ABF Substrate on Korea Invest Insights

KOSDAQ Surges 4% as ABF Substrate Stocks Break Out

Fri, 22 May 2026 23:30:00 +0900

KOSDAQ Jumps 4%, ABF Substrate Names Break Out While Samsung Electronics Faces Foreign Selling

South Korea’s equity market split sharply on Friday, May 22, 2026. The KOSPI — South Korea’s large-cap benchmark index — gained a modest 0.5%, but the story was in the secondary market: the KOSDAQ, home to South Korea’s mid-cap growth and tech names, surged roughly 4% on the session. Market breadth expanded meaningfully, with 99 stocks passing momentum and flow screens — a signal that institutional interest is rotating beyond a handful of mega-caps into a broader set of Korean equities.

The divergence was not random noise. It reflects a shift in what the market is pricing: not the AI semiconductor giants, but the infrastructure layer underneath them.

ABF Substrate: Morgan Stanley Raises the Bar

The most significant fundamental catalyst of the session came from a Morgan Stanley research note circulating in Korean market channels. The bank raised its forecast for high-performance ABF (Ajinomoto Build-up Film) substrate shortage rates — a key bottleneck in advanced semiconductor packaging — from 15% to 22% by 2030.

ABF substrate is a critical material used in high-end chip packaging, particularly for AI accelerators and high-bandwidth memory (HBM) applications. Supply has been structurally constrained as chipmakers race to stack more logic and memory in tighter packages. A 22% shortage rate by decade’s end implies sustained pricing power for the handful of companies that dominate global ABF substrate supply.

Two Korean names sit at the center of this theme.

Samsung Electro-Mechanics (009150.KS), South Korea’s largest passive components and substrate manufacturer, gained +11.30% on Friday — bringing its five-day return to +32.67%. Foreign investors were net buyers of ₩17.4 billion during the session. Institutional funds were net sellers, suggesting profit-taking after the sharp run-up, but price action held above the ₩1.219 million breakout level that technicians had flagged as the key reference.

Daedeok Electronics (317400.KS), a specialist in ABF and HDI printed circuit boards for advanced packaging, rose +3.35% with five-day gains of +11.41%. Institutional buying of ₩12.7 billion was notable, though foreign investors trimmed ₩7.4 billion — a split that bears watching heading into next week.

Why does the Morgan Stanley revision matter now? Because the market had already begun pricing a substrate recovery, but the revised shortage estimate provides fresh analytical support for continuing that move. The question is whether the 5-day momentum in these names has gotten ahead of near-term fundamentals, or whether the re-rating has further to run as more sell-side houses update their models.

Samsung Electronics: Foreign Selling Resumes After 5-Day Recovery

Samsung Electronics (005930.KS), South Korea’s largest company by market cap and the world’s top memory chip producer by revenue, gave back -2.34% on Friday after a strong five-day run of +8.13%. The one-day pullback was amplified by foreign investor net selling of ₩1.01 trillion — one of the largest single-session foreign outflows for the stock in recent weeks. Program trading added another ₩998.2 billion of net selling pressure.

The timing is awkward. Mirae Asset, one of Korea’s largest domestic brokerages, included Samsung Electronics and SK Hynix (000660.KS) — South Korea’s second-largest memory chipmaker — in its second-half Top Picks list, citing re-rating potential as memory pricing and AI demand visibility improve. That positive framing from domestic research sits uneasily against Friday’s foreign outflow.

The pattern is familiar: a sharp recovery rally, then a test of whether foreign investors use strength to reduce exposure. At ₩1 trillion of selling in a single session, Friday qualifies as the latter. Until foreign and program selling decelerates, Samsung Electronics is likely range-bound rather than in a clean breakout.

