• A Global Merchant Bank

    Advising Leading Family Offices and

    Long-Term Investors

  • About Us

    Participant enables family capital and other long-term investors to successfully invest in attractive companies and enables businesses to access this unique source of capital

    Participant also advises a select group of long-term strategic investors including select Pensions and Sovereign Wealth Funds

    Participant's mission is to serve as a trusted partner and advisor to our clients. We strive to provide the highest quality strategic advice and transaction execution capability across direct investing, mergers and acquisitions, capital placement and financial advisory services

    Participant's network of more than 500 of the world's largest family offices and other long-term investors actively investing across a range of industries, stages and geographies

    Participant deeply understands the dynamics and specific needs of privately held businesses and offers a unique platform to bridge the gap between long-term capital and entrepreneurs

  • Leadership Team

    Our founders bring investment expertise, hands-on operational know-how and experience advising many of the world’s largest family offices and long-term investors

    Sean Costello

    CEO, Managing Partner

    Sean has more than 20 years financial markets experience in US and Europe across investment banking, equity research and UHNW/ Global Family office private banking. He has worked in senior roles at firms including Morgan Stanley, Lehman Brothers, Barclays, and RBC. Sean's clients include some of the largest family offices globally and he has led numerous private equity transactions on behalf of these family offices. He has extensive experience in debt and equity markets including leading multi-billion transactions.


    Sean is an honors graduate of the University of Pennsylvania and holds an MBA from Duke University’s Fuqua School of Business. In addition, he currently sits on the investment committee for several family offices and foundations in the US and Europe. He is currently completing a part-time masters in International Relations with a focus on global trade at Cambridge University in the UK.


    Contact: scostello@participant.capital

    Michael Kurdziel

    Managing Partner

    Michael brings experience both working with family offices in the private equity and venture space to managing the direct investing activities for leading family offices. He has more than 20 years of experience in investment banking and private equity investing at Morgan Stanley and Merrill Lynch. Michael has led Private Equity investing for several family office, and has experience sourcing and managing venture capital investments. He was a co-founder of a venture capital backed technology firm, DealerTrack (NASDAQ: TRAK), which secured more than $75mm in financing before going public in 2005. Over the course of his banking and private equity career, he has led numerous equity and debt transactions totalling more than $1 billion in value. Michael's areas of expertise also include structured credit and debt placement. Michael serves on the board of several private companies and non-profits.


    He earned his BA from Trinity College with High Honors and an MBA from Duke University’s Fuqua School of Business.


    Contact: mkurdziel@participant.capital

    Daniel Costello

    Managing Partner

    Daniel most previously worked for five years as SVP of global M&A and Strategy at News Corp. Under his leadership, News Corp completed over $2.5 billion of investments including the acquisitions of Move.com ($1B, US), Harlequin ($400M, CA), Unruly ($200M, UK), Wireless Group/Sports Talk ($200M, UK), Storyful ($20M, Ireland), as well as additional acquisitions across multiple technology and media sectors in India, Thailand, Australia and Europe. Daniel previously founded a London-based research firm, Titan Advisers, which provided research and financial analysis to both corporates and large global institutional investment firms. Daniel worked for over a decade as a journalist for The Wall Street Journal and the Los Angeles Times as a financial journalist covering economics, healthcare and politics.


    Daniel earned his BA from the University of Pennsylvania with a degree in economics and Japanese, and an MBA from Duke University’s Fuqua School of Business.


    Contact: dcostello@participant.capital

    Karen Mitchell

    Vice-President, Client Relations

    Based in London, Karen Mitchell works with Participant on strategic initiatives, communications, and high-end global event management. As well as supporting Participant, Karen is the founder of Giraffe which is a bespoke strategic communications firm where she and her team manage and host large scale, exclusive exhibitions and events globally and develop integrated communications for their clients (e.g. TV, social, and print campaigns). Giraffe is especially proud of the work they have done creating and hosting numerous global trade missions to China as well as opening the external calendar for the 69th UN General Assembly at the United Nations Headquarters in New York for UN Women supported by Yoo Soon Taek, the wife of UN Secretary General Ban Ki Moon.


    Karen has owned Giraffe for the last 20 years and during that time has worked with global clients including Santander, Barclays, Capgemini, Commonwealth Business Council, UK’s National Health Services, AbbVie, College of Medicine, Keyline Brands, WIE (Women Inspiration & Enterprise), HIMSS UK, Department of Health, Bahamas Government, Godrej UK, Philips, UKTI, LDNY Foundation, Macmillan Cancer, Bupa, Parkinson’s, Duchy Originals, Kidney Care and NHS England.


