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Nittobo (TSE: 3110) ticker bar: TSE: 3110 30.4× FY3/27 guided EPS, Electronic Materials margin 48.2 percent, 48 percent below May’s closing high JPY 3,335 market cap ~JPY 607bn, 182.0m shares, close 1 Oct 2026 node L1.7.7, IC packaging substrates, glass cloth

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Our call: HOLD. New money: don’t open a position. Holders: sell; this turns to trim at a beta of 1.31 or below.

In 60 seconds

What Nittobo does

It is a Japanese glass-fibre company from Fukushima, founded in 1923 as a textile spinner. It melts glass, draws it into filaments finer than a hair, spins them into yarn and weaves the yarn into cloth. One grade of that cloth, T-glass, forms the core of the substrate under almost every large AI chip, because it stays flat when the chip heats up. Nittobo is the only company we have verified making the thinnest grades at volume from its own yarn.

A roll of Nittobo glass cloth, a fine translucent fabric, with the Nittobo label on it.

Nittobo glass cloth on the roll. Photo: Nittobo (nittobo.co.jp).

Where Nittobo sits: the glass cloth in the substrate core

Cross-section of an AI chip package: the silicon die on top, build-up wiring layers of film with no cloth, a core of glass-cloth laminate, more build-up layers, solder joints and the circuit board. Notes: the substrate grows from about 80 by 80 to 100 by 100 millimetres in 2026; E-glass expands 5.6 and T-glass 2.8 parts per million per degree, against about 3 for silicon.

The substrate under almost every large AI chip has a core of resin-soaked glass cloth. The cloth holds the resin back from expanding with heat; the lower its own expansion, the flatter a large package stays. Source: Nittobo product data; Commercial Times (9 Nov 2025). Schematic by chokepoints.ai, not to scale.

Why it matters now

Since 2024 the substrate makers behind AI chips have been short of that cloth. Nittobo’s Electronic Materials margin rose from 18.0% to ◆ 48.2%, and the shares rose from JPY 1,284 on 1 Oct 2025 to a closing peak of JPY 6,390 on 7 May 2026, then fell back to ◆ JPY 3,335 on 1 Oct 2026. At that price you are paying for the shortage to last a decade. We expect it to ease from early 2027, so we hold and would buy at JPY 1,400 to 2,150.

Four reasons

  1. Nittobo makes the cloth large AI packages need. In 2026 we found no rival verified making the thinnest grades at volume from its own yarn.

  2. The shortage already shows in the accounts. Electronic Materials earned 93% of FY3/26 operating profit, helped by price rises that Nittobo says it will not repeat this year.

  3. Relief starts in early 2027, in steps. Nittobo’s own Fukushima building makes its first output in ◆ January to March 2027 and ramps T-glass through FY3/28. Ibiden, the Japanese substrate maker whose customers include Nvidia, now counts ◆ four qualified cloth suppliers where it had two.

  4. The price needs the shortage to last. At ◆ JPY 3,335 and our 9.2% discount rate, Electronic Materials sales must grow 22.4% a year to FY3/36, and all five of our futures sit below the price. Only 3 to 7% of our 20,000 simulated paths get there, depending on the specification.

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The signal on Nittobo, Hold, medium conviction: The signal Hold Conviction Medium JPY 3,335 pays for ten more years of today’s cloth shortage. We think it ends in 2027: Nittobo’s own new plant starts up, and a leading AI-substrate maker downstream of it, Ibiden, already has four qualified suppliers. We would buy at JPY 1,400 to 2,150. The gap: the JPY 1,446 weighted value sits 57% below JPY 3,335. The Electronic Materials margin is ◆ 48.2 percent, against 18.0 percent in FY3/24. Across five specifications, 3 to 7% of 20,000 model paths end above spot. Five futures, each flexing a different driver, valued at a 9.2 percent WACC (our discount rate, the weighted average cost of capital) against the 1 Oct close of JPY 3,335: Future Value vs spot (JPY 3,335) Weight Structural supercycle JPY 3,047 −9% 7% Toll road holds JPY 2,189 −34% 18% Cycle bust FY3/29-30 JPY 1,460 −56% 17% Second sources s

Basis: eight kessan tanshin (Japanese earnings releases) and company notices, read against the filing text. 237 public facts, with 40 load-bearing claims re-checked against a second source: 26 confirmed, 5 disputed, 5 refuted, 4 outdated. UN Comtrade and MOPS series, and a five-future DCF with a 20,000-path Monte Carlo. Facts as of 28 to 29 September 2026; prices at the 1 October 2026 close. Values marked with a red diamond, like ◆ this, change over time and move our view; each has a row in the Watch variables appendix.

01 The question

The question is whether Nittobo holds a lasting toll on AI hardware or a head start that its own new capacity and three or four rivals close by 2028. We think it is the head start; the price assumes the toll. The schematic near the top shows where the cloth sits.

For two years substrate makers have sent executives to Fukushima to ask for more cloth, and most have gone home without it. Nitto Boseki, which trades as Nittobo on the Tokyo exchange under code 3110, is worth JPY 607bn at ◆ JPY 3,335, its close on 1 October 2026.

02 What T-glass cloth is

T-glass cloth matters because it keeps a large AI package flat as the chip heats up.

Glass cloth is a fabric woven from glass yarn. Each yarn is a bundle of glass filaments thinner than a human hair, and the cloth looks like fine grey muslin. Laminate makers soak it in resin and press it between copper foils to make the board material that almost every circuit board and chip substrate starts from.

An AI accelerator such as an Nvidia GPU or a Google TPU does not sit straight on a motherboard. It sits on a package substrate, a small multi-layer board that fans thousands of fine connections out to the coarser board below. The substrate has a stiff core of glass-cloth laminate, with wiring layers built up on each side from Ajinomoto’s build-up film (ABF), which contains no cloth (Ajinomoto product literature). In a conventional ABF substrate, only the core has cloth.

The core’s job is to stop the package bending as it heats. Materials grow as they warm, and engineers measure the growth as the coefficient of thermal expansion, or CTE: the millionths of its length a material gains per degree. Silicon expands about 3 parts per million per degree. The resin in a substrate core expands far more, and the glass cloth holds it back, so a core built on ordinary cloth still grows several times faster than silicon.

Heat the two together in a solder oven, then again in a data centre, and the package bows and solder joints crack. Engineers call this warpage, and it gets worse as the package gets bigger (Exhibit 1).

Horizontal bars of thermal expansion in parts per million per degree: substrate core with ordinary glass cloth 12 to 17, E-glass fibre 5.6, silicon chip 2.6 to 3.2, T-glass fibre 2.8, Vlex 2.0.

