# How Does the SI Best Execution Obligation Differ from That of an Agency Broker? ▴ Question

**Published:** 2025-08-05
**Categories:** Question

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## Concept

The distinction between the [best execution](https://prime.greeks.live/area/best-execution/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) obligation of a [Systematic Internaliser](https://prime.greeks.live/area/systematic-internaliser/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) (SI) and that of an agency broker is a direct function of their foundational roles within the market’s architecture. An SI operates as a principal, executing client orders against its own book. Its primary duty is to the integrity of its own quoted price.

In contrast, an [agency broker](https://prime.greeks.live/area/agency-broker/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) acts purely as an agent, with a fiduciary responsibility to navigate the entire market landscape to secure the most favorable terms for its client. This structural difference creates two distinct, yet parallel, universes of execution responsibility, both governed by the principles of [MiFID II](https://prime.greeks.live/area/mifid-ii/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) but manifested through different operational pressures and objectives.

An SI’s obligation is fundamentally centered on the prices it publicizes. Under the MiFID II framework, an SI is a firm that deals on its own account by executing client orders outside a regulated market or multilateral trading facility (MTF) on an organized, frequent, and systematic basis. When a client order is received, the SI’s [best execution duty](https://prime.greeks.live/area/best-execution-duty/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) is to provide the best possible result, which is most often benchmarked against its own firm quotes. The critical point is that the SI is the execution venue.

Its universe of “best execution” is its own inventory and pricing engine. The obligation is to ensure that the price offered to the client is fair and reasonable in relation to prevailing market conditions, but it is not required to look outside its own system for a better price.

> The core operational mandate of a Systematic Internaliser is to provide liquidity and price improvement against its own capital, defining its best execution duty within the context of its own quotes.

Conversely, an agency broker’s obligation is defined by its breadth of market access and its duty to the client above all else. The agency broker does not trade for its own account; it is a conduit to the market. Its best execution responsibility requires it to take all sufficient steps to obtain the best possible result for its clients, considering a wide array of factors including price, costs, speed, likelihood of execution, and size of the order. This necessitates a comprehensive and dynamic survey of multiple execution venues, including regulated markets, MTFs, other SIs, and alternative liquidity pools.

The agency broker’s value is derived from its sophisticated routing logic and its ability to intelligently source liquidity across a fragmented market landscape. Its obligation is outward-facing, demanding a continuous and evidence-based process of venue selection and order routing to fulfill its client’s mandate.

![Precision instrument with multi-layered dial, symbolizing price discovery and volatility surface calibration. Its metallic arm signifies an algorithmic trading engine, enabling high-fidelity execution for RFQ block trades, minimizing slippage within an institutional Prime RFQ for digital asset derivatives](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-trading-platform-calibrating-rfq-protocols-for-high-fidelity-execution-and-market-microstructure-optimization.jpg)

![A precision-engineered, multi-layered system architecture for institutional digital asset derivatives. Its modular components signify robust RFQ protocol integration, facilitating efficient price discovery and high-fidelity execution for complex multi-leg spreads, minimizing slippage and adverse selection in market microstructure](https://options.greeks.live/wp-content/uploads/2025/07/prime-os-institutional-digital-asset-derivatives-rfq-execution-platform.jpg)

## Strategy

The strategic frameworks for fulfilling best execution diverge significantly between a Systematic Internaliser and an agency broker, reflecting their opposing positions as principal and agent. The SI’s strategy is fundamentally one of internalized risk management and competitive pricing, while the agency broker’s strategy is one of external market navigation and algorithmic optimization. Each must build a sophisticated operational system, but the design principles of these systems are oriented toward different goals.

![An institutional-grade platform's RFQ protocol interface, with a price discovery engine and precision guides, enables high-fidelity execution for digital asset derivatives. Integrated controls optimize market microstructure and liquidity aggregation within a Principal's operational framework](https://options.greeks.live/wp-content/uploads/2025/07/proprietary-institutional-digital-asset-derivatives-rfq-protocol-engine-facilitating-high-fidelity-execution-and-granular-market-microstructure-analysis-for-prime-os.jpg)

## Systematic Internaliser Strategic Framework

For an SI, the core strategy revolves around managing its own balance sheet and providing quotes that are attractive enough to capture order flow while managing the resulting risk. The SI profits from the bid-ask spread and its ability to manage inventory. Its best execution strategy is therefore integrated with its overall business model.

