Nasdaq PHLX LLC, a self-regulatory organization operating under the Securities Exchange Act of 1934, filed a proposed rule change on March 3, 2026, to expand its co-location services. The filing, detailed in the Federal Register on March 19, 2026, introduces new cabinet and power options in the exchange's expanded data center, specifically in the NY11-5 area. This development addresses growing demands for higher computing power and efficient cooling in financial markets, where co-location allows market participants to place their servers near exchange systems for reduced latency. The proposal became immediately effective under Section 19(b)(3)(A) of the Act, with the Securities and Exchange Commission soliciting comments until April 9, 2026. By offering liquid-cooled cabinets, PHLX aims to provide optional enhancements that could optimize space and performance for users, reflecting broader trends in data center technology amid increasing electronic trading volumes.
Background on Co-Location Services
Co-location services enable market participants, such as trading firms and vendors, to house their equipment in close proximity to an exchange's matching engine. This setup minimizes delays in order transmission, a critical factor in high-frequency trading environments. Nasdaq PHLX currently operates its data center in Carteret, New Jersey, divided into sections including the original NY11, expansion NY11-4, and the forthcoming NY11-5. Existing rules under General 8, Section 1 outline cabinet options with air cooling and various power circuits, ranging from 20 amp to 40 amp in single or three-phase configurations. These services are voluntary, and participants can opt for direct co-location or indirect access through third-party providers. The proposal builds on this framework by introducing innovations tailored to NY11-5, responding to customer needs for denser computing setups without altering core trading mechanics.
Details of the Proposed Changes
The core of the filing involves two main expansions: a new liquid-cooled cabinet option and additional power circuits exclusive to NY11-5. Liquid cooling uses pipes to circulate chilled water or coolant to equipment, offering superior heat dissipation compared to traditional air cooling. As stated in the filing, 'liquid cooling is more efficient and enables space optimization in ways that air cooling methods would struggle to support.' Customers can choose Nasdaq-provided cabinets or supply their own, a flexibility not available for air-cooled options due to the specialized infrastructure required. This service is limited to NY11-5 because the necessary liquid-cooling setup is unavailable elsewhere in the data center.
On the power side, the proposal extends five existing circuit options—Phase 1 20 amp 240 volt, Phase 1 32 amp 240 volt, Phase 1 40 amp 240 volt, Phase 3 20 amp 415 volt, and Phase 3 32 amp 415 volt—from NY11-4 to liquid-cooled cabinets in NY11-5. It also adds two new high-power options: Phase 3 40 amp 415 volt and Phase 3 60 amp 415 volt, capable of supporting 29-43 kW. These are restricted to liquid-cooled setups, as air cooling cannot efficiently handle such densities. The filing notes that 'customers choose power based on their preferences and capacity needs,' emphasizing that no option is inherently superior, and all remain available on equal terms. Fees for these services are pending a separate filing, with implementation targeted for the first quarter of 2026, around April 3, subject to potential adjustments announced via customer portals.
Statutory Basis and Regulatory Justification
PHLX asserts that the proposal aligns with Section 6(b)(5) of the Securities Exchange Act, which requires rules to promote just and equitable principles of trade, remove impediments to a free market, and protect investors. The exchange argues that the new options enhance customer choice by allowing greater computing power within the same footprint, stating, 'Liquid-Cooled Cabinets would allow data center customers to install more of the computing equipment... because liquid cooling is more efficient at dissipating heat.' It emphasizes voluntariness, noting that participants can forgo co-location entirely or use alternatives. Regarding competition, the filing claims no undue burden under Section 6(b)(8), as services are offered non-discriminatorily and do not affect trading speeds or relate to ongoing initiatives like the Equalization Project. PHLX highlights that it is, to its knowledge, the first national securities exchange to offer liquid-cooled cabinets, potentially setting a precedent without restricting rivals' abilities to innovate.
Perspectives and Implications
Stakeholders may view this proposal differently. Market participants favoring advanced infrastructure could see it as a boon for efficiency, enabling denser server deployments that support complex algorithms and data processing. Critics, however, might question whether it creates disparities, though the filing counters this by affirming equal access. Short-term implications include potential shifts in co-location demand toward NY11-5, with orders accepted in advance to manage capacity. Long-term, this could influence data center standards across exchanges, prompting others to adopt similar technologies amid rising energy costs and environmental concerns over cooling efficiency. Regulatory perspectives, as invited by the SEC, may focus on ensuring fairness, with no prior comments noted in the filing. Precedents like prior SEC approvals of co-location expansions (e.g., similar filings by Nasdaq affiliates) suggest a supportive framework, provided proposals maintain market integrity.
In summary, this proposal represents a targeted enhancement to PHLX's co-location ecosystem, grounded in customer-driven innovation. Potential next steps include the SEC's review of comments and possible suspension within 60 days if public interest concerns arise. Ongoing debates may center on balancing technological advancement with equitable access, while challenges could involve infrastructure scalability and fee structures in a competitive landscape. These trajectories highlight the evolving intersection of finance and technology, where adaptations like liquid cooling could reshape market infrastructure without definitive outcomes yet clear.
