https://www.hkex.com.hk/Services/RSS-Feeds/The-SEHK-Options-Clearing-House-Limited?sc_lang=enParticipant Circulars - The SEHK Options Clearing House Limited RSSen{3CB306A8-DA08-4910-8D6D-58264F825233}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_116_2026Apr02160313?sc_lang=enCollateral Haircut AdjustmentThu, 02 Apr 2026 16:36:17 +0800{FB4BCBFA-4A4A-4061-908F-B45975D2AE26}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/20260401_MSM_005_2026?sc_lang=en2026 Annual Attestation and Inspection ProgrammeWed, 01 Apr 2026 18:43:42 +0800{7DC5E2CB-8025-4977-842D-995BC5DCB61F}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/20260401_CLR_DCASS_044_2026?sc_lang=enOrion Derivatives Platform: Upcoming Town HallWed, 01 Apr 2026 18:18:03 +0800{077834E4-A204-469E-9B9C-3270E57EA822}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_109_2026Apr01133000?sc_lang=enSEOCH Reserve Fund Variable ContributionsWed, 01 Apr 2026 13:03:19 +0800{3291A998-A4F4-4080-9EB2-CF7BBB8A3163}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/20260331_MSM_003_2026?sc_lang=enCompliance Bulletin (Issue No. 17) - (1) Reminder on Large Open Position (“LOP”) Reporting Requirements for Positions Held or Controlled Through Multiple Brokers; (2) Dealings with Suspended Exchange Participants; and (3) Closing of the 2025 Annual Attestation and Inspection ProgrammeTue, 31 Mar 2026 22:05:30 +0800{335DC94D-9A9B-481F-820A-BE5888C90F3F}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/20260331_MSM_002_2026?sc_lang=enClosing of 2025 Annual Attestation and Inspection ProgrammeTue, 31 Mar 2026 21:39:19 +0800{7926EAF8-ADA1-4701-AB14-73657D2AE774}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_CM2_042_2026Mar31170305?sc_lang=enRedelivery of surplus cash balance in Hong Kong dollars in a SEOCH Participant’s CCMS Collateral AccountTue, 31 Mar 2026 17:24:17 +0800{504BD243-5614-428F-ADD3-FD208D5B6EFF}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_103_2026Mar27180301?sc_lang=enRisk Management Arrangements in respect of the Ching Ming Festival and Easter Holidays – ReminderFri, 27 Mar 2026 18:27:28 +0800{81236074-20EC-440D-9E9B-E5A0703081A0}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_093_2026Mar20160320?sc_lang=enRisk Management Arrangements in respect of the Ching Ming Festival and Easter HolidaysFri, 20 Mar 2026 16:24:30 +0800{D5E3F7AE-2997-427E-B6A7-F09DFB12F733}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_090_2026Mar20113251?sc_lang=enReminder on Payment Obligations of Clearing ParticipantsFri, 20 Mar 2026 11:54:42 +0800{312238C2-2FCA-4772-ADE2-2E573536E2B8}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_OEC_036_2026?sc_lang=enReminder: SFTP Facilities Upgrade for the Report Access PlatformFri, 13 Mar 2026 18:21:13 +0800{EF7056C6-6F4C-492D-A342-CEB2F9025320}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_GRM_QRM_001_2026?sc_lang=enReserve Fund ThresholdWed, 04 Mar 2026 17:47:44 +0800{52496734-E9CD-4497-BC85-CE1BD5846143}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_071_2026Mar04160305?sc_lang=enStock Collateral HaircutWed, 04 Mar 2026 16:25:50 +0800{2BBD50D8-2253-468F-86F0-DA7F2CE55A7E}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/20260303_CLR_SEOCH_034?sc_lang=enRollout of HKATS and DCASS Operating System UpgradeWed, 04 Mar 2026 11:26:16 +0800{BD8362D1-40E9-4C40-A636-6404C49B5987}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_068_2026Mar03160325?sc_lang=enCollateral Haircut AdjustmentTue, 03 Mar 2026 18:36:17 +0800{F1391CB4-C148-41F0-B061-68E370D1B3D7}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_062_2026Mar02133000?sc_lang=enSEOCH Reserve Fund Variable ContributionsMon, 