Onchinsuren is the Managing Partner and founder of Onch & Company, a leading professional services firm. In 1999, she was certified as one of only 18 individuals who passed the first internationally recognized CPA examination. She is also a Certified Tax Accountant with over 20 years of experience in the professional accounting industry. Before founding her own firm, she gained valuable experience working with Big 4 firms in both Ulaanbaatar and Moscow.

In 2004, Onchinsuren established Onch Audit, which has since evolved into a multi-functional firm offering audit, tax, and advisory services to prominent domestic and multinational clients. Onch Audit became a full member of Deloitte in January 2012, and under her leadership, Deloitte Onch thrived as a true local firm with Big 4 capabilities.

Onchinsuren is one of the few local auditors in Ulaanbaatar with Big 4 and international experience, predating the arrival of Big 4 firms in Mongolia. She has audited many of the country’s leading banks, including Khan Bank, and has significant expertise in tax consulting, particularly concerning Mongolian tax laws. Her clients include major multinational and national companies operating in Mongolia. Onchinsuren has also led numerous audit, tax, and advisory projects, including representing mining and exploration companies in various tax disputes.

A passionate advocate for tax and business reform, Onchinsuren has actively contributed to policy discussions. She has been involved in working groups for tax reform, providing recommendations to the Tax Authority and Ministry of Finance to improve the clarity and effectiveness of Mongolia’s tax legislation.

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Norjinbat is a CPA with over twenty years of experience spanning audit, financial advisory, practice management, and information systems integration. In 1999, he was one of the first 18 accountants to be certified as a CPA in Mongolia. He currently leads the Consulting practice at Onch & Co. while also serving as the CEO of the firm’s audit practice. In addition, Norjinbat is the founder and CEO of Onch Credit Rating Agency, a subsidiary of Onch & Co., which provides financial rating services for private companies issuing bonds and other securities.

Throughout his career, Norjinbat has spearheaded numerous audit, consulting, and advisory projects across diverse industries. He oversees accounting and tax compliance for clients, ensuring the preparation of financial statements in alignment with both IFRS and Mongolian statutory requirements. Norjinbat also leads the implementation of IFRS-compliant ERP systems and has been instrumental in guiding clients through Sage ERP implementation.

His expertise includes commercial due diligence (M&A), management accounting, financial reporting improvements, internal controls review and training, internal audit quality assessments, and IFRS consulting for both domestic and international clients. Norjinbat has worked with companies in the mining, financial services, government, and public sectors.

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Tserennadmid is the Advisory Director at Onch & Co., bringing over 10 years of experience in management consulting, forensic investigations, internal control and operational audits, financial due diligence for M&A, third-party risk management (TPRM), and ERP system implementation. She has worked across a diverse range of industries in Mongolia, including mining, financial services, construction, non-profits, retail, and the public sector.

She has worked at Deloitte UK’s Risk Advisory practice with a specialization in internal audit, supporting financial and operational control reviews for various clients.

Among her key projects, Tserennadmid led a large-scale internal audit engagement for a leading mining company, assessing internal controls and risk governance while providing recommendations for process improvements. She also played a key role in an extensive forensic investigation, supporting an external review through document analysis, interviews, and fraud risk assessment. Additionally, she led the successful implementation of an ERP system for major distribution, airline, and mining companies, ensuring operational efficiency and compliance.

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Tuvshin is the Director of the Tax Advisory practice at Onch & Co., bringing over 15 years of expertise in tax advisory and compliance. He has extensive experience advising clients across key industries, including energy, mining and metals, EPC, banking and finance, retail, and oil and gas.

A recognized expert in transfer pricing, Tuvshin has successfully led numerous transfer pricing engagements and audits, helping clients navigate complex regulatory requirements. He also specializes in expatriate and individual tax compliance, ensuring seamless tax solutions for international professionals and businesses operating in Mongolia.

Tuvshin holds a Bachelor of Laws (LL.B.) in commercial law from Otgontenger University in Ulaanbaatar and a Master of Laws (LL.M.) with a specialization in corporate and commercial law from NALSAR University of Law in Hyderabad, India.

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Uranbileg is a CPA with over 16 years of professional experience, specializing in tax and audit services across industries such as mining, banking, and real estate. As a Partner at Onch & Co., she leads the Audit and Advisory practice, having held various leadership roles within the firm since 2008. She is also an ACCA-certified professional.

Her expertise includes serving as an Audit Manager at Deloitte’s Hong Kong office, where she led audit engagements for both local and international financial services clients, including banks, investment funds, and fund administrators.  

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