First Long Island Investors, LLC

Overview

First Long Island Investors, LLC provides wealth management, customized asset allocation, global diversification, risk and liquidity assessment, concentrated portfolio management, financial planning, wealth administration, and family office services.²

The firm reports approximately $2.3 billion in assets under management as of December 31, 2025.¹

History

Robert D. Rosenthal conceived First Long Island Investors and co-founded the firm with Ralph F. Palleschi in 1983. The firm says the Entenmann families became its first clients after the founders’ work at Entenmann’s Bakery.³

The SEC’s Investment Adviser Public Disclosure database lists FIRST LONG ISLAND INVESTORS, LLC under CRD 167212, with SEC registration approved effective July 13, 1984.⁴

Timeline

1. 1983Palleschi in 1983.
2. 1984The SEC’s Investment Adviser Public Disclosure database lists FIRST LONG ISLAND INVESTORS, LLC under CRD 167212, with SEC registration approved effective July 13, 1984.
3. 2025The firm reports approximately $2.3 billion in assets under management as of December 31, 2025.

Leadership

Robert D. Rosenthal is Chairman, CEO, and CIO. Ralph F. Palleschi is President and COO.³

Other listed leaders include Philip W. Malakoff, Executive Managing Director and Director of Research; Edward C. Palleschi, Executive Managing Director; and Jonathan A. Golub, SVP, General Counsel, and Chief Compliance Officer.⁵

Services

Financial planning includes estate and generational wealth planning, post-business-sale counsel, retirement strategies, philanthropic guidance, tax optimization, insurance advisory, and college planning.²

Family office services include cash-flow management, tax coordination, gift and philanthropic planning, coordination with outside legal and accounting advisers, insurance planning, and family governance guidance.²

What the firm offers

• Investment management
• Financial planning
• Tax planning
• Philanthropy
• Family governance and education
• Administration and bill pay
• Risk and insurance
• Retirement planning

Client Focus

The firm says it primarily serves clients with $5 million or more, including families, individual investors, executives, and business owners.⁶

Approach

First Long Island Investors says it follows a long-term approach designed to preserve and grow client net worth while seeking positive after-tax returns and minimizing risk and volatility.⁷

The firm says it invests its own capital alongside clients in the strategies it recommends and reviews client asset allocations quarterly through its Investment Committee.⁸

Assets and Minimums

First Long Island Investors reports approximately $2.3 billion in assets under management as of December 31, 2025.¹

The firm says it primarily serves clients with $5 million or more.⁶

By the numbers

FAQs

Related resources

• LocationMultifamily offices in New York

  The New York multifamily offices page gives families and business owners a regional view of firms serving clients in the area. It can help readers compare how investment management, financial planning, philanthropy, and family education may be organized for clients based in Long Island or elsewhere nationwide.

• Network siteCapitalGainsTax.com

  CapitalGainsTax.com offers practical guides on capital gains tax and planning strategies. Readers considering investment management can use it to frame questions about portfolio sales, tax planning, charitable giving, and coordinating investment decisions with broader family or business goals.

• Network siteFamilyOffices.com

  FamilyOffices.com provides resources and a community focused on single family offices and wealthy families. Its materials can help readers think through family governance, education, philanthropy, administration, and the practical responsibilities that arise when several generations or family entities share financial interests.

• GuideMultifamily office fees

  The multifamily office fees page explains common fee approaches and the services that may be included. Families and business owners can use it to prepare questions about investment management, financial planning, tax work, administration, bill pay, and how costs relate to the scope of ongoing support.

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  Profiles of Bessemer Trust, Ehrenkranz Partners, and The Abernathy Group II Family Office offer additional points of comparison on this site. Readers can review how firms serving wealthy families describe investment management, planning, governance, philanthropy, and related services before deciding which questions to ask.

Sources

Claim or correct this profile

This profile is a factual summary written in our own words from public sources. It is for information only. It is not an endorsement, rating, ranking or recommendation, and it is not investment advice. MultiFamilyOffices.com is not affiliated with the SEC or with this firm unless stated. Form ADV figures are self-reported by the firm.