XLI additions & removals
Changes are observation-bounded: an addition is the first retained official snapshot containing a security after an earlier absence; a removal is its first retained absence. Baseline holdings receive no invented addition date.
Additions
| Ticker | Issuer | Observed date | Change |
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| Vertiv Holdings Co | Vertiv Holdings Co | 2026-03-31 | Added / first present |
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| Comfort Systems USA Inc | Comfort Systems USA Inc | 2025-12-31 | Added / first present |
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| EMCOR Group Inc | EMCOR Group Inc | 2025-09-30 | Added / first present |
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| Ralliant Corp | Ralliant Corp | 2025-06-30 | Added / first present |
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| Lennox International Inc | Lennox International Inc | 2024-12-31 | Added / first present |
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| Amentum Holdings Inc | Amentum Holdings Inc | 2024-09-30 | Added / first present |
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| GE Vernova Inc | GE Vernova Inc | 2024-06-30 | Added / first present |
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| Hubbell Inc | Hubbell Inc | 2023-12-31 | Added / first present |
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| Uber Technologies Inc | Uber Technologies Inc | 2023-12-31 | Added / first present |
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| Builders FirstSource Inc | Builders FirstSource Inc | 2023-12-31 | Added / first present |
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| Veralto Corp | Veralto Corp | 2023-12-31 | Added / first present |
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| Paycom Software Inc | Paycom Software Inc | 2023-06-30 | Added / first present |
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| Axon Enterprise Inc | Axon Enterprise Inc | 2023-06-30 | Added / first present |
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| Ceridian HCM Holding Inc | Ceridian HCM Holding Inc | 2023-06-30 | Added / first present |
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| Paychex Inc | Paychex Inc | 2023-03-31 | Added / first present |
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| Automatic Data Processing Inc | Automatic Data Processing Inc | 2023-03-31 | Added / first present |
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| Broadridge Financial Solutions Inc | Broadridge Financial Solutions Inc | 2023-03-31 | Added / first present |
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| GE HealthCare Technologies Inc | GE HealthCare Technologies Inc | 2023-03-31 | Added / first present |
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| CoStar Group Inc | CoStar Group Inc | 2022-09-30 | Added / first present |
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| Jacobs Solutions Inc | Jacobs Solutions Inc | 2022-09-30 | Added / first present |
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| S&P Global Inc | S&P Global Inc | 2022-03-31 | Added / first present |
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| Nordson Corp | Nordson Corp | 2022-03-31 | Added / first present |
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| General Electric Co | General Electric Co | 2021-09-30 | Added / first present |
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| Leidos Holdings Inc | Leidos Holdings Inc | 2021-03-31 | Added / first present |
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| Generac Holdings Inc | Generac Holdings Inc | 2021-03-31 | Added / first present |
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| State Street Global Advisors | State Street Global Advisors | 2020-09-30 | Added / first present |
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| Teledyne Technologies Inc | Teledyne Technologies Inc | 2020-06-30 | Added / first present |
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| Raytheon Technologies Corp | Raytheon Technologies Corp | 2020-06-30 | Added / first present |
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| Otis Worldwide Corp | Otis Worldwide Corp | 2020-06-30 | Added / first present |
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| Carrier Global Corp | Carrier Global Corp | 2020-06-30 | Added / first present |
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| Howmet Aerospace Inc | Howmet Aerospace Inc | 2020-06-30 | Added / first present |
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| Ingersoll Rand Inc | Ingersoll Rand Inc | 2020-03-31 | Added / first present |
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| Old Dominion Freight Line Inc | Old Dominion Freight Line Inc | 2019-12-31 | Added / first present |
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Removals
| Ticker | Issuer | Observed date | Change |
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| Ralliant Corp | Ralliant Corp | 2025-09-30 | Removed / first absent |
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| Amentum Holdings Inc | Amentum Holdings Inc | 2024-12-31 | Removed / first absent |
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| Paycom Software Inc | Paycom Software Inc | 2026-03-31 | Removed / first absent |
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| Ceridian HCM Holding Inc | Ceridian HCM Holding Inc | 2026-03-31 | Removed / first absent |
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| GE HealthCare Technologies Inc | GE HealthCare Technologies Inc | 2023-09-30 | Removed / first absent |
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| CoStar Group Inc | CoStar Group Inc | 2023-06-30 | Removed / first absent |
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| S&P Global Inc | S&P Global Inc | 2022-12-31 | Removed / first absent |
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| Teledyne Technologies Inc | Teledyne Technologies Inc | 2021-09-30 | Removed / first absent |
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| Raytheon Co | Raytheon Co | 2020-06-30 | Removed / first absent |
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| Jacobs Engineering Group Inc | Jacobs Engineering Group Inc | 2022-09-30 | Removed / first absent |
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| Robert Half International Inc | Robert Half International Inc | 2024-06-30 | Removed / first absent |
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| United Technologies Corp | United Technologies Corp | 2020-06-30 | Removed / first absent |
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| General Electric Co | General Electric Co | 2021-09-30 | Removed / first absent |
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| Roper Technologies Inc | Roper Technologies Inc | 2022-06-30 | Removed / first absent |
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| Kansas City Southern Railway Co/The | Kansas City Southern Railway Co/The | 2021-12-31 | Removed / first absent |
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| Arconic Inc | Arconic Inc | 2020-06-30 | Removed / first absent |
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| State Street Global Advisors | State Street Global Advisors | 2020-06-30 | Removed / first absent |
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| Alaska Air Group Inc | Alaska Air Group Inc | 2023-12-31 | Removed / first absent |
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| American Airlines Group Inc | American Airlines Group Inc | 2024-09-30 | Removed / first absent |
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| Fortune Brands Home & Security Inc | Fortune Brands Home & Security Inc | 2022-12-31 | Removed / first absent |
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| Flowserve Corp | Flowserve Corp | 2021-03-31 | Removed / first absent |
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| State Street Global Advisors | State Street Global Advisors | 2024-09-30 | Removed / first absent |
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