CORPORATE GOVERNANCE.

Ali Ahmet KOCABIYIK Chairman

Ali Ahmet Kocabıyık completed his undergraduate studies in Economics and Mechanical Engineering at the University of Birmingham in the United Kingdom, after graduating from İstanbul High School. He then earned a Master’s degree in Mechanical Engineering from Carnegie Mellon University in Pittsburgh, USA. In 1990, he completed the Owner/President Management (OPM) program at Harvard Business School.

Mr. Kocabıyık began his professional career in 1980 as a pattern engineer at Blaw-Knox Foundry in Pittsburgh, USA. Since 1983, he has held various senior leadership positions within the Borusan Group. He currently serves as the Chairman of the Board of both Borusan Group and Borusan Pipe.

Ahmet Kocabıyık has been honored with the “Decoration of Science and Arts” by the Austrian Government and the “Gold Medal in the Arts” by the Kennedy Center Foundation in the U.S.A. In 2013, he was awarded an Honorary Doctorate by Istanbul Technical University for his contributions to education, culture, and the arts. He is a member of the Board of Directors of the Borusan Kocabıyık Foundation and a founding member of the Efes Foundation.

Semih ÖZMEN Vice Chairman

Semih Özmen completed his undergraduate and doctoral studies in Mechanical Engineering at the University of Birmingham before beginning his professional career in 1983 at Isuzu Motors. From 1986 to 1987, he worked in Japan, where Isuzu’s headquarters is located, to specialize in steel part design and manufacturing.

In 1988, Mr. Özmen started working at Borusan Pipe as the Director responsible for New Product Design. Between 1992 and 2016, he held several senior positions, including Vice President of Purchasing and Supply Chain, Executive Vice President of the Automotive Pipe Segment, and CEO of Borusan Pipe.

From 2017 to 2023, Mr. Özmen served as the Chairman of the Board of Borusan Pipe. Since 2023, he has continued his leadership roles as the Chairman of the Board of Borusan Berg Pipe and as a Board Member of Borusan Pipe.

Additionally, Semih Özmen holds key positions within the Borusan Group, including Chairman of the Board of Borusan EnBW Enerji, Board Member of Borçelik, and Board Member of Borusan Holding.

Erkan Muharrem KAFADAR Independent Board Member

Erkan Kafadar completed his secondary and high school education at İstanbul High School and graduated from the Faculty of Business Administration at İstanbul University.

Mr. Kafadar joined Borusan Group in 1991 as a trainee at Borusan Pipe. Throughout his 34-year career, he has held various roles in Sales, Marketing, Customer Technical Services, and Purchasing at Borusan Pipe and Borçelik. During this time, he also served as the General Manager of Borçelik for 9 years.

Between 2015 and 2019, Erkan Kafadar was a member of the Executive and Steering Committees of Borusan Holding. On January 1, 2020, he was appointed as the Group CEO of Borusan Holding. In addition to this role, Mr. Kafadar serves as Chairman of the Board, Vice Chairman of the Board, and Board Member in all operational companies of Borusan Group and is a Board Member at Borusan Pipe.

Erkan Kafadar is also a Board Member of the Turkish Metal Industrialists’ Union (MESS), a member of the Turkish Industrialists and Business People’s Association (TÜSİAD), a Disciplinary Board Member of the Turkish Confederation of Employer Associations (TİSK), a Board Member of the Sabancı University Istanbul International Center for Energy and Climate Research (IICEC), and a Member of the 43rd Professional Committee of the Istanbul Chamber of Industry (ISO).

Defne Kocabıyık NARTER Board Member

Defne Kocabıyık Narter completed her double major in Economics and Psychology at New York University in 2014. After gaining experience at various start-up companies, she joined Borusan Group in 2015 as a Business Development and Marketing Analyst at Borusan Pipe U.S. in Houston, USA. Between 2015 and 2019, she worked as the Sales Manager in the export department of Borusan Pipe.

Mrs. Narter is currently a Board Member at Borusan Pipe, Borusan Makina ve Güç Sistemleri (Caterpillar), and Borusan Otomotiv Group. She also serves as a member of the Audit Department and the Ethics Committee at Borusan Holding, and as the Chair of the Investment Committee at Borusan Corporate Venture Capital (CVC).

