Fastest Execution Brokers In The UK 2025

Author

Christian Harris

Christian is a UK-based investment writer who's been actively trading an array of financial instruments for over 10 years. Having used most of the major brokers in the UK, Christian provides valuable insights on all things investing for British traders.

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Editor

James Barra

James is a UK-based writer and investor with consultancy experience at some of Britain's largest financial organisations. James authors, edits and fact-checks content for a row of investing websites.

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Fact Checker

Tobias Robinson

Tobias is a UK director and partner at Investing.co.uk. He provides commentary on the financial markets in the UK and supports the testing team with first-hand observations from over two decades of active trading.

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Looking to gain an edge in the markets? Whether you’re a day trader chasing momentum or an investor seeking minimal slippage, execution speed can make or break your returns.

We reveal the fastest execution brokers in the UK – so your trades hit the market when you want, not after it’s too late.

How We Picked The Top Brokers For Execution Speed

All brokers were tested in the UK and assessed using our own Execution benchmark, which looks at speed, reliability, and order accuracy.

We measured key performance factors including execution time, slippage, and requotes, where possible.

We also considered:

• Broker-published stats, where available, to check transparency
• Ongoing market research to keep insights current and relevant

Brokers were then individually rated for their execution speed and quality, and ranked, with the top UK platforms delivering fast, stable, and accurate trade execution.

Why Does My Broker’s Execution Speed Matter?

In trading, milliseconds can make a measurable difference. Execution speed refers to the speed at which a broker can process and fill an order at the market price.

For UK investors trading fast-moving assets—such as FTSE 100 stocks, UK-listed ETFs, or forex pairs involving the GBP—this matters more than you might think.

When prices are volatile, even a slight delay between clicking ‘Buy’ or ‘Sell’ and your order being executed can result in slippage—where you get a worse price than expected. Over time, slippage erodes returns, particularly for short-term or high-frequency strategies.

For example, imagine I place a buy order for 1,000 shares of BAE Systems priced at £1,500 each. If my order is executed at £1,500.10 instead of £1,500, the 10p difference per share means I end up paying an extra £100 due to slippage (£0.10 x 1,000 shares). Ouch.

How Is Broker Execution Speed Measured?

Broker execution speed is measured in milliseconds (ms)—the time it takes from when you place a trade to when it’s filled.

In our view, a good execution speed is anything under 100ms. If it’s over 200ms, you’re more likely to experience slippage, where your order is filled at a worse price than expected.

The best brokers usually publish their average execution times to showcase their speed. For example, Pepperstone completes most trades in under 0.03 seconds (30ms), while IG reports that 97.93% of orders are filled in 0.027 seconds (27ms) or less.

TopFX’s deep and consistent liquidity helps it deliver fast execution speeds

What Factors Affect Broker Execution Speed?

• Business model: UK brokers primarily operate as either Dealing Desk (Market Makers) or Non-Dealing Desk (NDD) providers. Market Makers can offer fast execution by internalising trades but may delay orders if liquidity in UK-listed stocks, such as FTSE 100 shares, is insufficient. NDD brokers, including ECN and STP types, route orders directly to liquidity pools, such as those of LSE members or major banks, enabling quicker fills and tighter spreads due to direct market access.
• Liquidity: Liquidity reflects how easily UK assets, such as FTSE shares or GBP currency pairs, can be traded without affecting their price. High liquidity during London’s trading hours means that orders for popular assets, such as GBP/USD or Lloyds Banking Group shares, are matched quickly with minimal slippage. In contrast, thinly traded or less popular UK stocks may experience slower fills and price fluctuations due to limited counterparty activity.
• Price: Execution speed depends on the depth of the order book around your chosen price. UK brokers provide Level 2 market data showing real-time bids and asks beyond the best prices, allowing you to position orders strategically within the LSE order flow, thereby improving chances of immediate execution near your desired price.
• Order type: Market orders prioritise speed and are executed at the best available UK market price, which is essential during fast-moving sessions such as the London open. Limit orders set specific price thresholds and may remain unfilled if the asset’s price doesn’t reach your limit, potentially causing delays, especially for less liquid UK assets.
• Order size: Larger orders in UK stocks or GBP forex pairs can take longer to fill, particularly if there isn’t enough volume at your target price. For example, placing a large buy order on a smaller AIM-listed stock may result in partial fills. Checking Level 2 order book data can help you adjust order sizes to match the available liquidity, resulting in faster execution.
• Time of day: UK market activity peaks during core hours (08:00 – 16:30 GMT), particularly in the first hour after the LSE opens, resulting in faster order execution. Forex pairs involving GBP experience heightened liquidity when the UK and US markets overlap (around 13:00 – 16:00 GMT), which improves trade speed for GBP/USD and similar pairs.
• Market volatility: During high-volatility periods—such as UK economic announcements or geopolitical events—price swings in assets like FTSE 100 futures or GBP currency pairs can widen spreads and slow order fills, increasing slippage risk as brokers struggle to match orders at desired prices quickly.
• Internet speed: Low-latency connections to brokers with servers physically located near London exchanges are crucial for minimising execution delays. A broadband speed of at least 25 Mbps is recommended, with higher speeds (up to 100 Mbps) being beneficial for active traders or scalpers who execute frequent trades on platforms like Interactive Brokers or CMC Markets.
• Your device: Trade execution depends partly on the performance of your computer or mobile device. Platforms like MetaTrader 5 benefit from 64-bit processing and faster data handling compared to MetaTrader 4. Keeping your system updated and optimised ensures your orders are sent promptly and reduces lag during crucial London market hours.

From my experience trading UK markets, the fastest execution brokers aren’t just those with the best tech—they’re the ones that blend cutting-edge infrastructure with deep local market connectivity.

This combination consistently delivers the speed and precision needed to stay ahead in London’s highly competitive trading environment.

Christian Harris

Author

Bottom Line

Fast execution speeds are crucial for capitalising on market opportunities and reducing costly slippage.

Selecting brokers with advanced technology, direct market access, and robust liquidity will help ensure that your trades are executed swiftly and accurately.

Understanding factors like broker type, market hours, and order size will also help you optimise your trading experience for the fastest fills.

To get started, see our rankings of the fastest execution brokers in the UK.