Cboe Europe Management

The Cboe Europe management team focuses solely on the Company's mission of Making Markets Better. From superior trading technology with consistently reliable performance, to innovative price and billing systems, to providing free real-time web-based market data, the management team seizes every opportunity to make the European markets a better place to do business.

Mark Hemsley
Chief Executive Officer
Based in London

Mark Hemsley is chief executive officer of Cboe Europe, the largest pan-European equities exchange and the European arm of Cboe Global Markets. Under his leadership, Cboe Europe became a Recognised Investment Exchange (RIE) in May 2013, strengthening the company’s European leadership position in market structure, technology and innovation.

Cboe Global Markets acquired Chi-X Europe in November 2011 and appointed Mr. Hemsley as CEO of the combined Cboe Europe organisation. In the span of five months, he and his team launched the first full interoperable clearing service offered by a trading venue and successfully integrated the Cboe Europe and Chi-X Europe MTFs, capped by the seamless move of Chi-X Europe’s trading books to Cboe’ technology platform.

During his tenure at Cboe, Mr. Hemsley and his team have received numerous awards, including the Financial News Trading & Technology Awards Honour for Best Stock Exchange or MTF. Mr. Hemsley has been named to the “FN 100 Most Influential” list, which recognizes key financial executives impacting European financial markets, every year since 2009. He also contributes his market structure expertise as a member of the European Securities and Markets Authority (ESMA) Secondary Markets Standing Committee providing consultation on the impact of market structure changes and ESMA policy development.

Before joining Cboe, Mr. Hemsley was managing director and chief information officer at LIFFE, running its Market Solutions group. At LIFFE from 2001-2004, he won major contracts with top exchanges and transformed the technology organization to capture greater revenue from its exchange businesses. A LIFFE board member, he was also heavily involved in the sale of LIFFE to Euronext, the predecessor company to NYSE Euronext.

Previously, Mr. Hemsley was a managing director of global technology - serving as chief operating officer and a CIO - during his tenure at Deutsche Bank GCI, the investment bank. With that company, he managed teams of professionals in Frankfurt, London, New York, Singapore, Sydney and Tokyo, while working closely with the firm's trading operations.

His previous positions included time as a vice president at Credit Suisse First Boston, where he was global head of foreign exchange technology, and a stint as CIO at Natwest Capital Markets.

David Howson
Chief Operating Officer
Based in London

David Howson joined Cboe Europe as chief operating officer in June 2013. He brings nearly 20 years of experience in European and North American financial markets technology to the company, overseeing Cboe Europe’s software engineering, infrastructure and operational teams.

Most recently, Mr. Howson was chief technology officer at Equiduct Systems Ltd., where he was one of the founders responsible for establishing Equiduct in 2006 as a pan-European Regulated Market. Mr. Howson spearheaded the design and implementation of the company’s technology platform and market structure and was responsible for technology strategy, market structure and post-trade services.

Prior to Equiduct, Mr. Howson was solutions architect and principal consultant at Reuters Consulting. His work included implementing and integrating a pan-European equities trading platform for Nasdaq Europe, as well as the architecture and implementation of the Super Montage Hybrid trading system for Nasdaq Deutschland. Later, as principal consultant to the Nasdaq Stock Market based in the U.S. he managed the redesign and deployment of several Nasdaq Market Site systems.

He graduated with first-class honours in Mathematics and Computer Science from Newcastle University.

Jerry Avenell
Co-Head of Sales

Jerry Avenell was appointed co-head of the Cboe Europe sales division following Cboe' acquisition of Chi-X Europe and directs client relationship management and development in the UK and Ireland.

Mr. Avenell joined Chi-X Europe in November 2007 and was business development manager for the UK and Ireland. He was responsible for a range of Chi-X Europe's key market participant relationships and was involved in new product development initiatives.

"Jerry brings an extensive background in financial markets to the Cboe Europe team and has demonstrated success in building and enhancing customer relationships,"" said Mark Hemsley, chief executive officer of Cboe Europe. “I look forward to his contributions to our strategic objectives and growth."

Prior to joining Chi-X Europe, Mr. Avenell spent over eight years at the London Stock Exchange where he was responsible for market data division's account management. He was subsequently responsible for business development in the market services team and tasked with building the LSE's buy-side strategy.

Mr. Avenell started his career in software sales for the Press Association in 1994 and is a BA (Hons) graduate of the University of Manchester.