Jusung Engineering and the Semiconductor Equipment Breakout

Friday’s top-performing new entrant in momentum screens was Jusung Engineering (036930.KS), a Korean semiconductor equipment maker focused on deposition and etch tools for advanced logic and memory fabs. The stock surged +20.95% in a session characterized by simultaneous buying from both foreign investors (+₩24.3 billion) and domestic institutions (+₩15.8 billion) — a “co-buy” pattern that screeners flag as a higher-conviction entry signal.

The ₩214,000 level becomes the key reference: it represents where the stock opened the gap, and holding above it in the coming sessions would validate the breakout rather than mark it as a one-day spike. Equipment stocks have underperformed the semiconductor supply chain for most of 2025; if capex guidance from Samsung and SK Hynix for the second half of 2026 holds firm, the equipment cycle laggards have room to catch up.

Simtech (222800.KS), a PCB and ABF substrate specialist, also appeared in upper tiers of momentum screens with a +5.02% gain on co-buy flows (foreign +₩8.6 billion, institutional +₩5.8 billion). The name is worth tracking alongside Daedeok Electronics as the ABF substrate supply-chain thesis widens.

Sector Rotation: Beyond Semiconductors

One of the clearer signals from Friday’s session is that leadership is no longer concentrated in semiconductors. The strongest sectors on the day included:

Pharmaceuticals and biotech: several names saw double-digit gains, extending a recent run that some desks attribute to pipeline updates and improving regulatory sentiment
Power and energy infrastructure: beneficiary of AI data center electricity demand narratives gaining traction in Korean media
Semiconductor materials and components (소부장): the ABF names above, plus smaller equipment and chemical suppliers

Telecom was notably weak. SK Telecom (017670.KS), South Korea’s largest mobile carrier by subscriber count, was flat on the day with net foreign selling of ₩58.6 billion and institutional selling of ₩4 billion. Defensive sectors tend to underperform on days when breadth expands into growth names — and Friday fit that pattern cleanly.

The won/dollar exchange rate at ₩1,516 remains a background constraint. A weaker won increases the cost of dollar-denominated imports and adds translation risk for foreign investors considering Korean equity exposure, which partly explains why even a broadly positive day produced heavy foreign selling in liquid large-caps like Samsung Electronics.

What to Watch Next Week

Five checkpoints define the near-term outlook for Korean equity market participants:

Samsung Electro-Mechanics price defense: Does the ₩1.219 million breakout level hold, and does the stock extend toward ₩1.34 million? Institutional profit-taking is normal after a 32% five-day run; the question is whether foreign buying absorbs it.
Samsung Electronics foreign flow: Does Friday’s ₩1.01 trillion outflow represent a one-day flush, or does it continue into Monday? Two consecutive sessions of heavy foreign selling would shift the near-term bias.
Daedeok Electronics foreign buyer conversion: Institutional accumulation is constructive, but ABF substrate stocks tend to get a second leg only when foreign investors also commit. Watch whether foreign selling of ₩7.4 billion shrinks or reverses.
Jusung Engineering breakout validation: A close above ₩214,000 on Monday — ideally on continued co-buy flows — would confirm the equipment sector is re-entering a leadership window.
KOSDAQ breadth composition: Friday’s 4% KOSDAQ surge was broad, but distinguishing between a bio-led one-day spike and a sustained rotation into semiconductor equipment and growth names matters for whether the trend extends.

The ABF substrate re-rating, if the Morgan Stanley supply shortage estimates prove durable, is the kind of multi-year structural theme that tends to produce several distinct entry windows rather than a single breakout. Friday may have been the first window. Whether it holds depends on whether the fundamental thesis outpaces the technical overextension.

Data sourced from KRX intraday flow data, KR Crawler DB (prices_daily, investor_flow_daily, program_trade_daily) as of 16:05 KST on May 22, 2026. Ticker symbols reference KRX listings. This post is market analysis, not investment advice.