İbrahim ROMANO Independent Board Member

İbrahim Romano graduated from the Department of Economics at Boğaziçi University in 1992 and earned his Master’s degree in International Relations from Istanbul University in 1993. He began his professional career in 1994 as an Assistant Manager at Yatırım Bank, and between 1996 and 2002, he worked as a Manager at Dundas Ünlü, a company he co‑founded. Following Standard Bank’s partnership with Dundas Ünlü, he became the Head of the Corporate Finance Department at Standard Ünlü, which has operated as ÜNLÜ & Co since 2012.

Mr. Romano currently serves as the Managing Director of the Corporate Finance Department and as an Executive Board Member overseeing Investment Banking Advisory at ÜNLÜ & Co. He also continues his roles as a Board Member of ÜNLÜ & Co and as an Independent Board Member of Borusan Pipe.

Bülent BOZDOĞAN Independent Board Member

Bülent Bozdoğan graduated from the Department of Business Administration at Middle East Technical University (ODTÜ) in 1980 and began his career as an independent auditor at PwC. Between 1982 and 1991, he held various managerial positions in the finance and commercial departments at Unilever Türkiye. In 1991, he joined Brisa, a company within the Sabancı Group, where he served as the Deputy General Manager responsible for Finance, Planning, and Control Functions.

From 2001 to 2009, Mr. Bozdoğan worked as the Deputy General Manager for Finance (CFO) at DUSA International LLC, a Sabancı-Du Pont joint venture, and later at Kordsa Global A.Ş. following the company’s acquisition by Sabancı Holding. From 2009 to 2017, he served as the Head of the Audit Department at Sabancı Holding. After a 26-year career at Sabancı Holding, he retired. Between 2018 and 2019, he served as the Chairman of the Executive Board at Dedeman Holding, which operates in the mining and tourism sectors.

Bülent Bozdoğan currently serves as an Independent Board Member at Carrefoursa, Akçansa, Kordsa Indonesia, and Borusan Pipe.

Tayfun BAYAZIT Independent Board Member

Tayfun Bayazıt, after completing his undergraduate studies in Mechanical Engineering, earned his MBA in Finance and International Relations from Columbia University in 1983. He began his banking career at Citibank and held senior management positions at Çukurova Group, including Deputy General Manager at Yapı Kredi, General Manager at İnterbank, and CEO at Banque de Commerce et de Placement S.A. in Switzerland, over a span of 13 years.

In 1999, Mr. Bayazıt was appointed Vice Chairman of the Board of Doğan Holding and Executive Director of Dışbank. In 2001, he became the CEO of Dışbank. He was elected Chairman of the Board in 2003, and following Fortis’ acquisition of a majority stake in Dışbank in July 2005, he was appointed CEO of Fortis Türkiye and a Member of the Fortis Global Management Committee. In 2006, he assumed the role of Chairman of the Board at Fortis Türkiye.

In 2007, Mr. Bayazıt returned to Yapı Kredi (a joint venture between UniCredit and Koç) as Executive Director and General Manager, and in 2009, he became Chairman of the Board. In August 2011, he left his position at Yapı Kredi to establish his own management and consulting firm.

Tayfun Bayazıt currently serves as the Chairman of the Board at Polisan Holding, Marsh McLennan Group Türkiye, and Aura Portföy. He also holds independent board membership roles at Borusan Pipe and various other publicly listed companies. Mr. Bayazıt is a Member of the High Advisory Council of TÜSİAD and is actively involved in several civil society organizations, including the Global Relations Forum, Education Volunteers Foundation of Türkiye (TEGV), Darüşşafaka, and the World Resources Institute.

Zafer ATABEY Chairman of the Executive Committee
Global CEO

Zafer Atabey graduated from the Faculty of Economics and Administrative Sciences at Boğaziçi University. He began his career at Borusan Pipe in 1991, where he held various roles in the Marketing and Sales departments for 10 years. In 2001, he became the Trade Manager at the Vobarno factory in Italy, and in 2005, he was appointed General Manager of the same facility.

Returning to Türkiye in 2008, Zafer Atabey served as Deputy General Manager in various segments at Borusan Pipe. In 2013, he was appointed as a Board Member at Borusan Pipe U.S. Inc., and in 2015, he became Vice Chairman of the Executive Committee at Borusan Pipe. Since January 2017, Mr. Atabey has served as the Chief Executive Officer at Borusan Pipe.

