Blum, Matthew S.

Matthew S. Blum joined Rosenberg & Estis, P.C. in 2023 and is a Member with the firm's Litigation Department. As a litigator and trial counsel in several New York State and multistate law firms, Blum is a seasoned trial attorney, having represented clients in matters dealing in complex commercial, financial/securities, and real estate litigation. Blum has handled more than fifty trials through judgment and appeal, as well as appeals before all four New York Appellate Departments and California Court of Appeals.

Blum has represented Fortune 250 and closely-held corporations, manufacturers and distributors, military contractors, casinos, financial institutions, and government agencies. Blum has prosecuted and defended complex cases in a wide array of commercial practice areas concerning, for example, copyright, Lanham Act, trademark infringement, interbank disputes, mergers/acquisitions, derivative shareholder claims, partnership disputes/business dissolution, 18 U.S.C. 1962(a-d) RICO violations, construction, antitrust, Defend Trade Secrets Act/corporate espionage, and real estate disputes. Blum has worked on securities fraud cases involving transactions totaling hundreds of millions of dollars, and residential mortgage-backed securities cases resulting in recovery of over $1 billion dollars for institutional clients.

With his background in finance, Blum has served as special counsel and advisor to national banks, hedge funds, credit unions, RIAs, and loan servicers on defensive strategies in securities, banking, and real estate litigation, authoring statewide bank policy on New York-specific litigation strategies on various case issues. Blum has further served as regulatory/advisory counsel on securities offerings, PPMs, and development of innovative financial products. Beyond regulatory practice, Blum has served as litigation counsel in civil and enforcement proceedings involving REITs, the Martin Act/blue sky legislation, Sarbanes Oxley, Sec. & Exch. Act of 1934, and Reg. A/B governing sale of asset-backed securities.

Currently, Blum maintains a dynamic practice involving litigation and transactional matters. In his litigation practice, Blum focuses significant time to matters involving bet-the-company breach of contract, mergers/acquisitions, business dissolution, partnership/joint venture disputes, construction, dispositions of real estate, and landlord/tenant litigation.

In his transactional and advisory practice, Blum advises credit unions and lenders on financial product structures in connection with his clients' mortgage banking businesses. Blum serves as general counsel to domestic and international businesses on financing transactions, corporate organizational structures, and intellectual property. Mr. Blum brings to this work not only legal acumen informed by litigation experience, but also the benefits from having earned an M.B.A. in Corporate Finance with concentrations in derivatives and institutional risk management.

Prior to attending law school, Blum wrote computer software. He applies that expertise extensively in his litigation practice. For example, Blum has assembled and managed teams of attorneys, engineers, and data analysts in eDiscovery and ESI investigations, which have entailed review and analysis of millions of documents. Blum has created eDiscovery platforms and automation tools that have been used to analyze voluminous document productions in connection with public offerings, securities filings, loan and bond underwriting transactions, payroll and check registers, time records, and other electronically-stored materials used in securities cases and other complex class action litigation.

Prior to joining Rosenberg & Estis, Blum was Principal of the Blum Law Group.

Representative Matters 

  • Represented a global military contractor, prosecuting Lanham Act, Defend Trade Secrets Act, and business torts for misappropriation of proprietary technology used to assess blast radiation, achieving a favorable confidential settlement.
  • Served as of counsel to a Fortune 250 company and global contractor, prosecuting racketeering and bid rigging claims involving misappropriation of proprietary technologies, claims exceeding $100,000,000.00.
  • Served as of counsel to a Fortune 250 company in an international dispute over the sale and servicing contract concerning a VVIP aircraft, with claims totaling hundreds of millions of dollars, litigating in the International Chamber of Commerce, International Court of Arbitration, Paris, France.
  • Defended a taxi company and its principals from an unfair competition lawsuit brought by a plaintiff-competitor who formerly employed the defendant-principals, winning summary judgment dismissal; the court invalidated the non-compete restriction plaintiff used for all of its employees.
  • Represented a scientist in prosecuting a $400 million-plus securities fraud scheme in the over-the-counter market, perpetrated by 39 defendants in eight states, resulting in settlement of all civil claims and the commencement of criminal and civil enforcement proceedings by the US Department of Justice and Securities & Exchange Commission.
  • Represented a general contractor in multiple concurrent lawsuits concerning a joint-venture to build a $27.2 million sky-rise, successfully defending owner claims for breach of contract while winning summary judgment on misappropriation claims against a joint-venturer.
  • Represented a nationally-recognized restaurateur in connection with her interactions with the press; a $1.6 million equity offering for her acclaimed restaurant; and resolution of a wage & hour litigation against her and the restaurant.
  • Represented a prominent economics professor and financial advisor before FINRA in defending claims brought by an international financial services company for breach of employment agreement/non-compete while counterclaiming for business torts, achieving a favorable settlement of all claims.
  • Represented lender as trial counsel for eight related, high-profile fraud cases dealing with defaulted residential loans secured by illegally-partitioned commercial property, serving as appellate counsel for one of the eight cases then pending in the New York Appellate Division, First Department, and another slated for the New York Court of Appeals.
  • Represented an online casino in intellectual property litigation with an international gaming distributor over license rights and use of trademarks in connection with the unlawful issuance of exclusive rights to the gaming distributor's subsidiary as part of an $825 million sale of the subsidiary to a Korean shell company.
  • Represented a manufacturer in disputes concerning breach of contract and violation of the Uniform Commercial Code in connection with goods shipped interstate through a foreign intermediary.
  • Represented a financial institution in prosecuting a fraudulent scheme perpetrated on multiple bankruptcy courts in connection with the unlawful sale of real property conveyed through a straw man.
  • Represented receivers of failed-bank assets in prosecuting residential mortgage-backed securities/ABS claims against intercontinental banks that securitized and sold prime and subprime mortgage bonds.

Areas Of Practice   

  • Litigation

Bar Admissions   

  • New York, 2014
  • U.S. District Court Southern District of New York
  • U.S. District Court Eastern District of New York


  • Hofstra University School of Law, Hempstead, New York
    • J.D., Concentrations in Securities and Corporate Law - 2012
    • Honors: Dean’s List – Top 15%
  • University of Florida
    • B.A. - 2008
  • Zarb School of Business, Hofstra University
    • M.B.A., Concentrations in Derivatives and Institutional Risk Management - 2012
    • Honors: Graduate with Distinction – Highest Honors for Masters Graduate
    • Major: Corporate Finance

Professional Associations   

  • International Defense Bar, Member
  • New York State Trial Lawyers Association
  • New York City Bar Association
  • Nassau County Bar Association
Matthew S. Blum
  • Member







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