S4Capital plc is the tech-led, new age/new era digital advertising, marketing and technology services company established by Sir Martin Sorrell in May 2018.

S4 Capital Mural - London Boardroom

In 2018, S4Capital combined with MediaMonks, the leading AdAge A-listed creative digital content production company led by Victor Knaap and Wesley ter Haar, and then with MightyHive, the market-leading digital media solutions provider for future-thinking marketers and agencies led by Peter Kim and Christopher S. Martin.

Since then, MediaMonks and MightyHive have combined with more than 25 companies across content, data&digital media and technology services.

In 2021, S4Capital launched its unitary brand by merging MediaMonks and MightyHive into Monks, the next step in delivering on its foundational promise to unify its Content, Data&Digital Media and Technology Services practices.

Our mission

S4Capital is a new-age/new-era digital advertising, marketing and technology services company, operating in the fastest growing segment of the advertising and marketing services market.


We are a unified, purely digital business, which disrupts analogue models by embracing content, data&digital media and technology services.


We are dedicated to reducing global warming through our net zero by 2040 pledge and providing for Monks and their dependents.


We are  
always on.

Our practices

2023 revenue

We create stories, interfaces and experiences that create brands and help build deep emotional connections with audiences.

We provide consulting and media operations services to turn the vision of digital transformation into a reality.

We build the architecture that underpins every moment in the customer experience to deliver transformative digital experiences.

Our leadership


Sir Martin was Founder and CEO of WPP for 33 years, building it from a £1 million ‘shell’ company in 1985 into the world’s largest advertising and marketing services company. When Sir Martin left in April 2018, WPP had a market capitalisation of over £16 billion and revenues of over £15 billion.

Sir Martin supports a number of leading business schools and universities, including his alma maters, Harvard Business School and Cambridge University, and a number of charities, including his family foundation. He has been nominated as one of the TIME 100: The Most Influential People and received the Harvard Business School Alumni Achievement Award.


Prior to S4Capital, Mary was Group Finance Director at Just Eat PLC, where she led the Finance team through the class 1 merger with Takeaway.com. Her experience spans e-commerce, media, strategy and financial management of businesses undergoing rapid growth and change.

Her previous roles include CFO at UKTV and CFO for Hotels.com at Expedia Group Inc.


Elizabeth is Chief Commercial Officer of Rokt, the leading global ecommerce technology company. A proven tech and business executive with passion for transformation, Elizabeth has spent 25 years in technology, marketing and advertising.

Colin Day

Colin brings decades of experience in both management and governance roles including Non-Executive Chairman of Premier Foods plc, Chief Executive of Essentra plc and 15 years of experience as Chief Financial Officer of both Reckitt Benckiser plc and Aegis plc.

He has served as a non-executive director on the boards of major UK listed businesses including Amec Foster Wheeler, WPP, Cadbury, Imperial Brands and easyJet.

Rupert F. Walker

Rupert qualified as a Chartered Accountant with Peat Marwick Mitchell in 1972. He joined Samuel Montagu in 1977 to pursue a career in corporate finance. Over a period of 34 years Rupert advised major corporate clients on mergers, acquisitions, IPOs and capital raisings, including advising WPP on its acquisitions of JWT, Ogilvy & Mather and Cordiant, together with related funding.

He was appointed a director of Samuel Montagu in 1982 and was Head of Corporate Finance between 1993 and 1998.

He was a Managing Director of HSBC Investment Banking until his retirement in 2011.

Margaret Ma Connolly

Margaret is President and CEO of Asia, Informa Markets, overseeing its businesses in mainland China, Japan, India, Korea, Hong Kong and ASEAN, a portfolio of more than 250 brands, which include industry-leading exhibitions and digital services across 13 countries. Margaret joined UBM in 2008, before its combination with Informa in 2018. In the last 12 years, she has spearheaded multiple milestones in key market sectors and successfully grown the business through organic development and strategic partnerships.

Prior to this, she held senior positions at TNT and Global Sources, and is the co-founder of the leading online expat community ShanghaiExpat.com. Margaret is a member of the Common Purpose Dao Xiang advisory board and received an MBA degree from Oxford Brookes Business School.

Daniel Pinto

Daniel Pinto is the Founder, Chairman and CEO of Stanhope Capital, the global investment management and advisory group overseeing approximately US$30 billion of client assets. He has considerable experience in asset management and merchant banking having advised prominent families, entrepreneurs, corporations and governments for over 25 years.

Formerly Senior Banker at UBS Warburg in London and Paris concentrating on mergers and acquisitions, he was a member of the firm’s Executive Committee in France. He was also Chief Executive of a private equity fund backed by CVC Capital Partners. Daniel founded the New City Initiative, a think tank comprised of the leading independent UK and European investment management firms. He is the author of Capital Wars (Bloomsbury 2014), a book which won the prestigious Prix Turgot (Prix du Jury) and the HEC/Manpower Foundation prize.

Sue Prevezer KC

Sue is a qualified solicitor and barrister at Brick Court Chambers, where she practices as an arbitrator and mediator. She has over 30 years of experience of arguing and managing large complex commercial cases at every level of the UK judicial system and in arbitration.

From 2008-2020, Sue was Co-Managing Partner of law firm Quinn Emanuel Urquhart & Sullivan (UK) LLP where her clients included major corporates, funds, investors, trustees, office holders and high net worth individuals, for whom she managed complex, high value, domestic and international litigation. Sue has particular expertise in company, insolvency related, securitisation and restructuring litigation.

Miles Young

Miles spent almost 35 years at Ogilvy, ultimately as its global Chairman and CEO. He is currently the Warden of New College at Oxford University. Miles joined what was then the ‘advertising’ business from Oxford in 1973, eventually moving to Ogilvy & Mather. After a period in the Asia-Pacific region based in Hong Kong, and working especially in China, he moved to New York in 2008 as Chief Executive, then Chairman of Ogilvy & Mather Worldwide.

From then until 2016 Miles led a period of strong client growth and creative success. In 2016, Miles returned to his Alma Mater of New College in Oxford, where he is Warden. He is President of the Oxford Literary Festival and Chair of the Oxford Bach Soloists, amongst other voluntary activities. Miles is actively engaged in ESG efforts, maintaining oversight of S4Capital's ESG performance and instrumental in the development of disruptive and innovative ESG initiatives.

Board support

Caroline Kowall

Caroline spent over a decade in-house gaining broad and extensive experience at large, complex asset managers. She joined S4Capital in June 2022 from the Canada Pension Plan Investment Board (Toronto and London) where she was a senior member of the legal and compliance teams.

Caroline was in private practice earlier in her legal career at Ashurst and Milbank in the City of London. She obtained her legal degrees and masters in France and the UK and is qualified to practise law in England and Wales and Ontario, Canada.