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Arka OSAT Bottleneck

0.866Residual 13.4%11 factors25 holdingsCross-check 98.7%

// WEEKLY SNAPSHOT · 2026-06-262026-07-02 (5 trading days)

A brutal week — semiconductor exposure and stock-picking overwhelmed a positive market tilt; the book fell about 13%.

The book fell about 12.8% this week, with semiconductor exposure alone accounting for a loss of roughly 11.4% — consistent with the broader Korea-driven chip deleveraging and Meta's AI-capacity news pressuring AI infrastructure names. About a third of the damage was stock-picking beyond what our factor tilts predicted; being long the market gave a small offset. Soft June payrolls eased rate pressure but didn't help the chip-heavy book this week.

Weekly return
-12.8%
Top factor adder
Market +3.0%
Top factor drag
Semiconductors -11.4%
Stock-picking share
34%
grounded: passreproduced: passreviewed: pass2 metrics

Events this week

  • 2026-06-29 South Korea unveiled a major AI/semiconductor industrial strategy anchored by Samsung Electronics and SK Hynix; market read-through was mixed as investors weighed strategic support against future memory-supply-glut risk.[1][2][3]
  • 2026-06-29 Asia risk tape was choppy after the prior Korea-led chip deleveraging shock; South Korea's KOSPI pared losses to close only slightly lower as the Korea chip plan and U.S.-Iran truce/talks steadied sentiment.[1][2][3]
  • 2026-07-01 Meta reportedly began building a cloud business to sell excess AI compute capacity; this intensified AI capex ROI / overcapacity fears and pressured AI infrastructure and neocloud-exposed names.[1][2][3]
  • 2026-07-01 Fed Chair Kevin Warsh, speaking at the ECB forum in Sintra, reiterated commitment to the Fed's 2% inflation target, emphasized independence, and pushed back against giving explicit forward guidance.[1][2][3]
  • 2026-07-02 U.S. nonfarm payrolls slowed sharply to 57k jobs in June versus roughly 110k expected; this reduced near-term Fed-hike pressure but added to growth-slowdown concerns.[1][2][3]
  • 2026-07-02 U.S. semiconductor selloff intensified: the SOX index fell roughly 5.4% for a second straight down day, with weakness across AI and memory-linked names; Nasdaq underperformed even as the Dow closed at a record.[1][2][3]
  • 2026-07-02 Fed's Daly said U.S. policy was “slightly restrictive” and the next move remained uncertain; she highlighted both persistent-inflation risk and the risk that AI investment slows if returns remain unclear.[1][2][3]
  • 2026-07-02 Korea/Asia chip deleveraging remained a key global signal: reports showed KOSPI down sharply again, with SK Hynix and Samsung Electronics under heavy pressure as leveraged ETF selling and concerns about large new memory investments amplified volatility.[1][2][3]
  • 2026-07-03 Reuters Morning Bid framed the macro tape as “soft jobs, hard choices”: weaker payrolls eased dollar/rate pressure, but chip stocks remained under pressure as investors rotated away from AI-heavy exposure.[1][2][3]
  • 2026-07-04 U.S. cash equity markets were closed for the Independence Day holiday; no new U.S. market price signal for the weekly snapshot.[1][2][3]

What moved the book this week

exact

Semiconductors (SEMI) exposure detracted about 11.4%, the single biggest hit; stock-picking (moves the factors don't explain) cost another 4.3%. Market (MKT) and other tilts added only a little back, for a total book loss of about 12.8-13.2%.

What our tilts predicted vs what actually happened

exact

Our factor tilts predicted a loss of about 8.5%; the book actually fell about 12.8% — the extra roughly 4.3%, about a third of the total move, came from stock-specific price action, not our factor bets.

This is only a 5-trading-day window, so the links drawn between events and factor moves are associations that can easily reverse next week; the exact factor-contribution and stock-picking figures themselves are precise accounting identities, not estimates.
How to read this
Stock-picking
Name-specific stock moves the factor model doesn't explain — i.e. selection, not the book's factor tilts.
Factor contribution
How much each factor exposure (e.g. Market, Semis) added to or subtracted from the week's return.
Predicted vs Actual
What the book's factor tilts implied for the week vs what it actually returned; the gap is stock-picking.
Estimate (short-sample)
A co-movement read over only ~5 trading days — directional, not statistically reliable, and may not hold.

All event-factor links below are correlations observed in a 5-trading-day window; most are not statistically significant and may reverse. Tier-1 figures are exact accounting identities.

Narrative generated by claude-opus-4-8 (effort high) on 2026-07-05T01:19:07Z — all figures machine-verified against this run’s computed results.