Anıl KARACA Executive Committee Member
Global CFO

Anıl Karaca graduated from the Department of Business Informatics at Marmara University and completed the AMP program at Harvard Business School. He began his career in 2001 as an auditor at PwC. From 2004 to 2011, Mr. Karaca managed the financial reporting and controlling functions at Anadolu Efes.

Between 2012 and 2014, Mr. Karaca served as CFO at Efes Kazakhstan, and from 2014 to 2016, he worked as CFO at Çelik Motor, where he also led the leasing function. From 2016 to 2017, he served as Board Member and CFO at Şişecam Flat Glass Group, and from 2017 to 2021, he was the General Manager of Şişecam Automotive.

Anıl Karaca has been a Member of the Executive Committee at Borusan Pipe since October 2021, overseeing financial affairs, strategy, legal, and foreign trade functions. He also serves as a Board Member at Borusan Pipe U.S., Borusan Berg Pipe, and Borusan Vobarno.

Uğur ONBAŞI Executive Committee Member
Borusan Berg Pipe President

Uğur Onbaşı graduated from the Department of International Relations (in English) at the Faculty of Economics and Administrative Sciences, Marmara University.

Between 1999 and 2004, Mr. Onbaşı worked in the Export Department of Borusan Pipe. From 2004 to 2006, he served as Project Manager for Six Sigma Black Belt Projects. In 2007, he was appointed Raw Material Purchasing Manager, and in 2013, he became the Trade Director for the Infrastructure Project Segment at Borusan Pipe.

From 2015 to 2023, Uğur Onbaşı served as Executive Vice President of the Türkiye Infrastructure Project Segment. He currently serves as a Member of the Executive Committee responsible for the U.S. Large-Diameter Pipe Segment at Borusan Pipe and is the Chairman of the Executive Committee at Borusan Berg Pipe, based in the United States.

Ali OKYAY Executive Committee Member
Automotive Segment

Ali Okyay graduated from the Department of Industrial Engineering at Boğaziçi University and began his career in 2000 at Borusan Pipe as a Domestic Sales Specialist.

Between 2003 and 2006, he managed Six Sigma Black Belt Projects at Borusan Group. In 2006, he was appointed Export Manager, and in 2013, he became the Automotive Segment Manager. In 2014, he was promoted to Sales Director of the Automotive Segment.

In 2017, Mr. Okyay was appointed Deputy General Manager responsible for Purchasing and Supply Chain processes. From 2019 to 2023, he served as Executive Vice President of the Automotive Segment at Borusan Pipe. Since 2023, he has continued as a Member of the Executive Committee responsible for the Automotive Segment at Borusan Pipe.

Oğuzhan KUŞCUOĞLU Executive Committee Member
Borusan Pipe US President

Oğuzhan Kuşcuoğlu graduated from the Department of Economics at Boğaziçi University and began his career in 2001 at Maersk Line in a Business Development role.

In 2004, he joined Borusan Pipe as a supervisor in the Export Sales function and was later promoted to Manager in 2011.

In 2015, Mr. Kuşcuoğlu became Export Sales Director, and from 2017 to 2023, he served as Executive Vice President of the Construction and General Industry Segment. During this period, he managed both Export and Domestic Market Sales. In 2019, he took on responsibility for Purchasing and Procurement, and from 2021 onward, he also oversaw the Production Departments at the Gemlik ERW Factories.

As part of his segment responsibilities, Mr. Kuşcuoğlu was also in charge of the production and sales of the SRM production Facility, which began operations in the USA in 2024. Since 2023, he has continued as a Member of the Executive Committee responsible for the Construction and General Industry Segment at Borusan Pipe.

Since 2026, he continues his role at Borusan Pipe as a President of Borusan Pipe US Inc.

Nihan ALHAN Executive Committee Member
Global Chief People and Sustainability Officer (CPSO)

Nihan Alhan holds a degree in English Linguistics from Hacettepe University and an MBA from Bahçeşehir University.

Beginning her professional career in 2003, Alhan has assumed senior leadership roles in the automotive sector, specializing in human resources, occupational health and safety, industrial relations, compensation, and benefits. She has served in various leadership positions within global companies, taking on significant responsibilities across the European region.

Since 2021, Alhan has served as Executive Committee Member responsible for People and Sustainability at Borusan Pipe, where she leads the company’s people-driven transformation and sustainability strategies.

