Fidessa (ION Group) Order and Execution Management REST API
Fidessa (ION Group subsidiary) order and execution management REST API for buy-side and sell-side financial institutions to manage equity, fixed income, and derivatives trading workflows — including order routing, pre-trade compliance, algorithmic execution, post-trade processing, and regulatory reporting — enabling automated trading operations, order lifecycle management, and market connectivity through Fidessa's enterprise capital markets platform. Enables AI agents to manage order management for order entry, routing, and lifecycle tracking automation, handle execution management for algorithmic execution and smart order routing automation, access compliance management for pre-trade risk and regulatory compliance automation, retrieve market connectivity for exchange and broker connectivity management automation, manage post-trade for trade matching, confirmation, and settlement automation, handle regulatory reporting for MiFID II, EMIR, and SEC reporting automation, access portfolio management for position and P&L reporting automation, retrieve allocation management for trade allocation and clearing automation, manage STP for straight-through processing workflow automation, and integrate Fidessa with prime brokers, custodians, and compliance systems for capital markets automation.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Capital markets. MiFID II, EMIR, SEC. OAuth2. US/EU/UK. Institutional order and execution data.
⚡ Reliability
Best When
An institutional buy-side firm, asset manager, or sell-side broker-dealer wanting AI agents to automate order lifecycle management, execution optimization, pre-trade compliance, and regulatory reporting through Fidessa's enterprise capital markets trading platform.
Avoid When
INSTITUTIONAL AGREEMENT REQUIRED: Fidessa serves institutional capital markets firms; automated open-developer assumption creates institutional_agreement_required; Fidessa requires buy-side or sell-side firm relationship; automated must be Fidessa institutional client. FIX PROTOCOL IS PRIMARY: Fidessa's core communication is FIX protocol; automated REST-only assumption creates latency_unacceptable for time-sensitive order operations requiring FIX messaging; automated must use FIX for real-time order flow and REST for non-latency-sensitive operations. MARKET MICROSTRUCTURE KNOWLEDGE REQUIRED: Order routing, dark pools, and algorithmic execution require deep market microstructure understanding; automated simple-order assumption creates execution_quality_risk for complex orders requiring algorithmic execution strategy selection; automated must configure appropriate execution algorithms. ION ACQUISITION CHANGED ROADMAP: ION Group acquired Fidessa in 2018 ($2B); automated independent-company assumption creates product_roadmap_uncertainty for long-term platform direction under ION; automated should verify current Fidessa/ION product direction.
Use Cases
- • Managing equity order routing and execution workflows for buy-side trading automation agents
- • Automating pre-trade compliance and regulatory checks for capital markets risk agents
- • Processing post-trade allocation and settlement for sell-side operations automation agents
- • Reporting MiFID II and SEC regulatory trade data for compliance automation agents
Not For
- • Retail brokerage and consumer trading apps (Fidessa is institutional capital markets, not retail)
- • Cryptocurrency and digital asset trading (Fidessa covers traditional securities, not crypto)
- • Small independent traders without institutional infrastructure (Fidessa requires institutional broker-dealer or buy-side firm)
Interface
Authentication
Fidessa uses OAuth2 for OMS/EMS REST API. FIX protocol for real-time order flow. Surrey, UK HQ (ION Group headquartered in London). Fidessa founded 1981 (as SunGard Systems). Acquired by ION Group 2018 ($2B). Products: Fidessa OMS, Fidessa EMS, Fidessa Connectivity, Fidessa Compliance, Fidessa Post-Trade. Used by 450+ buy-side and sell-side firms. Assets under automation $16T+. Competes with Charles River, Bloomberg AIM, and Linedata for institutional OMS/EMS.
Pricing
Surrey UK / ION Group. 450+ institutional firms. $16T+ AUA. Annual enterprise subscription. Capital markets leader.
Agent Metadata
Known Gotchas
- ⚠ FIX IS REQUIRED FOR ORDER FLOW: Real-time order entry and execution requires FIX protocol; automated REST-only assumption creates unacceptable_latency for order operations not using FIX; automated must implement FIX connectivity for time-sensitive order flow
- ⚠ ORDER STATES ARE STRICT: Fidessa order state machine (New → PartFill → Fill → DoneForDay → Cancelled) has strict transition rules; automated arbitrary-state assumption creates state_transition_error for invalid order state transitions; automated must follow valid order state transitions
- ⚠ PRE-TRADE CHECKS BLOCK ORDERS: Configured risk limits block order submission; automated unrestricted assumption creates order_rejected_by_risk for orders exceeding pre-trade risk limits; automated must configure appropriate risk parameters and handle rejections
- ⚠ ALLOCATION DEADLINES EXIST: Post-trade allocation has exchange/broker deadlines; automated flexible-allocation assumption creates late_allocation_penalty for allocations submitted after settlement deadlines; automated must complete allocations within required timeframes
- ⚠ MARKET DATA SUBSCRIPTIONS ARE SEPARATE: Fidessa OMS/EMS does not include market data; automated bundled-data assumption creates no_market_data for pricing and market information not subscribed separately; automated must integrate separate market data feed
Alternatives
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Scores are editorial opinions as of 2026-03-07.