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

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Finimize Research

Independent in-depth research from Finimize

Finimize

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Thematic (Sector/Industry)

<ul>
<li>The US economy’s resilience hasn’t come from the many – it’s come from the top 10% as the “wealth effect” from rising asset prices has boosted spending.</li>
<li>But it works in reverse too.  Since the richest make up nearly half of America’s consumer spending, that could lead to a serious economic fallout.</li>
<li>It’s worth considering protecting your portfolio. I’ve pulled together one list of companies that should do well and another that could suffer from the change in climate.</li>
</ul>


The US economy’s resilience hasn’t come from the many – it’s come from the top 10% as the “wealth effect” from rising asset prices has boosted spending.
But it works in reverse too.  Since the richest make up nearly half of America’s consumer spending, that could lead to a serious economic fallout.
It’s worth considering protecting your portfolio. I’ve pulled together one list of companies that should do well and another that could suffer from the change in climate.


A Defensive Portfolio Prepared For The Wealth Effect’s Reversal

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/crh-plc-054117b2-cd70-470a-9efc-8f6fab2c83ec" target="_blank" data-smartkarma-citation="entities:28655:1" rel="noopener">CRH (CRH US)</a> and <a href="https://www.smartkarma.com/entities/comfort-systems-usa-inc" target="_blank" data-smartkarma-citation="entities:6730:1" rel="noopener">Comfort Systems USA (FIX US)</a> are the main candidates for addition due to consistently high eligibility scores.</li>
<li>
<a href="https://www.smartkarma.com/entities/pure-storage-inc" target="_blank" data-smartkarma-citation="entities:27421:1" rel="noopener">Pure Storage Inc (PSTG US)</a> and <a href="https://www.smartkarma.com/entities/solstice-advanced-materials" target="_blank" data-smartkarma-citation="entities:45953:1" rel="noopener">Solstice Advanced Materials (SOLS US)</a> face reduced conviction due to sector balance and turnover.</li>
<li>
<a href="https://www.smartkarma.com/entities/vertiv-holdings-co" target="_blank" data-smartkarma-citation="entities:33140:1" rel="noopener">Vertiv Holdings Co (VRT US)</a> has a higher probability of inclusion following the acquisition of <a href="https://www.smartkarma.com/entities/kellogg-co" target="_blank" data-smartkarma-citation="entities:16090:1" rel="noopener">Kellogg Co (K US)</a> which is still pending.</li>
</ul>



CRH (CRH US) and Comfort Systems USA (FIX US) are the main candidates for addition due to consistently high eligibility scores.

Pure Storage Inc (PSTG US) and Solstice Advanced Materials (SOLS US) face reduced conviction due to sector balance and turnover.

Vertiv Holdings Co (VRT US) has a higher probability of inclusion following the acquisition of Kellogg Co (K US) which is still pending.


S&P500 December 2025 Final Forecast: FIX & CRH Leading the Pack

Alnylam Pharmaceuticals / Index Rebalance

<ul>
<li>
<a href="https://www.smartkarma.com/entities/alnylam-pharmaceuticals-inc" target="_blank" data-smartkarma-citation="entities:2191:1" rel="noopener">Alnylam Pharmaceuticals (ALNY US)</a> just became eligible for S&amp;P500 following positive earnings released on 30 October 2025.</li>
<li>The company's market cap and other eligibility metrics are estimated to place it among the top 5 addition candidates for S&amp;P500 with a higher chance of inclusion in 2026.</li>
<li>Top 3 addition candidates for S&amp;P500 are <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</a>, <a href="https://www.smartkarma.com/entities/comfort-systems-usa-inc" target="_blank" data-smartkarma-citation="entities:6730:1" rel="noopener">FIX</a> and <a href="https://www.smartkarma.com/entities/pure-storage-inc" target="_blank" data-smartkarma-citation="entities:27421:1" rel="noopener">PSTG</a> with the next inclusion expected by the end of November following the Omnicom-Interpublic $13bn acquisition.</li>
</ul>



Alnylam Pharmaceuticals (ALNY US) just became eligible for S&amp;P500 following positive earnings released on 30 October 2025.
The company's market cap and other eligibility metrics are estimated to place it among the top 5 addition candidates for S&amp;P500 with a higher chance of inclusion in 2026.
Top 3 addition candidates for S&amp;P500 are CRH, FIX and PSTG with the next inclusion expected by the end of November following the Omnicom-Interpublic $13bn acquisition.


Alnylam Pharmaceuticals (ALNY US): On Track for S&P500 Inclusion Following Positive Earnings

<ul>
<li>The SP 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 December 2025 index rebal event.</li>
<li>We expect two regular changes in December 2025. There are also multiple live M&amp;A events which are likely to trigger intra-review index changes.</li>
</ul>


The SP 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 December 2025 index rebal event.
We expect two regular changes in December 2025. There are also multiple live M&amp;A events which are likely to trigger intra-review index changes.


[Quiddity Index] SP500/600 Dec25 Rebal: Two ADDs Two DELs and 3 Intra-Review Changes Likely Soon

United States

Omnicom Group Inc. provides advertising, marketing and corporate communications services. The Company's agencies, which operate in major markets around the world, provide a comprehensive range of services including traditional media advertising; customer relationship management ("CRM"); public relations; and specialty communications.

Price Gauge
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Omnicom Group (OMC 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

A Defensive Portfolio Prepared For The Wealth Effect’s Reversal

The top 10% account for around 50% of consumer spending in the US. This insight looks at the sectors and companies that could win and lose from the...

Finimize Research

S&P500 December 2025 Final Forecast: FIX & CRH Leading the Pack

CRH and FIX are top candidates for addition in December 2025, while PSTG and SOLS face reduced conviction. VRT has a higher chance of inclusion...

Dimitris Ioannidis

Alnylam Pharmaceuticals (ALNY US): On Track for S&P500 Inclusion Following Positive Earnings

After several extensions, Omnicom and IPG have just confirmed that the European Commission has granted antitrust approval for the acquisition,...

Dimitris Ioannidis

[Quiddity Index] SP500/600 Dec25 Rebal: Two ADDs Two DELs and 3 Intra-Review Changes Likely Soon

SP500 could see two changes in Dec25. One has a lot to buy if chosen. There are also a few intra-review actions/changes scheduled for the near...

Travis Lundy

Price Gauge

52-week Range

Market Cap (USDm)

P/E

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

A Defensive Portfolio Prepared For The Wealth Effect’s Reversal

The top 10% account for around 50% of consumer spending in the US. This insight looks at the sectors and companies that could win and lose from the...

Finimize Research

S&P500 December 2025 Final Forecast: FIX & CRH Leading the Pack

​CRH and FIX are top candidates for addition in December 2025, while PSTG and SOLS face reduced conviction. VRT has a higher chance of inclusion...

Dimitris Ioannidis

Alnylam Pharmaceuticals (ALNY US): On Track for S&P500 Inclusion Following Positive Earnings

After several extensions, Omnicom and IPG have just confirmed that the European Commission has granted antitrust approval for the acquisition,...

Dimitris Ioannidis

[Quiddity Index] SP500/600 Dec25 Rebal: Two ADDs Two DELs and 3 Intra-Review Changes Likely Soon

SP500 could see two changes in Dec25. One has a lot to buy if chosen. There are also a few intra-review actions/changes scheduled for the near...

Travis Lundy

CRH and FIX are top candidates for addition in December 2025, while PSTG and SOLS face reduced conviction. VRT has a higher chance of inclusion...