{
  "schema_version": 1,
  "description": "S&P 500 constituents removed while the prod.sqlite snapshot window was open. Input to scripts/prep_survivorship_snapshot.py, which restores their price history into the arm B snapshot copy. Curated, not generated at run time.",
  "source": {
    "url": "https://en.wikipedia.org/wiki/Historical_components_of_the_S%26P_500",
    "table": "Selected changes to the list of S&P 500 components",
    "retrieved_on": "2026-09-07",
    "note": "reason_text is copied from the source row. Everything under 'evidence' was measured against Alpaca daily bars on the same date, and review_flags are derived from disagreements between the two."
  },
  "window": {
    "start": "2021-06-24",
    "end": "2026-07-02",
    "basis": "the OHLCV date range of backtest_snapshots/prod.sqlite"
  },
  "reviewed_cutoffs": {
    "note": "Explicit, reviewed last-real-bar dates. The prep script truncates ONLY these symbols. Everywhere else a run of 5 or more consecutive zero-volume sessions is a flag: the symbol is left out of the arm and reported for review rather than silently cut.",
    "why_needed": "Alpaca freezes a halted symbol at its last price with zero volume instead of ending the series. Those bars are fabricated, and where a ticker is later reused they bridge two different companies with no date gap for a gap check to find.",
    "cutoffs": [
      {
        "symbol": "SBNY",
        "last_real_bar": "2023-03-10",
        "observed": "509 sessions frozen at 70.00 with zero volume, 2023-03-13 to 2025-03-21",
        "why": "Signature Bank was closed on 2023-03-12, so no session after 2023-03-10 is a real trade in this security.",
        "source": "https://www.fdic.gov/news/press-releases/2023/pr23021.html"
      },
      {
        "symbol": "INFO",
        "last_real_bar": "2022-02-25",
        "observed": "1090 sessions frozen at 108.61 with zero volume from 2022-02-28; a different listing later trades under INFO (28.29 in 2026)",
        "why": "S&P Global completed its acquisition of IHS Markit in February 2022. Bars after 2022-02-25 are first fabricated and then a different company, so only the earlier bars belong to the removed constituent.",
        "source": "https://en.wikipedia.org/wiki/Historical_components_of_the_S%26P_500"
      }
    ]
  },
  "corporate_action_caveats": [
    {
      "symbol": "FBIN",
      "event": "Fortune Brands Home & Security distributed MasterBrand (one MBC share per FBHS share, distribution completed 2022-12-14) and began trading as Fortune Brands Innovations under FBIN on 2022-12-15.",
      "sources": [
        "https://www.sec.gov/Archives/edgar/data/1519751/000119312522306146/d420098dex991.htm",
        "https://www.fbin.com/investors/separation-updates/"
      ],
      "caveat": "Alpaca's split adjustment does not adjust for spin-offs, so the distribution shows up as a real -6.91% close-to-close move on 2022-12-15 (63.22 on 12-13, 61.90 on 12-14, 57.62 on 12-15). A holder did not lose that value - they received MBC shares - but any signal or stop computed across that date reads it as a price decline. MBC enters this dataset separately with its first bar on 2022-12-15."
