US-EU Index Rebalances / Quantitative Researcher

Dimitris Ioannidis

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.

Index Rebalance

<ul>
<li>
<a href="https://www.smartkarma.com/entities/seagate-technology-holdings-pl" target="_blank" data-smartkarma-citation="entities:9129:1" rel="noopener">Seagate Technology (STX US)</a>, <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> and <a href="https://www.smartkarma.com/entities/western-digital-corp" target="_blank" data-smartkarma-citation="entities:1094:1" rel="noopener">Western Digital (WDC US)</a> are the top forecasted additions with the highest price surge.</li>
<li>
<a href="https://www.smartkarma.com/entities/trade-desk-inc-the" target="_blank" data-smartkarma-citation="entities:26467:1" rel="noopener">Trade Desk (TTD US)</a>, <a href="https://www.smartkarma.com/entities/on-semiconductor-corp" target="_blank" data-smartkarma-citation="entities:2729:1" rel="noopener">On Semiconductor (ON US)</a> and <a href="https://www.smartkarma.com/entities/lululemon-athletica-inc" target="_blank" data-smartkarma-citation="entities:8316:1" rel="noopener">Lululemon Athletica (LULU US)</a> are the forecasted deletions with the largest price drop.</li>
<li>
<a href="https://www.smartkarma.com/entities/ferrovial-se-d1237de2-ee34-4fbb-8db7-53dd686904f2" target="_blank" data-smartkarma-citation="entities:46086:1" rel="noopener">Ferrovial (FER US)</a> can be a surprise addition depending on the treatment of its foreign listing.</li>
</ul>



Seagate Technology (STX US), Alnylam Pharmaceuticals (ALNY US) and Western Digital (WDC US) are the top forecasted additions with the highest price surge.

Trade Desk (TTD US), On Semiconductor (ON US) and Lululemon Athletica (LULU US) are the forecasted deletions with the largest price drop.

Ferrovial (FER US) can be a surprise addition depending on the treatment of its foreign listing.


Nasdaq100 December 2025 Forecast (Final): 12 Changes

<ul>
<li>
<a href="https://www.smartkarma.com/entities/marvell-technology-inc" target="_blank" data-smartkarma-citation="entities:15837:1" rel="noopener">Marvell Technology (MRVL US)</a> became eligible at the last minute for S&amp;P500 inclusion in the December 2025 review, following positive Q3 earnings.</li>
<li>
<a href="https://www.smartkarma.com/entities/marvell-technology-inc" target="_blank" data-smartkarma-citation="entities:15837:1" rel="noopener">Marvell Technology (MRVL US)</a> experienced a significant turnaround in profitability in the last year, but its latest earnings are driven by non-operational activity.</li>
<li>The company's market cap and other eligibility metrics are estimated to place it among the top addition candidates for S&amp;P500 with a higher chance of inclusion in 2026.</li>
</ul>



Marvell Technology (MRVL US) became eligible at the last minute for S&amp;P500 inclusion in the December 2025 review, following positive Q3 earnings.

Marvell Technology (MRVL US) experienced a significant turnaround in profitability in the last year, but its latest earnings are driven by non-operational activity.
The company's market cap and other eligibility metrics are estimated to place it among the top addition candidates for S&amp;P500 with a higher chance of inclusion in 2026.


Marvell Technology (MRVL US): Heroic Earnings Unlock S&P500 Eligibility

Index Rebalance and Special Situations Coverage, Quiddity Advisors

Anjana Amarasuriya

Index Rebalance and Special Situations Coverage

Quiddity Advisors

Pan-Asia Catalysts/Events

<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>The index changes for the December 2025 rebal will be based on the open of 3rd December 2025 and announced after the close of 5th December 2025.</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.The index changes for the December 2025 rebal will be based on the open of 3rd December 2025 and announced after the close of 5th December 2025.

Quiddity Leaderboard SP500/600 Dec25 Rebal: Last Minute Surprise in The Leading Names

<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

Pan-Asia Catalysts/Events, Quiddity Advisors

Travis Lundy

<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

Alnylam Pharmaceuticals Inc. is an early-stage therapeutics company. The Company is developing technology that can specifically and potently silence disease-causing genes.

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Alnylam Pharmaceuticals (ALNY US)

Nasdaq100 December 2025 Forecast (Final): 12 Changes

STX, ALNY, WDC are the top forecasted addition. TTD, ON, LULU are the top forecasted deletions. FER can be a surprise addition displacing EBAY.

Dimitris Ioannidis

Marvell Technology (MRVL US): Heroic Earnings Unlock S&P500 Eligibility

MRVL is labelled bullish for index rebalance but bearish in fundamentals following the fourth consecutive positive earnings and high price-to...

Dimitris Ioannidis

Quiddity Leaderboard SP500/600 Dec25 Rebal: Last Minute Surprise in The Leading Names

SP500 rankings will be decided at today's open and announced on 5 December after the close. We see $100bn to trade across the SP500 complex. Kalshi...

Anjana Amarasuriya

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

[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)

Nasdaq100 December 2025 Forecast (Final): 12 Changes

​STX, ALNY, WDC are the top forecasted addition. TTD, ON, LULU are the top forecasted deletions. FER can be a surprise addition displacing EBAY.

Dimitris Ioannidis

Marvell Technology (MRVL US): Heroic Earnings Unlock S&P500 Eligibility

MRVL is labelled bullish for index rebalance but bearish in fundamentals following the fourth consecutive positive earnings and high price-to...

Dimitris Ioannidis

Quiddity Leaderboard SP500/600 Dec25 Rebal: Last Minute Surprise in The Leading Names

SP500 rankings will be decided at today's open and announced on 5 December after the close. We see $100bn to trade across the SP500 complex. Kalshi...

Anjana Amarasuriya

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

[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

STX, ALNY, WDC are the top forecasted addition. TTD, ON, LULU are the top forecasted deletions. FER can be a surprise addition displacing EBAY.

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...