Strong start to Japan's 1Q earnings season, but crowded AI trades raise pullback warnings

Overview

This issue of Japan Weekly Kickstart focuses on the progress of Japan's 1Q earnings season and summarizes key points from Goldman Sachs Japan Portfolio Strategy's Trigger Warnings report. As of July 30, 2026, early earnings disclosures from Japanese listed companies were broadly strong, with positive surprises outnumbering negative surprises and favorable earnings guidance revision momentum. However, Goldman Sachs also emphasizes that although the macro backdrop differs from the period preceding the summer 2024 sell-off, positioning, valuations, and fund flows related to AI stocks remain relatively crowded, potentially triggering greater volatility if momentum reverses.

Core views

The core views are: First, early signals from the 1Q earnings season are positive, with companies representing approximately 25% of TOPIX by market capitalization among February/March fiscal-year companies having reported results, and positive surprises at approximately 60%. Second, earnings revision momentum is strong, with the table showing upward/downward guidance revisions of 29:3 for the TOPIX sample, including 16:2 for manufacturers, 11:1 for non-manufacturers, and 2:0 for financials. Third, market risks stem from trading structure rather than fundamentals alone, with foreign inflows, margin buying, and the long-AI/short-non-AI bias all above levels before the July-August 2024 sell-off. Fourth, Goldman Sachs retains TOPIX 3/6/12-month targets of 4,200/4,300/4,500 but recommends monitoring crowded-trade pullback risks.

Analysis framework

The report combines top-down market strategy with bottom-up earnings tracking: it monitors the 1Q disclosure progress, earnings surprises, full-year recurring profit guidance revisions, and industry differences among TOPIX constituents; it also analyzes TOPIX, the Nikkei, net foreign inflows, margin buying, speculative positioning in CFTC yen futures, valuations of AI-related stocks, and market breadth to assess the risk-reward profile of Japanese equities.

Methodology notes

• Market strategyEarnings surprise and earnings revision tracking

  Compares reported company results with expectations for positive and negative surprises and calculates the ratio of upward to downward guidance revisions.

  Used to assess fundamental momentum early in the earnings season; this report shows that positive surprises are materially more prevalent than negative surprises and that guidance revisions are skewed upward.

• Portfolio riskCrowded-trade and momentum-reversal analysis

  Examines fund flows, margin buying, speculative foreign-exchange futures positioning, narrow leadership, and valuation premiums of AI-related stocks.

  Used to identify market vulnerability after a strong rally, particularly when concentrated positioning may amplify declines as trades reverse.

• Indices and thematic basketsEqual-weight liquid Japanese equity index framework

  Uses Japanese stocks with six-month average daily trading value above US$20mn as the sample to construct 45 equal-weight industry, sub-industry, and thematic indices.

  The sample comprised 271 stocks as of December 17, 2025, and the indices are refreshed annually; the same stock can enter multiple indices, and performance analysis includes the spread between the best- and worst-performing constituents.

Asset mapping & comparison

Structured mapping from thesis to named assets (strengths, weaknesses, peers, risks).

• TOPIX

  Core tracked index and target index

  Strengths

  Numerous positive 1Q earnings surprises, strong earnings revision momentum, and a Goldman Sachs 12-month target of 4,500.

  Weaknesses

  Recent performance is significantly above the July 2024 level, with part of the rally driven by a small number of stocks.

  Comparison

  Approximately 37% above the July 2024 level.

  Risks

  Foreign inflows, margin buying, and crowded thematic trading could amplify a momentum reversal.

• Nikkei 225

  Sentiment indicator for Japan's large-cap equity market

  Strengths

  The index level has risen significantly from July 2024, reflecting strong risk appetite.

  Weaknesses

  More sensitive to large-cap growth and AI-related weights.

  Comparison

  Approximately 53% above the July 2024 level.

  Risks

  If AI-related valuation premiums contract, index volatility could increase.

• AI-related Japanese stocks

  Key source of risk highlighted in the report

  Strengths

  Previously led the rally and attracted risk-seeking capital.

  Weaknesses

  Valuations are close to twice those of non-AI stocks, with crowded positioning.

  Comparison

  The report indicates that AI-related stock valuations are significantly higher relative to non-AI stocks.

  Risks

  The long-AI-winners/short-AI-losers bias could create concentrated unwinding pressure during a reversal.

• Japanese liquid equity thematic baskets

  Tool for monitoring industry and thematic performance

  Strengths

  Covers 271 Japanese stocks with six-month average daily trading value above US$20mn and tracks industries, sub-industries, and themes on an equal-weight basis.

  Weaknesses

  Coverage is limited to highly liquid stocks and cannot represent every stock in the broader market.

  Comparison

  The 45 equal-weight indices can be used to compare industry, sub-industry, and thematic performance.

  Risks

  Basket tradability is affected by market liquidity and stock-borrowing constraints.

Key data

• TOPIX4,003.30 (-0.2%)Market level shown on the report cover.
• NK22564,362.02 (-0.4%)Market level shown on the report cover.
• Reported 1Q earnings proportionApproximately 25% (by market capitalization)February/March fiscal-year companies in TOPIX, as of 2026-07-30.
• Positive/negative earnings surprisesApproximately 60% / approximately 25%Positive surprises were significantly more prevalent than negative surprises among companies that had reported.
• TOPIX guidance upgrades/downgrades29:3Number of companies with full-year recurring profit guidance revisions shown in the table.
• TOPIX targets3/6/12 months: 4,200/4,300/4,500Goldman Sachs strategy targets.
• FY26-FY28 USD/JPY assumptions162/160/155Goldman Sachs top-down forecast assumptions.
• Net foreign inflows relative to before the 2024 sell-offApproximately +20%The report says this is already above the level before the July-August 2024 sell-off.
• Margin buying balances relative to before the 2024 sell-offApproximately +35%Used in the report to flag leverage and positioning risks.

Impact & implications

For investors, short-term fundamental signals for Japanese equities remain supportive, particularly given strong earnings surprises and upward earnings revisions; however, the rally has been driven by a relatively narrow group of stocks and AI-related themes, while fund-flow and leverage indicators are elevated. This means that a reversal in the yen, interest rates, or AI-theme sentiment could trigger a rapid index pullback. Portfolio allocation should participate in earnings upside while controlling exposure to crowded trades and high-valuation themes.

Risks

• Positioning and valuations in AI-related stocks are crowded, creating momentum reversal risks.
• Net foreign inflows and margin buying balances are above levels before the July-August 2024 sell-off, potentially amplifying a pullback.
• If yen-related macro factors again create a 'perfect storm,' Japanese equities could come under pressure.
• The rally has been driven by a relatively narrow group of stocks, and insufficient breadth increases index vulnerability.
• Research disclosures warn that market prices, foreign exchange rates, and derivatives trading all involve volatility and the risk of loss of principal.

What to watch

• The proportion of TOPIX constituents reporting 1Q results, positive and negative surprises, and the direction of guidance revisions.
• Valuation premiums of AI-related stocks relative to non-AI stocks and the concentration of market leadership.
• Net buying and selling data from foreign investors, domestic institutions, and individual investors on the TSE.
• Changes in margin buying balances, margin trading, and market leverage.
• Speculative positioning in CFTC yen futures and the USD/JPY trend.
• Whether TOPIX can approach Goldman Sachs' 3/6/12-month targets of 4,200/4,300/4,500.