Exhibit 1. Thermal expansion of the materials in a package. T-glass sits within 0.1 parts per million of silicon; a core made with ordinary cloth expands four to six times faster than the chip. Source: Nittobo property table; insidedeeptech (19 Aug 2026); Nikkei via TrendForce (4 Feb 2026). Chokepoints analysis. Chart by chokepoints.ai.

AI packages are getting bigger. New AI chip substrates grew from about 80 by 80 millimetres to 100 by 100 in 2026 (Commercial Times, 9 Nov 2025), and Nvidia’s Rubin substrate is larger again, with more layers (TrendForce, 30 Apr 2026). The bigger the package, the more a small expansion mismatch costs in failed parts.

T-glass is Nittobo’s answer. Ordinary electronic E-glass expands 5.6 parts per million per degree; T-glass expands 2.8, close to silicon, and it is stiffer, at 86 GPa of tensile modulus against 75 (Nittobo property table).

The difference is chemistry: T-glass is 64 to 66% silica, 24 to 26% alumina and 9 to 11% magnesia, with none of the calcium oxide or boron that make E-glass easy to melt. E-glass carries 20 to 25% calcium oxide and only 52 to 56% silica (Nittobo).

The same chemistry makes T-glass hard to produce. Furnaces melt glass fibre above 1,300°C and draw it through platinum-alloy bushings that need precise temperature control (Nittobo); T-glass runs at 1,600 to 1,700°C in dedicated electric furnaces (Postation, 24 Sep 2026).

Molten glass this rich in silica is stiff and hard to draw, and the filaments have to come out uniform enough to weave the thinnest cloths without breaks. Nittobo’s thinnest catalogue cloth, style 1010, is 13 micrometres thick, about an eighth of a sheet of office paper (Nittobo product table). Nittobo weaves the yarn on looms and finishes the cloth before it ships to the laminate makers.

A second special glass sells into the same boom. NE-glass and its successor NER-glass have a lower dielectric constant than E-glass, so they slow and smear fast signals less (Nittobo). These go into the server and switch boards that carry 112 Gbps links rather than into chip packages.

The scramble reached the general press in January 2026, when Nikkei Asia reported Apple competing with Nvidia, Google and Amazon for Nittobo’s cloth (14 Jan 2026). Trade press had reported seven months earlier that senior executives from Nvidia, AMD and Microsoft were visiting Nittobo to secure T-glass (DigiTimes, 27 Jun 2025); Nittobo has not confirmed any visit.

Hiroki Kajikawa, a senior executive officer, told Toyo Keizai that Nittobo sells only to laminate makers and used to have no direct dialogue with the chip companies; that, he said, had changed dramatically (21 Aug 2026).

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03 Nittobo in brief

Nittobo reports six segments, and Electronic Materials earns almost all the profit.

In FY3/26, the year to March 2026, the group sold JPY 118.2bn and earned JPY 20.8bn of operating profit, with 2,793 employees at 31 March 2026 (FY3/26 tanshin; company site).

Electronic Materials

Glass yarn and cloth for circuit boards and chip substrates, the subject of this note. Sales JPY 49.3bn, operating profit JPY 19.4bn, 93% of the group total.

The other five segments

The other five segments earned JPY 3.6bn between them before JPY 2.2bn of corporate costs and eliminations.

Nittobo's other five segments, FY3/26 sales: Segment FY3/26 sales Glass-wool building insulation JPY 15.1bn Clinical diagnostic reagents JPY 13.9bn Composites: glass-fibre reinforcement for aerospace, transport and sports goods, where T-glass began JPY 13.4bn Materials and chemicals JPY 9.5bn Other businesses JPY 17.1bn

Source: FY3/26 kessan tanshin, segment note.

History

  • 1923. Formed in Fukushima from two silk spinners, one of them a Koriyama mill dating to 1898 (Nittobo).

  • 1938. Industrialised glass fibre at about the same time as Owens-Corning in the United States; both claim a world first (Nittobo history page).

  • 1990s. NE-glass arrives and becomes the industry’s de facto low-dielectric standard (Nittobo).

  • T-glass. It began in the composites business as a reinforcement for aerospace and sports parts, then moved into package substrates.

Nittobo history timeline, 1898 to 2026: 1898, 1923 Koriyama silk mill founded; Nitto Boseki formed from two Fukushima spinners 1938 Industrialises glass fibre, alongside Owens-Corning 1988 Taiwan yarn joint venture, forerunner of NITTOBO ASIA Glass Fiber in Chiayi 2018 to 2019 Buys 47.65% of Baotek, a Taoyuan weaver, and consolidates it 2023 to 2024 Low-dielectric cloth demand surges on AI switch boards from summer 2023; T-glass for packages from 2024 Aug 2025 Board approves a JPY 15bn cloth building at Fukushima, up to about 3x leading-logic output Nov 2025 Sells Tokyo Yaesu land to Sumitomo Realty for a JPY 34.2bn gain; Nan Ya weaving pact Apr 2026 Hisanobu Hayashi becomes CEO Jul to Sep 2026 5-for-1 split (1 Jul); FTSE All-World inclusion (21 Sep)

Sources: Nittobo company history and TDnet filings; Nikkei (19 Apr 2019) for Baotek; TDnet 29 Aug 2025 and 6 Nov 2025.

Fiscal years: Nittobo labels them by the calendar year they start in, so the company’s FY2027 is our FY3/28, the year to March 2028.

Plants

The Fukushima Enterprise Center makes yarn and cloth, and all of the T-glass cloth for leading-edge logic comes from one building there, the former Fukushima No.2 plant (Nikkan Kogyo Shimbun, 30 Sep 2025).

In Taiwan, NITTOBO ASIA Glass Fiber melts and draws yarn in Chiayi. Baotek, listed in Taipei as Chien Jung, weaves in Taoyuan from group yarn and plans T-glass cloth mass production in FY3/28, with Nan Ya collaborating on weaving (Nittobo, Q1 FY3/27 results briefing, 5 Aug 2026).

The new building

17,212 square metres on the Fukushima site, under construction since October 2025, due for completion in December 2026, first output in January to March 2027 (TDnet, 29 Aug 2025). T-glass mass manufacturing there ramps through FY3/28 (Nittobo, Q1 FY3/27 results briefing, 5 Aug 2026), so the relief arrives in steps.

Management

Hisanobu Hayashi became president on 1 April 2026 after running the Electronic Materials division and, before that, NITTOBO ASIA; he joined in 2013 and holds 899 shares (TDnet, 24 Dec 2025).

The board said it promoted him because the business was changing faster than the mid-term plan had assumed. Nittobo hit the plan’s final-year operating-profit target of JPY 20bn two years early, and the board raised it to JPY 36bn in May 2026.

