Over the past year, data storage companies have moved sharply higher. Western Digital, Seagate, and SanDisk have all benefited from a market narrative that is easy to understand: if artificial intelligence is going to require an extraordinary buildout of compute infrastructure, it is also going to require an extraordinary buildout of storage infrastructure.
That thesis strikes me as directionally correct. AI models do not merely require GPUs. They require vast repositories of training data, intermediate outputs, synthetic data, user interactions, logs, backups, compliance archives, and low-cost cold storage. Inference at scale will only add to the data exhaust. The more useful AI becomes, the more data it will generate, store, retrieve, and preserve.
This thesis has been part of the Situational Awareness theme championed by Leopold Aschenbrenner, whose investment fund has profited handsomely from investments in SanDisk and other players. (Read our related article, along with selected undervalued investment ideas that are already seeing an acceleration in demand.)
As often happens, however, the market has first rewarded the most visible beneficiaries. The device makers are obvious. Their products sit directly in the path of demand. If hyperscalers need more nearline storage, the first order of analysis points to the companies that make hard disk drives and flash storage products.
The more interesting question, at least for value investors, is what lies beneath them.
If Western Digital, Seagate, SanDisk, Kioxia, Micron, Samsung, SK Hynix, and the tape vendors are the visible storage layer, then there is a less visible materials layer below them. Modern storage devices depend on specialty glass, cobalt, platinum, ruthenium, helium, tantalum, silicon, copper, rare earth magnets, and other materials that are produced by mining, refining, and specialty-materials companies around the world.
Some of those companies remain available at value prices.
This is not a call to buy a basket of commodity stocks simply because AI exists. The purpose of the exercise is more specific: to identify small-cap public companies whose products connect to the data-storage supply chain, whose valuations remain modest, and whose upside could be enhanced if storage demand becomes a larger and more strategic driver of incremental demand.
In other words, the storage story may already be in the stocks of the device makers. It may not yet be fully reflected in selected upstream suppliers.
The storage boom is not just a device story
The simple version of the AI storage thesis is that more data means more drives. There is truth in that. Hard disk drives remain the dominant medium for low-cost, high-capacity data-center storage, especially for nearline and warm data. NAND flash and SSDs serve higher-performance use cases. Tape remains relevant for archival storage at hyperscale.
But a storage device is also a collection of materials. A modern enterprise HDD is not just a spinning platter in a box. It contains ultra-flat glass or aluminum substrates, magnetic recording layers with cobalt and platinum, ruthenium spacer layers, rare earth magnets, helium fill, nickel-phosphorus coatings, copper-aluminum electronics, and gold wire bonds. SSDs, meanwhile, sit within the semiconductor supply chain: polysilicon, silicon wafers, tantalum capacitors, copper interconnects, cobalt liners, tungsten vias, and other specialized inputs.
The key investment question is not whether these materials are used. They are. The harder question is whether the storage end-market is large enough to matter to the economics of the companies producing them.
The honest answer is mixed. In most cases, storage is not the price-setter. Electric vehicles, wind turbines, solar modules, general semiconductor demand, industrial activity, and geopolitics are usually more important. For copper, storage is a rounding error. For rare earths, HDD motors matter, but EV motors and wind turbines matter more. For cobalt, batteries and broader industrial uses dwarf storage. Even for helium, where sealed enterprise HDDs are a real use case, other industrial and scientific applications matter greatly.
That caveat is central to the analysis. There is no clean public equity that gives investors a pure-play exposure to data storage materials. Investors who want pure storage exposure should likely own the device makers. The opportunity explored here is different. It is the possibility that certain materials companies are cheap on conventional metrics, have survivable balance sheets or strategic assets, and may receive a marginal tailwind from the storage buildout alongside other demand drivers.
For a value investor, that marginality matters. The best setup is often not a pristine growth story at a high multiple, but a neglected cyclical or asset-heavy company where the downside is anchored by book value, cash flow, or strategic resource value, and where a new demand leg can shift the market’s perception.
Where storage touches the materials chain
The upstream storage map begins with hard disk drives. High-capacity HDDs increasingly depend on glass platters because glass can meet the surface tolerances required for advanced recording technologies such as HAMR and MAMR. HAMR, or heat-assisted magnetic recording, also raises the importance of platinum-bearing media. Current and next-generation magnetic media use combinations of cobalt, platinum, chromium, iron-platinum alloys, and ruthenium interlayers.
Helium is another important ingredient. Sealed helium drives reduce turbulence inside the drive, allowing more platters to fit inside a standard enclosure. Each drive uses a small amount, but hyperscale volumes make the aggregate meaningful. The helium market is structurally tight and unusually concentrated, which means incremental demand can have strategic significance even when absolute volumes appear modest.
Then there are rare earth magnets. HDD voice-coil motors and spindle motors use Nd-Fe-B magnets, with dysprosium and terbium added for thermal stability. The per-drive content is small, but the supply chain is the same geopolitically sensitive rare earth magnet chain that also serves EVs, wind turbines, defense systems, and industrial automation.
On the SSD and NAND side, the link is through semiconductors. NAND flash begins with ultra-high-purity polysilicon and wafers. Tantalum appears in capacitors and barrier metals. Copper and cobalt are used in semiconductor interconnects. Tungsten remains important in vias, contacts, and gates. The storage-specific share of these markets varies widely, but the direction of travel is clear: more data infrastructure means more semiconductor content, more storage controllers, more high-density NAND, and more upstream materials demand.
Magnetic tape is a smaller part of the investment case. LTO tapes use barium-ferrite and strontium-ferrite particulate media, but those supply chains are not especially accessible through small-cap public equities. Tape remains important operationally, especially for cold archives, but it is less actionable for this screen.
A value screen, not a thematic screen
The accompanying report starts from the materials map and then applies a value discipline. The universe consists of public companies globally that produce or develop storage-relevant materials. The screen focuses on companies with market capitalizations between roughly $20 million and $2 billion, and on names that pass either a price-to-book or price-to-sales test. Producers and late-stage developers are included. Early-stage exploration stories are largely excluded.
This distinction matters. A theme can be right and still produce poor investment results if purchased at the wrong price. Many rare earth, helium, and battery-materials stories already trade at valuations that require a great deal to go right. In some cases, the market is capitalizing hope rather than cash flow or tangible asset value. That is not the exercise here.
The goal is to find companies where the market already discounts cyclicality, country risk, financing risk, or operational complexity. The storage exposure then becomes a possible accelerant, not the sole reason to own the shares.
The final shortlist in the report includes ten producers and three late-stage developers.
Five anchor ideas from the storage-materials basket
In this memo, we profile five anchor ideas that best illustrate the opportunity set: a Japanese specialty-glass company tied directly to HDD substrates, a diversified critical-materials producer with strategic tantalum exposure, a deeply discounted polysilicon name with meaningful jurisdictional risk, a low-cost PGM producer linked to HAMR media, and a stressed cobalt/nickel situation with substantial optionality.
The common thread is not purity of exposure, but the combination of storage relevance, asset value, and market neglect.
