Pan-Asia Catalysts/Events, Quiddity Advisors

Travis Lundy

Pan-Asia Catalysts/Events

Quiddity Advisors

Index Rebalance

Interactive Brokers Group, Inc / Index Rebalance

<ul>
<li>The S&amp;P 500 index tracks the 500 largest names listed in the US and it is one of the most highly-tracked indices in the world.</li>
<li>In this insight, we take a look at the upcoming constituent changes in the run up to the September 2025 index rebal event.</li>
<li>We expect two regular changes in September 2025 - maybe $10bn a side. There are also a couple of live M&amp;A events which are likely to trigger intra-review index changes.</li>
</ul>


The S&amp;P 500 index tracks the 500 largest names listed in the US and it is one of the most highly-tracked indices in the world.
In this insight, we take a look at the upcoming constituent changes in the run up to the September 2025 index rebal event.
We expect two regular changes in September 2025 - maybe $10bn a side. There are also a couple of live M&amp;A events which are likely to trigger intra-review index changes.


[Quiddity Index] S&P500/400/600 Sep25 Rebal: Two Possible Changes, But One Iffy

Pan-Asia Index Rebalances/ Events/ Delta One, Periscope Analytics

Brian Freitas

Pan-Asia Index Rebalances/ Events/ Delta One

Periscope Analytics

Periscope Analytics focuses on event-driven trades across Asia Pacific and provides comprehensive, timely and systematic coverage of index changes to major Asia Pacific indices in a structured manner.

The analysis includes forecasted inclusions and exclusions to all major Asian indices that have significant amount of tracking assets, including estimates of passive buy/sell flow on the stocks. The service also provides commentary and impact of market consultations, ground rule changes, and other events (IPOs, spin-offs, M&A) that could lead to index changes and passive flow.

Periscope Analytics works with multi-strategy hedge funds, proprietary trading firms, stat arb trading groups and long-only investors that invest and trade in the Asia Pacific region with the data being used to trade index rebalances, avoid pre-positioning and passive flow, and to time entry into and exit from stocks.

Event-Driven Trades Across Asia Pacific

<ul>
<li>There are 3 constituent changes for the <a href="https://www.smartkarma.com/entities/s-p-500-index" target="_blank" data-smartkarma-citation="entities:22886:1" rel="noopener">S&amp;P 500 INDEX (SPX INDEX)</a> in September. There are capping changes for the Select Sector indices and the Equal Weight Index too.</li>
<li>The round-trip trade is US$19.6bn with a big chunk from the Equal Weight Index, <a href="https://www.smartkarma.com/entities/technology-select-sector-spdr" target="_blank" data-smartkarma-citation="entities:27543:1" rel="noopener">Technology Select Sector SPDR (XLK US)</a> and <a href="https://www.smartkarma.com/entities/communication-services-select-sector-spdr-fund" target="_blank" data-smartkarma-citation="entities:27534:1" rel="noopener">Communication Services Select Sector SPDR Fund (XLC US)</a>. </li>
<li>The largest flows are expected in <a href="https://www.smartkarma.com/entities/applovin-corp" target="_blank" data-smartkarma-citation="entities:32989:1" rel="noopener">AppLovin (APP)</a>, <a href="https://www.smartkarma.com/entities/robinhood-markets-inc" target="_blank" data-smartkarma-citation="entities:33532:1" rel="noopener">Robinhood Markets (HOOD)</a>, <a href="https://www.smartkarma.com/entities/trade-desk-inc-the" target="_blank" data-smartkarma-citation="entities:26467:1" rel="noopener">Trade Desk (TTD)</a>, <a href="https://www.smartkarma.com/entities/nvidia-corp" target="_blank" data-smartkarma-citation="entities:5891:1" rel="noopener">NVIDIA (NVDA)</a>, <a href="https://www.smartkarma.com/entities/apple-inc" target="_blank" data-smartkarma-citation="entities:666:1" rel="noopener">Apple (AAPL)</a>, <a href="https://www.smartkarma.com/entities/alphabet-inc" target="_blank" data-smartkarma-citation="entities:33361:1" rel="noopener">Alphabet (GOOGL)</a>, <a href="https://www.smartkarma.com/entities/microsoft-corp" target="_blank" data-smartkarma-citation="entities:15273:1" rel="noopener">Microsoft (MSFT US)</a>, <a href="https://www.smartkarma.com/entities/exxon-mobil-corp" target="_blank" data-smartkarma-citation="entities:811:1" rel="noopener">Exxon Mobil (XOM)</a> and <a href="https://www.smartkarma.com/entities/chevron-corp" target="_blank" data-smartkarma-citation="entities:11091:1" rel="noopener">Chevron (CVX)</a>.</li>
</ul>


