Board of Directors

Burak Orhun embarked on his professional journey as a Financial Analyst at Mercedes-Benz Türk A.Ş. He later continued his career in the United States, where he held various executive and management roles at leading organizations, such as Finance Manager at Thomson Corporation/Reuters, Director of Portfolio Management and Director of Corporate Development at Capital One Financial, and CFO at CadenceQuest, Inc.

In 2009, Orhun joined Oyak Group in Türkiye. As General Manager of Oyak Girişim Danışmanlığı A.Ş, he led all M&A and new investment initiatives until 2018. During this period, he also held Executive Board Member, and Chairperson positions at group’s chemical and energy companies in Türkiye and abroad.

Orhun joined Sabancı Group in 2019 as Head of Strategy and Business Development. He served as Head of the Building Materials Group at Sabancı Holding from May 2021 to April 2024 and then assumed the role of Head of the Material Technologies Group in April 2024. During this period, he also served as Chairperson of the Board at Kordsa, Brisa, Akçansa, Çimsa, Çimsa Building Solutions BV, and Afyon Çimento.

With Sabancı Holding’s new organizational structure, Burak Orhun was appointed Head of Strategic Investments in January 2026. In addition to this role, he continues to serve as Chairperson of the Board at Kordsa and Brisa, and as a Board Member at Akçansa, Çimsa and Afyon Çimento.

Burak Orhun holds a Bachelor’s degree in Economics from Boğaziçi University, a Master’s degree in Finance from George Washington University, and an MBA from the Wharton Business School, University of Pennsylvania.

Tomio Fukuzumi graduated from Osaka City University, Department of Economics. He joined Bridgestone in April 1988. In his career, he worked in mainly international tire business and worked as Tire Sales Director and Managing Director in Korea, United States Chicago, Belgium Brussels, India and Thailand. Fukuzumi was assigned as Director of Tire International Business at Bridgestone (BSJ) Head Office in 2016 and also served as a Member of the Board of Directors in Bridgestone Americas (BSAM), Bridgestone Europe, Middle East, India and Africa (BSEMIA) and Bridgestone Asia Pacific (BSCAP). Fukuzumi has been working at Brisa since December 21, 2022.

Mustafa Bayraktar graduated from the Finance Department of Alabama University and received his master’s degree in the same field from Boston College. Since 2002, he has been serving as the Chairperson of the Board of Directors of Hüseyin Bayraktar Yatırım Holding A.Ş.

Bayraktar has been serving as the Chairperson of the Board at Baytur Motorlu Vasıtalar Tic. A.Ş., Ege Fren Sanayi ve Ticaret A.Ş., Ege Endüstri ve Ticaret A.Ş. and EAT Ege Araç Teknolojileri A.Ş.

Umut Zenar has been appointed as the Strategic Investments and Operations President at Sabancı Holding, effective January 1, 2026.

He holds a bachelor's degree in International Relations from Boğaziçi University. He subsequently completed the Executive MBA programme at Boğaziçi University.

Joining the Sabancı Group in 2004, Zenar held senior positions in Strategy, Business Development and Marketing at Akçansa until December 2016, serving as Deputy General Manager of Sales and Marketing and CEO of Akçansa. Between December 2016 and June 2018, he served as the General Coordinator at Oyak Cement, Concrete and Paper Group. Umut Zenar was appointed CEO of Akçansa in July 2018 and held this position until 2020, alongside his role as the Chairman of the Board of Directors at Karçimsa A.Ş.

Zenar began his role as CEO of Çimsa in 2020 and held this position until December 2025. He led Çimsa's Global Growth and Transformation process.

Umut Zenar is a Member of the Board of Directors of the Global Cement and Concrete Association (GCCA) and the Association of Turkish Construction Material Producers (İMSAD), as well as a member of the Supervisory Board of the Cement Industry Employers' Union (ÇEİS).