    }
  ],
  "terminal_confirmation_policy": "The FDIC sources below confirm the closure EVENT. They do not by themselves establish what holders of the listed security ultimately recovered. The terminal bar is therefore an explicit near-total-loss assumption applied to a position still open at the halt - not an observed closing-day execution. A mark is written only when the retained final bar equals the reviewed last_real_bar below.",
  "terminal_confirmations": [
    {
      "symbol": "SIVB",
      "company": "SVB Financial Group",
      "event": "Silicon Valley Bank closed by the California DFPI on 2023-03-10; FDIC appointed receiver",
      "source": "https://www.fdic.gov/news/press-releases/2023/pr23019.html",
      "last_real_bar": "2023-03-09",
      "last_real_close": 106.04,
      "basis": "The listed security was the holding company, whose principal operating subsidiary the receivership took. The exchange bars stop at 106.04 and never show what followed, so a near-total loss is assumed rather than observed.",
      "assumption": "explicit near-total-loss assumption; recovery to holders is not evidenced here",
      "confirmed": true
    },
    {
      "symbol": "SBNY",
      "company": "Signature Bank",
      "event": "Signature Bank closed by the New York DFS on 2023-03-12; FDIC appointed receiver",
      "source": "https://www.fdic.gov/news/press-releases/2023/pr23021.html",
      "last_real_bar": "2023-03-10",
      "last_real_close": 70.0,
      "basis": "The listed security was the bank itself. Trading stops after 2023-03-10 and Alpaca then freezes the price for 509 sessions, so nothing after that date is an observed price.",
      "assumption": "explicit near-total-loss assumption; recovery to holders is not evidenced here",
      "confirmed": true
    },
    {
      "symbol": "FRC",
      "company": "First Republic Bank",
      "event": "First Republic Bank closed by the California DFPI on 2023-05-01; FDIC appointed receiver and JPMorgan Chase assumed all deposits",
      "source": "https://www.fdic.gov/news/press-releases/2023/pr23034.html",
      "last_real_bar": "2023-04-28",
      "last_real_close": 3.51,
      "basis": "The listed security was the bank itself. The last exchange bar is 3.51, so the assumption only removes the final few percent - most of the decline is already in the real bars.",
      "assumption": "explicit near-total-loss assumption; recovery to holders is not evidenced here",
      "confirmed": true
    }
  ],
  "removals": [
    {
      "symbol": "CAG",
      "name": "Conagra Brands",
      "removed_on": "2026-06-30",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": null,
      "evidence": {
        "in_base_snapshot": true,
        "alpaca_bars_in_window": null,
        "bars_kept_after_truncation": null,
        "first_bar": null,
        "effective_last_bar": null,
        "effective_last_close": null,
        "effective_last_minus_removal_days": null
      },
      "review_flags": [
        "already present in the base snapshot; nothing to restore"
      ]
    },
    {
      "symbol": "POOL",
      "name": "Pool Corporation",
      "removed_on": "2026-06-22",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": null,
      "evidence": {
        "in_base_snapshot": true,
        "alpaca_bars_in_window": null,
        "bars_kept_after_truncation": null,
        "first_bar": null,
        "effective_last_bar": null,
        "effective_last_close": null,
        "effective_last_minus_removal_days": null
      },
      "review_flags": [
        "already present in the base snapshot; nothing to restore"
      ]
    },
    {
      "symbol": "CPB",
      "name": "Campbell's",
      "removed_on": "2026-06-22",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": null,
      "evidence": {
        "in_base_snapshot": true,
        "alpaca_bars_in_window": null,
        "bars_kept_after_truncation": null,
        "first_bar": null,
        "effective_last_bar": null,
        "effective_last_close": null,
        "effective_last_minus_removal_days": null
      },
      "review_flags": [
        "already present in the base snapshot; nothing to restore"
      ]
    },
    {
      "symbol": "EPAM",
      "name": "EPAM Systems",
      "removed_on": "2026-06-02",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": null,
      "evidence": {
        "in_base_snapshot": true,
        "alpaca_bars_in_window": null,
        "bars_kept_after_truncation": null,
        "first_bar": null,
        "effective_last_bar": null,
        "effective_last_close": null,
        "effective_last_minus_removal_days": null
      },
      "review_flags": [
        "already present in the base snapshot; nothing to restore"
      ]
    },
    {
      "symbol": "CTRA",
      "name": "Coterra Energy",
      "removed_on": "2026-05-07",
      "reason": "acquisition",
      "reason_text": "Devon Energy acquired Coterra Energy.",
      "restore_symbol": null,
      "evidence": {
        "in_base_snapshot": true,
        "alpaca_bars_in_window": null,
        "bars_kept_after_truncation": null,
        "first_bar": null,
        "effective_last_bar": null,
        "effective_last_close": null,
        "effective_last_minus_removal_days": null
      },
      "review_flags": [
