TSMC Delays 2027 CoWoS Packaging Tool Orders: ONTO, VECO Exposed

On September 1, 2026, DIGITIMES reported that TSMC has delayed placing its 2027 advanced packaging equipment orders. The gap lands first on back-end toolmakers' 2027 revenue, not on TSMC's own income statement.[1]

The report was published at 11:38 Taipei time. Its body is paywalled; the free preview says the delay has sparked speculation that TSMC sees excess CoWoS capacity ahead.[1] It is a single supply-chain report, not a company disclosure. As recently as August 18, a separate report described TSMC's CoWoS capacity as oversubscribed.[5]

What advanced packaging equipment is, and how it is bought

After a chip is fabricated it still has to be packaged. AI chips use advanced packaging: the logic die and high-bandwidth memory sit side by side on a silicon interposer and are sealed together. TSMC's version of this process is called CoWoS.

That step needs a full line of dedicated tools — wafer grinders and dicers, bonders, moulding systems, and the wet-processing, lithography and metrology tools that sit beside them.[4] These tools take three to four quarters from order to delivery, so a machine needed in 2027 has to be ordered in the second half of 2026.

Where a missing year of orders lands

TSMC is the largest buyer in a packaging-equipment market SEMI sizes at roughly $10 billion a year. An order it does not place in 2H26 removes 2027 revenue from the toolmaker; for TSMC itself it is a 2027 capital-spending saving.[4][6]

There are two readings. CoPoS, named in the headline, is an alternative approach that replaces round wafers with square panels, with volume ramp placed in 2028-29. If spending is simply moving to it, total packaging capex is unchanged but 2027 wafer-format tools still see an air pocket. If capacity has genuinely run ahead of demand, the gap is more than a timing difference — TrendForce reported in June that the CoWoS supply-demand gap had already narrowed from about 20% to about 10%.[2][3]

One step sideways: if TSMC's own capacity is ample, the overflow that pushed AI packaging out to the OSATs shrinks. Amkor (AMKR) has said its Arizona Phase 1 will dilute operating margin by 1 to 2 points starting in 2027.[9] And OSAT and foundry back-end capex is the order book of the equipment suppliers one step further out.

On September 1, the companies that sell these machines directly were sold: Disco (6146.T) fell 2.63% and Towa (6315.T) fell 2.74% against a Nikkei 225 down 0.15%; TSMC (TSM) fell 0.32%.[10]

Companies that may be affected

Onto Innovation (ONTO) makes semiconductor inspection and metrology tools and sits at the link where back-end capex sets equipment orders. On its Q2 2026 earnings call the company disclosed more than $200 million of orders from a single OSAT customer, the majority for 2027 delivery, inside a record $1.1 billion backlog.[7]

If that $200 million-plus order slipped a full year, at the Q2 gross margin of 53.4% it is roughly $107 million of gross profit — more than 40% of an estimated $250 million of annualized 2026 operating income. That could pressure results, though it depends on whether the delivery dates actually change.[7][12] ONTO fell 4.06% on September 1.[11]

Veeco Instruments (VECO) makes wet-processing and lithography tools, the same link but with more concentrated exposure. It booked $200 million of advanced-packaging orders in the second quarter, which management said are principally for 2027 delivery — about a quarter of its 2026 revenue guidance. The company has also already spent roughly $10 million of operating expense and about 75 basis points of gross margin in 2026 to more than double that capacity for 2027.[8]

The money is spent first. If half of that order book slips a year, roughly $100 million of revenue at about a 41% gross margin is about $41 million of gross profit, close to a third of the company's 2026 non-GAAP net income guidance. What would be revised down first is gross margin and expense, not revenue.[8] One caveat on where the exposure lands: Veeco is merging into Axcelis at 0.3575 Axcelis shares per Veeco share, pending Chinese regulatory clearance.[13]

What would confirm or break the chain

Start by looking for a second source. As of September 1 this is still a single-source report; if no one else puts numbers on which tool classes slipped and by how much within a fortnight, that usually means it did not happen.[1] Then the calendar: OSAT third-quarter results in late October, for whether capex guidance is cut; and Onto's third-quarter report in early November, for whether the $1.1 billion backlog and the 2027 delivery language on that order still hold.[7][9]

Three things would break the chain. First, TSMC places the orders in the fourth quarter, or the parties involved publicly deny the report.[1] Second, a format switch with no change in the total: Onto has said the process control it supplies for CoWoS is being carried over to CoPoS, and Veeco has said it is engaged with a Tier 1 foundry on panel processing — in which case the sign on both names is backwards.[7][8] Third, the real driver is HBM rather than CoWoS: Towa's (6315.T) near-monopoly is in HBM moulding, not TSMC's line.[7]

Sources

[1] DIGITIMES, "TSMC delays CoWoS orders as CoPoS plans take shape" · 2026-09-01 · news (body paywalled) · https://www.digitimes.com/news/a20260901PD219/tsmc-cowos-equipment-packaging-capacity.html

[2] TrendForce, "TSMC advances panel-level packaging; CoPoS pilot line reportedly set for June completion, 2028-29 ramp eyed" · 2026-04-13 · news · https://www.trendforce.com/news/2026/04/13/news-tsmc-advances-panel-level-packaging-copos-pilot-line-reportedly-set-for-june-completion-2028-29-ramp-eyed/

[3] TrendForce, "TSMC CoWoS supply-demand gap reportedly seen narrowing from 20% to 10% by end-2026" · 2026-06-15 · news · https://www.trendforce.com/news/2026/06/15/news-tsmc-cowos-supply-demand-gap-reportedly-seen-narrowing-from-20-to-10-by-end-2026-as-capacity-expands/

[4] ANI, quoting SEMI's Clark Tseng on wafer-fab, test and packaging equipment market size · 2026-09-01 · news · https://aninews.in/news/business/global-chip-market-to-exceed-2-trillion-by-2030-semi20260901124039/

[5] money.udn.com — TSMC CoWoS capacity oversubscribed, back-end orders spilling over to Intel's Malaysia plant · 2026-08-18 · news · https://money.udn.com/money/story/5612/9699916

[6] Zacks, "TSMC commits higher capex in 2026 while raising dividend payouts" · 2026-08-21 · news · https://www.zacks.com/stock/news/2978512/tsmc-commits-higher-capex-in-2026-while-raising-dividend-payouts

[7] Onto Innovation (ONTO) Q2 2026 earnings call · 2026-08-06

[8] Veeco Instruments (VECO) Q2 2026 earnings call · 2026-08-05

[9] Amkor Technology (AMKR) Q1 and Q2 2026 earnings calls · 2026-04-27 / 2026-07-27

[10] drillr price_volume_history — daily closes and change percent, 2026-08-24 to 2026-09-01 · market data

[11] drillr company_snapshot — market capitalization and trailing returns as of 2026-09-01 · market data

[12] drillr financial_statements — annual and quarterly revenue, gross profit and operating income · financial data

[13] Investing.com, "Axcelis and Veeco to merge in all-stock deal worth $4.4 billion" · 2026-02-06 · news · https://www.investing.com/news/company-news/axcelis-and-veeco-to-merge-in-allstock-deal-worth-44-billion-93CH-4265971