Russell index June reconstitution may bring significant sector and style weight changes

Overview

This report focuses on the June 2026 FTSE Russell U.S. index reconstitution, assessing potential changes in constituent migration, sector weights, and style classification across the Russell 1000, Russell 2000, Russell 3000, Russell Microcap, and Russell 1000 Growth/Value indices. The report emphasizes that this reconstitution involves a large pool of benchmarked capital and may affect the short-term performance of added, deleted, and significantly reweighted stocks.

Core views

The core views include: first, Russell 1000 additions have historically tended to outperform between the release of the preliminary list and the rebalancing, while deletions have tended to underperform; second, Capital Goods is expected to see the largest increase in representation within the Russell 1000, while Semis and Semi Equipment is still likely to remain the largest sector weight at about 17%, followed by Tech Hardware at about 10%; third, after some of the largest Russell 2000 companies migrate up to the Russell 1000, the new large-cap constituents are expected to have slower growth, lower valuations, and still around 40% loss-making companies; fourth, semiconductor weight is expected to rise significantly in Russell 1000 Growth, while tech hardware and software services weights are expected to increase in Russell 1000 Value.

Analysis framework

Based on FTSE Russell’s preliminary add/delete lists for the Russell 3000 and Russell Microcap, Goldman Sachs applies the Russell reconstitution methodology to estimate constituent changes across the indices, and further uses the Russell style methodology to estimate weight changes in Russell 1000 Growth and Russell 1000 Value. The analysis focuses on sector group weights, constituent migration, style classification changes, weight-capping constraints, and relationships with fund holdings.

Methodology notes

• Index reconstitution analysisFTSE Russell reconstitution methodology

  Estimate post-reconstitution Russell index constituent and weight changes based on the preliminary addition and deletion lists.

  The report uses FTSE Russell’s public reconstitution methodology to map the preliminary Russell 3000 and Russell Microcap lists and derive potential adjustments to the Russell 1000, Russell 2000, and related style indices.

• Style index analysisRussell style methodology

  Estimate style classification and weight changes for Russell 1000 Growth and Russell 1000 Value.

  Goldman Sachs notes that even using the Russell style methodology, precisely replicating constituent weights and regulatory caps remains challenging, creating additional uncertainty for large-weight stocks above 4.5% whose combined weight exceeds 45%.

Asset mapping & comparison

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

• Russell 1000 Index

  Core index affected by the reconstitution

  Strengths

  Historically, additions have outperformed the median constituent before rebalancing, and about 62 companies are expected to join.

  Weaknesses

  Deleted stocks may face pressure, and sector weight changes depend on the final list.

  Comparison

  Relative to the Russell 2000, the Russell 1000 absorbs some larger market-cap companies, with a high share of additions in Technology and Industrials.

  Risks

  The final constituent list, liquidity, passive fund execution timing, and market conditions may change the actual impact.

• Russell 2000 Index

  Source index for migration to the Russell 1000

  Strengths

  It still retains small-cap exposure after the reconstitution, with 237 companies expected to be added.

  Weaknesses

  After the largest constituents move up, the new largest constituents are expected to have slower growth and lower valuations.

  Comparison

  Relative to the current Russell 2000, the quality and growth characteristics of the top constituents may decline after the reconstitution.

  Risks

  Small-cap risk appetite, earnings quality, and liquidity changes may amplify index volatility.

• Russell 1000 Growth Index

  Style index that mainly benefits from higher semiconductor weights

  Strengths

  The addition of MU, SNDK, and WDC is expected to increase semiconductor sector weight by 183 basis points.

  Weaknesses

  Some large-weight stocks are affected by the 4.5% and 45% cap rules, limiting replication precision.

  Comparison

  Relative to the Value index, the Growth index is more concentrated in changes to semiconductor and large-cap growth stock weights.

  Risks

  There is high uncertainty around cap treatment for large-weight stocks such as NVDA, MSFT, GOOGL, AMZN, AAPL, and AVGO.

• Russell 1000 Value Index

  Style index with rising tech hardware and software services weights

  Strengths

  AAPL’s shift to a blended Growth/Value classification is expected to lift Tech Hardware weight, and Software & Services is also expected to increase.

  Weaknesses

  Alphabet and Advanced Micro Devices are expected to shift to 100% Growth, becoming relatively large deletions.

  Comparison

  Relative to the Growth index, this round of changes in the Value index is driven more by AAPL’s style reclassification.

  Risks

  Style classification, weight caps, and final constituent adjustments may lead to estimation errors.