04 The bottleneck is the yarn

The scarce step is the yarn, and Nittobo’s own spending shows it (Exhibit 2). The JPY 15bn Fukushima building buys weaving and finishing.

The yarn is a separate, slower programme, in four steps:

  1. In 2024 Nittobo decided to build yarn furnaces in Taiwan because its Japanese sites had no room for another (Nikkei, via TrendForce, 4 Feb 2026).

  2. It keeps adding them there from the second half of 2026 (Denshi Device Sangyo Shimbun, 17 Oct 2025).

  3. It installs new T-glass melting furnaces in Chiayi in FY3/27 while scaling down commodity E-glass (Nittobo, Q1 FY3/27 results briefing, 5 Aug 2026).

  4. It reaches twice the mid-term-plan yarn capacity by FY3/28 (company materials, via Postation, 21 Sep 2026).

A furnace runs continuously once lit, and adding one takes about two years.

Left: two boxes comparing the JPY 15bn loom building (weaving and finishing, about 3x cloth, producing January to March 2027) with the furnace programme (new T-glass furnaces in Chiayi, more Taiwan furnaces from H2 2026, yarn 2x by FY3/28, about two years from approval to output). Right: three hurdles for a rival, a low-expansion recipe, drawing fine filaments at a paying yield, and qualification at laminate maker, substrate maker and chip designer, with a loop arrow showing that failure at step 3 sends the entrant back to step 1.

Exhibit 2. Why the yarn is the bottleneck. Nittobo’s capex splits into a fast loom programme and a slow furnace programme. A rival needs a low-expansion recipe, a furnace that draws it at a paying yield, and approval from three tiers of customer; a failure at the last step sends it back to the first. Source: TDnet (29 Aug 2025); Nittobo Q1 FY3/27 briefing (5 Aug 2026); Nikkei via TrendForce (4 Feb 2026); Denshi Device Sangyo Shimbun (17 Oct 2025); Postation (21 Sep 2026). Chokepoints analysis. Chart by chokepoints.ai.

Customers say the same. “No extra capacity means no extra capacity. Pressuring Nittobo does no good,” a substrate-maker executive told Commercial Times; he expected relief only when new capacity opens in the second half of 2027 (16 Jan 2026).

Demand jumped from about May 2024, said Mikami, deputy head of the Electronic Materials division, and “honestly, our supply capacity is tight” (Denshi Device Sangyo Shimbun, 17 Oct 2025).

Market-share figures need care

  • T-glass. Nikkei, and TrendForce after it, put Nittobo at about 90% of T-glass. T-glass is Nittobo’s own brand, so this is close to a definition (TrendForce, 30 Apr 2026).

  • The wider market. In the wider market for high-end low-CTE cloth, Taiwan Glass’s chairman puts Nittobo above 50% and his own company at ◆ about 40% (Economic Daily News, 12 Jun 2026). That 40% is self-reported and has moved fast: in March 2025 he was aiming for 30% by year-end (Economic Daily News, 17 Mar 2025).

  • NER-glass. In second-generation low-dielectric NER-glass, TrendForce gives Nittobo 60 to 70%.

  • Nittobo itself. It publishes no share figure of its own.

Not known today

Which rivals, if any, make the thinnest low-CTE grades used in flagship GPU and ASIC substrate cores. Taiwan Glass has passed customer certification for a special-spec low-CTE cloth and started deliveries (Commercial Times, 11 May 2026). Fulltech’s low-CTE yarn has an overseas customer’s approval, but its cloth is still in certification (MoneyDJ, 2 Sep 2026). China’s Grace Fabric sells certified low-CTE cloth to laminate makers and had 5.0% of the market by 2025 revenue (Hong Kong listing filing, May 2026). Nan Ya weaves for Nittobo rather than against it. No rival was verified at volume in the thinnest grades on its own yarn, and no source names the grades each has qualified.

Both halves of the bottleneck wear down: a rival can buy a furnace, and qualifications come with time. Today’s margin is what Nittobo has to lose when they do.

05 Where the 48% margin comes from

Electronic Materials went from an 18% margin to a 48% margin in three years. Segment sales rose 65% between FY3/24 and FY3/26 while its operating profit rose 3.6 times, and the first quarter of FY3/27 printed a ◆ 48.2% margin on sales up ◆ 29.5% (Exhibit 3).

Electronic Materials: full years and the segment margin

Left: Electronic Materials sales of 29.9, 40.9 and 49.3 billion yen in FY3/24 to FY3/26, with operating profit of 5.4, 13.9 and 19.4 billion. Right: the segment margin at 18.0, 33.9 and 39.4 percent for the three years, 36.7 percent in Q1 FY3/26 and 48.2 percent in Q1 FY3/27.

Exhibit 3. Electronic Materials sales, operating profit and margin. FY3/24 is restated to the current six-segment structure. Source: Nittobo kessan tanshin, 9 May 2025, 12 May 2026, 5 Aug 2026 (FY3/24 restated to the six-segment structure). Chokepoints analysis. Chart by chokepoints.ai.

Nittobo Electronic Materials segment, sales, operating profit and margin: JPY bn FY3/24 FY3/25 FY3/26 Q1 FY3/26 Q1 FY3/27 Segment sales 29.9 40.9 49.3 11.3 14.6 Segment operating profit 5.4 13.9 19.4 4.1 7.0 Operating margin 18.0% 33.9% 39.4% 36.7% 48.2% Share of group OP 64% 84% 93% 96% 89%

Source: kessan tanshin 9 May 2025, 12 May 2026, 5 Aug 2026; share of group OP is segment OP over consolidated OP. Chokepoints analysis. Margins are on external sales, the tanshin basis; on sales including intersegment transfers, Nittobo put the Q1 FY3/27 margin at 38.9%, against 28.8% a year earlier (company materials, via Postation, 21 Sep 2026). Our thresholds use the external basis.

Three margin drivers:

  • Price rises. Nittobo does not disclose their size. Commercial Times, via TrendForce, reported about 20% on electronic-grade glass fibre in 2025 and about 30% on T-glass in 2026 (30 Jun 2026). Nittobo’s own notice covered only composites, 20% from 1 August 2025 (Nittobo, 2 Jun 2025). The Q1 tanshin and the August deck credit price revisions, mainly on special glass, with part of the gain.