Jacques began his career in Finance with Price Waterhouse Coopers, after completing his studies at the University of Pretoria. He joined Cummins in 2004 as the Finance Director for Southern Africa before transitioning to Finance Director for the Africa organization in 2006. In 2008, Jacques was assigned as Managing Director for Cummins Ghana and became responsible for establishing the Cummins-owned distributor after acquiring the long-term, independent distributor in the region. In 2011, he was assigned as the Managing Director for Cummins Southern Africa, a distributor region covering 11 countries with direct and indirect distribution channels. In 2014, Jacques took on a commercial role as Director of Sales and Marketing for the Africa business before being promoted to the global distribution organization as Executive Vice President of Operations and relocating to the United States in 2015. In 2017, Jacques was further promoted to President of Cummins Rocky Mountain in North America.

Jacques returned to South Africa in 2019 to take on the Bridgestone South Africa Group CEO role. At Bridgestone, his task was rebuilding the business strategy, channels, and access to market and fully transform the sales and marketing organization. In 2022, Jacques was promoted to President of Africa, Middle East and CIS markets, a position he continues to hold today, and joined the EMEA Management Board.

Jacques holds a Bachelor’s Degree in Finance & Accounting (Honors) from the University of Pretoria (South Africa).

Jérôme Boulet serves as Vice-President Logistics and Supply Chain Management of Bridgestone Europe Middle East and Africa (BSEMEA), a position he has held since February 2021. He also serves as Board Member of Bridgestone Middle East and Africa, headquartered in Dubai. Since April 2025, he also has acted as a member of the Bridgestone EMEA Board. Effective as of March 1, 2026, he continues to serve as Vice President of Logistics and Supply Chain Management, as well as Vice President of Business Services, for Bridgestone Europe, Middle East and Africa.

In his role, Boulet maintains executive leadership over the end-to-end supply chain from procuring raw material, planning, manufacturing, to warehousing and distributing Bridgestone tires across EMEA geographies. As member of the Global Supply Chain Management Committee of Bridgestone Corporation, he is also the architect of the next-gen supply chain, which will maximize value creation by closely connecting customers and the value chain, this to result in a “resilient excellent Bridgestone.”

Since he joined Bridgestone in 2001, Jérôme Boulet took diverse leadership positions that spanned product management, digital venture, merger and acquisition, supply chain management, manufacturing strategy and procurement. In recent years, Boulet has spearheaded the mobility solutions strategy for Bridgestone EMEA and led the acquisition of TomTom Telematics in 2019 (known today as Webfleet Solutions).

In 2020, Boulet joined the COO office and led multiple large-scale transformations in the field of logistics optimization, manufacturing footprint restructuring and procurement outsourcing.

Boulet also worked for several years at Accenture, where he was centred on working with Boards of Fortune 500 companies on largescale supply chain transformation in pharmaceutical, automotive, steel and chemical sectors.

Jérôme Boulet earned his bachelor’s degree in business and economics from ESCIP School of International Business, France.

Arianna Antonella began her career in 2005 as a Corporate Finance and Capital Markets Trainee at Norton Rose Fulbright. In 2007, she moved to Baker & McKenzie’s Milan office as an Associate in the Corporate and M&A Department. From 2010 to 2016, she held the role of Head of Legal for Group Corporate Affairs and M&A at Italcementi S.p.A., a leading Italian company in the building materials industry (now part of the Heidelberg Materials Group). In 2017, Arianna joined Bridgestone EMEA as Head of Legal and Compliance for the European South Region. She was promoted in 2019 to Legal and Compliance Director for Europe. Since July 2025, Arianna has held the position of Executive Director, expanding her remit to the EMEA Region.

Vecih Yılmaz graduated from Middle East Technical University, Department of Business Administration, in 2005, simultaneously completing a minor program in Political Science and Public Administration at the same university. In 2012, he completed his master’s degree in Financial Economics at Galatasaray University.

Having started his professional career as an auditor at Deloitte in 2005, Vecih Yılmaz joined Sabancı Group in 2009. He worked as a Financial Planning, Analysis, and Investor Relations Manager at Sabancı Holding between 2009 and 2013 and as a Financial Control and Risk Manager at Enerjisa Enerji between 2013 and 2015. Between 2015-2017, he worked as CFO at Assan Panel and as the Financial Affairs Director at Kibar Holding, respectively. In 2017, he re-joined Sabancı Group. Yılmaz occupied the role of Finance Director at Sabancı Holding between June 2017 and April 2019 and also served as a Board Member at Kordsa and Yünsa. Yılmaz served as Assistant General Manager of Finance and Accounting at Çimsa from April 2019 until December 2022 and as General Manager at Akçansa from December 2022 until January 2026. As of January 1, 2026, he has occupied the position of Brisa General Manager.

