HBM4 photomask outsourcing arguments are validated by real-world experiments: Samsung and SK Hynix photomask outsourcing volume doubles, while Japanese companies DNP and TOPPAN take on orders

Five days ago, Citrini Research analyst Jukan published on X an industry observation that HBM4 photomask outsourcing would create a new market and that Japanese photomask makers would be the biggest winners—an observation translated by multiple outlets including ABMedia. In just five trading days, this “new market that previously did not exist” has moved from analyst inference to quantified facts confirmed by supply-chain officials in overseas media reporting. According to an industry interview cited by the Seoul Economic Daily, Samsung Electronics and SK hynix’s “domestic photomask outsourcing revenue this quarter” is more than double that of the same period last year.

Overseas media confirm outsourcing revenue doubled

The Seoul Economic Daily’s report provides first-hand supply-chain data beyond Jukan’s original inference. An unnamed industry insider said, “This quarter’s domestic photomask outsourcing revenue is more than double the same period last year.” A doubling at that magnitude is rare in traditional semiconductor materials markets—meaning Samsung and SK hynix are essentially reshaping the internal-versus-external manufacturing mix at a quarterly level, rather than making incremental adjustments.

The outsourcing strategy is clear: redeploy veteran engineers from the internal photomask unit to HBM4 development to align with Nvidia’s next-generation GPU “Rubin” mass-production timeline in the second half of 2026. SK hynix currently holds a 62% share of the HBM market. Micron (Micron) is in second place after surpassing Samsung, while Samsung is playing catch-up. The three memory makers are all pushing hard on HBM4 at the same time, shifting photomask demand from “internal consumption” to “external fulfillment.”

Fulfillers’ identities emerge: DNP and TOPPAN lead the way

Jukan’s original view named Dai Nippon Printing (DNP, Dai Nippon Printing) and TOPPAN Holdings as potential winners. While overseas reports have not listed each specific order flow line by line, industry public information and technical division of labor suggest that DNP and TOPPAN are indeed the main recipients. DNP has recently partnered with Tekscend to prepare High-NA EUV photomasks and announced it will supply 2-nanometer process photomasks for Japan’s startup Rapidus in 2027—moves that all point to DNP actively expanding advanced capacity.

TOPPAN Holdings (renamed from Toppan Inc in October 2023) oversees the TFT LCD, color filter, photomasks, and semiconductor packaging within its Electronics Business Group. TOPPAN’s stock price hit a record high of 5,928 yen on March 3, 2026; DNP’s stock price was around 2,958 yen in mid-April. Both are semiconductor precision-manufacturing branches of Japan’s century-old printing enterprises.

Jukan’s validation path: three tiers

From publication to verification, analysts’ industry predictions usually require three levels of validation: supply-chain insiders’ verbal accounts, second-party data (SEMI, Gartner, etc.), and disclosures from company financial reports. This Jukan viewpoint has advanced to the first tier—faster than what the vast majority of analysts’ inferences can achieve. There are two explanations: first, Jukan or Citrini Research may already have obtained similar signals before publishing and moved early to get ahead; second, information diffusion for this theme is extremely fast because Samsung and SK hynix are so large that any shift in quarterly-level procurement structure will quickly become visible across the supply chain.

Next data checkpoints to watch: the “semiconductor-related business” segment revenue growth rates in the next quarters’ financial reports for DNP and TOPPAN; the Ministry of Economy, Trade and Industry of Japan’s statistics on photomask exports; and the annualized change in Samsung and SK hynix’s “work-in-progress (WIP)” inventory. These three checkpoints will determine whether Jukan’s thesis is a “short-term event” or a “structural trend.”

What it means for investors

For institutional investors, the rapid validation of Jukan’s view provides a tradable time window. Buyer logic needs to answer three questions: first, is this wave of outsourcing volume doubling a “one-time restocking” or something “extendable through 2027”? Second, can DNP and TOPPAN’s non-EUV photomask gross margins absorb a large volume of orders without diluting? Third, do photomask makers in Taiwan and South Korea (such as eMemory? Enpower? etc., including Ewaya Electric, Sanfu Chemical, Taixin Photomask, etc.) have a chance to share the orders?

For retail investors, Japan stocks 7912 (DNP) and 7911 (TOPPAN) directly benchmark the targets; if participating via Taiwan stocks, one would need to enter through two peripheral beneficiary groups: “photomask concept stocks” and “ABF substrates + HBM packaging” beneficiaries. Whichever path you choose, it’s recommended to pair your entry with the official financial report disclosure schedule rather than relying solely on analyst inference. Jukan’s observation is still in the “being confirmed as it happens” stage rather than a “conclusion” stage.

This article’s HBM4 photomask outsourcing thesis has been validated by real-world developments: Samsung and SK hynix photomask outsourcing volumes doubled, and Japan’s DNP and TOPPAN secured orders—appearing earliest on 链新闻 ABMedia.