Transaction Cost Analysis (TCA)

Standard post-trade TCA relies on top-of-book or delayed consolidated tape data, failing to capture true market states, fill dynamics, or liquidity conditions at the exact nanosecond of execution. Building and maintaining the full order book infrastructure required to achieve meaningful, high-fidelity execution analysis is complex and resource-intensive.

BMLL removes this operational barrier by delivering harmonised, and normalised nanosecond-precision historical order book data and pre-computed analytics. This allows execution desks, quantitative researchers, and compliance teams to reconstruct the exact state of the market around every trade, enabling deep analysis of slippage, market impact, and adverse selection without managing complex data pipelines.

KEY CAPABILITIES Measure True Execution Performance and Prove Best Execution

BMLL provides the transparency needed to move beyond simple benchmark comparisons, enabling market participants to evaluate execution quality against the real-time market depth.

Full Order Book Reconstruction

Rebuild the complete market depth message by message at the exact nanosecond of your execution to isolate true market impact from passive drift.

Queue Position & Fill Analysis

Evaluate queue dynamics, cancellation rates, and order book imbalances at the time of order entry to detect adverse selection and optimise routing logic.

Independent Broker Governance

Empower buy-side firms to benchmark broker algorithms and execution venues objectively using unconflicted, cross-venue harmonised datasets.

Pre- to Post-Trade Alignment

Use historical liquidity profiles, spread dynamics, and venue behaviour to calibrate pre-trade cost estimation models and improve parent-order scheduling.

Venue & Liquidity Pool Evaluation

Analyse execution performance across lit venues, dark pools, and periodic auctions to identify where child orders experience optimal fills.

Essential Data & Metrics

Order book data harmonised across global equity, ETF, futures and option venues for granular forensic analysis.

Pre-computed execution quality metrics, including Time at Best, effective/realised spreads, and order book imbalance dynamics.

Nanosecond-precision timestamps for exact trade-to-quote sequencing and latency-leakage modelling.

Harmonised condition codes, auction phases, and venue-specific order types to accurately categorise every execution environment.

BENEFITS & USE CASES How BMLL Supports Transaction Cost Analysis (TCA)

Platform	Benefit	Use Cases
	A secure cloud-based research environment that enables deep, scalable analysis of harmonised historical market data and pre-computed analytics without infrastructure overhead.	• Prototyping bespoke TCA and market impact models • Custom broker performance and algorithm benchmarking algorithms • Deep-dive micro-structural slip and fill research
	Delivers normalised datasets and pre-computed analytics directly into your environment for seamless integration into existing workflows.	• Powering automated enterprise post-trade TCA pipelines • Systematic compliance and best-execution reporting ingestion • Feeding internal execution databases for continuous algo calibration

BMLL ECOSYSTEM Explore the BMLL Platform

Access to our full range historical harmonised and normalised level 3, equities, futures, options and prediction markets market data, built in analytics and compute that scales across CPU and GPU. Built for alpha, insights, research, development and data science. Designed by quants.

Petabytes of historical market data and derived analytics, securely delivered to your environment by API, files, cloud warehouse or data platform. Level 3 order book granularity, normalised across venues and geographies, research-ready schema.

Intuitive no code visual application bringing all market participants exceptional granular insights over 500 metrics derived from BMLL best in class Level 3.

LATEST INSIGHTS Case Studies and Client Insights

26 November 2025

A-Team Insight - From Broker Bias to Independent Insight: The Case for Cloud-Native TCA

For years, the path of least resistance for buy-side transaction cost analysis (TCA) was simple: let the broker do it. To escape this fragmentation and gain an independent view, firms have traditionally faced a new dilemma, a binary choice between building a solution from scratch or buying a rigid third-party tool.

Read the Article

21 November 2025

Competing in today’s dynamic markets with faster, smarter execution analytic

How a leading $1.5 Trillion AUM asset management firm leveraged BMLL data to optimize TCA workflows

Read the Case study

3 September 2024

Normalisation: a dirty word or a differentiator for success?

Trading practitioners and quants need access to high quality data that captures all information, but importantly is also consistent and easy to use. Dr Elliot Banks takes a deeper look at what good data normalisation really means, and why it matters.