Federal prosecutors in Boston have unsealed charges against 30 people accused of running a decade-long insider-trading network built around stolen M&A intelligence. The U.S. Attorney’s Office said the scheme generated tens of millions of dollars in illicit profits by taking confidential information from law-firm systems and trading ahead of public deal announcements.
The case strikes at a sensitive point in market infrastructure: the trust placed in lawyers, deal teams and internal document systems before major transactions become public. Prosecutors allege privileged legal access was converted into a trading advantage, exposing weaknesses in document security, communications monitoring and pre-announcement market surveillance.
🚨#BREAKING: An #FBI Boston investigation has resulted in charges against 30 individuals for their roles in a global insider trading scheme that netted tens of millions in illicit profits.
The #FBI executed arrests in AL, CA, FL, NJ, and NY today for individuals who are accused… pic.twitter.com/jth0z28rKE
— FBI Boston (@FBIBoston) May 6, 2026
Prosecutors Allege Confidential Deal Files Fueled the Trades
The indictment, unsealed May 6, 2026, alleges that confidential merger and acquisition materials were misappropriated from several prominent U.S. law firms. That information was then allegedly passed to traders and intermediaries who executed positions before nearly 30 public transaction announcements, turning private deal knowledge into coordinated market abuse.
The charging papers identified at least 19 arrested defendants, two alleged fugitives in Russia and Israel, and nine people who had already pleaded guilty in related matters as early as February 2025. Prosecutors said the network extended across lawyers, facilitators, traders and overseas accounts, creating a layered structure designed to obscure who sourced the information and who profited from it.
Among those named were Nicolo Nourafchan, a corporate attorney who previously worked at firms including Sidley Austin, Latham & Watkins and Goodwin Procter, and Robert Yadgarov, a New York attorney accused of recruiting other lawyers. Gabriel Gershowitz has pleaded guilty and has been cooperating since February 2025, giving prosecutors an insider witness tied to the alleged flow of confidential information.
Investigators say defendants accessed internal law-firm networks and document-management systems to view confidential transaction materials, then passed tips in exchange for kickbacks. To avoid detection, they allegedly used burner phones, encrypted apps, coded language and device-free meetings, including in-person encounters where electronics were turned off or discarded.
Major Deals and Offshore Accounts Draw Scrutiny
The alleged trading touched major corporate transactions, including Cigna’s $54 billion acquisition of Express Scripts, Johnson & Johnson’s $30 billion takeover of Actelion and Amazon’s abandoned $1.4 billion bid for iRobot. Those examples underscore the scale of the deal flow prosecutors say was compromised through law-firm access.
Prosecutors also alleged that illicit proceeds were laundered through law-firm accounts, check-cashing services, shell companies and overseas brokerage accounts. The jurisdictions cited included Russia, Israel, Panama and Switzerland, suggesting a laundering architecture built to move profits away from U.S. enforcement visibility.
U.S. Attorney Leah Foley said the alleged trading on unannounced financial news violated securities laws and exploited the special access and ethical duties attached to a law license. Her statement places professional responsibility at the center of the case, not just securities fraud or illicit profit.
The indictment reinforces the need for stronger anomaly detection. Pre-announcement price and volume patterns can signal information leakage before formal disclosure, especially when trading activity clusters around sensitive M&A timelines.
The prosecution is a direct warning about the operational risk of weak access controls. Deal confidentiality now requires tighter permissions, stronger audit logs and better surveillance of internal document systems, particularly where attorneys and staff can view market-moving information.
The case is now moving through the courts, with prior guilty pleas already shaping related proceedings. Further arrests and hearings are expected as investigators pursue the alleged trading network and its laundering channels, according to the U.S. Attorney’s Office.
