Key Highlights

  • ASML and TSMC announced an industry transition to large-format photomasks for High-NA EUV, and Intel and Samsung also backed a 6x12-inch format.
  • Larger masks could remove High-NA's half-field stitching constraint, which Samsung says should raise fab productivity and lower chipmaking costs.
  • ASML guides to 2026 net sales of €43 billion to €45 billion and reports third-quarter results on Oct. 14, 2026.
  • ASML's US-listed shares closed at $1,747.90 on Sept. 22, up 2.14% on the day, giving the company a Market Value of about $662 billion after a roughly 60% gain in 2026.

ASML (NASDAQ:ASML) and TSMC (NYSE:TSM) have put their weight behind one of the biggest changes to chipmaking infrastructure in decades: moving the industry from the 6-inch photomask format it has used for generations to a larger mask built for High-NA extreme ultraviolet (EUV) lithography. The two companies announced the shift in an ASML press release titled "TSMC and ASML announce industry transition to large-format photomasks for High-NA EUV." On Sept. 8, 2026, ASML made separate announcements with Intel Foundry (NASDAQ:INTC) and Samsung Electronics that point in the same direction.

For ASML shareholders, the push matters for three reasons. It removes a practical obstacle to wider use of High-NA EUV, ASML's most advanced and most expensive system. It shows that the world's largest contract chipmaker is aligning with Intel and Samsung on a common roadmap. And it extends ASML's influence beyond the scanner itself into the wider mask ecosystem.

The change will take years. Mask blanks, writers, inspection tools and handling systems across the Supply chain all need to be redesigned. The near-term financial impact is therefore limited, but it strengthens the long-term case for High-NA adoption.

Why Mask Size Has Become a Bottleneck

A photomask, or reticle, holds the circuit pattern that a lithography scanner projects onto a silicon wafer. High-NA EUV systems use anamorphic optics that deliver finer resolution but expose only half the field of a standard EUV tool when paired with today's 6-inch masks. Chipmakers must therefore split large chip designs across two exposures and stitch them together, or plan layouts around the smaller field. That adds complexity and cost, especially for the very large AI processors driving demand.

A larger mask, described by Intel and Samsung as a 6x12-inch format, would allow a full-size field in a single exposure. In its Sept. 8 release, Samsung said the larger format is expected to increase fab productivity, reduce chipmaking costs and eliminate stitching constraints. Samsung also said it would join the industry initiative to advance the new mask technology.

Intel and Samsung Line Up Behind the Shift

The Intel Foundry announcement shows how far High-NA has already come. According to ASML's Sept. 8 release, the collaboration has processed more than one million wafers on High-NA tools, including Volume production of select layers in Intel's Core Ultra Series 3 processors, known as Panther Lake, built on Intel 18A. Intel said it has championed a large-mask initiative for more than three years. "Intel Foundry is focused on near term enablement of High NA on 6-inch masks," Naga Chandrasekaran, executive vice president and co-general manager of Intel Foundry, said, adding that the company is making the transition to 6x12-inch masks.

Samsung, meanwhile, said it plans to introduce High-NA EUV into future DRAM high-volume Manufacturing by 2028, which it described as the industry's first use of the technology for DRAM. With TSMC, Intel and Samsung now all committed to the larger format, the transition has support from every major producer of leading-edge logic chips.

ASML's Financial Momentum Heading Into Q3

The mask news comes as ASML's Business is strengthening. In its second-quarter results, released July 15, 2026, the company reported net sales of €9.3 billion, a gross Margin of 54.0% and Net Income of €2.9 billion, or €7.59 per share. It repurchased €1.1 billion of shares in the quarter and declared an Interim Dividend of €1.88 per share.

For the third quarter, ASML guided to net sales of €11 billion to €12 billion with a gross margin of 55% to 57%. For full-year 2026 it now expects net sales of €43 billion to €45 billion and a gross margin of 54% to 56%, well above the €34 billion to €39 billion range it gave in January, after two upgrades during the year. "AI-related investments are driving Demand for advanced Logic and Memory chips," Chief Executive Christophe Fouquet said in the Q2 release.

ASML also said it plans to increase capacity for low-NA EUV and DUV immersion systems by 30% in 2027 and is studying similar increases for 2028. ASML has capacity for at least 80 EUV systems in 2027, which is nearly sold out, and is examining ways to build more than 110 in 2028.

Competitive Position and Market Reaction

ASML remains the only supplier of EUV lithography systems, a position the larger-mask initiative is likely to reinforce, since the new format is being designed around its High-NA platform. That strength shows in the share price. ASML's US-listed shares closed at $1,747.90 on Sept. 22, up 2.14% on the day, giving it a market value of about $662 billion. The stock was up about 60% in 2026.

No separate share-price reaction specifically tied to the photomask announcement was clearly identifiable. Sector-wide semiconductor gains, capacity expansion news and rising AI demand have all played a part in the stock's strength this year.

Risks and Open Questions

The new mask push also brings execution and timing risks.

  • Long transition period: Ecosystem-wide changes to mask infrastructure typically take many years. Until they are complete, High-NA users must rely on stitching or smaller fields.
  • Ecosystem readiness: Suppliers of mask blanks, mask writers and inspection tools must invest in new equipment and standards, and delays at any stage could slow adoption.
  • Capacity execution: Scaling EUV output above 110 systems in 2028 without hurting margins or quality is a major manufacturing challenge.
  • Valuation: Shares trade about 34% above one internal fair-value estimate, suggesting strong future execution is already priced in.
  • Geopolitics: Export restrictions on sales to China remain a risk, and Chinese chipmakers are reportedly making progress on 3-nanometer chips without advanced lithography tools.

The October Earnings Checkpoint

ASML reports third-quarter results on Oct. 14, 2026. Investors will look at whether sales land within the €11 billion to €12 billion range, at order intake and at any early view on 2027 demand. Management commentary on High-NA shipments, customer adoption and the timeline for the large-format mask transition will be important. Further out, Samsung's plan to use High-NA in DRAM by 2028 and ASML's Capital Markets Day on June 10, 2027, are the next major milestones for the long-term High-NA story.