# What Are the Key Differences in Documenting Best Execution for Illiquid versus Liquid Assets? ▴ Question

**Published:** 2025-08-09
**Categories:** Question

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## Concept

The mandate to achieve and document best execution is a cornerstone of fiduciary responsibility in financial markets. For liquid assets, characterized by high trading volumes and readily available pricing data, the process of documenting best execution is a relatively quantitative and structured exercise. The challenge intensifies significantly when dealing with [illiquid assets](https://prime.greeks.live/area/illiquid-assets/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite), where the absence of continuous pricing and transparent market data transforms the [documentation process](https://prime.greeks.live/question/how-does-the-rationale-documentation-process-integrate-with-post-trade-tca/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) into a more nuanced, qualitative, and ultimately more complex undertaking. The divergence in documentation practices is not a matter of choice but a direct consequence of the inherent structural differences between these two asset classes.

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## The Liquid Asset Paradigm

In the realm of liquid assets, such as actively traded equities and high-volume fixed-income securities, the concept of best execution is anchored in a wealth of readily available data. The documentation process in this context is heavily reliant on quantitative metrics, with price being a primary, though not exclusive, consideration. The availability of continuous, real-time data from multiple trading venues provides a clear and defensible benchmark against which to measure [execution quality](https://prime.greeks.live/area/execution-quality/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite). This data-rich environment facilitates a more straightforward and systematic approach to documenting compliance with [best execution obligations](https://prime.greeks.live/area/best-execution-obligations/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite).

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## Key Documentation Elements for Liquid Assets

- **[Price Improvement](https://prime.greeks.live/area/price-improvement/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite)** ▴ A critical metric, documenting the extent to which a trade was executed at a price more favorable than the prevailing national best bid and offer (NBBO).

- **[Effective Spread](https://prime.greeks.live/area/effective-spread/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite)** ▴ This measures the difference between the execution price and the midpoint of the bid-ask spread at the time of the trade, providing insight into the true cost of execution.

- **Speed of Execution** ▴ In fast-moving markets, the time taken to execute an order can be a critical factor in achieving the best outcome. Documentation should capture the time of order receipt, routing, and execution.

- **[Fill Rate](https://prime.greeks.live/area/fill-rate/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite)** ▴ The percentage of an order that is successfully executed is a key consideration, particularly for large orders that may need to be worked over time.

![A multi-faceted crystalline star, symbolizing the intricate Prime RFQ architecture, rests on a reflective dark surface. Its sharp angles represent precise algorithmic trading for institutional digital asset derivatives, enabling high-fidelity execution and price discovery](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-protocols-high-fidelity-execution-market-microstructure-optimization-for-prime-os-alpha-generation.jpg)

## The Illiquid Asset Conundrum

For illiquid assets, which include certain types of bonds, private equity, and other alternative investments, the documentation of [best execution](https://prime.greeks.live/area/best-execution/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) is a far more intricate process. The defining characteristic of these markets is the scarcity of reliable, real-time pricing data. This absence of a clear and continuous price discovery mechanism means that a purely quantitative approach to documenting best execution is often impractical and, in many cases, impossible. Consequently, the focus of documentation shifts from a narrow emphasis on price to a broader, more qualitative assessment of the overall [execution process](https://prime.greeks.live/question/what-are-the-primary-legal-differences-between-a-tender-process-and-an-rfp-process-in-public-sector-procurement/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite).

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## The Qualitative Shift in Documentation

In the absence of robust quantitative benchmarks, the documentation for illiquid asset trades must provide a detailed narrative of the steps taken to achieve the best possible outcome for the client. This narrative becomes the primary evidence of compliance with best execution obligations. The emphasis is on demonstrating a thorough, diligent, and well-reasoned approach to the trade, taking into account the unique characteristics of the asset and the prevailing market conditions.

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## Strategy

The strategic approach to documenting best execution for liquid versus illiquid assets is fundamentally different, reflecting the contrasting nature of these markets. For [liquid assets](https://prime.greeks.live/area/liquid-assets/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite), the strategy is one of systematic, data-driven comparison and analysis. For illiquid assets, the strategy is one of meticulous process documentation and qualitative justification.