02 Mar 2026 12:46:51 +0800{FB2FF6B3-0CD0-4F25-B45A-36B38E902F20}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/20260210_CDCO_DCASS_026_2026?sc_lang=enMarket Readiness for the Introduction of Additional Market Codes for Stock Option Contracts of New UnderlyingTue, 10 Feb 2026 21:15:44 +0800{9F25E578-5C7A-4CA6-BD89-DBA667B38905}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_049_2026Feb10170304?sc_lang=enRisk Management Arrangements in respect of the Lunar New Year Holidays – ReminderTue, 10 Feb 2026 17:25:49 +0800{7D0FCA1A-2FAA-4269-BACA-E9E361DF816D}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/20260208_CLR_SEOCH_024?sc_lang=enUpdates on HKATS and DCASS Operating System UpgradeSun, 08 Feb 2026 16:54:47 +0800{22A5E491-8049-45DE-8E92-88EA5C72B808}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_039_2026Feb03160325?sc_lang=enCollateral Haircut AdjustmentTue, 03 Feb 2026 18:40:01 +0800{C636BA7B-B48B-44FB-BEE7-937D213096B0}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_034_2026Feb03160324?sc_lang=enRisk Management Arrangements in respect of the Lunar New Year HolidaysTue, 03 Feb 2026 16:48:22 +0800{857EEA79-B29C-445B-A4D9-DAEBE3EB119C}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_030_2026Feb02133000?sc_lang=enSEOCH Reserve Fund Variable ContributionsMon, 02 Feb 2026 13:29:11 +0800{AFFB2850-2884-4B4B-9257-C15D58D2ACCD}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_OEC_015?sc_lang=enRollout of HKATS and DCASS Operating System UpgradeThu, 22 Jan 2026 17:00:15 +0800{E2F7716A-C9BC-4A50-90FC-FE13BE226143}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_OEC_012_2026?sc_lang=enSFTP Facilities Upgrade for the Report Access Platform - Verification SessionTue, 20 Jan 2026 19:08:25 +0800{962C2C41-9E0A-474F-BDB0-A47685ACA23F}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_014_2026Jan12170322?sc_lang=enMargin Parameters and Update of PC-SPAN Organisation Master File for Six New Stock Option ClassesTue, 13 Jan 2026 13:37:57 +0800{5392ED72-8A9E-4C20-A4F8-F039A514E4FF}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_010_2026Jan05163306?sc_lang=enCollateral Haircut AdjustmentMon, 05 Jan 2026 17:08:23 +0800{BA32A370-54E7-4FE0-9175-710E5185803B}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2026/SEOCH_DCRC_003_2026Jan02133000?sc_lang=enSEOCH Reserve Fund Variable ContributionsFri, 02 Jan 2026 13:39:47 +0800{919CA45D-A35A-4E17-8BA1-D747A40F4BA2}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/20251231_MSM_014_2025?sc_lang=enCompliance Bulletin (Issue No. 16) - Reminder on Hong Kong Investor Identification Regime (“HKIDR”) BCAN-CID Mapping File Submission RequirementsWed, 31 Dec 2025 16:53:20 +0800{A0CE8ABC-F77F-4630-9E4C-265BBC18ED5E}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_DCRC_352_2025Dec23160314?sc_lang=enMandatory Intra-day Margin Call in respect of the New Year HolidayTue, 23 Dec 2025 16:27:33 +0800{84EE9C0F-3EDD-4479-8C4E-7FD17E0C57F7}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_DCRC_349_2025Dec18163311?sc_lang=enRisk Management Arrangements in respect of the Christmas Holidays – ReminderThu, 18 Dec 2025 16:56:19 +0800{454537B5-772A-47E0-884A-A7C8795C8B57}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_DCRC_343_2025Dec11180308?sc_lang=enRisk Management Arrangements in respect of the Christmas HolidaysThu, 11 Dec 2025 18:27:07 +0800{8479BE14-5527-46E7-888B-65F508108CD9}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/20251204_CDCO_DCASS_294_2025?sc_lang=enPractice Session for DCASS Operating System UpgradeThu, 04 Dec 2025 17:31:42 +0800{7FC928FC-1426-4875-94CB-A11B71FD5024}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_DCRC_340_2025Dec03140349?sc_lang=enStock