Korea Quality Re-Rating Watch 2026-05-22: VM, SamC&S and TLB — Five-Screener Clean Sweep

Fri, 22 May 2026 16:30:00 +0900

Macro Dashboard

Indicator	Level	5-Day Δ	Signal
KOSPI	7,847.7	+4.4%	▲ Bull
KOSDAQ	1,161.1	+4.5%	▲ Bull
VIX	17.0	−4.5%	✓ Stable
US 10Y	4.59%	−0.01pp	→ Flat
USD/KRW	1,517	+1.3%	⚠ KRW weak
Brent	$105.4	−6.0%	▼ Falling
KR Regime	Bull	—	Aggressive expand
US Regime	Bull	—	Supportive

Both Korea and the US are in Bull regime. KOSPI five-day breadth above the 50-day MA stands at 36.0% and above the 200-day MA at 47.8% — constructive but not overheated. The main friction: USD/KRW at 1,517 compresses USD-denominated returns even as Korean prices advance. The tailwind: Brent down 6% over five sessions takes pressure off Korea’s energy-import bill and widens industrial margins.

Market Wrap

Today’s session was selective risk-on, not a full-market breakout. KOSPI held near +0.5% intraday while KOSDAQ surged approximately +4%, with 99 names clearing quality screener filters — the widest breadth count in recent sessions.

Sectors leading. Pharmaceuticals and biotech drove KOSDAQ’s advance, joined by power/energy equipment and semiconductor materials-and-equipment plays. The ABF substrate theme re-ignited after Morgan Stanley reportedly raised its 2030 supply-shortage-rate forecast for high-performance ABF substrates from 15% to 22% — a demand-outlook upgrade that directly lifted PCB and advanced packaging names. Samsung Electro-Mechanics (009150.KS) surged +11.3% on the day (+32.7% over five sessions) on that thesis; Daedeok Electronics (353200.KQ) added +3.3% in the same theme, though institutional and foreign flows diverged between the two. Semiconductor equipment saw a separate breakout: Juseong Engineering (036930.KQ) rallied +20.9% with simultaneous foreign and institutional co-buying.

Sectors lagging. Large-cap semis absorbed profit-taking after the prior session’s rally. Samsung Electronics (005930.KS) recorded net foreign selling of approximately ₩1.01tn and program selling of ₩998bn, capping KOSPI upside. Telecoms and defensives underperformed as capital rotated toward higher-beta growth themes.

Flow picture. Institutional and foreign buying concentrated in mid-cap semiconductor equipment, ABF substrate, and biotech names while reducing in large-cap semis and telecoms. KOSDAQ breadth above the 50-day MA reached 36.0%; quality screener breadth above the 200-day MA hit 47.8% — both consistent with a broadening rather than narrowing rally. That said, USD/KRW above 1,515 and the magnitude of Samsung Electronics’ foreign outflow signal that full risk-on has not been confirmed. Today reads as quality mid-cap accumulation with selective large-cap rotation out.

Today’s Quality Re-Rating Candidates

The May 22 meta screener processed 115 names and produced a sharp hierarchy. Three stocks cleared all five quality-flow screeners simultaneously — Quality Compounder, Smart Money Quality, Cycle Rerating, Smart Money Earnings, and PEAD — a combination that rarely fires on more than one or two names per session.