  • A full plant selling more of its best grades. Nittobo’s index of special-glass sales, with FY3/16 on a half-yearly basis set at 100, reached 658 in the second half of FY3/25, 736 in the first half of FY3/26 and 802 in the second (Nittobo, Q1 FY3/27 results briefing, 5 Aug 2026). The deck’s FY3/27 forecast bars carry no labels; read from the chart, they sit at about 1,000 and 1,130. Hayashi told the 5 August briefing that production and sales of special glass were both running strong (briefing transcript, BigGo, 5 Aug 2026).

  • Customers can absorb the price. T-glass is about 15 to 20% of the cost of a BT substrate, the resin board used mostly for memory and mobile chips, and 5 to 10% of an ABF substrate (Commercial Times, 28 Oct 2025), a small part of what the customer buys.

The rises have stopped, by Nittobo’s own account: in May it had ◆ no further T-glass price revision planned and would not raise prices on supply and demand; in August it said it would look at price again once it could supply more, and that NER-glass would not rise this year (company Q&A, via Postation, 21 Sep 2026).

Japan’s trade data show the same shift. Exports of woven glass cloth to Taiwan, the main substrate hub, averaged USD 252 per kg in January to July 2026, up from USD 92 in 2022. Tonnage fell from 302 tonnes in 2022 to 166 in 2025 and 100 in the first seven months of 2026 (Exhibit 4).

The customs code mixes commodity and special cloth, so read the unit value as a mix signal rather than a T-glass price: a thin special grade weighs less per square metre, so a richer mix lifts it with no change in any price. In the same seven months Japan’s cloth fetched USD 32 per kg in Thailand and USD 289 in Korea.

Less glass is leaving Japan, at far more value per kilogram. It cannot show what any given cloth now costs.

Japan’s woven glass-cloth exports: less weight, far more value

Bars of Japan's woven glass-cloth exports to Taiwan falling from 302 tonnes in 2022 to 100 tonnes in January to July 2026, while the unit value rises from 92 to 252 dollars a kilogram; Korea's unit value runs from 177 to 289 dollars.

Exhibit 4. Japan HS 701963 exports. Taiwan: 302 t at USD 92/kg (2022), 207 t at 105 (2023), 208 t at 133 (2024), 166 t at 194 (2025), 100 t at 252 (Jan to Jul 2026). Korea: USD 177, 231, 258, 235, 289 per kg. Source: UN Comtrade (HS2022 701963), Chokepoints analysis. The code mixes E-glass and special-glass cloth: unit value is a mix signal rather than a T-glass price. Chart by chokepoints.ai.

Nittobo does not name its customers. Its direct buyers are laminate makers, and the chip companies sit two or three steps away; Apple stationed staff at one laminate maker, Mitsubishi Gas Chemical, in autumn 2025 to secure substrate materials (Commercial Times, 16 Jan 2026).

We found ◆ no disclosed long-term agreement, prepayment or customer-funded capacity. The nearest thing is Nittobo’s statement in May that it would ask customers to share the cost of any capacity beyond the current plan (company Q&A, via Postation). The one long-term supply deal on record runs the other way: Nittobo sells Nan Ya NER yarn that it sells to no one else, and Nan Ya weaves about 20% of Nittobo’s cloth by 2027 (Nan Ya release and Anue, 28 Nov 2025).

Not known today

How much of Electronic Materials is special glass and how much is commodity E-glass. Nittobo discloses only the index. One outside yardstick: Frost & Sullivan, in Grace Fabric’s Hong Kong listing filing, sized the whole low-CTE cloth market at USD 128m in 2025. At Nittobo’s reported 50 to 90% share, that is JPY 10bn to 17bn of T-glass cloth, a fifth to a third of segment sales on our arithmetic. Our model assumes 70% special glass across NE, NER and T, so most of that 70% would be low-dielectric NE and NER cloth.

Three things distort the group numbers:

  • The land sale. FY3/26 net profit of JPY 41.8bn included a JPY 34.2bn gain on the Tokyo land sale. That is why FY3/27 guidance in May showed net profit falling 59%.

  • The August raise. Nittobo guided the operating line up in May and raised it again on 5 August: sales JPY 141bn, operating profit ◆ JPY 30bn, net profit JPY 20bn, EPS JPY 109.87 after the split. Electronic Materials supplied JPY 2.0bn of the JPY 4.0bn raise, lifting its own profit guide to ◆ JPY 28bn from JPY 26bn (Nittobo, Q1 FY3/27 results briefing, 5 Aug 2026); price rises in insulation and other general-purpose products supplied most of the rest. The guide puts second-half operating profit at JPY 14.7bn, below the first half’s JPY 15.3bn (kessan tanshin, 5 Aug 2026), with T-glass volume up about 20% for the year (company materials, via Postation, 21 Sep 2026).

  • The plan. FY3/28 targets are sales JPY 155bn and operating profit JPY 36bn. Four-year capex rose from about JPY 80bn to about JPY 120bn, with ◆ JPY 45bn planned for FY3/27 against JPY 21.7bn the year before.

The 48% came from a sold-out plant in a shortage. The valuation question is what happens to it when the plant triples and customers have four suppliers to call.

06 What the price assumes

A buyer at ◆ JPY 3,335 is paying for the shortage to last.

Nittobo trades at 30.4 times its own FY3/27 EPS guidance. The average sell-side target was JPY 4,532 on 1 October, down from JPY 4,690 on 29 September and JPY 5,451 at the end of June (minkabu, 1 Oct 2026).

To justify JPY 3,335 at a 9.2% discount rate, our model needs one of two things:

  1. Electronic Materials sales compound at 22.4% a year for ten years, from JPY 49.3bn in FY3/26 to about JPY 373bn in FY3/36; or

  2. the segment holds a 63% margin from FY3/28 onward on the volumes we model.

In our view the shortage is temporary and the yarn know-how is what lasts. Four facts put a date on the shortage:

  1. Nittobo is its own biggest competitor. Its Fukushima building has first output in ◆ January to March 2027 and ramps T-glass through FY3/28, and special-glass capacity reaches about three times FY3/26 by FY3/29 (TDnet, 29 Aug 2025; Nittobo, Q1 FY3/27 results briefing, 5 Aug 2026; company roadmap).

  2. The biggest buyers have more sellers. Ibiden, Japan’s largest package-substrate maker, now has ◆ four glass-cloth suppliers usable for volume where it had two, and a Japanese one adds capacity next fiscal year (Ibiden Q&A, 5 Aug 2026).

  3. New glass is on its way. Taiwan Glass guided high-end supply up 40 to 50% for 2026, and Nippon Electric Glass starts ◆ mass production in spring 2027 of a low-loss fibre that competes with NE-glass (Economic Daily News, 20 Nov 2025; Nikkei, 28 Aug 2026).

  4. Nittobo will not expand at the market’s pace. Its chief executive at the time told Nikkei Asia as much (22 Dec 2025). That protects margin and hands volume to rivals.

