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    Expert perspectives on trading technology, market infrastructure, risk management, and regulatory compliance.

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    Trading Technology

    Smart Order Routing (SOR): How It Works

    A complete guide to smart order routing for broker-dealers and prop firms. What an SOR actually does, how routing decisions get made, and SOR vs DMA. Plus the main routing strategies, the Reg NMS and 15c3-5 obligations behind them, and the questions to ask any vendor.

    July 30, 202617 min read
    Regulatory Compliance

    CAT and CAIS in Late July 2026: Four Filings That Widen Your Reporting Surface

    A new exchange joining the CAT NMS Plan, a TRACE indicator change, two SEC information-collection extensions, and an FICC filing on regulatory information requests. Individually routine. Together, a clear signal about where reporting scrutiny is heading.

    Jul 30, 20267 min read
    Risk & Compliance

    Margin Just Became a Real-Time System Problem

    FINRA's 20 new Rule 4210 interpretations landed weeks before the intraday margin amendments took effect. The conceptual debate is over — what's left is an engineering problem inside the order path.

    Jul 28, 20269 min read
    Risk & Compliance

    SEC Rule 15c3-5 (Market Access Rule): A 2026 Compliance Guide for Broker-Dealers

    What SEC Rule 15c3-5 requires in 2026 — pre-trade risk controls, financial and regulatory checks, direct market access oversight, annual CEO certification, and the technology choices that make compliance defensible.

    Jul 24, 202611 min read
    Regulatory Compliance

    Consolidated Audit Trail (CAT) Reporting in 2026: A Compliance Overview for Broker-Dealers

    A plain-English guide to CAT reporting in 2026 — what industry members must report, CAIS customer and account data, error correction timelines, common exam findings, and how to build a defensible reporting stack.

    Jul 24, 202612 min read
    Trading Infrastructure

    How to Choose a FIX Connectivity Network in 2026

    A practical, vendor-neutral buyer's guide for bank IT and trading infrastructure leaders — low-latency performance, multi-venue access, compliance controls, client onboarding, and build vs. buy.

    Jul 21, 202612 min read
    Market Structure

    T+1 Settlement: What Broker-Dealers, Prop Firms, and Fintechs Need to Know

    A practical guide to operating under T+1 settlement — compressed affirmation windows, funding implications, fails management, and the technology choices that separate firms that thrive from those that scramble.

    Jun 24, 20269 min read
    Trading Technology

    OMS vs EMS: Order Management vs Execution Management Systems Explained

    What's the real difference between an Order Management System (OMS) and an Execution Management System (EMS)? A practical guide for broker-dealers, prop firms, and hedge funds choosing — or combining — the two.

    Jun 11, 202610 min read
    Regulatory

    FINRA Replaces the Day Trading Margin Rule with New Intraday Margin Standards

    The SEC has approved sweeping amendments to FINRA Rule 4210, retiring the decades-old Pattern Day Trader framework in favor of a modern, risk-based intraday margin regime. Here's what broker-dealers need to know.

    Apr 17, 20269 min read
    Regulatory

    The End of the $25K PDT Rule: What It Means for Retail and Active Traders

    With FINRA retiring the Pattern Day Trader framework, the $25,000 minimum equity requirement is gone. Here's how the shift to intraday margin standards reshapes the experience for retail brokers, active-trader platforms, and the customers they serve.

    Apr 16, 20268 min read
    Trading Technology

    The Complete Guide to Order Management Systems for Broker-Dealers in 2025

    How modern OMS platforms are transforming trade execution, compliance, and operational efficiency for broker-dealers and prop trading firms.

    Mar 15, 202511 min read
    Infrastructure

    FIX Protocol: Building Reliable Trading Infrastructure for High-Volume Firms

    A deep dive into FIX protocol implementation, session management, and how modern FIX engines power institutional trading.

    Feb 28, 202510 min read
    Risk & Compliance

    Real-Time Risk Management: How Trading Firms Prevent Catastrophic Losses

    Explore pre-trade risk controls, position monitoring, and regulatory compliance frameworks that protect trading firms from market risk.

    Feb 10, 20259 min read
    Trading Technology

    Building the Ideal Prop Trading Technology Stack in 2025

    From execution management to risk controls and back-office operations—what prop trading firms need in their technology stack.

    Jan 22, 202511 min read
    Operations

    Modernizing Clearing Technology: From Legacy Systems to API-First Platforms

    How clearing firms and self-clearing broker-dealers are replacing legacy technology with modern, API-driven clearing platforms.

    Jan 8, 202512 min read
    Risk & Compliance

    Automating Regulatory Reporting: CAT, OATS, and Beyond

    How fintech firms are automating regulatory reporting to reduce costs, minimize errors, and stay ahead of compliance requirements.

    Dec 18, 202410 min read

    Trading Technology Knowledge Base

    Stay ahead with expert insights on order management systems, FIX protocol infrastructure, pre-trade risk controls, clearing and settlement technology, and regulatory compliance automation. Whether you're evaluating alternatives to Sterling Trading Tech, DAS Trader, Interactive Brokers, or Clearstreet, our technical guides help you make informed decisions.

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    About this blog

    Written for the people who run the stack

    This blog covers the working layer of capital-markets technology: how order and execution management systems hold order state, how FIX sessions behave under load and during recovery, what pre-trade risk has to prove under SEC Rule 15c3-5, how CAT and CAIS reporting fails and why, and what a compressed settlement cycle does to back-office operations.

    The guides are written for technology, operations, and compliance teams at broker-dealers, proprietary trading firms, and hedge funds — the people who own the consequence when a session drops, a limit is evaluated against a stale price, or a reporting deadline is missed. That means specification detail, deadlines, and architecture trade-offs rather than market commentary. Where a rule or technical specification changes, we revise the existing guide rather than publishing a near-duplicate, and every post is available through the RSS feed newest first.

    Who writes these guides and who are they for?

    They are written by the engineers and operations people who build and run Gato's OMS, FIX connectivity, risk, and reporting modules, for the technology, operations, and compliance teams inside broker-dealers, proprietary trading firms, and hedge funds.

    The bias is toward implementation detail over market commentary.

    What topics does the blog cover?

    Order and execution management (OMS vs EMS, smart order routing, order state), FIX protocol and connectivity architecture, pre-trade risk under SEC Rule 15c3-5, margin under FINRA Rule 4210, CAT and CAIS reporting, and post-trade operations including T+1 settlement, corporate actions, and reconciliation.

    How often are new guides published?

    New guides go up as regulatory and technical developments warrant, typically several times a month, with existing guides revised when a specification or effective date changes rather than left to age.

    Can I follow the blog by feed or email?

    Yes. Every post is published to the RSS feed at /rss.xml, newest first, so it can be pulled into a reader or an internal digest.

    Get in touch if you would prefer regulatory-deadline updates by email.