- **Price Formation** ▴ The SI must develop a robust internal pricing engine. This engine ingests real-time data from various lit venues to generate its own proprietary quotes. The strategy is to offer prices that are at, or better than, the European Best Bid and Offer (EBBO), thereby demonstrating [price improvement](https://prime.greeks.live/area/price-improvement/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) and fulfilling its best execution duty.

- **Risk Management** ▴ Every trade an SI takes on is a risk position. Consequently, its strategy involves sophisticated real-time risk models to manage inventory. It may hedge its positions on other venues, but the initial execution is against its own book. The willingness to quote for certain sizes and instruments is a direct function of its capacity to absorb and manage this risk.

- **Client Segmentation** ▴ SIs often segment their client base. They may offer more competitive pricing or larger size capacity to certain clients based on the nature of their order flow (e.g. less “toxic” flow that has lower adverse selection risk). This segmentation is a key part of their profitability and risk management strategy.

![A precision-engineered interface for institutional digital asset derivatives. A circular system component, perhaps an Execution Management System EMS module, connects via a multi-faceted Request for Quote RFQ protocol bridge to a distinct teal capsule, symbolizing a bespoke block trade](https://options.greeks.live/wp-content/uploads/2025/07/precision-engineered-interface-for-institutional-digital-asset-derivatives-request-for-quote-protocol-high-fidelity-execution-within-principal-operating-system.jpg)

## Agency Broker Strategic Framework

An agency broker’s strategy is one of pure service provision. It has no principal risk, so its entire focus is on designing a system that delivers the best outcome for the client as measured against the entire market. The strategy is one of technological superiority in market access and routing intelligence.

How does an agency broker prove its value? The answer lies in its ability to navigate a complex and fragmented market. Its systems are built to dissect client orders and route them intelligently to achieve the optimal result based on a range of execution factors.

### Execution Venue Analysis by Agency Broker

| Venue Type | Primary Advantage | Key Consideration for SOR |
| --- | --- | --- |

> An agency broker’s strategic imperative is to build and maintain a dynamic, multi-venue routing capability that can demonstrably prove its value through superior execution quality metrics.

The core of the agency broker’s strategy is its Smart Order Router (SOR). The SOR is a complex algorithm that takes a client order and determines the best place to execute it based on the client’s instructions and the broker’s best [execution policy](https://prime.greeks.live/area/execution-policy/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite). This involves a continuous analysis of factors like:

- **Liquidity Analysis** ▴ The SOR constantly monitors the depth and quality of liquidity available on all connected venues.

- **Cost Analysis** ▴ It calculates the all-in cost of execution, including exchange fees, clearing costs, and any implicit costs like [market impact](https://prime.greeks.live/area/market-impact/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite).

- **Latency Optimization** ▴ The system is designed to route orders to venues with the fastest and most reliable execution speeds.

- **TCA Integration** ▴ Post-trade, the broker uses [Transaction Cost Analysis](https://prime.greeks.live/area/transaction-cost-analysis/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) (TCA) to measure its performance against benchmarks and refine the SOR’s logic for future orders. This feedback loop is essential for proving and improving best execution.

![Precision system for institutional digital asset derivatives. Translucent elements denote multi-leg spread structures and RFQ protocols](https://options.greeks.live/wp-content/uploads/2025/07/precision-execution-infrastructure-for-institutional-digital-asset-derivatives-request-for-quote-protocol-optimization.jpg)

![A polished, dark teal institutional-grade mechanism reveals an internal beige interface, precisely deploying a metallic, arrow-etched component. This signifies high-fidelity execution within an RFQ protocol, enabling atomic settlement and optimized price discovery for institutional digital asset derivatives and multi-leg spreads, ensuring minimal slippage and robust capital efficiency](https://options.greeks.live/wp-content/uploads/2025/08/quantitative-finance-driven-rfq-workflow-for-best-execution-in-digital-assets.jpg)

## Execution

The execution of best execution obligations manifests in the precise operational protocols and technological architectures of the Systematic Internaliser and the agency broker. For the SI, execution is a function of its internal quoting and risk systems. For the agency broker, it is a continuous process of external market surveillance and dynamic order routing. Both are subject to rigorous monitoring and reporting requirements under MiFID II, but their methods of compliance are fundamentally different.

