In the ever-evolving world of foreign exchange (FX) trading, the ability to navigate liquidity challenges and optimize execution is paramount. The Siege FX platform has gained prominence in the FX trading landscape, particularly in the realms of Scandinavian currency pairs and Emerging Market FX, where liquidity is scarce, and spreads are wide. This article delves into the factors contributing to the platform’s success and the unique advantages it offers to traders in these challenging markets.
The rise of Dark Pools in FX trading
One of the key themes, highlighted in our FXAlgoNews August 2024 article (https://fxalgonews.com/exploring-the-benefits-of-all-to-all-dark-midmatching-in-algo-fx-execution/) was the growing significance of dark pools in algorithmic FX execution. Dark pools, such as the Siege MidPool, have become increasingly meaningful due to their ability to provide a source of liquidity and value without the market impact associated with traditional ‘lit’ markets. The Siege MidPool, with match rates exceeding 30%, has proven to be a valuable tool for both Buy-side and Sell-side traders.
Scandinavian currency pairs: Navigating liquidity challenges
Scandinavian currencies: Swedish Krona (SEK), Norwegian Krone (NOK), and Danish Krone (DKK), are more challenging and expensive to trade due to their relatively lower liquidity and wider spreads compared to major markets. “Scandi” traders are already used to taking more time to manage market impact and that behaviour readily translates into success in the Siege MidPool. We see participants rest Scandi orders for several minutes to achieve match rates in the 50 to 100% range; each clip traded at a floating mid without information leakage. Several factors underpin Siege’s status as a trusted environment for traders. Anti-polling measures reinforce the desired behaviour that participants come to move risk quietly and the central counterparty model, provides anonymity. Then the use of independent FCA-regulated mid-rates from New Change FX ensures transparency and fairness in pricing.
Emerging market FX: Overcoming wider spreads
Even lower liquidity and wider spreads in Emerging Market FX result in an even more challenging environment for traders. Deliverable currencies like PLN, CZK, HUF, ZAR and MXN are often difficult to trade in the lit market where any activity is quickly spotted by others to the trader’s cost. Spreads themselves are less stable, especially outside of local market hours, which again makes the Siege MidPool an attractive proposition for moving risk without moving markets.
The role of Transaction Cost Analysis (TCA) and execution analytics
The growing use of Transaction Cost Analysis (TCA) and execution analytics in FX trading has played a crucial role in driving interest in dark pools like the Siege MidPool. TCA allows Buy-side traders to compare outcomes from different liquidity and algo providers, taking into account total costs, including market impact. This has led to a greater appreciation of the benefits of trading over time and the value dark mid-matching can deliver to boost those savings.
The Siege FX platform conducts its own mark-out analysis against NCFX mid-rates, demonstrating that MidPool order submission does not result in information leakage and thus market impact. This transparency and data-driven approach has been key to building trust and encouraging greater participation in the platform. As more traders recognise the advantages of dark mid-matching, the Siege MidPool continues to gain momentum and attract ever more liquidity.

Building strong partnerships and ecosystem integration
The success of the Siege FX platform can also be attributed to its strong partnerships with both Buy-side and Sell-side participants. The platform’s targeted approach to engaging Sell-side algo providers has resulted in robust partnerships with banks, which in turn has facilitated greater access to liquidity for Buy-side traders. Algo strategies package a workflow solution with execution flexibility and so offer a great entry point to Siege MidPool liquidity.
Ease of connectivity and workflow integration have also been critical factors in the platform’s success. By providing seamless integration with existing trading systems and workflows, the Siege FX platform has made it easier for traders to access the MidPool.
Some participants, understanding that larger MidPool orders may not match 100%, asked us to look at ways to help them complete orders without manual intervention. We are therefore now able to offer order routing to a “Low Impact Pool” of internalising liquidity providers through our existing MidPool workflow. This can be configured on a regular MidPool Market or Limit order as a backstop that triggers on a defined residual order balance or as a more structured execution through the FulFill order type. Responding to this demand has led us to form new partnerships to continue to deliver high execution quality with increased convenience.
Future growth prospects and opportunities
The MidPool’s success has been proven through challenging market conditions to deliver value to traders. Looking ahead, we are still excited by the growth prospects for the platform in deliverable Spot and Precious Metals. Next our experience in EM FX suggests that there is potential to extend the MidPool to Non-Deliverable Forwards (NDFs) and we are also working on something new for FX Swaps trading. Ongoing conversations with partners also suggest that this could open up new services to help participants reduce the growing costs of trading across portfolios and holding positions on balance sheet with counterparties.

Conclusion
The Siege FX platform has emerged as a new bright star in the FX market structure, with notable success in the challenging domains of Scandinavian currency pairs and Emerging Market FX. By leveraging the power of dark pools and innovative in-house technology, the platform has delivered FX traders the ability to move risk without moving markets. The platform’s growth and new services will keep it at the forefront of the FX trading industry, providing value and success to its participants and partners.