        "already present in the base snapshot; nothing to restore"
      ]
    },
    {
      "symbol": "HOLX",
      "name": "Hologic",
      "removed_on": "2026-04-09",
      "reason": "acquisition",
      "reason_text": "Blackstone Inc. and TPG Inc. acquired Hologic.",
      "restore_symbol": "HOLX",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1200,
        "bars_kept_after_truncation": 1200,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-04-06",
        "effective_last_close": 76.01,
        "effective_last_minus_removal_days": -3
      },
      "review_flags": []
    },
    {
      "symbol": "MTCH",
      "name": "Match Group",
      "removed_on": "2026-03-23",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "MTCH",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 37.9,
        "effective_last_minus_removal_days": 101
      },
      "review_flags": []
    },
    {
      "symbol": "MOH",
      "name": "Molina Healthcare",
      "removed_on": "2026-03-23",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "MOH",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 229.87,
        "effective_last_minus_removal_days": 101
      },
      "review_flags": []
    },
    {
      "symbol": "LW",
      "name": "Lamb Weston",
      "removed_on": "2026-03-23",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "LW",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 45.91,
        "effective_last_minus_removal_days": 101
      },
      "review_flags": []
    },
    {
      "symbol": "PAYC",
      "name": "Paycom",
      "removed_on": "2026-03-23",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "PAYC",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 139.21,
        "effective_last_minus_removal_days": 101
      },
      "review_flags": []
    },
    {
      "symbol": "DAY",
      "name": "Dayforce",
      "removed_on": "2026-02-09",
      "reason": "acquisition",
      "reason_text": "Thoma Bravo L.P. acquired Dayforce.",
      "restore_symbol": "DAY",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 503,
        "bars_kept_after_truncation": 503,
        "first_bar": "2024-02-01",
        "effective_last_bar": "2026-02-03",
        "effective_last_close": 69.86,
        "effective_last_minus_removal_days": -6
      },
      "review_flags": []
    },
    {
      "symbol": "LKQ",
      "name": "LKQ Corporation",
      "removed_on": "2025-12-22",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "LKQ",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 26.55,
        "effective_last_minus_removal_days": 192
      },
      "review_flags": []
    },
    {
      "symbol": "SOLS",
      "name": "Solstice Advanced Materials",
      "removed_on": "2025-12-22",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "SOLS",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 176,
        "bars_kept_after_truncation": 176,
        "first_bar": "2025-10-20",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 80.19,
        "effective_last_minus_removal_days": 192
      },
      "review_flags": []
    },
    {
      "symbol": "MHK",
      "name": "Mohawk Industries",
      "removed_on": "2025-12-22",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "MHK",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 119.35,
        "effective_last_minus_removal_days": 192
      },
      "review_flags": []
    },
    {
      "symbol": "K",
      "name": "Kellanova",
      "removed_on": "2025-12-11",
      "reason": "acquisition",
      "reason_text": "Mars Inc. acquired Kellanova.",
      "restore_symbol": "K",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1122,
        "bars_kept_after_truncation": 1122,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2025-12-10",
        "effective_last_close": 83.44,
        "effective_last_minus_removal_days": -1
      },
      "review_flags": []
    },
    {
      "symbol": "IPG",
      "name": "Interpublic Group",
      "removed_on": "2025-11-28",
      "reason": "acquisition",
      "reason_text": "Omnicom Group acquired The Interpublic Group of Companies.",
      "restore_symbol": "IPG",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1113,
        "bars_kept_after_truncation": 1113,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2025-11-26",
        "effective_last_close": 24.57,
        "effective_last_minus_removal_days": -2
      },
      "review_flags": []
    },
    {
      "symbol": "EMN",
      "name": "Eastman Chemical Co.",
      "removed_on": "2025-11-04",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "EMN",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 68.86,
        "effective_last_minus_removal_days": 240
      },
      "review_flags": []
    },
    {
      "symbol": "KMX",
      "name": "CarMax",
      "removed_on": "2025-10-31",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "KMX",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 50.98,
        "effective_last_minus_removal_days": 244
      },
      "review_flags": []
    },
    {
      "symbol": "ENPH",
      "name": "Enphase Energy",
      "removed_on": "2025-09-22",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "ENPH",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 43.07,
        "effective_last_minus_removal_days": 283
