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Sumco (3436.T) — chart, structure and Closelooknet read

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Signals for this name

Every Closelooknet reading that exists for 3436.T, from the same nightly bakes the boards use. Research diary readings, not advice.

Versus its index Rubin Build-Out 100 — the name, its sleeve and the index over day, week and month

Versus its index

The name against its Closelooknet index and its own sleeve — equal-weight, nightly closes.

Rubin Build-Out 100 · as of 2026-09-25

DayWeekMonth3 months
3436.T+0.1%+7.5%−9.7%−18.6%
Advanced Materials+0.6%+1.5%+1.5%—
Rubin Build-Out 100+1.7%+5.0%+4.1%—

Against the index: 2.5 pts ahead on the week, 13.8 pts behind on the month; against its Advanced Materials sleeve 11.2 pts behind on the month.

Returns from the index workers’ nightly closes; equal-weight sleeves. A relative reading from the research diary, not advice.

Mentioned on Closelooknet 4 pieces · newest: Morning 10, “Asian Chips — Korea’s chip exports more than tripled and the Kospi touched 7,000, with Tokyo shut” (2026-09-21)

Mentioned on Closelooknet

Where 3436.T appears in the diary — 4 pieces, newest first. Every link is our own writing.

Dailies

Weather around the name 3 macro readings: Money Temperature, Factor regime, Sovereign pressure

The weather around this name

Macro readings that apply by membership — the regime, the factor tape, the sector cell, the funding backdrop.

  • Money Temperature Composite 62/100 · S&P 500 fund at 67, bullish alignedEight instruments scored on position, momentum, volume, volatility and fragility — the regime every name trades inside. Temperature lab → 2026-09-25
  • Factor regime Momentum leading — risk appetite buildingMomentum against low volatility (SPMO / SPLV): above its 50-day trend, 99th percentile of the window, +8.4% over 20 sessions. Factor regime → 2026-09-25
  • Sovereign pressure Index 0.61 · up 0.29 over 21 sessionsG7 long-end yields, 10s30s and the slope — the funding weather for every balance sheet on this site. Sovereign pressure → 2026-09-25
Who it is priced against Rubin Build-Out 100 · Advanced Materials · 6 names with week and year-to-date

Peer group

Rubin Build-Out 100 · Advanced Materials

Specialty chemicals, photoresists, and high-purity materials. Quietly indispensable; never the headline.

Compared against 3436.T on the nightly bakes; the Peers tab ranks the cohort on the Closelooknet scores where it exists.

Company snapshot — Sumco

3436.T in five paragraphs: what it makes and sells, where it sits in the Closelooknet stack, who it is priced against, why we track it, what we watch. Research diary, not advice.

What it does
Sumco makes silicon wafers, the ultra-pure discs of polished silicon that chipmakers use as the base for every semiconductor. It is based in Japan and supplies foundries and memory producers worldwide.
Where it sits in the stack
In our Rubin Build-Out 100, the index tracking the AI supply chain, Sumco sits in Layer 5, Connectivity & Materials, in the Advanced Materials sleeve alongside specialty chemicals and photoresist suppliers. It is a constraint on wafer supply for the foundries and memory makers further along the chip layer, since no chip can be made without the base material it provides.
Who it is priced against
Closelooknet's peer group sets it beside the other Advanced Materials names — Soitec, Entegris, Murata Manufacturing, Resonac, Shin-Etsu Chemical and Siltronic — the specialty-chemical and high-purity material suppliers the build-out depends on quietly.
Why Closelooknet tracks it
Sumco is a constituent of the Rubin Build-Out 100; it carries a Closelooknet score, but only one module has been scored so far, so the read is still being built. The Morning 10 has quoted it twice, both times moving with the wider chip-materials group during broad Asian sell-offs.
What the diary watches
The diary watches whether Sumco's moves keep tracking the broader materials and memory group, or start to separate on its own wafer-demand signal.

