Arm Stock Drops 8% on FTC Probe as Samsung Strike Rocks Chip Sector

This week, the global semiconductor industry was hit by two separate but mutually reinforcing shocks. These shocks exposed big AI and consumer tech supply chains to risks that are very different from each other but have one thing in common: Nvidia, Apple, and Qualcomm are at the center of both.

The price of Arm Holdings (NASDAQ: ARM) stock dropped 8.46% after Bloomberg reported that the U.S. Federal Trade Commission has begun an antitrust probe into how Arm licenses chips.

At the same time, more than 45,000 workers at Samsung Electronics are planning to go on strike for 18 days starting May 21. This will be the biggest labor action in the company's history. South Korean officials are considering emergency arbitration to ban all strikes for 30 days before the walkout starts.

The FTC Probe: What Arm Is Being Investigated For

The main question the FTC is looking into is whether Arm has used its strong position in chip licensing to hurt competitors while it grows its own chip company.

More specifically, investigators are looking into whether Arm has done things that make it harder for competitors to get licenses for its core processor technology while also making goods that compete with those licensees.

Reports say that the FTC has asked Arm to keep investigation-related documents safe. This is a normal early-stage investigative procedure that shows the investigation is ongoing and not just preliminary.

Arm has never made chips itself. Instead, it licenses CPU design blueprints and processor instruction sets. This is how the ARM architecture works, which powers almost all modern smartphones and a growing number of data center processors.

Arm has been moving away from smartphones and toward AI infrastructure and data center computing under CEO Rene Haas. The company is also making more full processor products that some clients see as direct competition to designs built on Arm's own licensed technology.

Qualcomm has been the most vocal opponent of this path. After Qualcomm bought Nuvia in 2021, the fight between the two companies got worse and turned into a legal battle over Arm's license terms. Qualcomm won the case, but Arm is still appealing some parts of it.

Separately, South Korea's antitrust agency has been looking into Arm's offices in Seoul since November, and European officials have also looked into complaints about how the company handles licenses. The FTC probe adds government oversight from the U.S. to a regulatory picture that already includes rules from many countries.

Arm says Qualcomm's complaints are about bigger business problems, not real antitrust worries, and says they are not intentional. Still, the company's stock has almost doubled so far this year thanks to demand driven by AI. This means that the 8% drop in a single session due to regulatory news was a big but only part of a much bigger gain.

The exposure further down the line is important. The Grace data center CPU and the Project Digits AI workstations from Nvidia both use ARM cores. ARM design is used to build all of Apple's processors, including the M-series chips for Macs and the A-series chips for iPhones. The Snapdragon X Elite PC processors and core mobile systems from Qualcomm need to license the ARM instruction set in order to work.

Any changes to licenses or royalty rates that are made because of an FTC enforcement action would have effects on the whole chip design environment that are hard to predict ahead of time.

The Samsung Strike: What 18 Days of Memory Disruption Would Cost

Samsung Electronics makes about a quarter of all of South Korea's exports and is the biggest memory chip maker in the world.

Starting May 21, Samsung's chip operations will stop all production for 18 days. This is a first-of-its-kind operational disruption for Samsung and all of its customers who count on its DRAM, NAND, and HBM output.

From an AI infrastructure point of view, the time couldn't be worse. The world memory market already has a huge supply gap—SK Hynix and Micron have already booked all of their 2026 HBM capacity.

Neither of them can really make up for Samsung's large-scale output. Competing sources don't have many HBM3 and HBM3E in stock; spot prices for regular DRAM and NAND would probably go up within a few weeks of Samsung stopping production for good.

Reports say that Nvidia is worried about a possible slowdown in its memory supply. For its data center GPU production, Nvidia relies on Samsung's HBM output along with SK Hynix.

If Samsung's production stops during a peak in demand for AI servers, it will make it harder for Nvidia to fill GPU orders. Smartphone makers and PC OEMs that have built up low stock levels before the strike start date are also vulnerable to changes in the price of memory, which has an effect on their gross margins.

The Combined Risk Picture for the Chip Sector

When looked at together, the two shocks move the risk in the chip sector from end demand, which is still strong, to supply lines and licensing infrastructure. In neither story does it talk about making AI or shopper demand weaker. You can read both stories to find out if the basic inputs that meet that demand can be provided reliably and cheaply.

South Korean officials are thinking about putting an emergency 30-day ban on strikes through arbitration. This is the most direct way to solve the Samsung risk in the short term. If arbitration is ordered before May 21, the strike will not happen, and worries about supply will go away. If the talks fail and the walkout goes ahead as planned, the memory market will get even tighter because there won't be enough supplies to meet the demand.

The schedule for the Arm FTC probe is longer and not as clear-cut. An review like this by the FTC usually lasts for months before any action is taken, if any. Arm's stock reaction shows that there is immediate uncertainty about the royalty and licensing model. The real effect on business rests on what the investigation finds and whether the FTC goes after enforcement.

Keep an eye on two specific events over the next two weeks. When it comes to Samsung, the question is whether South Korean arbitration is used before May 21 and whether union talks resume with real offers.

Concerning Arm, it will be interesting to see if the FTC makes any more document requests or if the probe gets bigger. It will also be interesting to see if Qualcomm, Apple, or other major licensees say anything in public about how stable their licenses are. In both cases, there is a big risk at the end for the chip supply chain at a time when demand for AI infrastructure is very sensitive to problems.