Korea Quality Re-Rating Watch 2026-07-01: ISU Petasys & Hyosung Heavy

Wed, 01 Jul 2026 16:30:00 +0900

Macro Dashboard

Indicator	Level	5-Day Change	Signal
KOSPI	8,303	−7.0%	Bear
KOSDAQ	929	+4.7%	Outperforming
USD/KRW	1,557	+0.9%	Stable
VIX	16.6	−11.9%	Contained
US 10Y	4.42%	+0.02	Flat
Brent	$72.3	+0.4%	Stable

Regime: Korea Bear · US Bull. The 11.7 percentage-point large-cap/small-cap spread inside Korea is the clearest expression of that split. Program net selling reached −₩1.6T on the day; futures basis held at +7.89 and ETF net creation of +₩295B provided a modest offset.

Market Wrap — July 1, 2026

Tuesday’s Korea session was a study in internal divergence. KOSPI shed 7% over five days while KOSDAQ gained 4.7% over the same window. The aggregate read is risk-off; the tape underneath it was selectively constructive.

What worked. Semiconductor materials and components, HBM-adjacent names, CPO/photonics, and power-grid infrastructure all attracted buyers. Samsung Electro-Mechanics (009150.KS) was the standout in the screening universe: +1.0% on the day, +12.3% over five sessions, RS percentile 99.7, with foreign net buying of +₩114.2B and institutional net buying of +₩43.0B — price and flow in alignment. That combination is rare in a session where broad market selling dominated.

What did not. Samsung Electronics (005930.KS) faced simultaneous outflows from foreign investors (−₩1,084.1B), institutions (−₩585.4B), and programs (−₩1,419.9B). The stock closed at ₩314,500, −5.8% on the day. Recent reports of HBM4E yields above 70% support the fundamental thesis but have not yet arrested the selling pressure. SK Hynix (000660.KS) fell 3.4% on the day, with institutional selling of −₩781.7B and program outflows of −₩455.7B; foreign selling was comparatively modest at −₩18.4B.

Breadth context. Only 0.6% of the 2,749-stock universe traded above the 50-day moving average; 1.1% above the 200-day. This is not a broad market; it is a concentrated rotation into quality small-to-mid cap names inside a macro Bear regime for Korea.

Flow summary. The non-arbitrage program outflow (−₩1,462B of the −₩1,604B total) points to passive and index-linked selling rather than directional shorts. Domestic retail absorbed the bulk of large-cap supply from foreign and institutional sellers — a pattern that has historically marked the distribution phase of a large-cap cycle.

Today’s Quality Re-Rating Candidates

The meta screener ranked 89 tickers today. Two names cleared all five screeners; one additional name cleared three with a consensus revision component. The framework runs: Quality Compounder (business quality gate) → Smart Money Quality / Earnings (institutional flow confirmation) → Cycle Rerating / PEAD (earnings catalyst and drift timing).

Top Overlap Candidates

Ticker	Name	Meta Score	Screeners	Key Metrics	Caution
007660.KS	ISU Petasys	92.9	QC · SMQ · CR · SME · PEAD (5)	ROE 21.2%, OP YoY +100.9%, margin +6.7pp	RS 88.6; moderate short interest
298040.KS	Hyosung Heavy Industries	84.9	QC · SMQ · CR · SME · PEAD (5)	ROE 21.4%, OP YoY +106.1%, margin +5.1pp	5d F+I −₩5.1B; short 6.1%
402340.KS	SK Square	81.5	QC · SMQ · SME (3)	ROE 31.9%, OP YoY +124.8%, consensus up	1 DART risk-type filing
062040.KS	Sanil Electric	63.1	QC · CR · PEAD · KMS (4)	ROE 25.4%, OP YoY +30.4%, margin +2.9pp	Short 7.7%; foreign outflow
000660.KS	SK Hynix	58.7	QC · CR · PEAD (3)	ROE 35.6%, OP YoY +101.2%, margin +13.1pp	5d F+I −₩8,975.9B; retail absorbing

QC = Quality Compounder · SMQ = Smart Money Quality · CR = Cycle Rerating · SME = Smart Money Earnings · KMS = Kiwoom Market Surface

Additional 2-screener candidates: Daedeok Electronics (353200.KS), Samsung Electronics pref (005935.KS), Samsung Electronics (005930.KS), Jeju Semiconductor (080220.KQ), Wonik IPS (240810.KQ).

Top 3 in Depth

ISU Petasys (007660.KS) — Rank 1, Score 92.9

ISU Petasys makes multi-layer PCBs for AI servers and high-speed networking equipment — a direct beneficiary of hyperscaler infrastructure build-out. It is the only name today clearing all five screeners. Quality: ROE 21.2%, operating income +100.9% year-on-year, margin up 6.7 percentage points. Flow: institutional and foreign investors absorbed ₩232.7B of retail supply over recent sessions. Catalyst timing: PEAD window is open with a 52-week high gap of 17.7% and five-day return of +23.9%. Key next check: whether foreign buying is sustained (RS 88.6 sits below the 90+ threshold that marks the strongest leadership names) and how PCB order cadence tracks against AI capex disclosures.

Hyosung Heavy Industries (298040.KS) — Rank 2, Score 84.9

Hyosung Heavy Industries manufactures power transformers, switchgear, and grid infrastructure — directly exposed to both AI data center power demand and grid modernization spending. It also clears all five screeners. ROE is 21.4%, operating income grew 106.1% year-on-year, and margin expanded 5.1 percentage points. A DART single-supply-contract filing on June 23 adds a tangible catalyst on top of the screener signal. RS percentile of 93.6 places it in stronger relative strength than ISU Petasys. A mild five-day foreign+institutional outflow (−₩5.1B) and 6.1% short interest are worth monitoring but do not override the primary quality-and-flow signal.

SK Square (402340.KS) — Rank 3, Score 81.5

SK Square is a holding company with technology stakes, most notably SK Hynix. It clears Quality Compounder, Smart Money Quality, and Smart Money Earnings — the combination that flags re-rating driven by consensus revision rather than pure operating cycle. ROE of 31.9% and operating income up 124.8% year-on-year reflect semiconductor cycle tailwinds flowing through the holding structure. On June 30, DART confirmed completion of a share buyback, a shareholder return catalyst that adds to the re-rating angle. RS at 99.0 is among the highest in today’s screener universe. One risk-type DART filing also appeared; its materiality requires verification before drawing further conclusions.