Add London Stock Exchange (LSE) holidays

CONTRIBUTORS

@@ -54,6 +54,7 @@ Douglas Franklin
 Eden Juscelino
 Edison Robles
 Edward Betts
+Eesh Saxena
 Eldar Mustafayev
 Emmanuel Arias
 Eugenio Panadero Maciá

README.md

@@ -1994,6 +1994,13 @@ code when available. The following financial markets are available:
 <td></td>
 </tr>
 <tr>
+<td>London Stock Exchange</td>
+<td>XLON</td>
+<td>London Stock Exchange (LSE) market holidays</td>
+<td><strong>en_GB</strong>, en_US, th</td>
+<td>HALF_DAY</td>
+</tr>
+<tr>
 <td>NASDAQ</td>
 <td>XNAS</td>
 <td>National Association of Securities Dealers Automated Quotations (NASDAQ) holidays</td>

holidays/countries/united_kingdom.py

@@ -13,6 +13,7 @@
 from gettext import gettext as tr
 
 from holidays.calendars.gregorian import APR, MAY, JUN, JUL, SEP, DEC
+from holidays.constants import PUBLIC
 from holidays.groups import ChristianHolidays, InternationalHolidays, StaticHolidays
 from holidays.observed_holiday_base import (
     ObservedHolidayBase,
@@ -104,7 +105,7 @@ def _populate_common(self):
             self._add_whit_monday(tr("Whit Monday"))
 
     def _populate_subdiv_holidays(self):
-        if self.subdiv != "SCT":
+        if PUBLIC in self.categories and self.subdiv != "SCT":
             if self._year >= 1975:
                 # New Year's Day.
                 self._add_observed(self._add_new_years_day(tr("New Year's Day")))

holidays/financial/__init__.py

@@ -18,6 +18,7 @@
 from holidays.financial.hong_kong_stock_exchange import HongKongStockExchange, XHKG, HKEX, SEHK
 from holidays.financial.ice_futures_europe import IceFuturesEurope, ICEFuturesEurope, IFEU
 from holidays.financial.japan_exchange import JapanExchange, XJPX, JPX, TSE, OSE
+from holidays.financial.london_stock_exchange import LondonStockExchange, XLON, LSE
 from holidays.financial.nasdaq import NASDAQ, XNAS
 from holidays.financial.national_stock_exchange_of_india import (
     NationalStockExchangeOfIndia,

holidays/financial/london_stock_exchange.py

@@ -0,0 +1,62 @@
+#  holidays
+#  --------
+#  A fast, efficient Python library for generating country, province and state
+#  specific sets of holidays on the fly. It aims to make determining whether a
+#  specific date is a holiday as fast and flexible as possible.
+#
+#  Authors: Vacanza Team and individual contributors (see CONTRIBUTORS file)
+#           dr-prodigy <dr.prodigy.github@gmail.com> (c) 2017-2023
+#           ryanss <ryanssdev@icloud.com> (c) 2014-2017
+#  Website: https://github.com/vacanza/holidays
+#  License: MIT (see LICENSE file)
+
+from gettext import gettext as tr
+
+from holidays.constants import HALF_DAY, PUBLIC
+from holidays.countries.united_kingdom import UnitedKingdom
+from holidays.mixins.child_entity import ChildEntity
+
+
+class LondonStockExchange(ChildEntity, UnitedKingdom):
+    """London Stock Exchange (LSE) holidays.
+
+    The London Stock Exchange is closed on the bank holidays observed in
+    England and Wales.
+
+    On Christmas Eve and New Year's Eve the exchange runs a shortened trading
+    session.
+
+    References:
+        * <https://en.wikipedia.org/wiki/London_Stock_Exchange>
+        * <https://en.wikipedia.org/wiki/Bank_holiday>
+        * [LSE business days](https://www.londonstockexchange.com/equities-trading/business-days)
+    """
+
+    country = None  # type: ignore[assignment]
+    market = "XLON"
+    parent_entity = UnitedKingdom
+    parent_entity_subdivision_code = "ENG"
+    supported_categories = (HALF_DAY, PUBLIC)
+    start_year = 2000
+
+    def _populate_half_day_holidays(self) -> None:
+        # %s (markets close at 12:30pm).
+        close_12_30pm_label = tr("%s (markets close at 12:30pm)")
+
+        self._add_christmas_eve(
+            # Christmas Eve.
+            self._format_holiday_name(close_12_30pm_label, tr("Christmas Eve"))
+        )
+
+        self._add_new_years_eve(
+            # New Year's Eve.
+            self._format_holiday_name(close_12_30pm_label, tr("New Year's Eve"))
+        )
+
+
+class XLON(LondonStockExchange):
+    pass
+
+
+class LSE(LondonStockExchange):
+    pass