The overarching goal remains the same ▴ to demonstrate that the client’s best interests were paramount in the execution of the trade. However, the methods employed to achieve this goal diverge significantly.

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## A Tale of Two Strategies

The table below provides a comparative overview of the strategic approaches to documenting best execution for liquid and illiquid assets:

### Table 1 ▴ Strategic Comparison of Best Execution Documentation

| Factor | Liquid Assets | Illiquid Assets |
| --- | --- | --- |
| Primary Focus | Quantitative analysis of execution quality against market benchmarks. | Qualitative documentation of the execution process and decision-making. |
| Data Sources | Real-time market data feeds, transaction cost analysis (TCA) reports, and post-trade analytics. | Broker quotes, dealer indications of interest, and internal valuation models. |
| Key Metrics | Price improvement, effective spread, speed of execution, and fill rate. | Number of dealers contacted, rationale for dealer selection, and justification for the final execution price. |
| Documentation Style | Standardized, data-intensive reports and exception-based analysis. | Narrative, descriptive, and often customized to the specific circumstances of the trade. |

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## The Role of Technology

Technology plays a important role in the documentation of best execution for both liquid and illiquid assets, but its application differs significantly. For liquid assets, sophisticated trading algorithms and [transaction cost analysis](https://prime.greeks.live/area/transaction-cost-analysis/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) ([TCA](https://prime.greeks.live/area/tca/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite)) platforms are used to automate the execution process and generate detailed, quantitative reports on execution quality. These tools provide a robust and auditable trail of the steps taken to achieve best execution. For illiquid assets, technology is more likely to be used as a communication and record-keeping tool, facilitating the documentation of the qualitative factors that drive the execution decision.

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## Technology in Action

- **Liquid Assets** ▴ Automated trading systems can be programmed to seek out the best available price across multiple venues, while TCA platforms can provide detailed post-trade analysis of execution costs.

- **Illiquid Assets** ▴ Electronic platforms can be used to solicit quotes from multiple dealers, creating a clear and contemporaneous record of the price discovery process.

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## Execution

The execution of a compliant [best execution documentation](https://prime.greeks.live/area/best-execution-documentation/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) process requires a well-defined framework and a commitment to thorough and accurate record-keeping. The specific steps involved will vary depending on the asset class, but the underlying principles of diligence, transparency, and accountability remain constant. A robust documentation process not only ensures compliance with regulatory requirements but also provides a valuable tool for internal review and continuous improvement.

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## A Practical Guide to Documentation

The following table outlines the key steps in the documentation process for both liquid and illiquid assets:

### Table 2 ▴ Best Execution Documentation Checklist

| Step | Liquid Assets | Illiquid Assets |
| --- | --- | --- |
| Pre-Trade | Define the execution strategy, including the choice of algorithm and trading venue. Document any specific client instructions. | Identify potential dealers, solicit indications of interest, and document the rationale for the chosen execution strategy. |
| At-Trade | Capture real-time market data, including the NBBO and the depth of the order book. Record the time of order routing and execution. | Document all communications with dealers, including quotes received and the final terms of the trade. |
| Post-Trade | Generate a detailed transaction cost analysis (TCA) report, comparing the execution quality against relevant benchmarks. | Prepare a narrative summary of the trade, explaining the rationale for the final execution price and the choice of counterparty. |

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## The Human Element

While technology can automate many aspects of the documentation process, the human element remains a critical component of a compliant best execution framework. This is particularly true for illiquid assets, where the judgment and experience of the trader are often the most important factors in achieving the best possible outcome for the client. A well-documented trade should not only include the relevant data and metrics but also provide a clear and compelling narrative of the thought process behind the execution decision.

> The documentation of best execution is a journey, not a destination.

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## The Importance of Training and Oversight

To ensure the consistent and effective implementation of a best [execution documentation](https://prime.greeks.live/question/how-does-the-choice-of-execution-venue-impact-best-execution-documentation/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) process, it is essential to provide comprehensive training to all relevant personnel. This training should cover not only the technical aspects of the documentation process but also the underlying principles of best execution and the firm’s specific policies and procedures. Regular internal reviews and audits can help to identify any weaknesses in the documentation process and ensure that the firm is meeting its regulatory obligations.

