Idemitsu Kosan Executive and Leadership Team

May, 2026

Leadership Overview

Idemitsu Kosan has 5 executives leading key functions including operations, finance, and strategy.

Driven by innovation, Idemitsu Kosan is a Japanese petroleum company dedicated to producing and selling petroleum, oils, and petrochemical products, impacting the energy sector across Japan and beyond.

Leadership Roles at Idemitsu Kosan

  • Chief Financial Officer, Accounting Department & Finance Department & Senior Executive Officer - Noriaki Sakai
  • Senior Vice President and Chief Operating Officer - Brian Coulson
  • Representative Director, Executive Vice President & Chief Operating Officer - Susumu Nibuya
  • President & Director - Takashi Hadani
  • President - Toru Wada
  • Noriaki Sakai - Chief Financial Officer, Accounting Department & Finance Department & Senior Executive Officer

    Noriaki Sakai, the Chief Financial Officer, Accounting Department & Finance Department & Senior Executive Officer at Idemitsu Kosan, directs the company's financial health and strategic fiscal planning. Sakai oversees all aspects of financial management, including accounting, budgeting, and investment strategies, crucial for a major petroleum refiner. This role involves ensuring robust financial controls and reporting mechanisms across Idemitsu Kosan's diverse operations, from oil platforms to retail gas stations. Noriaki Sakai's expertise is vital in navigating the complex financial landscape of the energy sector, supporting the company's growth and stability. The Chief Financial Officer also collaborates closely with other executive leaders to align financial objectives with overarching business strategies, driving profitability and shareholder value. Sakai's leadership in the Accounting and Finance Departments ensures fiscal discipline and strategic resource allocation for Idemitsu Kosan.
    Noriaki Sakai

    Brian Coulson - Senior Vice President and Chief Operating Officer

    Brian Coulson, the Senior Vice President and Chief Operating Officer at Idemitsu Kosan, directs critical operational functions for the Japanese petroleum company. Coulson oversees the day-to-day activities across oil platforms and refineries, ensuring efficient production and distribution of petroleum, oils, and petrochemical products. This leadership role involves managing the complex logistics of Idemitsu Kosan's extensive network, including its branded gas stations. Brian Coulson's focus remains on optimizing operational performance and maintaining the high standards expected in the refining industry. The Senior Vice President and Chief Operating Officer drives initiatives to enhance productivity and cost-effectiveness throughout the company's value chain, directly supporting Idemitsu Kosan's position as a leading refiner in Japan. Coulson's strategic oversight ensures seamless integration of all operational facets, from extraction to retail sales, contributing significantly to the company's market presence and reliability.

    Susumu Nibuya - Representative Director, Executive Vice President & Chief Operating Officer

    Susumu Nibuya, the Representative Director, Executive Vice President & Chief Operating Officer at Idemitsu Kosan, spearheads core operational strategies and governance. Nibuya's extensive responsibilities encompass the strategic direction and execution of Idemitsu Kosan's refining and petrochemical operations, ensuring alignment with corporate objectives. As a key figure in the company's leadership, Susumu Nibuya guides the management of oil platforms, refineries, and the production and sale of vital petroleum and petrochemical products. The Executive Vice President & Chief Operating Officer also plays a crucial role in overseeing the company's extensive network of gas stations, maintaining brand integrity and customer service standards. Nibuya's leadership ensures operational excellence and contributes to Idemitsu Kosan's status as Japan's second-largest petroleum refiner. This executive drives efficiency and innovation across all operational domains, reinforcing the company's commitment to delivering high-quality energy solutions.
    Susumu Nibuya

    Takashi Hadani - President & Director

    Takashi Hadani, the President & Director at Idemitsu Kosan, holds ultimate responsibility for the company's strategic vision and overall direction. Hadani guides Idemitsu Kosan's operations as Japan's second-largest petroleum refiner, overseeing the production and sale of petroleum, oils, and petrochemical products. This leadership position involves setting the corporate agenda and ensuring that all business units, including refineries and gas stations, operate in synergy. Takashi Hadani's role as President & Director is critical in shaping the company's market strategy and fostering innovation within the energy sector. The President & Director drives initiatives that enhance Idemitsu Kosan's competitive edge and long-term sustainability. Hadani's executive decisions impact the company's performance across all operational facets, from upstream exploration to downstream retail, reinforcing its significant presence in the Japanese market.

    Toru Wada - President

    Toru Wada, the President at Idemitsu Kosan, leads the company's executive team and charts its strategic course. Wada's presidency involves overseeing the comprehensive operations of Idemitsu Kosan, a major player in Japan's petroleum industry, encompassing oil platforms, refineries, and extensive petrochemical production. This executive role is pivotal in guiding the company's market strategy and ensuring operational efficiency across its diverse business segments, including its network of gas stations. Toru Wada's leadership focuses on driving growth and maintaining Idemitsu Kosan's competitive position in the dynamic energy market. The President directs efforts to innovate and adapt to industry changes, ensuring the company's continued success and commitment to delivering essential energy products. Wada's influence extends across all levels of the organization, reinforcing Idemitsu Kosan's commitment to excellence.

    Frequently Asked Questions Regarding Idemitsu Kosan Top Executives and Leadership Team

    Who leads Idemitsu Kosan?
    Idemitsu Kosan is led by Noriaki Sakai (Chief Financial Officer, Accounting Department & Finance Department & Senior Executive Officer), along with executives such as Brian Coulson (Senior Vice President and Chief Operating Officer) and Susumu Nibuya (Representative Director, Executive Vice President & Chief Operating Officer).
    Who is part of Idemitsu Kosan’s executive team?
    The executive team of Idemitsu Kosan includes leaders such as Noriaki Sakai (Chief Financial Officer, Accounting Department & Finance Department & Senior Executive Officer), Brian Coulson (Senior Vice President and Chief Operating Officer), Susumu Nibuya (Representative Director, Executive Vice President & Chief Operating Officer) and other senior executives.
    How many executives does Idemitsu Kosan have?
    Idemitsu Kosan has 5 executives leading key business areas.
    What roles are included in Idemitsu Kosan’s leadership team?
    The leadership team of Idemitsu Kosan includes roles such as Chief Financial Officer, Accounting Department & Finance Department & Senior Executive Officer, Senior Vice President and Chief Operating Officer, Representative Director, Executive Vice President & Chief Operating Officer, President & Director, President.