Serdar ERÇAL Executive Committee Member
Borusan Pipe Türkiye President

Serdar Erçal graduated from the Department of Mechanical Engineering at Istanbul Technical University.

He began his career in 2003 as a Project Sales Manager at Borusan Logistics and has held various managerial positions since then. He served as Deputy General Manager of Supply Chain Management and Strategic Customers at Borusan Logistics, and subsequently as General Manager of Borusan Ports. In 2021, he was appointed General Manager of Borusan Logistics and held this position until 2025.

Since December 1, 2025, he has been appointed President of Borusan Pipe Türkiye and a Member of the Executive Committee of Borusan Pipe.

Serdar BİRTLİKCİ Executive Committee Member
Global Chief Digital Technologies and Innovation Officer (CDIO)

Serdar Birlikci graduated from the Department of Electronic Engineering at Hacettepe University in 1995 and earned an MBA from Sabancı University in 2002. He began his career in 1995 as part of Microsoft’s Technical Support team. From 1996 to 2002, he held various roles at Ericsson, overseeing different areas of IT, including technology and operations, project management, quality, and compliance. He also served as the IT Director responsible for Türkiye, Azerbaijan, and Israel.

Between 2003 and 2019, Mr. Birlikci held various roles at PepsiCo, progressing from Business Solutions Manager to CIO, where he led the Global Agile Transformation program during this period. From 2019 to 2022, he served as CIO at Groupama Sigorta before joining Borusan Pipe in April 2022.

Serdar Birlikci currently serves as a Member of the Executive Committee responsible for Global IT and Digital Transformation processes at Borusan Pipe.

Josh CROIX Executive Committee Member
U.S. OCTG Segment

Josh Croix holds a Bachelor’s degree in Mechanical Engineering from Texas A&M University and completed a certificate program in Advanced Management at Rice University. He began his career in 1997 as a Project Engineer at Bredero Shaw in Scotland, advancing to senior roles in various global locations, including Nigeria, Singapore, Thailand, Indonesia, Malaysia, the United States, and Brazil, ultimately becoming General Manager. He later transitioned into a commercial role, focusing on mergers and acquisitions, expansion, and new product development.

In 2010, Mr. Croix served as Director of Business Development and Marketing at Pipestream, a Shell Technology Venture Capital Company. In 2013, he joined Borusan Pipe as Executive Vice President for large-diameter pipe sales in the North American market. He transitioned to the OCTG segment in 2015, first as Commercial Affairs Director and later as Operations Director. In 2024, Mr. Croix was appointed General Manager of Borusan Pipe U.S. Inc. and a Member of the Executive Committee responsible for the Borusan Pipe USA OCTG Segment.

Dimitris DIMOPOULOS Executive Committee Member
Chief Technical and Quality Officer for US Operations

Dimitris Dimopoulos holds a degree in Metallurgical Engineering from Athens National Technical University and a diploma in Management Studies from ALBA Graduate Business School in Greece.

With 30 years of experience in large-diameter steel pipe production for the energy sector, Mr. Dimopoulos joined Borusan Pipe in October 2011, focusing on quality, technology, sales, procurement, and strategy. In 2024, he was appointed a Member of the Executive Committee responsible for the technical and quality processes of Borusan Pipe’s U.S. operations.

Joel JOHNSON Chief Executive Officer Advisor

Joel Johnson holds a Bachelor’s degree in Construction Management Engineering from North Dakota State University and an MBA from Heriot-Watt University in Scotland. He began his career in 1992 as a Project Coordinator at Bredero Shaw, where, between 1992 and 2007, he served in various roles, including Project Manager, Operations Manager, General Manager of the Africa Region, Vice President of Latin American Procurement, and finally, Vice President of Business Development.

In 2008, Mr. Johnson joined Welspun Tubular, where he served as Vice President of North and South America for five years. Between 2013 and 2014, he worked as President and CEO at OMK Tube, Inc., and from 2014 to 2015, he served as a Pipe and Coating Consultant at Johnson Piper LLC.

In 2015, Joel Johnson joined Borusan Pipe U.S. as CEO. In 2024, he was appointed a Member of the Board of Directors of Borusan Berg Pipe and as the Advisor to the Chief Executive Officer of Borusan Pipe.