Sumco (3436.T) trades on the TSE exchange in Japan, and sits in Layer 5 of the build-out stack. Constituent of Rubin Build-Out 100.

Written from the company’s public profile and Closelooknet’s own readings, 2026-09-17. Descriptive, refreshed with the registry; corrections welcome via the imprint. closelook.net is an investment research diary — market structure, index membership and scores are our own readings, not investment advice. Related: index compare · sector dispersion · scanner.

FAQ · from the current data · as of 2026-09-26

Quick answers

What is Sumco (3436.T)?

Sumco trades as 3436.T on the TSE exchange (Japan) in the Closelooknet research universe, as of the registry build of 2026-09-26.

Is 3436.T in a Closelooknet index?

Yes — Sumco is a constituent of Rubin Build-Out 100, as of 2026-09-26.

Where does 3436.T trade against its moving averages?

Resizing — 47.5% off its high: 47.5% below its 52-week high — a deeper resizing of the trend, not a shallow dip. As of 2026-09-25 — a technical state from the nightly Closelooknet bake, not advice. The Technical tab carries the full row.

How is 3436.T doing against its Closelooknet index?

Over the past month Sumco is −9.7% against +4.1% for the Rubin Build-Out 100 — 13.8 points behind its index, as of 2026-09-25. Its Advanced Materials sleeve is +1.5% over the same month. The “Versus its index” table on this page carries the day, the week and the month for the name, its sleeve and the index.

Where has Closelooknet written about Sumco?

Sumco appears in 4 Closelooknet pieces, most recently Morning 10: Asian Chips — Korea’s chip exports more than tripled and the Kospi touched 7,000, with Tokyo shut (2026-09-21); Morning 10: Yen — the Bank of Japan hikes and the dollar holds 157: the carry trade pays, the lines held, chips +3.4% over $505 (2026-09-18); Morning 10: AI trade — the labs ask for a slowdown: Kospi −3.3%, SoftBank −11%, Nasdaq futures −1.2%, oil back above $106 (2026-09-14). What Closelooknet said most recently: Rubin closed +1.5% at 1,904.95 on its Foundry and Architects layers while its Japanese constituents fell 0.9% — Sumco −3.7%, Resonac −4.0% — which makes Tokyo Electron’s +4.2% this morning the first equipment name on either continent to… (Morning 10, 2026-09-18). The "Mentioned on Closelooknet" block on this page lists the long reads, the reference entries and the dailies that name it.

What does Sumco do?

Sumco makes silicon wafers, the ultra-pure discs of polished silicon that chipmakers use as the base for every semiconductor. It is based in Japan and supplies foundries and memory producers worldwide. Closelooknet's peer group sets it beside the other Advanced Materials names — Soitec, Entegris, Murata Manufacturing, Resonac, Shin-Etsu Chemical and Siltronic — the specialty-chemical and high-purity material suppliers the build-out depends on quietly.

Where does Sumco sit in the AI build-out?

In our Rubin Build-Out 100, the index tracking the AI supply chain, Sumco sits in Layer 5, Connectivity & Materials, in the Advanced Materials sleeve alongside specialty chemicals and photoresist suppliers. It is a constraint on wafer supply for the foundries and memory makers further along the chip layer, since no chip can be made without the base material it provides. Sumco is a constituent of the Rubin Build-Out 100; it carries a Closelooknet score, but only one module has been scored so far, so the read is still being built. The Morning 10 has quoted it twice, both times moving with the wider chip-materials group during broad Asian sell-offs.

What does this page show?

A live price chart with SMA overlays and drawing tools for 3436.T, performance metrics, index-membership context and the Closelooknet structure read — an investment research diary view, not investment advice.

Related in the Closelooknet universe

same Closelooknet index seat first. Scored names rank on their Closelooknet score; names without one rank on trend state — above or below their 50- and 200-day averages — never on a score they do not carry.