      },
      "review_flags": []
    },
    {
      "symbol": "CZR",
      "name": "Caesars Entertainment",
      "removed_on": "2025-09-22",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "CZR",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 30.39,
        "effective_last_minus_removal_days": 283
      },
      "review_flags": []
    },
    {
      "symbol": "MKTX",
      "name": "MarketAxess",
      "removed_on": "2025-09-22",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "MKTX",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 116.53,
        "effective_last_minus_removal_days": 283
      },
      "review_flags": []
    },
    {
      "symbol": "WBA",
      "name": "Walgreens Boots Alliance",
      "removed_on": "2025-08-28",
      "reason": "acquisition",
      "reason_text": "Sycamore Partners acquired Walgreens Boots Alliance.",
      "restore_symbol": "WBA",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1049,
        "bars_kept_after_truncation": 1049,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2025-08-27",
        "effective_last_close": 11.98,
        "effective_last_minus_removal_days": -1
      },
      "review_flags": []
    },
    {
      "symbol": "HES",
      "name": "Hess Corporation",
      "removed_on": "2025-07-23",
      "reason": "acquisition",
      "reason_text": "Chevron acquired Hess.",
      "restore_symbol": "HES",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1020,
        "bars_kept_after_truncation": 1020,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2025-07-17",
        "effective_last_close": 148.97,
        "effective_last_minus_removal_days": -6
      },
      "review_flags": []
    },
    {
      "symbol": "ANSS",
      "name": "Ansys",
      "removed_on": "2025-07-18",
      "reason": "acquisition",
      "reason_text": "Synopsys acquired Ansys.",
      "restore_symbol": "ANSS",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1019,
        "bars_kept_after_truncation": 1019,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2025-07-16",
        "effective_last_close": 374.3,
        "effective_last_minus_removal_days": -2
      },
      "review_flags": []
    },
    {
      "symbol": "JNPR",
      "name": "Juniper Networks",
      "removed_on": "2025-07-09",
      "reason": "acquisition",
      "reason_text": "Hewlett Packard Enterprise acquired Juniper Networks.",
      "restore_symbol": "JNPR",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1009,
        "bars_kept_after_truncation": 1009,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2025-07-01",
        "effective_last_close": 39.95,
        "effective_last_minus_removal_days": -8
      },
      "review_flags": []
    },
    {
      "symbol": "DFS",
      "name": "Discover Financial",
      "removed_on": "2025-05-19",
      "reason": "acquisition",
      "reason_text": "Capital One acquired Discover Financial.",
      "restore_symbol": "DFS",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 979,
        "bars_kept_after_truncation": 979,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2025-05-16",
        "effective_last_close": 200.05,
        "effective_last_minus_removal_days": -3
      },
      "review_flags": []
    },
    {
      "symbol": "BWA",
      "name": "BorgWarner",
      "removed_on": "2025-03-24",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "BWA",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 63.52,
        "effective_last_minus_removal_days": 465
      },
      "review_flags": []
    },
    {
      "symbol": "TFX",
      "name": "Teleflex",
      "removed_on": "2025-03-24",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "TFX",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 133.99,
        "effective_last_minus_removal_days": 465
      },
      "review_flags": []
    },
    {
      "symbol": "CE",
      "name": "Celanese",
      "removed_on": "2025-03-24",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "CE",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 47.68,
        "effective_last_minus_removal_days": 465
      },
      "review_flags": []
    },
    {
      "symbol": "FMC",
      "name": "FMC Corporation",
      "removed_on": "2025-03-24",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "FMC",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 11.35,
        "effective_last_minus_removal_days": 465
      },
      "review_flags": []
    },
    {
      "symbol": "QRVO",
      "name": "Qorvo",
      "removed_on": "2024-12-23",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "QRVO",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 87.57,
        "effective_last_minus_removal_days": 556
      },
      "review_flags": []
    },
    {
      "symbol": "AMTM",
      "name": "Amentum",
      "removed_on": "2024-12-23",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "AMTM",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 440,
        "bars_kept_after_truncation": 440,
        "first_bar": "2024-09-30",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 21.24,
        "effective_last_minus_removal_days": 556
      },
      "review_flags": []
    },
    {
      "symbol": "CTLT",
      "name": "Catalent",
      "removed_on": "2024-12-23",