Özgür GÜNAYDIN Board Member

Born in Muğla in 1969, Özgür Günaydın graduated from the Mechanical Engineering Department of Middle East Technical University (METU). He received his Executive MBA degree from Sabancı University and completed the Stanford University Leadership Academy.

Günaydın joined Borusan Cat in 1995 as a service engineer, serving as the Istanbul Regional Manager and subsequently managing the company's international operations for 10 years. In this role, he was responsible for Borusan Cat operations in Kazakhstan, Azerbaijan, Georgia, and Kyrgyzstan. As of January 1, 2017, Günaydın assumed the position of CEO of Borusan Cat and continues to serve as a Founding Member of the Caterpillar Digital Council, a Member of the Caterpillar Dealer Advisory Group, and a member of the Caterpillar Mining Council, carrying out forward-looking work within the global Caterpillar ecosystem.

Günaydın is a member of the Foreign Economic Relations Board (DEİK), which contributes to the development of Turkey's foreign economic relations, and also serves on the Turkish-American Business Council (TAİK), which aims to improve trade and investment relations between Turkey and the United States. He is also a member of AmCham Turkey, a business association and non-governmental organization comprised of US companies operating in Turkey, and has spearheaded the initiation of AmCham memberships in countries where Borusan Cat operates. Günaydın also contributes to the sustainability efforts of the United Nations Global Compact Turkey.

Prioritizing projects focused on social benefit, Günaydın serves on the Board of Directors of KODA, a non-governmental organization supporting the improvement of educational conditions in disadvantaged regions of Turkey. As of April 2026, Günaydın continues to serve as Group CEO of Borusan Group and will also serve on the Board of Directors of Borusan Pipe as of May 2026.

Didem GORDON Independent Board Member

Didem Gordon is a finance professional with more than 30 years of experience in corporate banking, investment banking, and asset management, and has since 2016 continued her work as a consultant, founder, and investor in the venture capital, technology and impact investing, fintech, and sustainability ecosystem. She holds a bachelor's degree in Finance and Marketing from the Faculty of Economics and Administrative Sciences at Boğaziçi University and an MBA in Finance from San Diego State University. Gordon has further strengthened her financial expertise through the CFA Society–Harvard Business School Investment Management Program and the CFA Institute Certificate in ESG Investing. Throughout her career, she has held a range of executive and non-executive board positions in international and multicultural organizations, contributing to the establishment, management, and growth of financial services institutions in Türkiye.

Gordon began her career in 1988 at Mitsui Manufacturers Bank in the United States, and from 1992 held various positions at Interbank, Global Securities, and Strateji Menkul Değerler in Türkiye. From 1999 to 2000, she served as Director of Strategic Planning and Investor Relations at Garanti Bank, where she successfully managed the bank's secondary public offering of a 10% stake in international capital markets. She subsequently served as Chief Executive Officer and Board Member at FinansInvest. Between 2002 and 2009, she held senior management positions within Koç Financial Services / Yapı Kredi Group, including Deputy Chief Executive Officer at the Bank, Chief Executive Officer at the Group's portfolio management companies, Chairman of the investment trust, Chair of the pension fund board, and Board Member at the brokerage subsidiary. From 2012 to 2016, she served as Chairman and Chief Executive Officer of London-based Ashmore Group's Türkiye operations, and subsequently as Senior Advisor at Motive Partners. Throughout this period, she introduced innovative products, regulatory proposals, and best practices to Turkish capital markets, and served as Board Member of the Turkish Capital Markets Association, Member of the Audit Board at Borsa İstanbul, and Chairman of Capital Markets Licensing Inc.

Gordon continues her work in entrepreneurship, social entrepreneurship, and impact investing through Phaida Ventures, a consulting and investment firm she founded in Estonia in 2018, with a growing focus in recent years on AI governance and responsible AI. She completed her term as Independent Board Member and Chair of the Audit Committee at Anadolu Efes Biracılık ve Malt Sanayii A.Ş. in 2026; at BURÇELİK, she stepped down in 2025 per mandate given by leading shareholder to lead company's M&A process and successfully closed the transaction in January 2026.

Gordon currently serves as Independent Board Member and Chair of the Internal Audit Committee at Borusan Birleşik Boru Fabrikaları A.Ş. (BRSAN), and as Independent Board Member and Chair of the Corporate Governance Committee at Marmaris Altınyunus (MAALT), while maintaining board memberships at Re-Pie Portfolio Management and other companies focused on sustainable growth.