Even so, the business stays good in our numbers. Our toll-road future gives Nittobo the thinnest grades, a 95%-full tripled plant and a margin easing from 47% to 42%, against 18% before AI. That future is worth JPY 2,189. The price sits 52% above it.

Playing devil’s advocate

Hayashi said on 5 August that even the threefold expansion will not be enough (TrendForce, 6 Aug 2026), and management says it will invest beyond the plan if the opportunity is large (company Q&A, via Postation). A US broker still sees glass cloth about ◆ 30% short in 2028 (Postation, 15 Sep 2026). If Vlex, the next-generation low-CTE glass, becomes the standard from 2028, the lead renews. We give that world a 7% weight and value it at JPY 3,047, still 9% below spot.

Not known today

Who Ibiden’s third and fourth suppliers are, which Japanese supplier is expanding, and whether the newcomers are qualified for ABF core cloth in leading-logic packages or only for BT and thicker grades. Ibiden names no one. In October 2025 it said it had qualified one alternative supplier but still worried about that supplier’s capacity (Ibiden Q&A, 31 Oct 2025). The expanding Japanese supplier is most plausibly Nittobo itself, whose Fukushima and Taoyuan lines ramp through Ibiden’s next fiscal year. Nippon Electric Glass fits the timing, but its new fibre is a low-loss board grade rather than low-CTE. Neither is confirmed. Taiwan Glass is the best-supported newcomer, but its Ibiden and Resonac certification exists only as market talk (Economic Daily News, 16 Apr 2026). Asahi Kasei entered in April 2026 with quartz cloth, a different material (Nikkei, 1 Apr 2026). If the Taiwanese incumbent is Nittobo’s own Baotek, the count is less independent than it reads.

07 What would prove us wrong

We are wrong if Nittobo’s lead lasts. Two signs would show it, and either would change our call:

  1. Margin stays above 60% of external sales, about 48% including intersegment sales, for two quarters after the Fukushima plant ramps up. That would mean Nittobo held its prices while tripling volume.

  2. Only Nittobo makes the thinnest grades after 2028, because its next glass, Vlex, becomes the standard and no rival gets approved alongside it.

The second depends on Vlex. It expands about 30% less than T-glass, 2.0 parts per million per degree against 2.8 (Nikkei, via TrendForce, 4 Feb 2026; Exhibit 1), and Nittobo’s own deck adds lower signal loss.

Development is finished and samples are with laminate makers (Denshi Device Sangyo Shimbun, 17 Oct 2025). The roadmap puts the business at ◆ FY2028 onward, from April 2028 in Nittobo’s labelling (Nittobo, Q1 FY3/27 results briefing, 5 Aug 2026), while Nikkei reported practical use as early as calendar 2028. In February management said it would push Vlex to become the de facto standard against new entrants (company briefing, via Postation, 21 Sep 2026).

A lower discount rate softens the call for holders. Our line is sell while the price sits above every future we model, and trim once one future clears it. Beta, how far the shares swing with the market, sets the discount rate.

At 8.6%, our low case with a beta of 1.30, the weighted value is JPY 1,566. The supercycle future, at JPY 3,377, then clears the price by about 1%, so the holders’ line becomes trim. The switch comes at a beta of 1.31, within one standard error of our 1.42 estimate, so the line between sell and trim is thin. The weighted value reaches the price only at a WACC of 5.0%.

Not known today

Whether Vlex needs a fresh qualification at each substrate maker or rides on existing T-glass approvals. No source says. The same logic cuts against Nittobo today: an approval a customer grants a rival during the shortage survives Nittobo’s expansion (Postation, 21 Sep 2026). If Vlex needs fresh approval, rivals get a chance to qualify alongside it in 2028.

08 What JPY 3,335 already demands

What the price needs: the supercycle’s volumes with FY3/29 prices and margins held to about FY3/34, scarcity economics lasting about eight years longer than in any of the eight past component shortages we checked: MLCCs, silicon wafers, copper foil and DRAM in 2016 to 2019, glass cloth in 2016 to 2018 and 2020 to 2022, and ABF film and chips in 2020 to 2023. Held all the way to FY3/36, the same construction is worth JPY 3,633, 9% above spot.

The reverse DCF keeps our toll-road assumptions and asks what one number would have to change to justify the price.

What JPY 3,335 already demands, implied versus our toll-road case: At JPY 3,335, the market needs Implied Our toll-road case Gap EM sales growth, FY3/26 to FY3/36, a year 22.4% 11.1% 2.0× the rate EM sales in FY3/36, JPY bn 373 141 2.7× Flat EM margin from FY3/28, toll-road volumes 63% 44% average +19 pp Supercycle capacity growth to reach spot 1.18× 1.00× +18% Supercycle margin uplift to reach spot +3.7 pp 0 +3.7 pp

Source: Chokepoints valuation model v4.1 (29 Sep 2026), spot at the 1 Oct 2026 close; WACC 9.2%. The growth rate needed rises with the discount rate: 20.2% at 8.6%, 26.5% at 10.2%. No mix of our five futures reaches the price: spot sits above all of them.

The earnings multiples say the same. The price is 30.4 times FY3/27 guided EPS of JPY 109.87, 22.3 times our toll-road FY3/28 EPS of JPY 149.8 and 17.1 times our toll-road FY3/29 EPS of JPY 195.0.

The last multiple looks cheap until you see what FY3/29 is in our model: the year the new capacity ramps in, running 95% full at a 46% margin, and the peak of EM growth. After FY3/30 our toll-road sales grow about 2% a year on average and the margin drifts to 42%. Paying 17.1 times peak-year earnings only works if profits keep rising after the new capacity lands.

Our toll road sits on consensus operating profit to FY3/29, year by year: JPY 31.6bn, 40.7bn and 52.9bn in our model, against 31.6bn, 40.6bn and 52.9bn from the sell side (MarketScreener, 29 Sep 2026). FY3/27 consensus EPS rose from JPY 108.03 on 1 July to JPY 118.26 (minkabu, 29 Sep 2026), against our JPY 116.4. For FY3/28 the sell side expects sales of JPY 166.0bn (S&P Global, via StockAnalysis), above the plan’s JPY 155bn and our JPY 157.6bn.

Our disagreement with the sell side starts after FY3/29. Even on the toll road, the gap to the price is the fade after that year and the discount rate: on that path spot implies a 6.9% WACC, against our 9.2%.

Our method has leaned low before. Run on the information of 29 September 2025, it would have put FY3/27 operating profit about 30% below the JPY 30bn now guided, because it allowed no further price rise while the shortage was a year old.