![Parallel marked channels depict granular market microstructure across diverse institutional liquidity pools. A glowing cyan ring highlights an active Request for Quote RFQ for precise price discovery](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-high-fidelity-execution-3.jpg)

## Systematic Internaliser Execution Protocols

An SI’s execution workflow is self-contained. When it receives a request for quote (RFQ) or an order from a client, its obligation is triggered. The process is governed by its internal systems and its public quoting obligations.

What does this process look like in practice? The SI’s system will first check the order against its current risk positions and inventory. It will then consult its internal pricing engine, which is continuously updated with market data from lit venues. The SI must publish firm quotes for liquid instruments up to a standard market size.

For orders within this size, the SI is obligated to execute at its quoted price. For larger orders, it can offer price improvement.

### SI Order Execution Workflow

| Step | Action | Best Execution Consideration |
| --- | --- | --- |

![A sleek, multi-layered institutional crypto derivatives platform interface, featuring a transparent intelligence layer for real-time market microstructure analysis. Buttons signify RFQ protocol initiation for block trades, enabling high-fidelity execution and optimal price discovery within a robust Prime RFQ](https://options.greeks.live/wp-content/uploads/2025/07/institutional-crypto-derivatives-os-precision-execution-rfq-protocol-intelligence-layer.jpg)

## Agency Broker Execution Protocols

The agency broker’s execution protocol is an exercise in comparative analysis. Its systems are designed to make an informed choice on behalf of the client. The core of this protocol is the firm’s execution policy, which must be agreed upon with the client and detail the factors that will be considered when routing orders.

The process begins when the client’s order hits the broker’s Order Management System (OMS). The Smart Order Router (SOR) then takes over, applying a complex decision-making logic:

- **Order Decomposition** ▴ The SOR may break a large order into smaller child orders to minimize market impact. This is a critical technique for achieving best execution for institutional-sized trades.

- **Venue Analysis** ▴ The SOR’s algorithm assesses all available execution venues against the “best execution factors” outlined in MiFID II. This is a real-time calculation. For example, for a small, liquid order where price is the primary concern, the SOR might route it to the venue displaying the best price. For a large, illiquid order, the likelihood of execution and minimizing market impact might take precedence, leading the SOR to a dark pool or an SI.

- **Dynamic Routing** ▴ The SOR’s logic is not static. It adapts to changing market conditions. If one venue’s latency increases or its fill rates drop, the SOR will dynamically re-route orders to better-performing venues.

- **Transaction Cost Analysis (TCA)** ▴ After execution, the agency broker must provide the client with a detailed report on the quality of execution. This TCA report will compare the execution price against various benchmarks (e.g. arrival price, VWAP) and provide evidence that the broker took all sufficient steps to achieve the best possible result. This data is also used to refine the SOR’s algorithms, creating a continuous improvement cycle.

The operational difference is stark. The SI’s execution is a bilateral event, judged on the quality of its own price. The agency broker’s execution is a multi-lateral process, judged on the quality of its decision-making in navigating the entire market on behalf of its client.

![Central, interlocked mechanical structures symbolize a sophisticated Crypto Derivatives OS driving institutional RFQ protocol. Surrounding blades represent diverse liquidity pools and multi-leg spread components](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-protocol-architecture-optimizing-high-fidelity-execution-across-diverse-liquidity-pools.jpg)

## References

- European Securities and Markets Authority. “Best execution under MiFID.” CESR/07-320b, 2007.

- “Directive 2014/65/EU of the European Parliament and of the Council of 15 May 2014 on markets in financial instruments and amending Directive 2002/92/EC and Directive 2011/61/EU.” Official Journal of the European Union, 2014.

- CFA Institute. “MiFID II and Systematic Internalisers ▴ If Only Someone Knew This Would Happen.” Enterprising Investor, 13 July 2018.

- Autorité des marchés financiers. “Summary document on SPOT inspections of the best execution and best selection obligations applicable to asset management companies.” AMF, 2021.

- BaFin. “Systematic internalisers ▴ Main points of the new supervisory regime under MiFID II.” BaFinPerspectives, 2017.