Alex Dalley
Co-Head of Sales

Alex Dalley co-heads the Cboe Europe sales division and is responsible for client relationship management and development in continental Europe. As one of the first employees to join Cboe Europe in 2008, Mr. Dalley was responsible for building the MTF's trading participant community as head of sales.

Mr. Dalley was previously with the London Stock Exchange where he served as head of membership and exchange trading directing Exchange trading sales, client management and member firm acquisition. He also led business development for the LSE buy-side/sell-side FIX hub and spoke service.

"With his experience at the LSE servicing and consulting with clients on all market issues, Alex is a valuable resource for current and future participants of the Cboe Europe trading community," said Mark Hemsley, chief executive officer of Cboe Europe.

He is a former Surrey County golfer and graduated with a BA (Hons) in Business Studies from the University of Plymouth.

Adam Eades
Chief Legal and Regulatory Officer

Adam Eades leads Cboe Europe's legal, compliance, market supervision and risk departments, having joined Cboe Europe as head of regulatory and legal affairs in November 2011. Mr. Eades is a member of the Board of Cboe Trading Limited and brings with him 20 years of legal, regulatory and compliance experience in financial markets and exchange trading and clearing.

"Adam brings depth of legal and regulatory expertise and a strong background in exchange trading, clearing and corporate governance to the management team. Since joining Cboe Europe, Adam's work has resulted in raising our profile with regulators and policymakers and is a tremendous asset as we consider the transformation of our business," said Mark Hemsley, CEO of Cboe Europe.

Immediately prior to joining Cboe Europe, Mr. Eades was global general counsel at publicly traded Henderson Group plc, the international investment management firm, where he led legal, compliance and corporate secretariat functions in Europe, North America, Southeast Asia and Australia.

Mr. Eades’ experience includes 14 years at LIFFE and Euronext (later NYSE Euronext), where he held numerous leadership positions, including leading the European legal division for NYSE Euronext and serving as global head of legal affairs for NYSE Liffe responsible for all legal matters related to derivatives.

Prior to the acquisition of LIFFE by NYSE Euronext, Mr. Eades was general counsel and company secretary for LIFFE and served on its executive committee. He was appointed chairman of LIFFE Trustees Ltd., the corporate trustee of the LIFFE pension scheme, and board director of Euronext UK plc. He also directed market supervision and investigations during his tenure at LIFFE.

Mr Eades is a qualified Solicitor and a member of the Law Society. He graduated from Newcastle upon Tyne University with an honours degree in Politics and History and subsequently completed his legal qualification at Guildford College of Law. Based in London, his interests include guitar, cycling and rugby.

Jill Griebenow
Chief Financial Officer
Based in London

Jill Griebenow became chief financial officer of Cboe Europe in February 2014. Ms. Griebenow is responsible for all financial control and human resource functions at Cboe Europe, including financial planning and reporting.

Ms. Griebenow joined Cboe Global Markets as a Financial Reporting Specialist in 2011. Most recently, she served as Assistant Controller at Cboe Global Markets where she managed the daily operations of the company’s U.S. accounting function.

Prior to joining Cboe Global Markets, Ms. Griebenow was a Senior Manager at EY (formerly Ernst & Young) in Kansas City, Missouri, where she focused on audits of public companies within the asset management and financial services sectors. Ms. Griebenow has more than a decade of experience in the financial and public accounting industries.

Mark Hemsley, CEO of Cboe Europe said: "I am confident that Jill’s vision and expertise will drive our operational excellence to even greater heights as our business in Europe continues to grow."

She is a Certified Public Accountant and a member of the American Institute of Certified Public Accountants (AICPA), graduating from the University of Northern Iowa cum laude in 2001.

Guy Simpkin
Head of Business Development

Guy Simpkin was appointed Cboe Europe's Head of Business Development in April 2012 and is responsible for developing new products and services that leverage Cboe Europe's pan-European cash equity success.

Guy brings 30 years of industry experience to Cboe Europe. He started his City career as an index fund manager with Barclays Investment Management (now Blackrock) where he was one of the original team that introduced quantitative fund management to Europe. He joined LIFFE (now ICE) as head of business and market development in 1994 before leaving to run equity and equity derivatives clearing at LCH.Clearnet. Guy held a similar role at Chi-x Europe when acquired by Cboe

Mr. Simpkin graduated with honours from Imperial College of Science and Technology with a degree in Mathematics. He lives in Surrey with his family and is a keen cricketer and single figure golfer.