There are 3 constituent changes for the S&amp;P 500 INDEX (SPX INDEX) in September. There are capping changes for the Select Sector indices and the Equal Weight Index too.
The round-trip trade is US$19.6bn with a big chunk from the Equal Weight Index, Technology Select Sector SPDR (XLK US) and Communication Services Select Sector SPDR Fund (XLC US). 
The largest flows are expected in AppLovin (APP), Robinhood Markets (HOOD), Trade Desk (TTD), NVIDIA (NVDA), Apple (AAPL), Alphabet (GOOGL), Microsoft (MSFT US), Exxon Mobil (XOM) and Chevron (CVX).


Select Sector Indices and S&P Equal Weight Rebalance: Changes to Drive US$19.6bn Flow

<ul>
<li>The S&amp;P 500 index tracks the 500 largest names listed in the US and it is one of the most highly-tracked indices in the world.</li>
<li>The rankings used for the September 2025 index rebal event will be based on yesterday's (3rd September 2025) opening prices. The announcement will be made after the close on Friday.</li>
<li>In this insight, we take a look at our final expectations for ADDs/DELs (along with a tracker of all live spinoff/M&amp;A events which affect the index the next two quarters).</li>
</ul>


The S&amp;P 500 index tracks the 500 largest names listed in the US and it is one of the most highly-tracked indices in the world.
The rankings used for the September 2025 index rebal event will be based on yesterday's (3rd September 2025) opening prices. The announcement will be made after the close on Friday.
In this insight, we take a look at our final expectations for ADDs/DELs (along with a tracker of all live spinoff/M&amp;A events which affect the index the next two quarters).


[Quiddity Index] S&P500/600 Sep25 Rebal: Final Predictions

US-EU Index Rebalances / Quantitative Researcher, ORTEX

Dimitris Ioannidis

US-EU Index Rebalances / Quantitative Researcher

Global Financial Data and Analytics Platform

ORTEX

ORTEX is a global financial data and analytics platform providing real-time securities lending and short interest data, index rebalance data, holdings and insider transactions, trading signals, corporate actions and news,  stock machine learning and factor scores and other analytics. The majority of the data are downloadable and accessible through APIs.

<ul>
<li>
<a href="https://www.smartkarma.com/entities/robinhood-markets-inc" target="_blank" data-smartkarma-citation="entities:33532:1" rel="noopener">Robinhood Markets (HOOD US)</a> and <a href="https://www.smartkarma.com/entities/emcor-group-inc" target="_blank" data-smartkarma-citation="entities:20703:1" rel="noopener">Emcor Group Inc (EME US)</a> are the main candidates for addition due to consistently high eligibility scores.</li>
<li>
<a href="https://www.smartkarma.com/entities/microstrategy-inc-cl-a" target="_blank" data-smartkarma-citation="entities:14717:1" rel="noopener">Microstrategy Inc Cl A (MSTR US)</a> or <a href="https://www.smartkarma.com/entities/applovin-corp" target="_blank" data-smartkarma-citation="entities:32989:1" rel="noopener">AppLovin (APP US)</a> is forecasted to be the third addition, with sector balance acting as the limiting factor.</li>
<li>
<a href="https://www.smartkarma.com/entities/crh-plc-054117b2-cd70-470a-9efc-8f6fab2c83ec" target="_blank" data-smartkarma-citation="entities:28655:1" rel="noopener">CRH (CRH US)</a> recently regained eligibility following positive August earnings and could be a surprise addition if the tech sector is excluded.</li>
</ul>



Robinhood Markets (HOOD US) and Emcor Group Inc (EME US) are the main candidates for addition due to consistently high eligibility scores.

Microstrategy Inc Cl A (MSTR US) or AppLovin (APP US) is forecasted to be the third addition, with sector balance acting as the limiting factor.

CRH (CRH US) recently regained eligibility following positive August earnings and could be a surprise addition if the tech sector is excluded.


