The son of a close advisor to Iran’s Supreme Leader allegedly moved billions of dollars through some of the biggest names on Wall Street. Now the US Justice Department wants to know how.

Federal investigators are examining how Hossein Shamkhani, an Iranian oil trader, reportedly used global banking networks, including JPMorgan Chase and Standard Chartered, to facilitate massive sanctions-evading oil and commodity sales. Shamkhani isn’t just any oil trader. He’s the son of a prominent advisor to Ayatollah Ali Khamenei, which makes this less of a routine compliance case and more of a geopolitical flashpoint.

Following the money through Wall Street

The Treasury Department’s Office of Foreign Assets Control (OFAC) sanctioned Shamkhani on July 30, 2025. That designation formally put the financial world on notice about his activities, but the DOJ investigation suggests the transactions had been running for some time before that.

On March 6, 2026, prosecutors escalated the matter by filing civil forfeiture complaints targeting over $15.3 million connected to Shamkhani’s network. The complaint alleges these funds are tied to illicit oil distribution operations that ultimately supported Iran’s Revolutionary Guard Corps, or IRGC, a designated terrorist organization.

The banks named in the investigation, JPMorgan Chase and Standard Chartered, are no strangers to sanctions-related scrutiny. Standard Chartered paid $1.1 billion in 2019 to resolve prior sanctions violations.

The Shamkhani network

Shamkhani is accused of leading a complex web of companies involved in selling Iranian oil in violation of US sanctions. The network allegedly obscured the origin of crude oil shipments, routed payments through intermediary jurisdictions, and used front companies to access dollar-denominated banking services.

A separate but related DOJ investigation in March 2026 examined the use of the Binance cryptocurrency exchange by Iranian entities for sanctions evasion, involving over $1 billion in transfers.

What this means for investors

For anyone with exposure to large-cap bank stocks, the immediate question is liability. Neither JPMorgan nor Standard Chartered has been accused of knowingly facilitating Shamkhani’s activities, and the distinction between a bank being used as a conduit and a bank being complicit is enormous, both legally and financially.

For crypto markets specifically, the Binance sanctions probe is worth watching. Over $1 billion in alleged Iran-linked transfers through a major exchange is the kind of finding that tends to accelerate regulatory action.