The young-shortage rule we now apply, one more price step while a shortage is under about two years old, brings that backtest within 3%. This shortage is about 2.75 years old and Nittobo plans no further T-glass rise, so the rule adds nothing today.

09 Five futures, five drivers

Weighted across five futures, Nittobo is worth JPY 1,446 a share at our 9.2% WACC, and no weighting of them reaches the price.

Each future flexes a different named driver, so the weights estimate which driver wins. Each weight starts from a base rate, how often that outcome happened in a class of past cases coded on the outcome the future describes, and is then updated for 16 dated evidence items.

Glass-core substitution carries the largest weight, 39%: in 13 past packaging-material transitions, the new technology displaced the incumbent in flagship packages within about five years of its first pilot 39% of the time, and Intel’s glass-core pilot line dates from 2023.

The Monte Carlo varies capacity, price, utilisation, margin, the yen, the discount rate and terminal assumptions inside each future. One shared demand factor drives price, volume and capacity together, and the margin moves with price and volume.

Across 20,000 paths the median value is JPY 1,274 and the 90th percentile JPY 2,958. Between 3% and 7% of paths clear the price, depending on how wide and how correlated we make the shocks; that range measures how sensitive our model is to its own settings.

Each future’s central value sits below the price, but its paths spread around it: 42% of supercycle paths clear the price, 18% of toll-road paths and no more than 4% of any bear future’s.

Nittobo's five futures, driver, margin path, value and weight: Future Driver it flexes EM margin path Value, JPY Weight Structural supercycle Demand outruns the 3× build; Nittobo adds furnaces beyond the plan 48% to 44% 3,047 7% Toll road holds Nittobo keeps the thinnest grades; tripled plant 95% full 47% to 42% 2,189 18% Cycle bust FY3/29-30 Everyone’s capacity lands into a substrate inventory correction 26% trough, 37% 1,460 17% Second sources scale 2027-28 Newcomers climb into ABF leading-logic grades before Vlex 47% to 29% 1,096 19% Glass-core substitution Glass-core substrates take flagship packages from FY3/31 47% to 25% 997 39% Probability-weighted 1,446 100%

Source: Chokepoints valuation model v4.1 (29 Sep 2026), spot at the 1 Oct 2026 close; WACC 9.2%. Weights are base rates updated for evidence, as set out above, rounded to whole percentages.

No future we can evidence reaches the price

Horizontal bars of five futures valued at 3,047, 2,189, 1,460, 1,096 and 997 yen with weights of 7, 18, 17, 19 and 39 percent, a Monte Carlo band from 508 to 2,958 yen with a 1,274 median, a weighted value line at 1,446 and the spot line at 3,335, beyond every bar.

Exhibit 5. Values by future against spot. Monte Carlo, central specification: P10 JPY 508, P50 1,274, P90 2,958, mean 1,558; 3 to 7% of model paths above JPY 3,335 across five specifications. Source: Chokepoints valuation model v4.1 (29 Sep 2026), spot at the 1 Oct 2026 close, 20,000-path Monte Carlo. Chokepoints analysis. Chart by chokepoints.ai.

The discount rate is our second largest judgement after price. We build it in four steps:

  1. The 10-year JGB yield was ◆ 3.08% on 28 September (MOF).

  2. Japan’s A1 rating carries a 0.60% default spread in Damodaran’s January 2026 country data, and taking it out leaves a 2.48% risk-free rate.

  3. Nittobo’s two-year weekly beta against the Nikkei 225 is 1.63 raw, ◆ 1.42 after the standard Blume adjustment, with a standard error of 0.33.

  4. With Damodaran’s 5.14% equity risk premium for Japan, that gives a 9.8% cost of equity and a 9.2% WACC.

Our first version used the raw yield with a 5.5% premium, which counted part of Japan’s default risk twice, and got 10.2%. Each percentage point of WACC moves the weighted value by about JPY 173 to 225.

Exhibit 6 runs the weighted value across discount rates and terminal growth rates, the grid a fairness opinion shows. No cell reaches the price.

Weighted value by WACC and terminal growth: Weighted value, JPY 8.2% 8.6% low 8.7% 9.2% base 9.7% 10.2% v1 Terminal growth minus 1.0 pp 1,598 1,508 1,494 1,402 1,319 1,243 Terminal growth minus 0.5 pp 1,632 1,535 1,520 1,423 1,336 1,256 Terminal growth as modelled 1,671 1,566 1,550 1,446 1,354 1,270 Terminal growth plus 0.5 pp 1,715 1,601 1,584 1,472 1,374 1,285 Terminal growth plus 1.0 pp 1,769 1,643 1,624 1,503 1,397 1,303 Toll-road future 2,577 2,395 2,368 2,189 2,031 1,888 Reverse DCF: EM sales growth a year 18.6% 20.2% 20.5% 22.4% 24.4% 26.5% Supercycle weight to reach spot, rest on toll road 69% 96% none none none none EM margin reverts to 20% by FY3/36, all futures 1,201 1,137 1,127 1,062 1,004 951

Exhibit 6. Probability-weighted value by WACC and terminal growth; every cell sits below JPY 3,335. Low case: beta 1.30 (8.6%); v1: raw JGB and a 5.5% premium (10.2%). ’None’ means spot sits above every future at that rate. Reversion row: each future’s EM margin runs from its FY3/28 level to 20% by FY3/36 (FY3/24 was 18.0%), with volumes, prices and weights unchanged. Source: Chokepoints valuation model v4.1 (29 Sep 2026), spot at the 1 Oct 2026 close.

Exhibit 7 moves one driver at a time to the 10th and 90th percentile of its range, set from its own history where it has one, with the margin tied to price and volume through the segment’s fixed costs.

Price moves the value most: a price index 18% lower from FY3/28, with unit costs unchanged, takes the weighted value to JPY 794, and 18% higher takes it to JPY 2,098. The discount rate comes second. No driver at either end reaches the price.

Price moves the value most; nothing at the 90th percentile reaches spot

Tornado of the weighted value with each driver at its 10th and 90th percentile: price index 794 to 2,098 yen, WACC 1,232 to 1,748, utilisation 1,187 to 1,661, capacity 1,278 to 1,694, non-price margin 1,245 to 1,647, then growth capex, other-segment margin and tax; the base is 1,446 and the spot line at 3,335 lies beyond every bar.

Exhibit 7. Weighted value with each driver at its 10th and 90th percentile, all futures shocked together. Base JPY 1,446 at a 9.2% WACC. Source: Chokepoints valuation model v4.1 (29 Sep 2026), spot at the 1 Oct 2026 close. The margin moves with price and volume through a 40 percent fixed-cost share. Chokepoints analysis. Chart by chokepoints.ai.