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## Reflection

Understanding the operational distinctions in best execution obligations moves us beyond a simple regulatory checklist. It prompts a deeper inquiry into the architecture of our own trading frameworks. Is our system designed for internalized price provision or for external market navigation?

The answer defines the very nature of our market interaction. The knowledge of these divergent paths is a critical component in designing a truly superior execution system, one that aligns its architecture with its fundamental purpose and provides a measurable, strategic advantage in the market.

![A sleek, abstract system interface with a central spherical lens representing real-time Price Discovery and Implied Volatility analysis for institutional Digital Asset Derivatives. Its precise contours signify High-Fidelity Execution and robust RFQ protocol orchestration, managing latent liquidity and minimizing slippage for optimized Alpha Generation](https://options.greeks.live/wp-content/uploads/2025/07/high-fidelity-institutional-digital-asset-derivatives-execution-via-optimized-rfq-protocols-enhancing-market-microstructure.jpg)

## Glossary

<a href="https://prime.greeks.live/area/systematic-internaliser/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![A sophisticated digital asset derivatives trading mechanism features a central processing hub with luminous blue accents, symbolizing an intelligence layer driving high fidelity execution. Transparent circular elements represent dynamic liquidity pools and a complex volatility surface, revealing market microstructure and atomic settlement via an advanced RFQ protocol](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-protocols-high-fidelity-execution-framework-optimizing-market-microstructure-price-discovery-intelligence-layer.jpg)

## Systematic Internaliser

Meaning ▴ A Systematic Internaliser (SI) is a financial institution executing client orders against its own capital on an organized, frequent, systematic basis off-exchange. </a><a href="https://prime.greeks.live/area/best-execution/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![A central, intricate blue mechanism, evocative of an Execution Management System EMS or Prime RFQ, embodies algorithmic trading. Transparent rings signify dynamic liquidity pools and price discovery for institutional digital asset derivatives](https://options.greeks.live/wp-content/uploads/2025/07/precision-engineered-institutional-digital-asset-derivatives-framework-driving-high-fidelity-rfq-execution-and-optimized-market-microstructure-for-capital-efficiency.jpg)

## Best Execution

Meaning ▴ Best Execution is the obligation to obtain the most favorable terms reasonably available for a client's order. </a><a href="https://prime.greeks.live/area/agency-broker/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![A sophisticated metallic mechanism, split into distinct operational segments, represents the core of a Prime RFQ for institutional digital asset derivatives. Its central gears symbolize high-fidelity execution within RFQ protocols, facilitating price discovery and atomic settlement](https://options.greeks.live/wp-content/uploads/2025/07/precision-rfq-engine-for-institutional-digital-asset-derivatives-trading.jpg)

## Agency Broker

Meaning ▴ An Agency Broker functions as an execution intermediary, operating solely on behalf of a Principal to facilitate the purchase or sale of digital asset derivatives without committing its own capital or taking a proprietary position. </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">
![A sophisticated dark-hued institutional-grade digital asset derivatives platform interface, featuring a glowing aperture symbolizing active RFQ price discovery and high-fidelity execution. The integrated intelligence layer facilitates atomic settlement and multi-leg spread processing, optimizing market microstructure for prime brokerage operations and capital efficiency](https://options.greeks.live/wp-content/uploads/2025/07/institutional-crypto-derivatives-rfq-engine-intelligence-layer.jpg)

## 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/best-execution-duty/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![A sphere split into light and dark segments, revealing a luminous core. This encapsulates the precise Request for Quote RFQ protocol for institutional digital asset derivatives, highlighting high-fidelity execution, optimal price discovery, and advanced market microstructure within aggregated liquidity pools](https://options.greeks.live/wp-content/uploads/2025/07/high-fidelity-execution-framework-for-institutional-digital-asset-derivatives-request-for-quote-protocol-optimization.jpg)

## Best Execution Duty

Meaning ▴ Best Execution Duty mandates that an executing party take all reasonable steps to obtain the most favorable terms available for a client's order, considering a comprehensive set of factors beyond mere price. </a><a href="https://prime.greeks.live/area/price-improvement/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![A sleek, cream and dark blue institutional trading terminal with a dark interactive display. It embodies a proprietary Prime RFQ, facilitating secure RFQ protocols for digital asset derivatives](https://options.greeks.live/wp-content/uploads/2025/08/institutional-digital-asset-derivatives-rfq-terminal-for-best-execution.jpg)

