Senior Associate, Investment Operations

About the role

Mariner is seeking talented candidates for a full-time Associate/Senior Associate, Investment Operations to join our team. This role is instrumental in supporting the operational infrastructure that drives successful investment strategy implementation and ongoing management across client accounts. You will oversee account onboarding and maintenance, facilitate trading and settlement processes, administer investment and portfolio management platforms, and serve as a primary operational resource for our investment and wealth management teams. We are looking for someone with excellent analytical and organizational skills, meticulous attention to detail, and a comprehensive understanding of investment operations and trading support. The ideal candidate thrives in collaborative environments, working closely with investment, trading, operations, custodial, and wealth teams to ensure accuracy, resolve complex issues, and continually enhance processes for greater efficiency, scalability, and client satisfaction.

Responsibilities

• Oversee onboarding of new accounts (Equities, Fixed Income, Options, Structured Notes, etc.) into internal systems such as Orion, Salesforce, and Moxy.
• Address new account processing requests from advisors and trading teams before enrollment into Mariner strategies.
• Process closed accounts across multiple trading platforms, following direction from advisors and the investment team.
• Set up securities across various platforms and resolve set up issues in Orion, including security classifications and characteristics.
• Manage account restrictions both during onboarding and as recommended by advisors and investment leads.
• Complete daily reconciliation of trading platforms (Moxy, Perform, FixFlyer).
• Ensure timely trade settlement by collaborating with Investment teams, custodians, and brokers, and resolving any related issues.
• Serve as a key contact and subject matter expert for investment and trading queries from wealth management teams.
• Assist with monthly composite return calculations and quarterly fact sheet preparation.
• Conduct regular quality control checks on trading platforms.
• Organize and maintain investment-related documents in Box, including fact sheets, educational content, process documents, and manager ADVs.
• Participate in continuous improvement initiatives for operational processes.

Requirements

• 2+ years of experience in investment operations and/or trading support.
• Undergraduate degree in a business-related field preferred.
• Experience with options trading and options account setup at custodians preferred.
• Proficient in portfolio management and trading platforms (Orion, Perform, Moxy, FixFlyer, Charles River).
• Experience with Salesforce.
• Experience with new account paperwork and processing at custodians such as Fidelity, Schwab, and Pershing.
• Knowledge, Skills, and Abilities
• Strong understanding of wealth management operations and trading.
• Excellent verbal and written communication skills.
• Strong problem-solving and critical thinking abilities.
• Ability to manage multiple tasks with appropriate urgency.
• Highly organized with proven analytical skills.
• Positive attitude, quick learner, and self-starter.
• Comfortable working in a fast-paced, evolving environment.
• High aptitude for change management.
• By submitting your application, you agree to the collection and use of your personal information as described in our Employee and Applicant Privacy Notice .
• EOE M/F/D/V

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