      "reason": "acquisition",
      "reason_text": "Novo Holdings A/S acquired Catalent.",
      "restore_symbol": "CTLT",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 877,
        "bars_kept_after_truncation": 877,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2024-12-17",
        "effective_last_close": 63.48,
        "effective_last_minus_removal_days": -6
      },
      "review_flags": []
    },
    {
      "symbol": "MRO",
      "name": "Marathon Oil",
      "removed_on": "2024-11-26",
      "reason": "acquisition",
      "reason_text": "ConocoPhillips acquired Marathon Oil.",
      "restore_symbol": "MRO",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 860,
        "bars_kept_after_truncation": 860,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2024-11-21",
        "effective_last_close": 28.55,
        "effective_last_minus_removal_days": -5
      },
      "review_flags": []
    },
    {
      "symbol": "BBWI",
      "name": "Bath & Body Works, Inc.",
      "removed_on": "2024-10-01",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "BBWI",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1234,
        "bars_kept_after_truncation": 1234,
        "first_bar": "2021-08-03",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 21.96,
        "effective_last_minus_removal_days": 639
      },
      "review_flags": []
    },
    {
      "symbol": "AAL",
      "name": "American Airlines Group",
      "removed_on": "2024-09-23",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "AAL",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 17.92,
        "effective_last_minus_removal_days": 647
      },
      "review_flags": []
    },
    {
      "symbol": "ETSY",
      "name": "Etsy",
      "removed_on": "2024-09-23",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "ETSY",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 76.97,
        "effective_last_minus_removal_days": 647
      },
      "review_flags": []
    },
    {
      "symbol": "BIO",
      "name": "Bio-Rad Laboratories",
      "removed_on": "2024-09-23",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "BIO",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 296.86,
        "effective_last_minus_removal_days": 647
      },
      "review_flags": []
    },
    {
      "symbol": "RHI",
      "name": "Robert Half",
      "removed_on": "2024-06-24",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "RHI",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 33.48,
        "effective_last_minus_removal_days": 738
      },
      "review_flags": []
    },
    {
      "symbol": "CMA",
      "name": "Comerica",
      "removed_on": "2024-06-24",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "CMA",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1156,
        "bars_kept_after_truncation": 1156,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-01-30",
        "effective_last_close": 88.67,
        "effective_last_minus_removal_days": 585
      },
      "review_flags": [
        "market status not independently verified: stops trading 2026-01-30 for a reason not stated in the source row (removed for market cap in 2024)"
      ]
    },
    {
      "symbol": "ILMN",
      "name": "Illumina, Inc.",
      "removed_on": "2024-06-24",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "ILMN",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 188.68,
        "effective_last_minus_removal_days": 738
      },
      "review_flags": []
    },
    {
      "symbol": "PXD",
      "name": "Pioneer Natural Resources",
      "removed_on": "2024-05-08",
      "reason": "acquisition",
      "reason_text": "ExxonMobil acquired Pioneer Natural Resources.",
      "restore_symbol": "PXD",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 719,
        "bars_kept_after_truncation": 719,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2024-05-02",
        "effective_last_close": 269.62,
        "effective_last_minus_removal_days": -6
      },
      "review_flags": []
    },
    {
      "symbol": "XRAY",
      "name": "Dentsply Sirona",
      "removed_on": "2024-04-03",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "XRAY",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 11.65,
        "effective_last_minus_removal_days": 820
      },
      "review_flags": []
    },
    {
      "symbol": "VFC",
      "name": "VF Corporation",
      "removed_on": "2024-04-03",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "VFC",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 16.3,
        "effective_last_minus_removal_days": 820
      },
      "review_flags": []
    },
    {
      "symbol": "FLT",
      "name": "Corpay",
      "removed_on": "2024-03-25",
      "reason": "ticker_change",
      "reason_text": "FLEETCOR Technologies changed its name to Corpay.",
      "restore_symbol": null,
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": null,
        "bars_kept_after_truncation": null,
        "first_bar": null,
        "effective_last_bar": null,
        "effective_last_close": null,
        "effective_last_minus_removal_days": null
      },
      "review_flags": [
        "not restored: CPAY is already tracked and Alpaca serves it from 2021-06-24, i.e. it already carries the pre-rename history"
