Liquidnet has brought its algorithmic trading capabilities together under a new proposition, Meridian, as institutional equity traders face an increasingly complex liquidity landscape spanning lit and dark venues, bilateral liquidity and other execution mechanisms.
The launch is the culmination of an 11-year expansion of Liquidnet’s electronic trading business. Meridian combines its algorithms, analytics, quantitative services and execution expertise with access to the firm’s approximately $100 billion dark pool, more than 166 external lit and dark venues and a growing bilateral liquidity network across 56 countries.Electronic execution now accounts for around half of Liquidnet’s business, according to Chris Jackson, Global Head of Equities at Liquidnet. Around 800 of its institutional clients use its electronic products daily, while its algorithms currently feature on 88 algo wheels globally.
“If you look at what’s happened over the last three or four years, we’re fundamentally in a different place with this platform, business and offering than we were three years ago,” Jackson tells TradingTech Insight. “Bringing all of those things together is why we’ve introduced the Meridian name, to encapsulate the work that’s gone on.”
A changing liquidity landscape
The launch comes as the structure of European equity liquidity continues to evolve. An ESMA analysis published in April found that addressable liquidity remained relatively stable at around 85% of total trading volume between 2022 and 2025, but activity continued to shift away from lit continuous trading towards closing auctions, frequent batch auctions and systematic internalisers.
For institutional investors, that dispersal creates a more complex execution problem. Connecting to more venues doesn’t necessarily make liquidity easier to find, particularly when substantial institutional interest may not appear as immediately executable orders in the market.
Jackson illustrates the problem using Liquidnet’s own network. “Every day we have globally about $100 billion of resting liquidity from institutional asset managers in our dark pools,” he says. “We cross about $7 billion of that, which leaves roughly a $93 billion problem: the uncrossed inventory. That’s buyers looking for sellers and sellers looking for buyers, and it’s a good summary of the institutional asset manager’s liquidity challenge.”Meridian is intended to help traders navigate those different sources rather than treat liquidity purely as a venue-routing problem. Liquidnet’s own pool is combined with external markets and an expanding layer of bilateral risk liquidity.
“The evolution of bilateral risk is another dimension of liquidity that has grown significantly and been distributed very efficiently through electronification,” notes Jackson. “It isn’t appropriate in every trading situation, but it should certainly be in your armoury of destinations or liquidity sources that you can leverage to get your order done.”
Searching beyond visible liquidity
Meridian’s liquidity-seeking algorithm, Barracuda, is designed to search across lit, dark and alternative liquidity while limiting information leakage and market impact. Its interaction with Liquidnet’s network means that the search isn’t necessarily restricted to orders currently resting in the pool.
One of the more distinctive elements of its approach is the ability to search for institutional liquidity across time as well as across execution destinations. “Our algorithmic platform doesn’t just look in our own pool for liquidity that’s there at that moment,” Jackson explained. “If you’re a buyer looking for a seller and there’s no seller in the pool in real time, the algorithm has the ability to approach sellers that may have been in the pool yesterday.”
Liquidnet’s internal performance data provide some indication of the potential execution impact. Year-to-date in EMEA, the firm says Barracuda has reduced execution time by 66% against a 10% participation-of-volume benchmark, with execution time of 44 minutes compared with an estimated 130 minutes. Liquidnet also says the algorithm outperformed expected market impact by 8.4 basis points, with 17% of executed value sourced from Liquidnet liquidity.
Those figures are based on Liquidnet’s own Barracuda performance analysis rather than an independent benchmark, but they illustrate the role the firm sees differentiated liquidity playing alongside conventional venue access.
AI with human oversight
AI is another component of Meridian and of Liquidnet’s broader electronic trading technology strategy. The firm is already using AI in algorithm development, where Jackson says it has accelerated the software development lifecycle and the interaction between quantitative and technology teams.
It is also being applied to execution analytics. Liquidnet’s AI-based First Mate technology continuously analyses client order flow and real-time market structure, generating strategy-change recommendations for its algorithmic coverage teams. The system can perform complex analysis almost instantaneously, but the recommendations remain subject to human oversight rather than being automatically fed into execution decisions.
Jackson sees significant scope for advanced AI technologies across the trading workflow while drawing a more cautious line around their use inside the decision logic of regulated execution algorithms, where predictability, reconstruction and explainability remain important.
“If you build AI into that process, there’s a danger that it’s no longer deterministic,” he points out. “We’d be very cautious about relying on that when we have clear regulatory and best-execution obligations. And it isn’t just regulators: we have to be able to justify our actions to our clients as well.”
Better visibility, continued fragmentation
The European market structure around these technologies is also changing. In July, ESMA authorised EuroCTP to operate the EU consolidated tape for shares and ETFs, with a transition period running until 30 September 2026 for completion of the operational and technical arrangements. The tape will combine pre- and post-trade information from multiple contributors into a single stream, providing market participants with a consolidated view of trading activity. That should improve visibility across the European market, but consolidating information about trading activity doesn’t consolidate the underlying liquidity. Execution technology will still need to determine where liquidity can be found, whether interacting with it is appropriate for a particular order, and how to minimise market impact and information leakage.
It is against this increasingly diverse execution landscape that Liquidnet is seeking to position Meridian. The firm remains strongly associated with institutional block trading, but the new proposition brings its wider electronic capabilities under a single identity, spanning algorithms, analytics and access to multiple forms of liquidity.
Jackson also points to a broader multi-asset electronic strategy over the longer term, although there are no immediate plans to extend Meridian beyond equities. For now, the focus is on applying those capabilities to an equity market in which finding liquidity increasingly requires traders to look beyond the conventional order book, across different venues, counterparties and execution models.
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