• Semiconductors and Semi Equipment

  Key incremental sector in the Russell 1000 and Growth indices

  Strengths

  It is expected to remain the largest weight in the Russell 1000 and is supported in Russell 1000 Growth by the additions of MU, SNDK, and WDC.

  Weaknesses

  Some related stocks may already have been traded ahead of the event, and fund holding bases are uneven.

  Comparison

  Relative to other sectors, the increase in semiconductor weight is more prominent in the Growth index.

  Risks

  A weight increase does not necessarily mean improving fundamentals; if fund flow expectations are not met, a pullback may occur.

• Tech Hardware

  Sector with higher weight in Russell 1000 Value

  Strengths

  AAPL’s shift to a blended Growth/Value classification is expected to drive up tech hardware weight in the Value index.

  Weaknesses

  The weight change is highly dependent on the style classification of a single large-cap stock.

  Comparison

  Compared with the semiconductor change in the Growth index, the increase in tech hardware within the Value index is more driven by AAPL.

  Risks

  If AAPL’s final classification or cap treatment differs from estimates, sector weight changes will be affected.

Key data

• Reconstitution effective dateAfter the close on 2026-06-26The next FTSE Russell U.S. index reconstitution is scheduled to take effect after the market close on that date.
• List lockup periodBegins on 2026-06-08After the lockup period begins, constituent updates for the reconstitution are regarded as final.
• Related benchmark AUMApproximately $6 trillionAssets in active and passive funds benchmarked to the Russell 1000/2000/3000 and Russell 1000 Growth/Value indices.
• Active fund share71%eVestment data show that about 71% of the relevant benchmark AUM is managed by active funds.
• Expected number of Russell 1000 additions62 companiesMost are expected to come from migration out of the Russell 2000.
• Expected number of Russell 2000 additions237 companiesRussell’s preliminary results show a large number of additions to the small-cap index.
• Number of Russell 2000 deletions migrating to Russell 100043 companiesThese companies move up from the Russell 2000 to the Russell 1000.
• Russell 1000 semiconductor weightApproximately 17%Goldman Sachs expects Semis and Semi Equipment to remain the largest sector weight in the Russell 1000.
• Russell 1000 tech hardware weightApproximately 10%Expected to be the second-largest sector weight in the Russell 1000.
• Increase in Russell 1000 Growth semiconductor weight183 basis pointsMainly driven by the addition of MU, SNDK, and WDC.
• Proportion of Growth funds holding MU, SNDK, and WDC18%In Goldman Sachs’ Mutual Fundamentals fund sample, only an average of 18% of Growth mutual funds held these three stocks at the beginning of the second quarter.
• Share of loss-making companies in Russell 2000Approximately 40%The share of Russell 2000 companies with negative net profit over the past four quarters is expected to remain broadly unchanged after the reconstitution.

Impact & implications

This reconstitution may create short-term index fund flow effects and relative performance opportunities. Russell 1000 additions, stocks related to higher semiconductor weights, and increased weights for tech hardware and software services in the Value index may be affected by passive tracking and active benchmark adjustments; at the same time, deleted stocks, style deletions, and sectors with declining weights may face pressure. Because the reconstitution and style classification still involve uncertainty around the final list and weight caps, the trading impact is better դիտally observed from an event-driven and portfolio-level perspective rather than mechanically viewed as an improvement in single-stock fundamentals.

Risks

• FTSE Russell’s preliminary list is not the final list and may still be adjusted before the June 8 lockup period.
• The Russell style methodology and regulatory cap rules are difficult to fully replicate, especially for estimating the weights of large-weight stocks, which carries additional uncertainty.
• The impact of index fund flows may already have been traded in advance, and actual performance on the rebalancing date may differ from historical patterns.
• Market liquidity, securities lending constraints, and transaction costs may affect the execution of basket or event-driven trades.
• This is thematic strategy research and does not provide standalone investment advice or fundamental ratings on individual stocks.

What to watch

• Whether FTSE Russell’s final locked list after June 8 matches the preliminary list.
• The volume and price reaction of added, deleted, and heavily reweighted stocks when the reconstitution is implemented after the close on June 26.
• The impact of MU, SNDK, and WDC joining Russell 1000 Growth on semiconductor weights and fund repositioning.
• The actual impact on Tech Hardware weight in Russell 1000 Value after AAPL shifts to a blended Growth/Value classification.
• Whether large-weight Growth stocks such as NVDA, MSFT, GOOGL, AMZN, AAPL, and AVGO trigger cap constraints and how those constraints are handled.
• Whether changes in the quality of top Russell 2000 constituents and the roughly 40% share of loss-making companies affect risk appetite for the small-cap index.