JPY 1,062 is the weighted value if every future’s Electronic Materials margin reverts to a normal level, the last row of Exhibit 6. McKinsey’s method for cyclical companies bases the continuing value on a normal level of profit (Koller and Wessels, 21 Oct 2025), and our futures end FY3/36 at margins that weight to 32.1%.

In this check each future keeps its volumes and prices, and its margin runs in a straight line from the FY3/28 level to 20% by FY3/36, midway between the pre-AI 18.0% of FY3/24 and 22%. Across 18% to 22% the weighted value is JPY 1,005 to 1,119. Reverting only the two bear futures gives JPY 1,326 to 1,367.

Reversion is the main risk to the entry zone, and we keep the zone for now: FY3/24’s 18% came from a mix heavier in commodity E-glass, and our second-source and cycle-bust futures already end at 29% and 37%. The weak point is that FY3/24 is the only pre-AI year on the current segment basis. The 35% tripwire in section 11 tells us if we are wrong.

10 The live tape

The share price has moved on how investors read Nittobo’s disclosures, and three times it fell on good results. Each line maps an event to the lever it moves.

  • 1 Aug 2025. Q1 FY3/26: Electronic Materials operating profit up 17%; guide unchanged. Move: -15.4% next day (abnormal -13.5%, t -4.4). For Nittobo: Expectations lever: the price already assumed more than a steady beat.

  • 6 Nov 2025. H1 results; JPY 34.1bn land-sale gain announced. Move: +18.1% next day (abnormal +19.9%, t 5.9). For Nittobo: A one-off net-profit boost; the cash funds the capex.

  • 28 Nov 2025. Nan Ya to weave ◆ about 20% of Nittobo cloth by 2027. For Nittobo: Adds looms; the yarn still comes from Nittobo. Weaving began in mid-January 2026.

  • 13 May 2026. FY3/27 guide shows net profit down 59% on the base effect; plan targets raised. Move: -11.1% next day (abnormal -12.9%, t -2.9). For Nittobo: Read as no T-glass expansion; the June securities report showed the JPY 15bn Fukushima build under way.

  • 5 to 6 Aug 2026. Q1 margin ◆ 48.2%; OP guide raised to ◆ JPY 30bn; ◆ no further T-glass price rises planned. Move: +12.1% (abnormal +5.8%, t 1.2), then -17.9% (abnormal -16.6%, t -3.3). For Nittobo: Price lever paused for FY3/27; capacity lever unchanged.

  • 5 Aug 2026. Ibiden: qualified cloth suppliers from two to ◆ four. For Nittobo: Share lever: the second-source future’s main evidence.

  • 28 Aug 2026. Nikkei: Nippon Electric Glass to mass-produce low-loss AI-server fibre from spring 2027. For Nittobo: A rival for NE-glass from 2027; no low-CTE claim.

  • 10 Sep 2026. Taiwan Glass August revenue ◆ +32.6%, Fulltech ◆ +79.2%. For Nittobo: Taiwan Glass: +5% on August 2023, +10% over twelve months. Fulltech: +44% over twelve months, mostly price and low-Dk.

  • 21 Sep 2026. FTSE All-World inclusion. For Nittobo: Index buying; no change to value.

  • 28 Sep 2026. A US broker cuts its target from JPY 6,000 to 4,600 in a sector-wide cut; JPMorgan trimmed to JPY 5,500 on 8 Sep. For Nittobo: Sell-side targets drifting toward the price; averages JPY 4,284 to 4,993 by provider.

  • 29 Sep to 1 Oct 2026. Ex-dividend (JPY 12) on 29 Sep; no company news found. Move: JPY 3,100 to 3,335, +7.6% in three sessions. For Nittobo: No change to value; the gap to the weighted value widens to 57%.

Moves are daily closes, split-adjusted, from exchange data (Chokepoints analysis). Abnormal returns strip out the Nikkei 225 with a market model estimated over the 250 to 30 trading days before each event; a t-statistic above 2 in either direction is unlikely to be noise. Broker actions are from Kabutan and Monex’s IFIS rating log; IFIS does not name the 28 Sep broker. Average targets from kabuyoho, minkabu and JapanIR, 1 to 29 Sep 2026.

Up 160% in a year, down 48% from the May peak

Nittobo daily close from January 2025 to October 2026: 1,284 yen on 1 October 2025, a peak of 6,390 on 7 May 2026, falls of 11.1 percent on 13 May and 17.9 percent on 6 August, and 3,335 on 1 October 2026, above the 1,400 to 2,150 entry zone and the 1,446 weighted value.

Exhibit 8. Share price path. Split-adjusted closes: JPY 1,284 on 1 Oct 2025, peak JPY 6,390 on 7 May 2026, JPY 3,335 on 1 Oct 2026. Source: exchange closing prices, split-checked against Kabutan; Chokepoints valuation model v4.1 (WACC 9.2%). Chokepoints analysis. Chart by chokepoints.ai.

The August fall is the one to understand. Q1 beat and the guide went up, yet the shares lost 17.9% the next day, 16.6 points more than the market model predicted.

The raise only just cleared the JPY 28bn QUICK consensus, the stock had risen 12.1% into the print, and AI-related names were weak that day (Fisco, 6 Aug 2026). Nikkei’s reading was that the high-function glass production plan had barely changed (6 Aug 2026). Investors read it as the end of the price rises, while the capacity plan, which sets the expiry date on the shortage, did not change.

The Taiwanese figures understate the cloth business because they are whole-company revenue. Glass fibre, mostly electronic cloth, rose from 23% of Taiwan Glass revenue in 2024 to 30% in the first nine months of 2025 (company spokesman, via Statementdog, 16 Jan 2026). The chairman expects about 40%, and analysts more than 50% by the end of 2026 (Economic Daily News, 12 Jun 2026; Anue, 11 Sep 2026).

Fulltech’s surge is mostly price and low-dielectric cloth. Special grades were about 55% of its first-half revenue, it raised E-glass cloth prices about 30% from 1 July, and its low-CTE cloth has not yet cleared certification (MoneyDJ, 2 Sep 2026; Money Weekly, 10 Aug 2026). For now, read Fulltech as a cloth-price signal rather than a T-glass rival.

Taiwan’s cloth makers are growing, on volume and on price

Monthly revenue growth from January 2025 to August 2026: Taiwan Glass rising to plus 32.6 percent and Fulltech to plus 79.2 percent in August 2026.

