Senior Accountant

Our employees are truly our greatest asset. We have spent years building a team of talented, dedicated technologists, data-driven traders, and expert leaders with an emphasis on our core pillars:
People, Process, Trading Edge, and Technology. Simplex is an in-office organization, helping to foster a collaborative and communicative culture.

Simplex Trading is seeking a motivated, detail-oriented Senior Accountant to join our Finance team in our Chicago, Illinois office. This is a full-time, in-office position. The Senior Accountant will play a critical role in maintaining the accuracy and integrity of the firm’s financial records, supporting regulatory compliance, and driving process improvements across our accounting function. The ideal candidate has experience in a broker‑dealer or financial services environment, a strong command of GAAP, and a proactive mindset for identifying and implementing efficiencies.

• Own and execute the monthly and quarterly close process, including journal entries, account payable, account reconciliations, and variance analysis
• Maintain the general ledger and ensure accuracy and completeness of all financial data
• Coordinate with Accountant, operations and trading teams to reconcile trade invoicing

• Maintain working knowledge of applicable SEC and FINRA financial responsibility rules, including SEC Rules 15c3-1, and ensure the firm remains in compliance. Prepare monthly and quarterly FINRA reporting in a timely and accurate manner.
• Liaise with external auditors, regulators, and compliance personnel as needed

• Assist in the preparation of federal, state, and local tax returns and estimated tax payments
• Support the annual tax provision process and maintain tax-related work papers and documentation
• Coordinate with external tax advisors on tax planning and compliance matters
• Monitor changes in tax legislation relevant to broker‑dealers and proprietary trading operations

• Prepare accurate monthly, quarterly, and annual financial statements in accordance with GAAP
• Support the preparation of management reports and financial analysis for senior leadership
• Assist in the annual audit process, serving as a primary contact for external auditors and preparing audit schedules and supporting documentation
• Ensure financial reports are completed accurately and on schedule

• Own the firm’s credit card spend and expense reimbursement program, including policy enforcement, employee communication and monthly reporting.
• Identify opportunities to streamline and automate accounting processes
• Participate in the evaluation and implementation of accounting systems and technology
• Document accounting policies and procedures and recommend improvements to enhance internal controls
• Collaborate cross-functionally with technology and operations teams on finance‑related system initiatives

• Bachelor’s degree in Accounting, Finance, or a related field
• 4‑7 years of progressive accounting experience, preferably within a broker‑dealer, proprietary trading firm, or regulated financial services environment
• Willing to sit for FINRA licensing exams to ensure regulatory compliance with the scope of the role Strong working knowledge of GAAP and financial reporting standards
• CPA license (active)

• Experience with options, derivatives, or equity securities accounting, a plus
• Exposure to process automation tools or accounting system implementations such as Claude, Net Suite or Intacct
• Public accounting experience is a plus

Annual base salary ranges from $130,000 to $150,000, and is influenced by a number of factors, including qualifications and experience. This role is also eligible for an annual discretionary bonus, which can be a significant portion of total compensation. This full‑time role is also eligible for other forms of compensation and benefits including health/dental/vision insurance, and 401(k) contributions.

Sr. Accountant pay range: $130,000 — $150,000 USD

• Excellent a la carte Medical/Dental/Vision (free employee coverage!), 401(k)…