holidays/locale/en_GB/LC_MESSAGES/XLON.po

@@ -0,0 +1,41 @@
+#  holidays
+#  --------
+#  A fast, efficient Python library for generating country, province and state
+#  specific sets of holidays on the fly. It aims to make determining whether a
+#  specific date is a holiday as fast and flexible as possible.
+#
+#  Authors: Vacanza Team and individual contributors (see CONTRIBUTORS file)
+#           dr-prodigy <dr.prodigy.github@gmail.com> (c) 2017-2023
+#           ryanss <ryanssdev@icloud.com> (c) 2014-2017
+#  Website: https://github.com/vacanza/holidays
+#  License: MIT (see LICENSE file)
+#
+# London Stock Exchange (LSE) holidays.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Holidays 0.101\n"
+"Report-Msgid-Bugs-To: l10n@vacanza.dev\n"
+"POT-Creation-Date: 2026-07-09 00:00+0530\n"
+"PO-Revision-Date: 2026-07-09 00:00+0530\n"
+"Last-Translator: eeshsaxena <eeshsaxena@gmail.com>\n"
+"Language-Team: Holidays Localization Team\n"
+"Language: en_GB\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Lingva 5.0.6\n"
+"X-Source-Language: en_GB\n"
+
+#. %s (markets close at 12:30pm).
+#, c-format
+msgid "%s (markets close at 12:30pm)"
+msgstr ""
+
+#. Christmas Eve.
+msgid "Christmas Eve"
+msgstr ""
+
+#. New Year's Eve.
+msgid "New Year's Eve"
+msgstr ""

holidays/locale/en_US/LC_MESSAGES/XLON.po

@@ -0,0 +1,41 @@
+#  holidays
+#  --------
+#  A fast, efficient Python library for generating country, province and state
+#  specific sets of holidays on the fly. It aims to make determining whether a
+#  specific date is a holiday as fast and flexible as possible.
+#
+#  Authors: Vacanza Team and individual contributors (see CONTRIBUTORS file)
+#           dr-prodigy <dr.prodigy.github@gmail.com> (c) 2017-2023
+#           ryanss <ryanssdev@icloud.com> (c) 2014-2017
+#  Website: https://github.com/vacanza/holidays
+#  License: MIT (see LICENSE file)
+#
+# London Stock Exchange (LSE) holidays en_US localization.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Holidays 0.101\n"
+"Report-Msgid-Bugs-To: l10n@vacanza.dev\n"
+"POT-Creation-Date: 2026-07-09 00:00+0530\n"
+"PO-Revision-Date: 2026-07-09 00:00+0530\n"
+"Last-Translator: eeshsaxena <eeshsaxena@gmail.com>\n"
+"Language-Team: Holidays Localization Team\n"
+"Language: en_US\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Lingva 5.0.6\n"
+"X-Source-Language: en_GB\n"
+
+#. %s (markets close at 12:30pm).
+#, c-format
+msgid "%s (markets close at 12:30pm)"
+msgstr "%s (markets close at 12:30pm)"
+
+#. Christmas Eve.
+msgid "Christmas Eve"
+msgstr "Christmas Eve"
+
+#. New Year's Eve.
+msgid "New Year's Eve"
+msgstr "New Year's Eve"