      ]
    },
    {
      "symbol": "WHR",
      "name": "Whirlpool Corporation",
      "removed_on": "2024-03-18",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "WHR",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 38.1,
        "effective_last_minus_removal_days": 836
      },
      "review_flags": []
    },
    {
      "symbol": "ZION",
      "name": "Zions Bancorporation",
      "removed_on": "2024-03-18",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "ZION",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 69.35,
        "effective_last_minus_removal_days": 836
      },
      "review_flags": []
    },
    {
      "symbol": "CDAY",
      "name": "Dayforce",
      "removed_on": "2024-02-01",
      "reason": "ticker_change",
      "reason_text": "Ceridian changed its ticker symbol from CDAY to DAY.",
      "restore_symbol": "CDAY",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 655,
        "bars_kept_after_truncation": 655,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2024-01-31",
        "effective_last_close": 69.52,
        "effective_last_minus_removal_days": -1
      },
      "review_flags": []
    },
    {
      "symbol": "SEE",
      "name": "Sealed Air",
      "removed_on": "2023-12-18",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "SEE",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1202,
        "bars_kept_after_truncation": 1202,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-04-08",
        "effective_last_close": 42.15,
        "effective_last_minus_removal_days": 842
      },
      "review_flags": [
        "market status not independently verified: stops trading 2026-04-08 for a reason not stated in the source row (removed for market cap in 2023)"
      ]
    },
    {
      "symbol": "ALK",
      "name": "Alaska Air Group",
      "removed_on": "2023-12-18",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "ALK",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 51.09,
        "effective_last_minus_removal_days": 927
      },
      "review_flags": []
    },
    {
      "symbol": "SEDG",
      "name": "SolarEdge",
      "removed_on": "2023-12-18",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "SEDG",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 52.38,
        "effective_last_minus_removal_days": 927
      },
      "review_flags": []
    },
    {
      "symbol": "OGN",
      "name": "Organon & Co.",
      "removed_on": "2023-10-18",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "OGN",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 13.55,
        "effective_last_minus_removal_days": 988
      },
      "review_flags": []
    },
    {
      "symbol": "ATVI",
      "name": "Activision Blizzard",
      "removed_on": "2023-10-18",
      "reason": "acquisition",
      "reason_text": "Acquisition of Activision Blizzard by Microsoft.",
      "restore_symbol": "ATVI",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 581,
        "bars_kept_after_truncation": 581,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2023-10-13",
        "effective_last_close": 94.42,
        "effective_last_minus_removal_days": -5
      },
      "review_flags": []
    },
    {
      "symbol": "DXC",
      "name": "DXC Technology",
      "removed_on": "2023-10-03",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "DXC",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 9.91,
        "effective_last_minus_removal_days": 1003
      },
      "review_flags": []
    },
    {
      "symbol": "LNC",
      "name": "Lincoln National Corporation",
      "removed_on": "2023-09-18",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "LNC",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 37.0,
        "effective_last_minus_removal_days": 1018
      },
      "review_flags": []
    },
    {
      "symbol": "NWL",
      "name": "Newell Brands",
      "removed_on": "2023-09-18",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "NWL",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 5.83,
        "effective_last_minus_removal_days": 1018
      },
      "review_flags": []
    },
    {
      "symbol": "AAP",
      "name": "Advance Auto Parts",
      "removed_on": "2023-08-25",
      "reason": "unclassified",
      "reason_text": "Johnson & Johnson offered to exchange the shares of Kenvue held for shares of Johnson & Johnson in a split-off exchange offer.",
      "restore_symbol": "AAP",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 61.53,
        "effective_last_minus_removal_days": 1042
      },
      "review_flags": [
        "reason not classified: the source row gives the reason for the addition (Kenvue) rather than for this removal; AAP is still trading, so treat it as an ordinary index removal"
      ]
    },
    {
      "symbol": "DISH",
      "name": "Dish Network",
      "removed_on": "2023-06-20",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "DISH",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 634,
        "bars_kept_after_truncation": 634,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2023-12-29",
        "effective_last_close": 5.77,
        "effective_last_minus_removal_days": 192
      },
      "review_flags": [
