A large-scale automated hedging failure triggers a forensic regulatory response focused on containment, accountability, and systemic resilience.

- 
### [How Do Regulatory Changes like MiFID II Impact the Design and Use of Smart Trading Tools?](https://options.greeks.live/question/how-do-regulatory-changes-like-mifid-ii-impact-the-design-and-use-of-smart-trading-tools/)
![An intricate mechanical assembly reveals the market microstructure of an institutional-grade RFQ protocol engine. It visualizes high-fidelity execution for digital asset derivatives block trades, managing counterparty risk and multi-leg spread strategies within a liquidity pool, embodying a Prime RFQ.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-protocol-engine-architecture.jpg)

MiFID II reshaped smart trading tools by embedding auditable proof of best execution and systemic risk controls into their core design.

- 
### [How Does MiFID II Specifically Impact Algorithmic Trading Strategies in Europe?](https://options.greeks.live/question/how-does-mifid-ii-specifically-impact-algorithmic-trading-strategies-in-europe/)
![Precision-engineered beige and teal conduits intersect against a dark void, symbolizing a Prime RFQ protocol interface. Transparent structural elements suggest multi-leg spread connectivity and high-fidelity execution pathways for institutional digital asset derivatives. This visual emphasizes atomic settlement, capital efficiency, and market microstructure dynamics for price discovery.](https://options.greeks.live/wp-content/uploads/2025/07/insti-grade-digital-asset-derivatives-rfq-protocols-multi-leg-execution-junction.jpg)

MiFID II reshaped European algorithmic trading by mandating rigorous testing, transparent execution, and direct accountability for all automated strategies.

- 
### [How Should Algorithmic Trading Strategies Adapt to a Fragmented Liquidity Landscape in Europe?](https://options.greeks.live/question/how-should-algorithmic-trading-strategies-adapt-to-a-fragmented-liquidity-landscape-in-europe/)
![A transparent geometric object, an analogue for multi-leg spreads, rests on a dual-toned reflective surface. Its sharp facets symbolize high-fidelity execution, price discovery, and market microstructure. This embodies RFQ protocols, liquidity aggregation, and capital efficiency in a Prime RFQ.](https://options.greeks.live/wp-content/uploads/2025/07/prime-os-rfq-digital-asset-derivatives-high-fidelity-execution.jpg)

Algorithmic adaptation to Europe's fragmented liquidity requires a multi-venue, system-level architecture.

- 
### [What Are the Primary Regulatory Hurdles When Deploying Black Box Trading Models?](https://options.greeks.live/question/what-are-the-primary-regulatory-hurdles-when-deploying-black-box-trading-models/)
![Abstractly depicting an institutional digital asset derivatives trading system. Intersecting beams symbolize cross-asset strategies and high-fidelity execution pathways, integrating a central, translucent disc representing deep liquidity aggregation. Black modules denote precise RFQ protocols and algorithmic trading components, optimizing market microstructure for principal trading.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-ecosystem-unifying-rfq-protocols-for-high-fidelity-execution-and-deep-liquidity-aggregation-across-multi-leg-spreads.jpg)

Navigating black box trading regulation requires engineering a verifiable system of governance, testing, and real-time risk controls.

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---

**Original URL:** https://options.greeks.live/question/how-does-mifid-ii-define-an-algorithmic-trading-technique/