Collateral HaircutWed, 03 Dec 2025 14:26:29 +0800{BFD6FD53-74A6-43A1-8EA0-5A68ED6A820D}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_DCRC_338_2025Dec02163516?sc_lang=enCollateral Haircut AdjustmentTue, 02 Dec 2025 17:14:40 +0800{BB5DE4CB-E6C0-492D-A5E4-CB923CE01525}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/20251201-SEOCH-291?sc_lang=enClearing Arrangements during eves of Christmas, New Year and Lunar New YearMon, 01 Dec 2025 17:01:40 +0800{08BD684A-37B1-46FD-B921-CA26DC546466}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_DCRC_332_2025Dec01133000?sc_lang=enSEOCH Reserve Fund Variable ContributionsMon, 01 Dec 2025 13:04:23 +0800{2CCFFE0E-9967-45DA-A52F-17B5D3E07142}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/20251127_OEC_283?sc_lang=en2026 Planned Initiatives for the Derivatives MarketThu, 27 Nov 2025 17:21:18 +0800{854B50B3-E985-41E2-9DC3-3B09D8FD3316}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/20251124_CDCO_281?sc_lang=enInstallation of Google Chrome Browser for DCASS OnlineMon, 24 Nov 2025 17:09:04 +0800{413460B7-154A-46B3-8E9A-EBB651D0B6C3}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_276_ENG_2025Nov20190309?sc_lang=enReminder on Proper Usage of Report Access PlatformThu, 20 Nov 2025 20:37:29 +0800{593F2495-2576-481A-A9B2-CD6ACF7DA382}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_DCRC_318_2025Nov05140350?sc_lang=enVolatility Scan Range Update for Weekly Stock OptionsWed, 05 Nov 2025 14:15:31 +0800{BE5E370B-627C-41C8-8A18-822FCA9C7518}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_DCRC_317_2025Nov04173340?sc_lang=enCollateral Haircut AdjustmentTue, 04 Nov 2025 17:58:13 +0800{0ACBFBCA-9587-48C4-A0A0-150A9DBD1259}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_DCRC_312_2025Nov03133000?sc_lang=enSEOCH Reserve Fund Variable ContributionsMon, 03 Nov 2025 13:05:38 +0800{FE190133-56CE-4643-A18B-42734C7C15D9}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_GRM_FRM_008_2025?sc_lang=enRevision of Cash Collateral PolicyThu, 30 Oct 2025 18:00:06 +0800{DA2B6065-4B98-4DC0-AC80-40300A4FF483}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_GRM_FRM_006_2025?sc_lang=enRevision of Stress Testing Assumptions for Reserve Fund SizingThu, 30 Oct 2025 16:59:11 +0800{2466634B-9332-46D0-8EA4-F03A2B7E8303}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/20251027_OEC_SEOCH_259?sc_lang=enDownload and Upgrade of Google Chrome Browser for DCASS OnlineMon, 27 Oct 2025 17:35:01 +0800{04B62F83-7242-4671-8AF2-3A67FF4BA4A6}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_CM2_254_2025Oct20190418?sc_lang=enOrion Cash Platform: Enhancement of CCMS Report Download – End of Parallel Run Final ReminderMon, 20 Oct 2025 19:46:47 +0800{181F3CA8-3CBE-4613-92D2-15DA0DC85C45}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_DCRC_292_2025Oct06142958?sc_lang=enMargin Parameters and Update of PC-SPAN Organisation Master File for New Stock Option ClassMon, 06 Oct 2025 14:41:12 +0800{563B54E4-A509-4BB5-A84A-4A68CA65D7D9}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_DCRC_286_2025Oct03201522?sc_lang=enUpdate of PC-SPAN Organisation Master FileFri, 03 Oct 2025 20:22:19 +0800{D5C3F2BE-6853-4C89-B856-B727FE9F137B}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_DCRC_289_2025Oct03140258?sc_lang=enCollateral Haircut AdjustmentFri, 03 Oct 2025 14:27:17 +0800{DEE86449-31CA-48CC-891E-77DCE22911BC}https://www.hkex.com.hk/Services/Circulars-and-Notices/Participant-and-Members-Circulars/SEOCH/2025/SEOCH_DCRC_283_2025Oct02133000?sc_lang=enSEOCH Reserve Fund Variable ContributionsThu, 02 Oct 2025 13:38:27 +0800