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## References

- The Investment Association. “FIXED INCOME BEST EXECUTION ▴ NOT JUST A NUMBER.” The Investment Association, 2018.

- Nguyen, Bao. “Fund Managers ▴ Document Best Execution Practices and Choices.” Kaufman Rossin, 16 Jan. 2020.

- IMTC. “Best Practices for Best Execution.” IMTC, 18 Sept. 2018.

- FINRA. “Best Execution.” FINRA.org.

- Deloitte. “Good, Better, ‘Best’ Does your Execution stand up to MiFID II?” Deloitte, 2017.

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## Reflection

The documentation of best execution is a dynamic and evolving discipline. As markets become more complex and interconnected, the challenge of demonstrating compliance with best execution obligations will only intensify. A robust and well-documented best execution process is not simply a matter of [regulatory compliance](https://prime.greeks.live/area/regulatory-compliance/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite); it is a fundamental component of a firm’s commitment to its clients. By embracing a culture of transparency, diligence, and continuous improvement, firms can not only meet their regulatory obligations but also enhance their reputation and build stronger, more enduring relationships with their clients.

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## The Future of Best Execution

The increasing availability of data and the development of more sophisticated analytical tools are likely to have a profound impact on the future of best execution documentation. For liquid assets, the trend towards greater automation and real-time analysis is likely to continue, providing ever more granular insights into execution quality. For illiquid assets, the challenge will be to harness the power of technology to bring greater transparency to these opaque markets, without losing sight of the qualitative factors that are so important in achieving the best possible outcome for the client.

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## Glossary

<a href="https://prime.greeks.live/question/how-does-the-rationale-documentation-process-integrate-with-post-trade-tca/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Documentation Process

Integrating rationale documentation with post-trade TCA creates a closed-loop system for optimizing execution by auditing strategy against data. </a><a href="https://prime.greeks.live/area/illiquid-assets/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Illiquid Assets

Meaning ▴ An illiquid asset is an investment that cannot be readily converted into cash without a substantial loss in value or a significant delay. </a><a href="https://prime.greeks.live/area/best-execution-obligations/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Best Execution Obligations

Meaning ▴ Best Execution Obligations define the regulatory and fiduciary imperative for financial intermediaries to achieve the most favorable terms reasonably available for client orders. </a><a href="https://prime.greeks.live/area/execution-quality/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Execution Quality

Meaning ▴ Execution Quality quantifies the efficacy of an order's fill, assessing how closely the achieved trade price aligns with the prevailing market price at submission, alongside consideration for speed, cost, and market impact. </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">
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## 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/effective-spread/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Effective Spread

Meaning ▴ Effective Spread quantifies the actual transaction cost incurred during an order execution, measured as twice the absolute difference between the execution price and the prevailing midpoint of the bid-ask spread at the moment the order was submitted. </a><a href="https://prime.greeks.live/area/fill-rate/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Fill Rate

Meaning ▴ Fill Rate represents the ratio of the executed quantity of a trading order to its initial submitted quantity, expressed as a percentage. </a><a href="https://prime.greeks.live/question/what-are-the-primary-legal-differences-between-a-tender-process-and-an-rfp-process-in-public-sector-procurement/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![Precision-engineered abstract components depict institutional digital asset derivatives trading. A central sphere, symbolizing core asset price discovery, supports intersecting elements representing multi-leg spreads and aggregated inquiry](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-execution-microstructure-optimization.jpg)

## Execution Process

A tender creates a binding process contract upon bid submission; an RFP initiates a flexible, non-binding negotiation. </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">
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## 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/liquid-assets/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Liquid Assets

Meaning ▴ Liquid assets represent any financial instrument or property readily convertible into cash at or near its current market value with minimal impact on price, signifying immediate access to capital for operational or strategic deployment within a robust financial architecture. </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">
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## 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><a href="https://prime.greeks.live/area/tca/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Tca