## Price Improvement

Meaning ▴ Price improvement denotes the execution of a trade at a more advantageous price than the prevailing National Best Bid and Offer (NBBO) at the moment of order submission. </a><a href="https://prime.greeks.live/area/execution-policy/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![A symmetrical, star-shaped Prime RFQ engine with four translucent blades symbolizes multi-leg spread execution and diverse liquidity pools. Its central core represents price discovery for aggregated inquiry, ensuring high-fidelity execution within a secure market microstructure via smart order routing for block trades](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-execution-engine-prime-os-1.jpg)

## Execution Policy

Meaning ▴ An Execution Policy defines a structured set of rules and computational logic governing the handling and execution of financial orders within a trading system. </a><a href="https://prime.greeks.live/area/market-impact/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![An abstract system depicts an institutional-grade digital asset derivatives platform. Interwoven metallic conduits symbolize low-latency RFQ execution pathways, facilitating efficient block trade routing](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-prime-os-rfq-execution-engine.jpg)

## Market Impact

Meaning ▴ Market Impact refers to the observed change in an asset's price resulting from the execution of a trading order, primarily influenced by the order's size relative to available liquidity and prevailing market conditions. </a><a href="https://prime.greeks.live/area/transaction-cost-analysis/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![A futuristic, metallic sphere, the Prime RFQ engine, anchors two intersecting blade-like structures. These symbolize multi-leg spread strategies and precise algorithmic execution for institutional digital asset derivatives](https://options.greeks.live/wp-content/uploads/2025/07/prime-os-for-high-fidelity-rfq-execution-in-digital-asset-derivatives.jpg)

## Transaction Cost Analysis

Meaning ▴ Transaction Cost Analysis (TCA) is the quantitative methodology for assessing the explicit and implicit costs incurred during the execution of financial trades. </a>

**Tags:** [Execution Policy](https://options.greeks.live/area/execution-policy/), [RTS 28](https://options.greeks.live/area/rts-28/), [Fiduciary Duty](https://options.greeks.live/area/fiduciary-duty/), [Price Improvement](https://options.greeks.live/area/price-improvement/), [Market Impact](https://options.greeks.live/area/market-impact/), [Best Execution Duty](https://options.greeks.live/area/best-execution-duty/)	

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SI price improvement provides quantifiable evidence of best execution by delivering a superior price, which is a core component of the multi-faceted regulatory mandate.

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MiFID II redefines best execution by mandating a shift from qualitative policy to quantitative, data-driven proof of optimal outcomes.

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MiFID II requires SORs to systematically process multiple execution factors to demonstrably achieve the best possible client result.

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The core distinction in an RFQ is whether an institution transfers risk via a principal trade or manages it through an agency-led auction.

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![A central toroidal structure and intricate core are bisected by two blades: one algorithmic with circuits, the other solid. This symbolizes an institutional digital asset derivatives platform, leveraging RFQ protocols for high-fidelity execution and price discovery. It optimizes market microstructure for capital efficiency, managing multi-leg spreads and latent liquidity within a Principal's operational framework.](https://options.greeks.live/wp-content/uploads/2025/07/digital-asset-derivatives-rfq-execution-hub-integrating-algorithmic-intelligence-for-high-fidelity-price-discovery-and-liquidity-aggregation.jpg)

The rise of Systematic Internalisers fragments liquidity and data, demanding a dynamic, quantitative approach to venue selection and best execution.

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MiFID II transformed fixed income RFQ best execution from a qualitative duty into a quantitatively provable, data-driven process.

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MiFID II mandates a data-driven system where counterparty viability and execution factors forge optimal client outcomes.

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MiFID II transforms venue selection from a price-based choice into a dynamic, data-driven process optimizing for the best outcome.

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### [How Does the Systematic Internaliser Regime Impact Best Execution Obligations for the Buy-Side?](https://options.greeks.live/question/how-does-the-systematic-internaliser-regime-impact-best-execution-obligations-for-the-buy-side/)
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The SI regime codifies principal liquidity, compelling buy-side firms to integrate this quasi-public venue into their execution framework to prove best execution.

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---

**Original URL:** https://options.greeks.live/question/how-does-the-si-best-execution-obligation-differ-from-that-of-an-agency-broker/