Şebnem Önder started her career at White & Case LLP in Türkiye as an Associate in 1994. She then took her expertise to New York between 1999 and 2000, working in the same capacity at the Company’s headquarters. Her tenure at White & Case LLP saw significant progression when she returned to Türkiye to serve as a Partner until 2014.

In 2014, Önder transitioned to British American Tobacco (Türkiye & North Africa), where she took on the role of Legal Director. Her responsibilities expanded as she assumed the position of European Regional Head of Compliance between 2018 and 2022, overseeing compliance activities across the region.

Since September 2022, Şebnem Önder has been serving as the Legal and Compliance President at Sabancı Holding. In addition to her executive role, she holds board memberships at several Sabancı Group companies, including Brisa, Carrefoursa, Temsa Skoda Sabancı Ulaşım Araçları, and Sabancı Building Solutions B.V., contributing her legal and compliance expertise to the governance of these entities.

Şebnem Önder completed her law education at Ankara University Faculty of Law in 1994.

Ahmet Erdem graduated from İstanbul Technical University as a Civil Engineer and completed his degree in Engineering Management at İstanbul University Graduate School of Business Administration.

Erdem, who started working at Shell in 1990, worked at executive levels in Türkiye, the Middle East and Europe. After serving as Greece and Türkiye Investment Manager and Türkiye Mobility General Manager, he led the integration of Shell & Turcas mobility businesses in 2006 and is currently the Chairperson of the Board of Directors. After serving as Mobility General Manager and Executive Committee Member during the integration of the joint venture, he served as Country Chair Shell Kenya and Chairperson of Shell Kenya, the centre of Shell’s activities in East Africa. Ahmet Erdem received training on financial and reputation risk management at Royal Dutch Shell and has nearly 20 years of risk management experience across the country.

Erdem currently serves as Country Chair of Shell Türkiye as well as Chairperson of Shell & Turcas A.Ş.

Ahmet Erdem currently serves as the Chairperson of the Petroleum and Petroleum Products Industry Council of the Union of Chambers and Commodity Exchanges of Türkiye (TOBB), Chairperson of the Board of Directors at the Energy Efficiency Association (ENVER), Board Member at the Turkish Oil Industry Association (PETDER) and United Nations Global Compact Türkiye, and the Advisory Board Member of the British Chamber of Commerce.

She was born in İstanbul in 1963. After graduating from the Sankt Georg Austrian High School, she graduated from Boğaziçi University, Department of Business Administration. She completed the joint MBA Program at Manchester Business School & University of Bangor and attended various executive programs at Harvard and Insead.

She started her career at Interbank in 1988. She worked as a Director at Bankers Trust A.Ş. between 1990 and 1999, as General Manager and Deputy General Manager at Deutsche Bank A.Ş. between 1999 and 2007, and as General Manager and Head of Client Coverage at Credit Agricole Yatırım Bankası Türk A.Ş. between 2007 and 2012. She served as General Manager and Head of Corporate and Institutional Clients at Standard Chartered Yatırım Bankası Türk A.Ş. between 2012 and 2016. Yardım, who provided consultancy to the UK-based Experian company on its Türkiye growth strategy between 2017 and 2018, has been serving as the İstanbul Branch Manager of the Commerz Real AG Real Estate Investment Fund based in Germany since 2019.

Yardım served as an Independent Board Member at Pınar Entegre Et ve Un Sanayii A.Ş. and Altın Yunus Çeşme Turistik Tesisler A.Ş. between 2021-2023. She served as an Independent Board Member at Çimsa Çimento Sanayi ve Ticaret A.Ş. and Enerjisa Enerji A.Ş. between 2018-2024, serving for a six-year term. Since 2024, Yardım has been serving as an Independent Board Member and assuming various committee chairpersonships at Brisa Bridgestone Sabancı Lastik Sanayi ve Ticaret A.Ş., Aksigorta A.Ş. and Agesa Hayat Emeklilik A.Ş.

She played roles in non-governmental organizations such as YASED, TÜSİAD, DEİK throughout her business life. She speaks English and German.