The Houthis rapid advance toward one of the worlds most important shipping chokepoints is putting fresh scrutiny on the sprawling financial network that has helped transform the Iran-backed group from a Yemeni insurgency into a heavily armed regional power capable of threatening global trade.
The group has seized new territory along Yemens Red Sea coast, including the strategic port city of Mocha, and expanded toward the Bab el-Mandeb Strait. The waterway connects the Red Sea to the Gulf of Aden and carries a significant share of global maritime trade and energy shipments.
For the Trump administration, the Houthi advance is becoming as much a financial challenge as a military one. Washington is intensifying efforts to choke off the money sustaining Iran and its proxies, but the Houthis have built a sprawling sanctions-evasion network while controlling ports, trade routes and millions of Yemenis â raising a difficult question for Treasury: how do you cut off the cash fueling the group without cutting off food, fuel and other lifelines to civilians?
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The Houthis operate a financial network that extends far beyond Yemen, according to Adam Rousselle, founder of Between the Lines Research.Â
“Were dealing with a very well-capitalized group,” Rousselle told Fox News Digital.
In a 2025 investigation for the Global Network on Extremism and Technology, Rousselle traced a financing system spanning Houthi-controlled ports, tariffs, Iranian oil, informal hawala networks, cryptocurrency exchanges and foreign facilitators across Russia, Turkey and Southeast Asia.
Control of ports has historically been central to Houthi revenue because Yemen depends heavily on imports. Rousselles GNET report said the Houthis have imposed steep fees at ports they control and tariffs on goods brought into their territory from rival Yemeni ports.
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The groups latest territorial gains could strengthen that economic base even further.
Nadwa Al-Dawsari, a Yemen expert and associate fellow at the Middle East Institute, told lawmakers in Sept. 1 testimony before the House Foreign Affairs Committee that territory is central to the Houthis ability to withstand outside pressure.
“The most important source of that leverage is territory,” Al-Dawsa