        "market status not independently verified: stops trading 2023-12-29, six months after the index removal, for a reason not stated in the source row"
      ]
    },
    {
      "symbol": "FRC",
      "name": "First Republic Bank",
      "removed_on": "2023-05-04",
      "reason": "receivership",
      "reason_text": "The FDIC placed First Republic Bank into receivership.",
      "restore_symbol": "FRC",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 465,
        "bars_kept_after_truncation": 465,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2023-04-28",
        "effective_last_close": 3.51,
        "effective_last_minus_removal_days": -6
      },
      "review_flags": []
    },
    {
      "symbol": "LUMN",
      "name": "Lumen Technologies",
      "removed_on": "2023-03-20",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "LUMN",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 6.43,
        "effective_last_minus_removal_days": 1200
      },
      "review_flags": []
    },
    {
      "symbol": "SBNY",
      "name": "Signature Bank",
      "removed_on": "2023-03-15",
      "reason": "receivership",
      "reason_text": "The FDIC placed Signature Bank into FDIC Receivership.",
      "restore_symbol": "SBNY",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 940,
        "bars_kept_after_truncation": 431,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2023-03-10",
        "effective_last_close": 70.0,
        "effective_last_minus_removal_days": -5
      },
      "review_flags": [
        "509 trailing bars excluded by the reviewed cutoff at 2023-03-10; Alpaca freezes the price after that date instead of ending the series"
      ]
    },
    {
      "symbol": "SIVB",
      "name": "SVB Financial Group",
      "removed_on": "2023-03-15",
      "reason": "receivership",
      "reason_text": "The FDIC placed the main subsidiary Silicon Valley Bank into receivership.",
      "restore_symbol": "SIVB",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 430,
        "bars_kept_after_truncation": 430,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2023-03-09",
        "effective_last_close": 106.04,
        "effective_last_minus_removal_days": -6
      },
      "review_flags": []
    },
    {
      "symbol": "VNO",
      "name": "Vornado Realty Trust",
      "removed_on": "2023-01-05",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "VNO",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 40.58,
        "effective_last_minus_removal_days": 1274
      },
      "review_flags": []
    },
    {
      "symbol": "ABMD",
      "name": "Abiomed",
      "removed_on": "2022-12-22",
      "reason": "acquisition",
      "reason_text": "Johnson & Johnson acquired Abiomed.",
      "restore_symbol": "ABMD",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 378,
        "bars_kept_after_truncation": 378,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2022-12-21",
        "effective_last_close": 381.02,
        "effective_last_minus_removal_days": -1
      },
      "review_flags": []
    },
    {
      "symbol": "FBHS",
      "name": "Fortune Brands Home & Security",
      "removed_on": "2022-12-19",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "FBIN",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 1261,
        "bars_kept_after_truncation": 1261,
        "first_bar": "2021-06-24",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 53.22,
        "effective_last_minus_removal_days": 1291
      },
      "review_flags": [
        "restore FBIN instead of FBHS: Fortune Brands spun off MasterBrand and renamed to Fortune Brands Innovations (FBIN) on 2022-12-15; this is a corporate action, not only a ticker change - see corporate_action_caveats",
        "FBIN carries a MasterBrand spin-off on 2022-12-15 that shows as a -6.91% move in the price series - see corporate_action_caveats"
      ]
    },
    {
      "symbol": "MBC",
      "name": "MasterBrand",
      "removed_on": "2022-12-19",
      "reason": "market_cap",
      "reason_text": "Market capitalization changes.",
      "restore_symbol": "MBC",
      "evidence": {
        "in_base_snapshot": false,
        "alpaca_bars_in_window": 888,
        "bars_kept_after_truncation": 888,
        "first_bar": "2022-12-15",
        "effective_last_bar": "2026-07-02",
        "effective_last_close": 9.88,
        "effective_last_minus_removal_days": 1291
      },
      "review_flags": []
    },
    {
      "symbol": "TWTR",
      "name": "Twitter, Inc.",
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      "reason": "acquisition",
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      "symbol": "DRE",
      "name": "Duke Realty",
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      "symbol": "CERN",
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      "symbol": "DISCA",
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        "restore GAP instead of GPS: Gap Inc. changed its ticker GPS->GAP in 2024; GAP carries the full continuous series and is not tracked"
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        "not restored: WTW is already tracked and Alpaca serves it from 2021-06-24, i.e. it already carries the pre-rename history"
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}