Meaning ▴ Transaction Cost Analysis (TCA) represents a quantitative methodology designed to evaluate the explicit and implicit costs incurred during the execution of financial trades. </a><a href="https://prime.greeks.live/area/best-execution-documentation/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Best Execution Documentation

Meaning ▴ Best Execution Documentation constitutes the verifiable record of an institution's adherence to its best execution policy, encompassing pre-trade analysis, real-time decision-making, and post-trade validation. </a><a href="https://prime.greeks.live/question/how-does-the-choice-of-execution-venue-impact-best-execution-documentation/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Execution Documentation

Venue selection dictates the available evidence, transforming best execution documentation from a compliance task into a quantifiable record of strategic intent. </a><a href="https://prime.greeks.live/area/regulatory-compliance/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Regulatory Compliance

Meaning ▴ Adherence to legal statutes, regulatory mandates, and internal policies governing financial operations, especially in institutional digital asset derivatives. </a>

**Tags:** [Fill Rate](https://options.greeks.live/area/fill-rate/), [TCA](https://options.greeks.live/area/tca/), [Illiquid Assets](https://options.greeks.live/area/illiquid-assets/), [Trade Documentation](https://options.greeks.live/area/trade-documentation/), [Cost Analysis](https://options.greeks.live/area/cost-analysis/), [FINRA](https://options.greeks.live/area/finra/)	

## Discover More

- 
### [How Does the Best Execution Committee Handle Conflicts of Interest like PFOF?](https://options.greeks.live/question/how-does-the-best-execution-committee-handle-conflicts-of-interest-like-pfof/)
![Geometric planes and transparent spheres represent complex market microstructure. A central luminous core signifies efficient price discovery and atomic settlement via RFQ protocol. This visualizes multi-leg spread execution across diverse liquidity pools for institutional digital asset derivatives on a Prime RFQ.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-execution-microstructure-4.jpg)

A Best Execution Committee systematically manages PFOF conflicts by using data-driven reviews to ensure routing decisions prioritize client outcomes over broker incentives.

- 
### [What Are the Primary Challenges in Documenting Best Execution for RFQs in the US?](https://options.greeks.live/question/what-are-the-primary-challenges-in-documenting-best-execution-for-rfqs-in-the-us/)
![A precise digital asset derivatives trading mechanism, featuring transparent data conduits symbolizing RFQ protocol execution and multi-leg spread strategies. Intricate gears visualize market microstructure, ensuring high-fidelity execution and robust price discovery. This system mitigates counterparty risk and optimizes capital efficiency for institutional trading.](https://options.greeks.live/wp-content/uploads/2025/07/high-fidelity-institutional-digital-asset-derivatives-rfq-execution-framework.jpg)

Documenting RFQ best execution requires a systemic fusion of data architecture and quantitative analysis to prove diligence.

- 
### [What Are the Key Differences in Documenting Best Execution for Discretionary versus Non-Discretionary Trades?](https://options.greeks.live/question/what-are-the-key-differences-in-documenting-best-execution-for-discretionary-versus-non-discretionary-trades/)
![A sophisticated RFQ engine module, its spherical lens observing market microstructure and reflecting implied volatility. This Prime RFQ component ensures high-fidelity execution for institutional digital asset derivatives, enabling private quotation for block trades.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-engine-for-best-execution-protocol.jpg)

Documenting discretionary best execution is a defense of judgment; for non-discretionary trades, it's a validation of action.

- 
### [How Do Regulatory Frameworks like Mifid Ii Impact Rfq Strategies and Information Disclosure Requirements?](https://options.greeks.live/question/how-do-regulatory-frameworks-like-mifid-ii-impact-rfq-strategies-and-information-disclosure-requirements/)
![Precision metallic bars intersect above a dark circuit board, symbolizing RFQ protocols driving high-fidelity execution within market microstructure. This represents atomic settlement for institutional digital asset derivatives, enabling price discovery and capital efficiency. The Prime RFQ underpins algorithmic trading, minimizing latency.](https://options.greeks.live/wp-content/uploads/2025/08/institutional-digital-asset-derivatives-rfq-protocol-execution-precision-systemic-framework.jpg)

MiFID II transforms RFQ protocols from discreet interactions into auditable components of a mandatory, data-driven best execution framework.