holidays/locale/th/LC_MESSAGES/XLON.po

@@ -0,0 +1,41 @@
+#  holidays
+#  --------
+#  A fast, efficient Python library for generating country, province and state
+#  specific sets of holidays on the fly. It aims to make determining whether a
+#  specific date is a holiday as fast and flexible as possible.
+#
+#  Authors: Vacanza Team and individual contributors (see CONTRIBUTORS file)
+#           dr-prodigy <dr.prodigy.github@gmail.com> (c) 2017-2023
+#           ryanss <ryanssdev@icloud.com> (c) 2014-2017
+#  Website: https://github.com/vacanza/holidays
+#  License: MIT (see LICENSE file)
+#
+# London Stock Exchange (LSE) holidays th localization.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Holidays 0.101\n"
+"Report-Msgid-Bugs-To: l10n@vacanza.dev\n"
+"POT-Creation-Date: 2026-07-09 00:00+0530\n"
+"PO-Revision-Date: 2026-07-09 00:00+0530\n"
+"Last-Translator: eeshsaxena <eeshsaxena@gmail.com>\n"
+"Language-Team: Holidays Localization Team\n"
+"Language: th\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Generated-By: Lingva 5.0.6\n"
+"X-Source-Language: en_GB\n"
+
+#. %s (markets close at 12:30pm).
+#, c-format
+msgid "%s (markets close at 12:30pm)"
+msgstr "%s (ตลาดปิดเวลา 12:30 น.)"
+
+#. Christmas Eve.
+msgid "Christmas Eve"
+msgstr "วันคริสต์มาสอีฟ"
+
+#. New Year's Eve.
+msgid "New Year's Eve"
+msgstr "วันสิ้นปี"

holidays/registry.py

@@ -294,6 +294,7 @@
     "hong_kong_stock_exchange": ("HongKongStockExchange", "XHKG", "HKEX", "SEHK"),
     "ice_futures_europe": ("IceFuturesEurope", "IFEU", "ICEFuturesEurope"),
     "japan_exchange": ("JapanExchange", "XJPX", "JPX", "TSE", "OSE"),
+    "london_stock_exchange": ("LondonStockExchange", "XLON", "LSE"),
     "nasdaq": ("NASDAQ", "XNAS"),
     "national_stock_exchange_of_india": ("NationalStockExchangeOfIndia", "XNSE", "NSE"),
     "ny_stock_exchange": ("NewYorkStockExchange", "XNYS", "NYSE"),