S&P500 September 2025 Final Forecast: HOOD, EME & 50/50 on MSTR/APP

<ul>
<li>
<a href="https://www.smartkarma.com/entities/microstrategy-inc-cl-a" target="_blank" data-smartkarma-citation="entities:14717:1" rel="noopener">Microstrategy Inc Cl A (MSTR US)</a> became eligible for inclusion in S&amp;P500 following its quarterly earnings of $10bn on 31 July.</li>
<li>
<a href="https://www.smartkarma.com/entities/robinhood-markets-inc" target="_blank" data-smartkarma-citation="entities:33532:1" rel="noopener">Robinhood Markets (HOOD US)</a>, <a href="https://www.smartkarma.com/entities/microstrategy-inc-cl-a" target="_blank" data-smartkarma-citation="entities:14717:1" rel="noopener">Microstrategy Inc Cl A (MSTR US)</a>, and <a href="https://www.smartkarma.com/entities/applovin-corp" target="_blank" data-smartkarma-citation="entities:32989:1" rel="noopener">AppLovin (APP US)</a> are the main candidates for addition from TMI at the September 2025 review.</li>
<li>
<a href="https://www.smartkarma.com/entities/interactive-brokers-group-inc" target="_blank" data-smartkarma-citation="entities:13335:1" rel="noopener">Interactive Brokers Group, Inc (IBKR US)</a> and <a href="https://www.smartkarma.com/entities/emcor-group-inc" target="_blank" data-smartkarma-citation="entities:20703:1" rel="noopener">Emcor Group Inc (EME US)</a> are the main candidates for addition from MidCap at the September 2025 review.</li>
</ul>



Microstrategy Inc Cl A (MSTR US) became eligible for inclusion in S&amp;P500 following its quarterly earnings of $10bn on 31 July.

Robinhood Markets (HOOD US), Microstrategy Inc Cl A (MSTR US), and AppLovin (APP US) are the main candidates for addition from TMI at the September 2025 review.

Interactive Brokers Group, Inc (IBKR US) and Emcor Group Inc (EME US) are the main candidates for addition from MidCap at the September 2025 review.


S&P500 September 2025 Initial Forecast: MicroStrategy (MSTR) Emerges Post-Earnings

United States

Enphase Energy Inc. manufactures solar power solutions. The Company offers solutions to increase productivity and reliability of solar modules.

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Enphase Energy (ENPH US)

[Quiddity Index] S&P500/400/600 Sep25 Rebal: Two Possible Changes, But One Iffy

We expect IBKR and possibly APP to join the S&P500 in September. We expect two deletes. MSTR has moved to second place BUT it has issues which...

Travis Lundy

Select Sector Indices and S&P Equal Weight Rebalance: Changes to Drive US$19.6bn Flow

Constituent changes to the S&P500 Index and capping changes result in a round-trip trade of US$19.6bn. AppLovin, Robinhood and Emcor will have more...

Brian Freitas

[Quiddity Index] S&P500/600 Sep25 Rebal: Final Predictions

The S&P500/400/600 Sep Rebal cutoff was decided at y/day's open. S&P500 predictions are like tilting at windmills, but we like windmills. We...

Travis Lundy

S&P500 September 2025 Final Forecast: HOOD, EME & 50/50 on MSTR/APP

HOOD and EME are the top candidates for addition with MSTR or APP forecasted as the third addition. CRH became eligible again following positive...

Dimitris Ioannidis

S&P500 September 2025 Initial Forecast: MicroStrategy (MSTR) Emerges Post-Earnings

MSTR is now eligible for S&P500 inclusion after reporting $10bn in Q2 earnings on July 31, joining HOOD, IBKR, EME and APP among the top candidates...

Dimitris Ioannidis

Price Gauge

52-week Range

Market Cap (USDm)

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Dividend (Yield)

[Quiddity Index] S&P500/400/600 Sep25 Rebal: Two Possible Changes, But One Iffy

We expect IBKR and possibly APP to join the S&P500 in September. We expect two deletes. MSTR has moved to second place BUT it has issues which...

Travis Lundy

Select Sector Indices and S&P Equal Weight Rebalance: Changes to Drive US$19.6bn Flow

Constituent changes to the S&P500 Index and capping changes result in a round-trip trade of US$19.6bn. AppLovin, Robinhood and Emcor will have more...

Brian Freitas

[Quiddity Index] S&P500/600 Sep25 Rebal: Final Predictions

The S&P500/400/600 Sep Rebal cutoff was decided at y/day's open. S&P500 predictions are like tilting at windmills, but we like windmills. We...

Travis Lundy

S&P500 September 2025 Final Forecast: HOOD, EME & 50/50 on MSTR/APP

​HOOD and EME are the top candidates for addition with MSTR or APP forecasted as the third addition. CRH became eligible again following positive...

Dimitris Ioannidis

S&P500 September 2025 Initial Forecast: MicroStrategy (MSTR) Emerges Post-Earnings

MSTR is now eligible for S&P500 inclusion after reporting $10bn in Q2 earnings on July 31, joining HOOD, IBKR, EME and APP among the top candidates...

Dimitris Ioannidis

HOOD and EME are the top candidates for addition with MSTR or APP forecasted as the third addition. CRH became eligible again following positive...