- 
### [How Have Regulatory Changes like MiFID II Influenced the Evolution of RFQ Strategies?](https://options.greeks.live/question/how-have-regulatory-changes-like-mifid-ii-influenced-the-evolution-of-rfq-strategies/)
![A central translucent disk, representing a Liquidity Pool or RFQ Hub, is intersected by a precision Execution Engine bar. Its core, an Intelligence Layer, signifies dynamic Price Discovery and Algorithmic Trading logic for Digital Asset Derivatives. Surrounding elements denote Market Microstructure and High-Fidelity Execution pathways for Block Trades, ensuring Best Execution within a Prime RFQ framework.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-protocol-engine-visualizing-microstructure.jpg)

MiFID II transformed RFQ from a relationship-based protocol into a data-driven, auditable system to prove best execution.

- 
### [How Does the Concept of “Total Consideration” for Retail Clients Alter Best Execution Analysis?](https://options.greeks.live/question/how-does-the-concept-of-total-consideration-for-retail-clients-alter-best-execution-analysis/)
![A precision-engineered metallic institutional trading platform, bisected by an execution pathway, features a central blue RFQ protocol engine. This Crypto Derivatives OS core facilitates high-fidelity execution, optimal price discovery, and multi-leg spread trading, reflecting advanced market microstructure.](https://options.greeks.live/wp-content/uploads/2025/08/precision-engineered-institutional-digital-asset-derivatives-execution-core-facilitating-rfq-protocol-driven-optimal-price-discovery-and-multi-leg-spread-trading-for-capital-efficiency.jpg)

Total consideration transforms best execution from a price-centric task into a multi-variable optimization of all explicit and implicit costs.

- 
### [What Specific Data Points Must Be Captured to Prove Best Execution for an Rfq under Rts 28?](https://options.greeks.live/question/what-specific-data-points-must-be-captured-to-prove-best-execution-for-an-rfq-under-rts-28/)
![Intersecting sleek conduits, one with precise water droplets, a reflective sphere, and a dark blade. This symbolizes institutional RFQ protocol for high-fidelity execution, navigating market microstructure. It represents optimal price discovery, block trade facilitation, and atomic settlement for digital asset derivatives, ensuring capital efficiency.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-execution-framework-optimizing-latent-liquidity-discovery-and-atomic-settlement-protocols.jpg)

To prove best execution for an RFQ, one must capture a complete, timestamped narrative of all quotes to demonstrate the chosen price was optimal.

- 
### [How Does a Best Execution Committee Quantify and Compare Different Routing Venues?](https://options.greeks.live/question/how-does-a-best-execution-committee-quantify-and-compare-different-routing-venues/)
![A precise metallic central hub with sharp, grey angular blades signifies high-fidelity execution and smart order routing. Intersecting transparent teal planes represent layered liquidity pools and multi-leg spread structures, illustrating complex market microstructure for efficient price discovery within institutional digital asset derivatives RFQ protocols.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-engine-for-high-fidelity-execution-across-market-microstructure-dynamics.jpg)

A Best Execution Committee engineers a data-driven system to navigate market fragmentation and optimize trading outcomes across cost, speed, and certainty.

- 
### [What Are the Practical Steps for Conducting a Thorough Best Execution Review?](https://options.greeks.live/question/what-are-the-practical-steps-for-conducting-a-thorough-best-execution-review/)
![A sophisticated digital asset derivatives RFQ engine's core components are depicted, showcasing precise market microstructure for optimal price discovery. Its central hub facilitates algorithmic trading, ensuring high-fidelity execution across multi-leg spreads. This system supports institutional prime brokerage operations, minimizing counterparty risk.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-engine-optimizing-multi-leg-spreads-for-optimal-capital-efficiency.jpg)

A best execution review is a systematic process of data-driven analysis and governance to ensure trading strategies achieve optimal outcomes.

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---

**Original URL:** https://options.greeks.live/question/what-are-the-key-differences-in-documenting-best-execution-for-illiquid-versus-liquid-assets/
