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Kioxia (285A.T) — chart, structure and Closelooknet read

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Signals for this name

Every Closelooknet reading that exists for 285A.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
285A.T+2.2%+7.8%+9.5%−39.6%
Storage+2.0%+1.3%+8.4%—
Rubin Build-Out 100+1.7%+5.0%+4.1%—

Against the index: 2.8 pts ahead on the week, 5.4 pts ahead on the month; against its Storage sleeve 1.1 pts ahead 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 5 pieces · newest: Morning 10, “Rates — the 30-year hits its highest since 2004; Oracle and Arm sold, Meta and Intel bought, Nasdaq ends flat” (2026-09-25)

Mentioned on Closelooknet

Where 285A.T appears in the diary — 5 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 · HBM Memory · 4 names with week and year-to-date

Peer group

Rubin Build-Out 100 · HBM Memory

High-bandwidth memory — the part of the AI compute stack that has actually run out of supply. Storage split out to its own sub-index in the 2026-06-30 reconstitution.

Compared against 285A.T on the nightly bakes; the Peers tab ranks the cohort on the Closelooknet scores where it exists.

Company snapshot — Kioxia

285A.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
Kioxia makes NAND flash memory chips, the storage used in solid-state drives across phones, laptops and data centres. It was spun out of Toshiba's memory business and is listed on the Tokyo exchange. It is one of only a handful of companies making flash memory at scale, alongside Samsung, SK Hynix and Micron.
Where it sits in the stack
In Rubin, our index of the AI build-out supply chain, Kioxia sits in Layer 3, Assembly & Test, within the HBM Memory sleeve — the segment tracking memory that AI accelerators need and that has run short of supply. The diary notes storage is due to move into its own sub-index at a mid-2026 reconstitution, separating flash storage from high-bandwidth memory proper. Kioxia is a supplier the layer depends on when memory capacity, not the chip itself, limits how many systems get built.
Who it is priced against
Its Closelooknet peer group is the HBM Memory sleeve of Rubin, alongside Sandisk, SK Hynix, Micron and Samsung; the wider market comparison is Western Digital, the drive maker Sandisk was spun from.
Why Closelooknet tracks it
Kioxia is a constituent of the Rubin Build-Out 100 and carries a Closelooknet score, though only one module is scored so far, so the score is still being built. The Morning 10 has named it four times, mostly in Asia sell-off reports where it moved alongside SK Hynix and Samsung.
What the diary watches
Whether the mid-2026 reconstitution that splits storage from HBM memory changes how Kioxia's moves are read against the high-bandwidth memory names it currently sits beside.

Kioxia (285A.T) trades on the TSE exchange in Japan, and sits in Layer 3 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 Kioxia (285A.T)?

Kioxia trades as 285A.T on the TSE exchange (Japan) in the Closelooknet research universe, as of the registry build of 2026-09-26.

Is 285A.T in a Closelooknet index?

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

Where does 285A.T trade against its moving averages?

Reclaimed its 50-day: Closed back above its 50-day line 2 sessions ago, with the 200-day still rising beneath it. As of 2026-09-25 — a technical state from the nightly Closelooknet bake, not advice. The Technical tab carries the full row.

How is 285A.T doing against its Closelooknet index?

Over the past month Kioxia is +9.5% against +4.1% for the Rubin Build-Out 100 — 5.4 points ahead of its index, as of 2026-09-25. Its Storage sleeve is +8.4% 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 Kioxia?

Kioxia appears in 5 Closelooknet pieces, most recently Morning 10: Rates — the 30-year hits its highest since 2004; Oracle and Arm sold, Meta and Intel bought, Nasdaq ends flat (2026-09-25); Morning 10: AI trade — sellers of compute sold, buyers bought: chips −5.6%, software +5%, SoftBank +7% in Tokyo (2026-09-15); 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: Tokyo extended its gains: Nikkei 225 66,356.13 (+1.29%) at 05:52 UTC; Tokyo Electron +4.56%, Advantest +2.48%, Kioxia +2.02%; SoftBank -2.68%; the yen firmer at 158.18 per dollar (Morning 10, 2026-09-25). The "Mentioned on Closelooknet" block on this page lists the long reads, the reference entries and the dailies that name it.

What does Kioxia do?

Kioxia makes NAND flash memory chips, the storage used in solid-state drives across phones, laptops and data centres. It was spun out of Toshiba's memory business and is listed on the Tokyo exchange. It is one of only a handful of companies making flash memory at scale, alongside Samsung, SK Hynix and Micron. Its Closelooknet peer group is the HBM Memory sleeve of Rubin, alongside Sandisk, SK Hynix, Micron and Samsung; the wider market comparison is Western Digital, the drive maker Sandisk was spun from.

Where does Kioxia sit in the AI build-out?

In Rubin, our index of the AI build-out supply chain, Kioxia sits in Layer 3, Assembly & Test, within the HBM Memory sleeve — the segment tracking memory that AI accelerators need and that has run short of supply. The diary notes storage is due to move into its own sub-index at a mid-2026 reconstitution, separating flash storage from high-bandwidth memory proper. Kioxia is a supplier the layer depends on when memory capacity, not the chip itself, limits how many systems get built. Kioxia is a constituent of the Rubin Build-Out 100 and carries a Closelooknet score, though only one module is scored so far, so the score is still being built. The Morning 10 has named it four times, mostly in Asia sell-off reports where it moved alongside SK Hynix and Samsung.

What does this page show?

A live price chart with SMA overlays and drawing tools for 285A.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.