Conor O'Sullivan

Financial Controller at Merus

Amsterdam, North Holland, Netherlands

About

Experience

  • Financial Controller at Merus N.V.
    Jul 2025 - Present · 1 yr 1 mo

    Merus is a biotech company working towards discovering and developing new treatments for cancer using antibody technology. Since Dec 25 they’ve been acquired by Genmab. Prepare and execute monthly accounting transactions, including journal entries for Preclinical, and pre-paid expenses, ensuring detailed tracking and reconciliation on a monthly basis. Work closely with accounting peers, internal project managers, and other stakeholders like critical vendors, supply chain and vendor management to align on transactions and track purchase orders (POs) and Contracts. Oversee the accuracy of financial documents, including (Pre) Clinical & a new US entity Full ownership and management of Fixed Assets Manage and execute SOX controls, ensuring adherence to internal control guidelines, and maintain documentation for audits. Lead initiatives for internal control and process improvements, aiming to enhance efficiency and accuracy in financial operations. Engage with both internal teams and external specialists, including auditors and SOX specialists, to support financial operations and compliance.

  • Senior Financial Accountant at MessageBird
    Jul 2019 - Jul 2025 · 6 yrs 1 mo

    • Very dynamic & challenging culture with alot of change. • Continuous identification of necessary process improvements as needed, incorporating as much automation as possible. • Preparation/review of Financial Statements and liaising and engaging with external auditors. Steering Singapore audits • Monthly monitoring of the margin per product sold (KPI) , in collaboration with the Revenue Accountant. Any flux fully explained to be reported to the Board. • Full explanation needed for all areas of the general ledger, with good comms with various areas of the business maintained. Providing role of ‘Finance Business Partner’ • Full ownership of the accrual/reporting the Cost of Goods sold, driven mainly by hundreds of telecommunication providers sending SMS and voice messages for Bird. Quite complex, but simplified through automation • Month end balance sheet reconciliations for all types of balance sheet items, including but not limited to AP, AR, VAT, Fixed Assets, Prepayments and Accruals. Also MoM flux analysis for the P&L, as well as QoQ and YoY. • Key point of contact in Finance for various departments, including Legal, Engineering and Connectivity. Ad-hoc reports/assistance provided as needed • GST/VAT preparation for APAC entities, in line with tax dept/external tax accountants • Over 5 years of using Netsuite accounting software, hence very comfortable and proficient with same

  • Accountant at Coravin
    Aug 2018 - Jul 2019 · 1 yr

    • Dynamic start up environment, requiring much on-the-spot decisions and problem solving • Posting and reconciling all European banks • Reconciling and matching Accounts Payable, and Accounts receivable utilising complex matching systems • Preparation of vendor payments, and managements of all Accounts Payable • Overview, reconciliation and posting of all inventory movement to and from the warehouse, including assembly of goods • Monthly analysis, declaration and payment of all Sales/Purchasing VAT in Europe, including Netherlands, France, Germany and United Kingdom • Full ownership in re-building the monthly Sales analysis and VAT file, which has just been completed. • Identification and posting of necessary accruals and journals for all P&L and Balance sheet items • Month end balance sheet reconciliations, and profit and loss flux analysis • Ad-hoc accounting tasks as required

  • Financial Accountant at Lightspeed HQ
    May 2017 - Aug 2018 · 1 yr 4 mos

    • Full responsibiliy for all financial affairs for the Belgian and UK entities • Reconciliation of all banks under both entites • Separate complex AR postings, using payment links from from banks to Salesforce, then to Netsuite, each bank having different methods due to system limitations • Reviewing and preparation of Accounts Payable for both entities • Identification and posting of necessary accruals, prepaid, and amortization. • Monthly MoM analysis of all expenses and balance sheet items per department • Monthly reconciliation and posting of inventory received and sent from our Belgian premises and associated warehouse • Monthly posting and reconciliation of the salaries, including adjustments for vacation accrual, 13th month and bonus paid • Monthly reconciliation between Salesforce (where AR is updated by Billing Dept) and Netsuite (which Finance use) • Continuous identification of necessary process improvements • Fast paced, dynamic and ad-hoc working environment

  • GL Accountant at The Student Hotel
    Oct 2016 - May 2017 · 8 mos

    • Full ownership of all bank account booking (30 accounts) and reconciliation for multiple entities • Posting and reconciliation of monthly salaries • Management of the expenses paid, including ensuring these are expensed correctly • Posting of the daily revenue journals from the Hotels to the GL (Exact) • Management and clearing of the suspense accounts • Booking of intercompany invoices • Posting of monthly salary/hours worked stats for comparison against the budget • Posting of journals as needed