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SK Hynix Inc (000660.KS) — chart, structure and Closelook read

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Company snapshot — SK Hynix Inc

000660.KS in five paragraphs: what it makes and sells, where it sits in the Closelook stack, who it is priced against, why we track it, what we watch. Research diary, not advice.

What it does
SK Hynix designs and manufactures memory chips, including DRAM, NAND flash, SSDs and high-bandwidth memory used in servers, mobile devices, PCs, consumer electronics and automotive systems. It also runs a foundry business that makes non-memory semiconductors for customers. The company is headquartered in Icheon-si, South Korea, and sells across Asia, the United States and Europe.
Where it sits in the stack
In our index, SK Hynix sits in Layer 3, Assembly & Test, within the HBM Memory sleeve — the part of the AI compute stack where high-bandwidth memory supply has run short. Its output is a constraint on how many AI accelerators can be paired with enough memory bandwidth, since each accelerator needs stacked memory alongside it.
Who it is priced against
Closelook's peer group places it with the other memory makers — Micron Technology, Samsung Electronics, Sandisk, Western Digital and Seagate Technology — the set the market prices it against rather than a broader sector list; Kioxia is the additional name often mentioned alongside them.
Why Closelook tracks it
It holds a seat in our index and carries a Closelook score across several modules, with quality the strongest reading and momentum the weakest. The diary has quoted it in a dossier on the AI chip supply chain and in a report on the Nvidia ecosystem, where it appears among names tied to HBM4 supply.
What the diary watches
Whether HBM supply and demand stay tight enough to keep the quality reading firm even as the momentum reading lags.

SK Hynix Inc (000660.KS) trades on the KO exchange in South Korea, classified under Technology, and sits in Layer 3 of the build-out stack. Constituent of Rubin Build-Out 100.

The Closelook company score reads 68/100 composite (momentum 36, quality 94, valuation 74) across 7 modules — the full breakdown, chart structure and analog history load live above.

Written from the company’s public profile and Closelook’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: 000660.KS news on the tape · index compare · sector dispersion · scanner.

Signals for this name

Every Closelook reading that exists for 000660.KS, from the same nightly bakes the boards use. Research diary readings, not advice.

Who it is priced against Memory makers · 5 names with week and year-to-date

Peer group

Memory makers

Curated competitor set — who the market prices this name against, not just who shares its sector.

Compared against 000660.KS on the nightly bakes; the Peers tab ranks the cohort on the Closelook scores where it exists.

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 Closelook index and its own sleeve — equal-weight, nightly closes.

Rubin Build-Out 100 · as of 2026-09-17

DayWeekMonth3 months
000660.KS−0.8%−5.8%+16.3%−35.0%
HBM Memory+1.4%−5.3%+7.5%—
Rubin Build-Out 100+1.5%−2.2%−2.9%—

Against the index: 3.6 pts behind on the week, 19.2 pts ahead on the month; against its HBM Memory sleeve 8.8 pts ahead on the month.

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

Weather around the name 4 macro readings: Money Temperature, Factor regime, Sector × region …

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 55/100 · S&P 500 fund at 58, above its 50- and 200-day averagesEight instruments scored on position, momentum, volume, volatility and fragility — the regime every name trades inside. Temperature lab → 2026-09-17
  • Factor regime Momentum leading — risk appetite buildingMomentum against low volatility (SPMO / SPLV): above its 50-day trend, 94th percentile of the window, +2.7% over 20 sessions. Factor regime → 2026-09-17
  • Sector × region Technology in emerging markets: −4.0% week · −1.7% month · −1.6% quarter · +28.0% year (approximated)The Sector Engine cell this name lives in, from EM:CN+TW+IN+KR+BR+SA+MX+ZA+ID+TH+MY+OTHER; the 11 × 4 matrix shows where its sector is being bought and where it is being sold. Sector Engine → 2026-09-16
  • Sovereign pressure Index 0.00 · down 0.41 over 21 sessionsG7 long-end yields, 10s30s and the slope — the funding weather for every balance sheet on this site. Sovereign pressure → 2026-09-17

FAQ · from the current data · as of 2026-09-18

Quick answers

What is SK Hynix Inc (000660.KS)?

SK Hynix Inc trades as 000660.KS on the KO exchange (South Korea) and is classified under Technology in the Closelook research universe, as of the registry build of 2026-09-18.

Is 000660.KS in a Closelook index?

Yes — SK Hynix Inc is a constituent of Rubin Build-Out 100, as of 2026-09-18.

What is SK Hynix Inc's Closelook composite score?

68 out of 100, with momentum 36, quality 94 and valuation 74 sub-scores, as of 2026-09-18. Scores are Closelook's own research readings, not ratings or investment advice.

Where does 000660.KS 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 2026-09-17 — a technical state from the nightly Closelook bake, not advice. The Technical tab carries the full row.

How is 000660.KS doing against its Closelook index?

Over the past month SK Hynix Inc is +16.3% against −2.9% for the Rubin Build-Out 100 — 19.2 points ahead of its index, as of 2026-09-17. Its HBM Memory sleeve is +7.5% 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.

What does SK Hynix Inc do?

SK Hynix designs and manufactures memory chips, including DRAM, NAND flash, SSDs and high-bandwidth memory used in servers, mobile devices, PCs, consumer electronics and automotive systems. It also runs a foundry business that makes non-memory semiconductors for customers. The company is headquartered in Icheon-si, South Korea, and sells across Asia, the United States and Europe. Closelook's peer group places it with the other memory makers — Micron Technology, Samsung Electronics, Sandisk, Western Digital and Seagate Technology — the set the market prices it against rather than a broader sector list; Kioxia is the additional name often mentioned alongside them.

Where does SK Hynix Inc sit in the AI build-out?

In our index, SK Hynix sits in Layer 3, Assembly & Test, within the HBM Memory sleeve — the part of the AI compute stack where high-bandwidth memory supply has run short. Its output is a constraint on how many AI accelerators can be paired with enough memory bandwidth, since each accelerator needs stacked memory alongside it. It holds a seat in our index and carries a Closelook score across several modules, with quality the strongest reading and momentum the weakest. The diary has quoted it in a dossier on the AI chip supply chain and in a report on the Nvidia ecosystem, where it appears among names tied to HBM4 supply.

Where has Closelook written about SK Hynix Inc?

SK Hynix Inc appears in 15 Closelook pieces, most recently 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: Rates — Fed day at a 5% 10-year: the hike is priced, the cycle is not; Yardeni cuts the S&P target to 7,900 (2026-09-16); Morning 10: AI trade — sellers of compute sold, buyers bought: chips −5.6%, software +5%, SoftBank +7% in Tokyo (2026-09-15). What Closelook said most recently: This morning Tokyo Electron is +4.2% in Tokyo, the Nikkei +1.6% at 65,159, the Kospi +2.8% with SK Hynix +6.0%, the Taiex +1.9%; US futures +0.3%. (Morning 10, 2026-09-18). The "Mentioned on Closelook" block on this page lists the long reads, the reference entries and the dailies that name it.

What does this page show?

A live price chart with SMA overlays and drawing tools for 000660.KS, performance metrics, index-membership context and the Closelook structure read — an investment research diary view, not investment advice.

Mentioned on Closelook 15 pieces · newest: 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)

Mentioned on Closelook

Where 000660.KS appears in the diary — 15 pieces, newest first. Every link is our own writing.

Go deeper

Long reads

101 and glossary

Dailies

Related in the Closelook universe