Top 10 Candidates

#	Ticker	Name	Meta Score	Overlap	Screeners Hit	Key Metrics
1	252990.KQ	SamC&S	97.5	5/5	QC · SMQ · CR · SME · PEAD	ROE 9.7%, OP +183%, OPM +9.1pp, F+QI +₩5.5bn 5d
2	089970.KQ	VM	96.5	5/5	QC · SMQ · CR · SME · PEAD	ROE 14.7%, OP +387%, OPM +29.3pp, F+QI +₩33.0bn 5d
3	356860.KQ	TLB	90.1	4/5	QC · SMQ · CR · SME	ROE 16.0%, OP +665%, OPM +8.2pp, F+QI +₩8.5bn 5d
4	053610.KQ	Protek	72.8	3	QC · CR · PEAD + Consensus↑	ROE 13.7%, OP +245%, OPM +12.2pp
5	095610.KQ	TES	72.2	3	QC · SMQ · SME	ROE 14.5%, OP +50%, F+QI +₩26.1bn 5d, DART supply contract
6	000660.KS	SK Hynix	65.8	2	QC · CR + Consensus↑	ROE 35.6%, OP +101%, OPM +13.1pp ⚠ F+QI sell ₩5.35tn 5d
7	218410.KQ	RFHIC	59.7	4	SMQ · CR · SME · PEAD	OPM +15.3pp, F+QI +₩13.9bn 5d ⚠ short interest 7.2%
8	147830.KS	Jearyong Ind.	58.4	3	QC · CR · PEAD	ROE 13.9%, OP +159%, OPM +13.9pp
9	092460.KQ	Halla IMS	53.5	2	QC · CR	ROE 13.8%, OP +39%, DART earnings pre-disclosure
10	482630.KQ	Samyang NCC	51.7	2	QC · PEAD	ROE 14.7%, OP +65%, IR held May 18

QC = Quality Compounder · SMQ = Smart Money Quality · CR = Cycle Rerating · SME = Smart Money Earnings · F+QI = foreign + qualified institutional net flow

Deeper Look: Top 3

SamC&S (252990.KQ) — Meta Score 97.5

SamC&S is an electronic components manufacturer. The three-layer logic is intact: (1) Quality — operating profit grew +183% YoY with OPM expanding +9.1pp, an early earnings inflection for a business with stable fundamentals; (2) Flow — foreign and qualified institutional investors net-bought ₩5.5bn over five days, absorbing ₩5.4bn of retail selling — a clean smart-money accumulation pattern; (3) Catalyst — the company held an IR session on May 21 (DART-confirmed), indicating management is actively engaging investors around the improved story. Next checks: OPM sustainability into Q2 2026; whether institutional buying persists after the post-IR window closes.

VM (089970.KQ) — Meta Score 96.5

VM manufactures semiconductor equipment. The cycle signal is exceptional: operating margin expanded +29.3pp on +105% revenue growth, producing an operating leverage spread of 281pp. The Cycle Rerating screener ranks VM #1 (score 0.747) — typically a signal that revenue is converting to earnings at an unusually high rate. Foreign and qualified institutional buying of ₩33.0bn over five sessions absorbed ₩21.5bn in retail selling. The stock trades at its 52-week high. Next checks: H2 2026 order backlog disclosures; whether the margin expansion is structural or concentrated in a single large order.

TLB (356860.KQ) — Meta Score 90.1

TLB makes electronic components in the PCB space. Operating profit grew +665% YoY with OPM up +8.2pp; the operating leverage spread of 621pp is among the most extreme cycle re-rating readings in the KR universe today. Smart Money Earnings ranks TLB #1 (score 0.854) and it also ranks #1 in Smart Money Quality — institutional and foreign co-buying is firing simultaneously across both money-flow screens. An IR session on May 15 was DART-confirmed. Today’s Morgan Stanley ABF/substrate supply-upgrade narrative may provide a sector tailwind if TLB’s product mix directly overlaps. Next checks: confirm product exposure to high-performance ABF substrates; two insider trading plan filings logged on DART May 15 are worth monitoring for directional signals.

SK Hynix (000660.KS) — flag. Fundamentals remain strong (ROE 35.6%, OPM +13.1pp, active consensus upgrades), but net foreign and qualified institutional selling of ₩5.35tn over five sessions is being absorbed by retail — the inverse of the accumulation pattern this framework is built to catch. The meta screener scores it 65.8, reflecting this divergence. Watch for flow stabilization before treating it as an actionable re-rating candidate.

Screener data as of 2026-05-22 16:24 KST. This is public market analysis for informational purposes only. All screened names are research candidates requiring independent due diligence.