    Contact: kmitchell@participant.capital

  • Global Network

    We are passionate about introducing our clients to each other and encouraging dialogue between them. Our summit's are invite-only and only open to single family offices. We tailor the content to their needs with a high profile speakers from principals of family offices to heads of Industry. Our summits are never filmed or recorded and all conversations are classed as off the record.

    Family Office Summit
    London, May 2019

    Hosted by Bloomberg


    Our speakers included:

    • Ariane de Rothschild, Chairwoman of the Board of Directors of
      Edmond de Rothschild (Suisse) SA
    • Jeremy Ferrar, Director, The Wellcome Trust on Global Philanthropy,
      and Healthcare Innovation and Outcomes

    Family Office Summit
    New York, May 2018

    Hosted by Bloomberg


    Our speakers included:

    • Dr. Rajiv Shah, President, Rockefeller Foundation,
      on Global Philanthropy
    • Ambassador William J Burns, President of the Carnegie
      Endowment for International Peace, Fmr. Dep. Sec of State,
      Fmr. Ambassador to Russia
    • Advisory Services

      Participant works with leading independent and family-owned businesses to access and secure long-term strategic investors. We support our clients in the following ways:

      Mergers and Acquisitions

      Participant offers a tailored approach to family offices and long-term investors and businesses that are seeking to acquire or sell companies in a wide range of industries and stages. We provide a full suite of M&A services including sourcing, due diligence, valuation, structuring and deal execution

      Debt and Equity Placement

      Participant assists clients in securing equity and debt capital for growth, recapitalization and liquidity. We source capital from traditional investors, as well as from our unparalleled network of more than 500 of the world's largest private investors

      Strategic Advisory

      Participant provides advice to family-owned businesses and other companies. We work with clients to identify growth opportunities, explore corporate alliances, and develop M&A strategies. We leverage our extensive global/local relationships to provide our clients with balanced and insightful judgment on key strategic and financial initiatives

      Fund Formation

      Participant helps to raise capital for both new and established funds on a selective basis. We concentrate on differentiated investment strategies that are well-aligned with the longer term focus and sector expertise

    • Direct Investing

      Participant develops and co-manages direct investment programs for family offices and long-term investors on direct investments into attractive businesses.


      We work as an advisor alongside family offices and long-term investors to manage their direct investment initiatives providing:

      Private Equity Program

      Participant works with family offices and long-term investors to develop direct investment programs focused on Private Equity. a comprehensive approach to managing direct private equity activities, with services ranging from strategy formation and sourcing to investment management and exits. Our platform covers all aspects of direct investing

      Venture Capital Program

      Participant partners with family offices and long-term capital to manage their venture capital programs. We take a comprehensive approach to managing venture activities, with services ranging from strategy to entity formation to investment management and exits. Our approach covers all aspects of the corporate venture capital
      life cycle

      Co-Investment Sourcing

      Participant leverages our global network of the world's leading families and strategic investors to source investments from well-aligned co-investors. Families in our network invest from venture capital through large buyouts

      Family Office Formation

      Participant understands what it takes to successfully create a sophisticated family investment platform. We advise family offices on developing investment strategies; building out investment capabilities; and recruiting a world-class teams

    • Investment Focus

      Participant's clients invest in companies with exceptional growth potential

      Our clients' direct investing varies by industry, geography and stage. All companies in which we invest share common attributes of market leadership, innovation and an ability to thrive in the New Economy

      We seek investments on behalf of our family office and long-term investor partners in many sectors including the following:

      Key Characteristics

      • Strong growth potential
      • Sustainable, recurring revenues
      • Competitive advantage
      • Strong management
      • Clear market leadership
      • Deep addressable market

      Sectors & Industries

      • Venture: $1m to $25m
      • Growth: $10m to $150m
      • Buy-out: up to $500m EV
      • Special Opportunities
      • Primary Equity Focused
      • Structured / Mezzanine Debt

      Sectors & Industries

      • Business Services
      • Financial Services
      • Healthcare
      • Media & Technology 
      • Retail & Consumer
      • Special Opportunities
    • Locations

      We are a global firm working with clients across various geographies

      New York

      1325 6th Ave

      New York, NY 10019


      14 Hanover Street
      Mayfair, London, W1S 1YH


      246 Walnut Street

      Newton, MA 02460

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      Webinar's available


      "What Comes Next: Global Health in the Age of COVID19"

      An in-depth interview with Dr. Tedros Adhanom Ghebreyesus, Director General of the World Health Organization (WHO) and John W.H. Denton, Secretary General, International Chamber of Commerce (ICC)