Exhibit 9. Taiwan Glass and Fulltech monthly revenue, % y/y. August 2026: Taiwan Glass ◆ +32.6% (NTD 4.59bn), only +5% on August 2023 and +10% over twelve months; Fulltech ◆ +79.2% (NTD 0.91bn), +44% over twelve months. Source: MOPS monthly revenue filings, Chokepoints analysis. Whole-company revenue; Taiwan Glass includes flat glass. Chart by chokepoints.ai.

Capacity and substitution timeline, 2025 to 2029

The relief is dated

Timeline bars from 2025 to 2029: Nittobo's Fukushima building to December 2026 and production from January to March 2027, the Chiayi furnace and doubled yarn by FY3/28, special glass at about three times by FY3/29 and Vlex from FY2028; Nan Ya weaving to 2027; Taiwan Glass supply growth in 2026 and phase 3 in 2027; Asahi Kasei's April 2026 entry; Nippon Electric Glass from spring 2027; TSMC's panel line pilot in 2027 and volume in late 2028.

Exhibit 10. Capacity and substitution timeline. Dates as disclosed or reported. Vlex is placed at ◆ FY2028 onward on Nittobo’s roadmap; Nippon Electric Glass’s fibre is a low-loss grade; Asahi Kasei’s entry is quartz cloth, with no production date given. Source: Nittobo TDnet and IR roadmap; Nittobo Q1 FY3/27 results briefing (5 Aug 2026); Postation (21 Sep 2026); Economic Daily News; Nikkei (1 Apr, 28 Aug 2026); Tech Times (23 Sep 2026). Chokepoints analysis. Chart by chokepoints.ai.

11 The call

Nittobo bull case versus bear case: The bull case Electronic Materials earned 93 percent of FY3/26 group operating profit, and ◆ 48.2 percent of its sales in Q1 FY3/27. No rival was verified at volume in the thinnest low-CTE grades on its own yarn in 2026. Hayashi says even a tripled plant will not be enough, and a US broker still sees cloth about ◆ 30 percent short in 2028. Vlex, at about 2.0 parts per million per degree, would renew the lead if it becomes the standard from 2028. The bear case Nittobo’s own Fukushima building makes its first output in ◆ January to March 2027 and ramps T-glass through FY3/28, and special glass reaches about three times FY3/26 by FY3/29. Ibiden, a leading AI-substrate maker, counts ◆ four qualified cloth suppliers where it had two. The price lever has paused: ◆ no further T-glass rises are planned for FY3/27, and no customer prepayment or long-term agreem
  1. Verdict: HOLD, medium conviction. We hold no position and would not open one at ◆ JPY 3,335. Holders: sell; this turns to trim at a beta of 1.31 or below.

  2. The number: probability-weighted value ◆ JPY 1,446 at a 9.2% WACC, JPY 1,566 at our 8.6% low case, against ◆ JPY 3,335.

  3. Entry zone: JPY 1,400 to 2,150, from the probability-weighted value (JPY 1,446) to the toll-road value (JPY 2,189), both at 9.2% and rounded down to JPY 50.

Nittobo triggers, toward accumulate versus toward avoid: ▲ What moves us to accumulate A segment margin over 60% for two quarters running once Fukushima runs, settled by the H1 FY3/28 results in November 2027. Vlex, due from FY2028, qualified at a named ABF substrate maker with no rival in grade. ▼ What moves us to avoid A named rival qualified in leading-logic ABF core cloth before Vlex arrives in FY2028. A margin below 40%. Any published cut in low-CTE cloth prices, by Nittobo or a rival.

35% is our tripwire on the entry zone. If the Electronic Materials margin stays below 35% for two consecutive quarters after Fukushima output starts in January to March 2027, we re-cut the zone toward the reversion case, JPY 1,005 to 1,119 at an 18% to 22% normal margin.

Bought in the entry zone, the supercycle future is our upside and the second-source and glass-core futures are the losses we accept. Until the price reflects the 2027 date, we do nothing.

12 Scorecard

Nittobo chokepoint scorecard: 01 Chokepoint Thinnest low-CTE cloth for large AI packages; no verified volume rival on own yarn in 2026 Real 02 Where it binds Special-glass yarn: furnaces, fine-filament drawing, customer qualification The yarn 03 Duration Dated and phased. Fukushima first output ◆ Jan to Mar 2027, ramp through FY3/28; about 3x special glass by FY3/29; ◆ four Ibiden suppliers Dated 04 Pricing power Reported +20% (2025) and +30% (2026); ◆ no further T-glass rises planned for FY3/27 Used 05 Valuation ◆ JPY 1,446 weighted vs ◆ JPY 3,335; reverse DCF needs 22.4% EM growth for ten years Above value 06 Balance sheet Cash JPY 45.5bn, debt JPY 49.3bn at 30 Jun 2026; equity ratio 63.2% Low gearing 07 Management New CEO from the division; premium-niche stance on capacity New

13 Dates to watch

Next six months

  • 10th of each month: MOPS revenue: Taiwan Glass, Fulltech, Nan Ya, Unimicron, Kinsus. Lever: second-source volume.

  • 5 Nov 2026: H1 FY3/27 results (Nittobo IR calendar). Lever: margin, guidance, capacity.

  • Dec 2026: Fukushima building completion. Lever: capacity timing.

  • ◆ Jan to Mar 2027: Fukushima first output; Q3 results in early Feb. Lever: capacity timing.

2027 to 2028

  • May 2027: FY3/27 results, FY3/28 guide, the plan’s final year. Lever: margin after ramp.

  • Spring 2027: Nippon Electric Glass mass production; capacity doubled in H2 2027. Lever: low-dielectric competition.

  • 2027: Taiwan Glass phase 3; TSMC CoPoS (chip-on-panel-on-substrate) pilot line. Lever: second source; panel packaging.

  • FY3/28: Fukushima T-glass ramp; T-glass yarn at 2× the plan start; Baotek T-glass cloth mass production. Lever: capacity timing.

  • ◆ FY2028 onward: Vlex commercialisation; TSMC CoPoS mass production in ◆ H2 2028. Lever: qualification reset; panel packaging.

Appendix: watch variables

Each of the 25 watch variables changes over time and moves the view; in the body its current value carries the red diamond. The full table, with each current value, source, cadence and threshold, is in the appendix of the web edition.

Not investment advice. This note is for information and education. It is not investment advice, a personal recommendation or an offer to buy or sell any security. Figures are from public filings and reports as dated in the text; estimates are ours and can be wrong. Do your own research.

All figures come from Nittobo’s kessan tanshin and TDnet notices, rival and customer disclosures, trade press and customs data, each dated where it is used, and the publisher’s own valuation model. Broker targets are cited as published averages; no broker or expert-network research is reproduced. © 2026 chokepoints.ai, Issue 008 All issues

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