London Trading Volumes Three Times Higher Than Thought Due to Dark Trading

London trading volumes are up to three times higher in value than previously understood once off-exchange “dark trading” is factored into official calculations, according to recent Financial Conduct Authority (FCA) data. The revelation aims to ease concerns over the London Stock Exchange’s capital market liquidity and stem corporate migration to New York.

The Bottom Line

• Hidden Liquidity: FCA analysis reveals that non-official channels and private deals routed through banks amplify real trading values up to threefold compared to primary exchange data.
• Countering the Exodus: The enhanced metrics arrive as regulators attempt to convince firms like Wise, Arm, and CRH that London retains deep, viable capital pools.
• Regulatory Overhaul: The FCA plans to launch a “consolidated tape” transparency framework by 2028, though exchange operators warn that data-sharing exemptions could distort market advantages.

Unmasking the City’s Hidden Order Flow

For years, public exchange data has painted a fragile picture of London’s primary markets. Executives at the London Stock Exchange Group conceded in May that the proportion of equity trading executing directly on exchange order books sat at the lowest watermark among major global exchanges.

Here is the math: public exchange tickers capture only a fraction of total institutional activity. Private deals negotiated directly between institutions via banks and alternative financial forums—while anchored to prices established on the London Stock Exchange—routinely bypass the main order books. By accounting for this dark trading, the FCA suggests that cash flowing around the market is vastly underreported by standard exchange feeds.

High-profile companies have repeatedly opted to list or dual-list in New York to capture deeper valuations and broader institutional sponsorship. Yet, the FCA’s revised assessment indicates that the actual liquidity supporting these assets is considerably more robust than headline figures suggest.

Takeover Premiums and the M&A Surge

Data cited by the Financial Times indicates that London-listed equities received public takeover bids at a premium of 20% or more between March and June at a frequency surpassing any other major corporate market.

Target Company	Acquiring Entity / Bidder	Bid Dynamic
Segro	Overseas Institutional Buyers	Public premium bid (“bear hug”)
Beazley	Overseas Institutional Buyers	Public premium bid (“bear hug”)
EasyJet	Castlakel & Apollo	Active pursuit / takeover interest

British firms have absorbed a combined £44bn in public takeover bids, frequently characterized as “bear hugs” where acquirers force target boards to entertain higher valuations.

Regulatory Friction and the Consolidated Tape Roadmap

Industry advocates argue that the government’s focus on financial services has slipped down the legislative priority list.

Previous interventions, such as former Chancellor Rachel Reeves introducing a three-year stamp duty holiday on shares for newly-listed companies, aimed to stimulate primary issuance. However, the path forward relies heavily on market data modernization. The FCA’s proposed “consolidated tape” initiative—slated for 2028—intends to aggregate fragmented trading data into a single, unified feed.

Yet, implementation hurdles remain contentious. LSEG executives have cautioned that the framework could inadvertently benefit institutional investors who opt out of contributing proprietary data, creating an uneven playing field. As the FCA refines its market oversight, the core challenge for London remains proving that its hidden depth can translate into sustained primary listings.

Disclaimer: The information provided in this article is for educational and informational purposes only and does not constitute financial advice.