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Market Pulse

KIS quote snapshot · Sep 23, 2026 15:30 KST · KIS quote snapshots + ECOS · 30 min refresh
KOSPI
7,080.92
+63.01 (+0.90%)
KOSDAQ
844.48
+10.10 (+1.21%)
KOSPI 200
1,126.12
+12.82 (+1.15%)
USD/KRW
1,358.40
Insights

Market Insights

Curated independent writers covering global technology, US equities, Korean stocks, semiconductors, AI infrastructure, photonics, power, and market structure.

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Earnings growth rankings

Sort Korean listed companies by latest-quarter revenue and operating-profit growth versus the previous quarter and the prior-year quarter.

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AI semis@damnang

[Expert Call Report] Samsung HBM Hybrid Bonding: From Technology to Volume Production

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DADamnang
Featured Creator
Damnang
Substack

EE Ph.D. and Silicon Valley semiconductor engineer making complex technology easy to understand.

Latest posts
View creator
Semiconductors/Sep 17, 2026
[Expert Call Report] Intel's Competitive Position
Semiconductors/Sep 15, 2026
Is the 2028 Memory Downcycle Real?
AI semis/Sep 11, 2026
The AI Memory Masterclass with Damnang
AI semis@photoncap

SK hynix’s Four Packaging Paths: Where Is the Fight After HBM?

Open the original post for the writer's full context.

PCPhotonCap
Featured Creator
PhotonCap
Substack

Seeing tech through a different wavelength. Photonics and semiconductor research.

Latest posts
View creator
Photonics/Sep 20, 2026
Is a Slow Mirror Fast Enough? OCS Technology Economics and Market Flow
Photonics/Sep 17, 2026
[Investment Map] 22 Listed Companies in the Hybrid Bonding Value Chain
Photonics/Sep 16, 2026
The Dispersion Problem in microLED Optical Interconnects: Credo’s 30 Meters, MOSAIC’s Data, and the Hyperlume Patent
Photonics@nuttycld

Optical Switches for AI: Competition Beyond Mirrors

Open the original post for the writer's full context.

NUNutty
Featured Creator
Nutty
Substack

Analog IC design engineer writing about circuits, semiconductors, power, and AI infrastructure.

Latest posts
View creator
AI semis/Sep 14, 2026
An Investor's Handbook IV - AI Inference (2)
Power/Sep 06, 2026
The Advanced Packaging Primer
AI semis/Aug 27, 2026
An Investor's Handbook IV - AI Inference (1)
Latest market essays
Latest Substack essays from selected writers, ordered by publish date.
@growthpapa
Sep 23, 2026
FeaturedSubstackKorean equitiesLong-form
Weekly Market Check | September, Week 4: A Step Back from the Market
Open
@growthpapa
Sep 22, 2026
FeaturedSubstackPhotonicsLong-form
[Sector Check] Optical | Why Credo Gave Up 30%, and Why Innolight Is Going to the Summit
Open
@growthpapa
Sep 17, 2026
FeaturedSubstackKorean equitiesLong-form
Fluence: The Fourth Broken Promise, and the Test I’m Setting for the Fifth
Open
@damnang
Sep 23, 2026
SubstackAI semisLong-form
[Expert Call Report] Samsung HBM Hybrid Bonding: From Technology to Volume Production
Open
@nuttycld
Sep 22, 2026
SubstackPhotonicsLong-form
Optical Switches for AI: Competition Beyond Mirrors
Open
@photoncap
Sep 21, 2026
SubstackAI semisLong-form
SK hynix’s Four Packaging Paths: Where Is the Fight After HBM?
Open
@photoncap
Sep 20, 2026
SubstackPhotonicsLong-form
Is a Slow Mirror Fast Enough? OCS Technology Economics and Market Flow
Open
@photoncap
Sep 17, 2026
SubstackPhotonicsLong-form
[Investment Map] 22 Listed Companies in the Hybrid Bonding Value Chain
Open
@growthpapa
Sep 17, 2026
SubstackKorean equitiesLong-form
Global Megawave, October 2026
Open
@damnang
Sep 17, 2026
SubstackSemiconductorsLong-form
[Expert Call Report] Intel's Competitive Position
Open
@photoncap
Sep 16, 2026
SubstackPhotonicsLong-form
The Dispersion Problem in microLED Optical Interconnects: Credo’s 30 Meters, MOSAIC’s Data, and the Hyperlume Patent
Open
@damnang
Sep 15, 2026
SubstackSemiconductorsLong-form
Is the 2028 Memory Downcycle Real?
Open
@growthpapa
Sep 14, 2026
SubstackKorean equitiesLong-form
Uber: Three Executives Bought in the Same Week
Open
@photoncap
Sep 14, 2026
SubstackAI semisLong-form
Memory Made at Home, GPUs Imported, Optics Blank: The Third Layer of Korea's Sovereign AI Procurement
Open
@nuttycld
Sep 14, 2026
SubstackAI semisLong-form
An Investor's Handbook IV - AI Inference (2)
Open
@growthpapa
Sep 11, 2026
SubstackKorean equitiesLong-form
Letters from Florence #35: The Autumn Wind, and Back to the Desk
Open
@damnang
Sep 11, 2026
SubstackAI semisLong-form
The AI Memory Masterclass with Damnang
Open
@growthpapa
Sep 10, 2026
SubstackKorean equitiesLong-form
The Bigger the Chip, the Fewer the Substrates: Three Layers of Materials, Two Seeds
Open
Rows are collected from public RSS feeds and link back to the original Substack posts.
Featured writers
Curated RSS sources for technology and market insight.
GWGrowth Wave
Growth Wave
@growthpapa
DADamnang
Damnang
@damnang
PCPhotonCap
PhotonCap
@photoncap
NUNutty
Nutty
@nuttycld
Source policy

Cards use RSS title, author, publication date, and outbound URL metadata. Visuals are Korean Tickers-owned local fallbacks; publisher descriptions and images are not republished.

Topics covered

Technology and market themes

Labels help readers follow essays across infrastructure, semiconductors, optical networks, power systems, and equity market context.

AI semiconductors

HBM, memory bandwidth, advanced packaging, GPU supply chains, and AI inference silicon.

AI infrastructure

Data centers, GPU clusters, power delivery, AI factories, and compute infrastructure.

Semiconductors

Memory, HBM, foundry, advanced packaging, test equipment, substrates, and semiconductor supply chains.

Photonics

Optical networking, CPO, lasers, transceivers, optical components, and high-speed interconnects.

Power delivery

Grid upgrades, transformers, capacitors, voltage architecture, and power systems for AI compute.

Market structure

Equity market positioning, valuation cycles, sector rotation, and trading context.

Korean equities

KOSPI and KOSDAQ companies connected to global technology, AI, semiconductors, and industrial supply chains.

Korean Tickers·Research reference for Korean listed companies.
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