XES 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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| Oil States International Inc | Oil States International Inc | 2026-03-31 | Added / first present |
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| Forum Energy Technologies Inc | Forum Energy Technologies Inc | 2026-03-31 | Added / first present |
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| Flowco Holdings Inc | Flowco Holdings Inc | 2026-03-31 | Added / first present |
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| Aris Water Solutions Inc | Aris Water Solutions Inc | 2025-03-31 | Added / first present |
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| Solaris Energy Infrastructure Inc | Solaris Energy Infrastructure Inc | 2024-12-31 | Added / first present |
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| Innovex International Inc | Innovex International Inc | 2024-09-30 | Added / first present |
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| Kodiak Gas Services Inc | Kodiak Gas Services Inc | 2024-03-31 | Added / first present |
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| Newpark Resources Inc | Newpark Resources Inc | 2023-12-31 | Added / first present |
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| Atlas Energy Solutions Inc | Atlas Energy Solutions Inc | 2023-12-31 | Added / first present |
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| TETRA Technologies Inc | TETRA Technologies Inc | 2023-09-30 | Added / first present |
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| Schlumberger NV | Schlumberger NV | 2023-06-30 | Added / first present |
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| Core Laboratories Inc | Core Laboratories Inc | 2023-06-30 | Added / first present |
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| Diamond Offshore Drilling Inc | Diamond Offshore Drilling Inc | 2022-09-30 | Added / first present |
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| ProFrac Holding Corp | ProFrac Holding Corp | 2022-09-30 | Added / first present |
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| Schlumberger NV | Schlumberger NV | 2022-03-31 | Added / first present |
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| Select Energy Services Inc | Select Energy Services Inc | 2022-03-31 | Added / first present |
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| RPC Inc | RPC Inc | 2022-03-31 | Added / first present |
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| State Street Global Advisors | State Street Global Advisors | 2021-09-30 | Added / first present |
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| TETRA Technologies Inc | TETRA Technologies Inc | 2021-06-30 | Added / first present |
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| US Silica Holdings Inc | US Silica Holdings Inc | 2021-03-31 | Added / first present |
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| Oil States International Inc | Oil States International Inc | 2021-03-31 | Added / first present |
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| NOV Inc | NOV Inc | 2021-03-31 | Added / first present |
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| Tidewater Inc | Tidewater Inc | 2020-12-31 | Added / first present |
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| Aspen Aerogels Inc | Aspen Aerogels Inc | 2020-12-31 | Added / first present |
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| Bristow Group Inc | Bristow Group Inc | 2020-12-31 | Added / first present |
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| ChampionX Corp | ChampionX Corp | 2020-06-30 | Added / first present |
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| NexTier Oilfield Solutions Inc | NexTier Oilfield Solutions Inc | 2019-12-31 | Added / first present |
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Removals
| Ticker | Issuer | Observed date | Change |
|---|
| Aris Water Solutions Inc | Aris Water Solutions Inc | 2025-12-31 | Removed / first absent |
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| Newpark Resources Inc | Newpark Resources Inc | 2025-06-30 | Removed / first absent |
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| Diamond Offshore Drilling Inc | Diamond Offshore Drilling Inc | 2024-09-30 | Removed / first absent |
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| ProFrac Holding Corp | ProFrac Holding Corp | 2023-09-30 | Removed / first absent |
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| Schlumberger NV | Schlumberger NV | 2022-12-31 | Removed / first absent |
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| TETRA Technologies Inc | TETRA Technologies Inc | 2023-06-30 | Removed / first absent |
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| US Silica Holdings Inc | US Silica Holdings Inc | 2024-09-30 | Removed / first absent |
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| Oil States International Inc | Oil States International Inc | 2024-06-30 | Removed / first absent |
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| Aspen Aerogels Inc | Aspen Aerogels Inc | 2022-03-31 | Removed / first absent |
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| ChampionX Corp | ChampionX Corp | 2025-09-30 | Removed / first absent |
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| NexTier Oilfield Solutions Inc | NexTier Oilfield Solutions Inc | 2023-09-30 | Removed / first absent |
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| Schlumberger Ltd | Schlumberger Ltd | 2019-12-31 | Removed / first absent |
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| National Oilwell Varco Inc | National Oilwell Varco Inc | 2021-03-31 | Removed / first absent |
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| State Street Global Advisors | State Street Global Advisors | 2021-06-30 | Removed / first absent |
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| Solaris Oilfield Infrastructure Inc | Solaris Oilfield Infrastructure Inc | 2020-06-30 | 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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| Select Energy Services Inc | Select Energy Services Inc | 2020-12-31 | Removed / first absent |
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| Apergy Corp | Apergy Corp | 2020-06-30 | Removed / first absent |
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| Dril-Quip Inc | Dril-Quip Inc | 2024-09-30 | Removed / first absent |
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| McDermott International Inc | McDermott International Inc | 2019-12-31 | Removed / first absent |
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| Newpark Resources Inc | Newpark Resources Inc | 2020-06-30 | Removed / first absent |
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| Matrix Service Co | Matrix Service Co | 2020-12-31 | Removed / first absent |
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| DMC Global Inc | DMC Global Inc | 2024-06-30 | Removed / first absent |
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| US Silica Holdings Inc | US Silica Holdings Inc | 2020-06-30 | Removed / first absent |
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| SEACOR Holdings Inc | SEACOR Holdings Inc | 2020-12-31 | Removed / first absent |
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| Oil States International Inc | Oil States International Inc | 2020-06-30 | Removed / first absent |
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| C&J Energy Services Inc | C&J Energy Services Inc | 2019-12-31 | Removed / first absent |
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| Exterran Corp | Exterran Corp | 2019-12-31 | Removed / first absent |
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| Diamond Offshore Drilling Inc | Diamond Offshore Drilling Inc | 2020-06-30 | Removed / first absent |
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| RPC Inc | RPC Inc | 2019-12-31 | Removed / first absent |
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| Tidewater Inc | Tidewater Inc | 2020-06-30 | Removed / first absent |
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