tests/financial/test_london_stock_exchange.py

@@ -0,0 +1,106 @@
+#  holidays
+#  --------
+#  A fast, efficient Python library for generating country, province and state
+#  specific sets of holidays on the fly. It aims to make determining whether a
+#  specific date is a holiday as fast and flexible as possible.
+#
+#  Authors: Vacanza Team and individual contributors (see CONTRIBUTORS file)
+#           dr-prodigy <dr.prodigy.github@gmail.com> (c) 2017-2023
+#           ryanss <ryanssdev@icloud.com> (c) 2014-2017
+#  Website: https://github.com/vacanza/holidays
+#  License: MIT (see LICENSE file)
+
+from unittest import TestCase
+
+from holidays.financial.london_stock_exchange import LondonStockExchange, XLON, LSE
+from tests.common import CommonFinancialTests
+
+
+class TestLondonStockExchange(CommonFinancialTests, TestCase):
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass(LondonStockExchange)
+
+    def test_code(self):
+        self.assertTrue(hasattr(self.holidays, "market"))
+        self.assertIsNone(getattr(self.holidays, "country", None))
+
+    def test_market_aliases(self):
+        self.assertAliases(LondonStockExchange, XLON, LSE)
+
+    def test_no_holidays(self):
+        self.assertNoHolidays(LondonStockExchange(years=1999))
+
+    def test_2022(self):
+        # Exercises the royal one-off bank holidays alongside the regular
+        # England & Wales calendar; year-by-year correctness of the underlying
+        # calendar itself is covered by the United Kingdom test suite.
+        self.assertHolidaysInYear(
+            2022,
+            ("2022-01-01", "New Year's Day"),
+            ("2022-01-03", "New Year's Day (observed)"),
+            ("2022-04-15", "Good Friday"),
+            ("2022-04-18", "Easter Monday"),
+            ("2022-05-02", "May Day"),
+            ("2022-06-02", "Spring Bank Holiday"),
+            ("2022-06-03", "Platinum Jubilee of Elizabeth II"),
+            ("2022-08-29", "Late Summer Bank Holiday"),
+            ("2022-09-19", "State Funeral of Queen Elizabeth II"),
+            ("2022-12-25", "Christmas Day"),
+            ("2022-12-26", "Boxing Day"),
+            ("2022-12-27", "Christmas Day (observed)"),
+        )
+
+    def test_christmas_eve(self):
+        name = "Christmas Eve (markets close at 12:30pm)"
+        self.assertNoHolidayName(name)
+        self.assertHalfDayHolidayName(name, (f"{year}-12-24" for year in self.full_range))
+
+    def test_new_years_eve(self):
+        name = "New Year's Eve (markets close at 12:30pm)"
+        self.assertNoHolidayName(name)
+        self.assertHalfDayHolidayName(name, (f"{year}-12-31" for year in self.full_range))
+
+    def test_l10n_default(self):
+        self.assertLocalizedHolidays(
+            ("2024-01-01", "New Year's Day"),
+            ("2024-03-29", "Good Friday"),
+            ("2024-04-01", "Easter Monday"),
+            ("2024-05-06", "May Day"),
+            ("2024-05-27", "Spring Bank Holiday"),
+            ("2024-08-26", "Late Summer Bank Holiday"),
+            ("2024-12-24", "Christmas Eve (markets close at 12:30pm)"),
+            ("2024-12-25", "Christmas Day"),
+            ("2024-12-26", "Boxing Day"),
+            ("2024-12-31", "New Year's Eve (markets close at 12:30pm)"),
+        )
+
+    def test_l10n_en_us(self):
+        self.assertLocalizedHolidays(
+            "en_US",
+            ("2024-01-01", "New Year's Day"),
+            ("2024-03-29", "Good Friday"),
+            ("2024-04-01", "Easter Monday"),
+            ("2024-05-06", "May Day"),
+            ("2024-05-27", "Spring Bank Holiday"),
+            ("2024-08-26", "Late Summer Bank Holiday"),
+            ("2024-12-24", "Christmas Eve (markets close at 12:30pm)"),
+            ("2024-12-25", "Christmas Day"),
+            ("2024-12-26", "Boxing Day"),
+            ("2024-12-31", "New Year's Eve (markets close at 12:30pm)"),
+        )
+
+    def test_l10n_th(self):
+        self.assertLocalizedHolidays(
+            "th",
+            ("2024-01-01", "วันขึ้นปีใหม่"),
+            ("2024-03-29", "วันศุกร์ประเสริฐ"),
+            ("2024-04-01", "วันจันทร์อีสเตอร์"),
+            ("2024-05-06", "วันเมย์เดย์"),
+            ("2024-05-27", "วันหยุดฤดูใบไม้ผลิของธนาคาร"),
+            ("2024-08-26", "วันหยุดช่วงปลายฤดูร้อนของธนาคาร"),
+            ("2024-12-24", "วันคริสต์มาสอีฟ (ตลาดปิดเวลา 12:30 น.)"),
+            ("2024-12-25", "วันคริสต์มาส"),
+            ("2024-12-26", "วันเปิดกล่องของขวัญ"),
+            ("2024-12-31", "วันสิ้นปี (ตลาดปิดเวลา 12:30 น.)"),
+        )