United States

Mainstream in North America

Our US fund administration service offers investment managers a conduit into the largest hedge fund and private equity markets in the world.

Mainstream Fund Services, Inc is a full-service fund administration firm dedicated to partnering with their clients to provide accurate, timely and comprehensive accounting services to the financial services industry.

With offices in the New York City metro area and clients around the world, Mainstream's highly professional and seasoned associates provide world class service, transparency and oversight along with independent data verification. Cutting edge technology is fully automated, flexible and provides a cost-effective level of reliability that meets the specific needs of sophisticated investors.

Our experts bring a mix of complex domestic and international experience covering:
  • Hedge funds, private equity, venture capital, real estate, fund of funds
  • Accounting and fund administration
  • Investor services and reporting 
  • Business structuring
  • Tax and audit support

Time in United States:

New York, United States Office

Mainstream Fund Services, Inc.
420 Lexington Avenue, Suite 2260
New York, NY 10170

Ronkonkoma, United States Office

Mainstream Fund Services, Inc.
4175 Veterans Memorial Highway,
Suite 204, Ronkonkoma, NY 11779

Google Map of 420 Lexington Avenue, Suite 2260 New York, NY 10170

Google Map of 4175 Veterans Memorial Highway, Ronkonkoma, NY 11779 USA

Our Staff

Denise dePaola

Denise DePaola

Chief Executive Officer, Americas

Denise DePaola is CEO of Mainstream’s US operations. Denise has over 20 years of experience in public accounting and the alternative investment / financial services arena, with a particular emphasis on fund administration and business development. Denise has been licensed by the State of New York as a Certified Public Accountant (CPA). Denise has also been recognized as a thought leader, game changer and executive of the year by the hedge fund administration and consulting industry. She received a BA in Accounting and Information Systems from CUNY Queens College, NY, attended Fairleigh Dickinson University, NJ and Wroxton College, Oxfordshire, England. Denise is an active board member of the Dying to Live foundation.  

Contact Details:

+1 631 737 4500

Jay Maher

Jay Maher

Chief Executive Officer, Private Equity, Venture Capital and Real Estate

Jay is a recognised leader in private equity administration with more than 24 years of industry experience. He is responsible for Mainstream’s private equity, venture capital and real estate fund administration business globally.

Prior to joining Mainstream, Jay built SS&C’s Private Equity Services Group from 2004 to 2015. Most recently he founded boutique private equity administrator Paddock Fund Services.

Jay earned a Bachelor of Science in Accounting from Rowan University.

Contact Details:

+1 212 802 7980


Fundadministration, now part of Mainstream, was founded in New York in 1999 as a boutique fund administrator. Denise DePaola, CEO, joined the Company in 2005 and subsequently acquired the firm in 2013 before its merger with Mainstream in 2016.

Since then, the Company has experienced stability and continued growth. Denise built up her team over the years and has successfully implemented PFS-PAXUS software to service the needs of her growing clientele.

Mainstream Fund Services, Inc employs seasoned professionals with no turn-over in staff. The average tenure is 8 years with the company and 16 years’ industry experience.

The Company has received industry recognition for the quality of its services and client loyalty.

Global Expertise

Mainstream Fund Services, Inc is part of Mainstream Group Holdings Limited (ASX: MAI), a listed company specializing in fund services. The Group provides fund and superannuation administration services underpinned by investment in people, processes and technology.

As at December 2018 the Group provides administration services to 921 funds and more than 104,000 investors with assets under administration in excess of AUD $147 billion. Mainstream employs over 256 people, with operations in Australia, Singapore, Hong Kong, the United States, Ireland, the Isle of Man, Malta and the Cayman Islands.

Learn more about Mainstream worldwide.

Why Mainstream is “Just Right”

Reliably proven success by the numbers:
Years Experience
In Funds Outsourced to Mainstream

Local Services

Mainstream Fund Services provides administration services to hedge funds, private equity funds, venture capital, fund of funds, EB-5 Funds as well as family offices and managed accounts across a variety of asset classes.

Core services include:

  • Trade Reconciliation and Reporting Services
  • Automated trade capture
  • Customized reporting services
  • Secure web portal
  • Administration Services
  • Daily, weekly or monthly NAVs
  • Anti-money laundering (AML)/Foreign Account Tax
  • Compliance Act (FACTA) compliance
  • Registrar and transfer agency services
  • Fee and returns calculations
  • Partner allocations
  • Additional Support Services
  • Cash management / Escrow
  • Bookkeeping and bill paying
  • Financial statements
  • Audit and tax coordination

Fundadministration (now Mainstream Fund Services) was awarded Best Hedge Fund Administrator 2016 (Wealth & Finance 2016) and Best Full Service Administrator 2016 (AI Hedge Fund Awards 2016 and Alt Credit Intelligence US Services Awards 2016).


  • Office opened: 1999
  • Country manager: Denise DePaola
  • Specialities: processing of transactions and cash management, investor services (registrar and transfer agency functions), fund accounting and NAV calculation, audit and tax co-ordination
Over $147 billion in funds are outsourced to Mainstream: