| 17 Aug 2026, 19:31 | Managing Director & CEO Annual Incentive Package Review | Company Administration | — | 12008 |
| 7 Aug 2026, 19:01 | Canyon-3 Drilling Update | Company Update | MS | 11001 |
| 31 July 2026, 18:36 | OMA's Play-Defining Campaign Commences Drilling at Canyon-3 | Company Update | MS | 11001 |
| 28 July 2026, 18:37 | Quarterly Activities Report and Appendix 5B | Quarterly Reports | MS | 04004, 05004 |
| 21 July 2026, 19:13 | OMA Commences Transformational Taroom Trough Drill Program | Company Update | MS | 11001 |
| 11 July 2026, 03:12 | Change of Director's Interest Notice - SH | Director Interests | — | 02009 |
| 11 July 2026, 03:10 | Change of Director's Interest Notice - PS | Director Interests | — | 02009 |
| 11 July 2026, 03:09 | Change of Director's Interest Notice - AH | Director Interests | — | 02009 |
| 11 July 2026, 03:04 | Change of Director's Interest Notice - QF | Director Interests | — | 02009 |
| 11 July 2026, 03:03 | Change of Director's Interest Notice - MH | Director Interests | — | 02009 |
| 8 July 2026, 03:55 | Cleansing notice under section 708A of the Corporations Act | Securities Administration | — | 06018 |
| 8 July 2026, 03:53 | Application for quotation of securities - OMA | Other | — | 06020 |
| 8 July 2026, 03:48 | Application for quotation of securities - OMA | Other | — | 06020 |
| 25 June 2026, 19:39 | Change in substantial holding - Ilwella | Substantial Holders | — | 02002 |
| 25 June 2026, 19:36 | Change in substantial holding - Tri-Star | Substantial Holders | — | 02002 |
| 25 June 2026, 19:33 | Change of Director's Interest Notice - QF | Director Interests | — | 02009 |
| 25 June 2026, 19:31 | Cleansing notice under section 708A of the Corporations Act | Securities Administration | — | 06018 |
| 25 June 2026, 19:30 | Application for quotation of securities - OMA | Other | — | 06020 |
| 25 June 2026, 19:02 | Investor Presentation - Unlocking a New Basin-Scale Play | Presentations | MS | 03026 |
| 20 June 2026, 00:55 | Results of Meeting | Meetings & Governance | — | 08003 |
| 2 June 2026, 02:46 | Change of Director's Interest Notice - QF | Director Interests | — | 02009 |
| 19 May 2026, 19:13 | OMA Commences Civil Works in Advance of 26/27 Drill Program | Company Update | — | 11001 |
| 13 May 2026, 03:37 | EGM Access Letter, Notice of Meeting and Proxy | Meetings & Governance | — | 08004, 08007 |
| 9 May 2026, 02:47 | Change of Director's Interest Notice - SH | Director Interests | — | 02009 |
| 9 May 2026, 02:47 | Change of Director's Interest Notice - PS | Director Interests | — | 02009 |
| 9 May 2026, 02:39 | Change of Director's Interest Notice - AH | Director Interests | — | 02009 |
| 9 May 2026, 02:37 | Change of Director's Interest Notice - QF | Director Interests | — | 02009 |
| 9 May 2026, 02:35 | Change of Director's Interest Notice - MH | Director Interests | — | 02009 |
| 9 May 2026, 02:34 | Change of Director's Interest Notice - TB | Director Interests | — | 02009 |
| 5 May 2026, 18:14 | Change in substantial holding - Ilwella | Substantial Holders | — | 02002 |
| 5 May 2026, 18:13 | Change in substantial holding - Tri-Star | Substantial Holders | — | 02002 |
| 2 May 2026, 03:16 | Notification regarding unquoted securities - OMA | Other | — | 06021 |
| 2 May 2026, 03:03 | Cleansing notice under section 708A of the Corporations Act | Securities Administration | — | 06018 |
| 2 May 2026, 03:00 | Application for quotation of securities - OMA | Other | — | 06020 |
| 2 May 2026, 02:54 | Application for quotation of securities - OMA | Other | — | 06020 |
| 1 May 2026, 19:46 | Cleansing notice under section 708A of the Corporations Act | Securities Administration | — | 06018 |
| 1 May 2026, 19:43 | Application for quotation of securities - OMA | Other | — | 06020 |
| 29 Apr 2026, 18:46 | Quarterly Activities Report and Appendix 5B | Quarterly Reports | MS | 04003, 05003 |
| 23 Apr 2026, 20:13 | Proposed issue of securities - OMA | Securities Administration | — | 06013 |
| 23 Apr 2026, 20:13 | Proposed issue of securities - OMA | Securities Administration | — | 06013 |
| 23 Apr 2026, 20:13 | OMA Raise A$60m to Fund Upgraded 26/27 Taroom Trough Program | Capital Raising | MS | 03026, 06003, 09014 |
| 21 Apr 2026, 18:54 | Trading Halt | Trading Halt / Suspension | MS | 09007 |
| 10 Apr 2026, 02:41 | Updated Securities Trading Policy | Company Administration | — | 14013 |
| 3 Apr 2026, 05:35 | Proposed issue of securities - OMA | Securities Administration | — | 06013 |
| 13 Mar 2026, 02:05 | Half Yearly Report and Accounts | Financial Results | — | 03009, 03010, 03015, 03019 |
| 3 Mar 2026, 19:39 | OMA Secures H&P Rig for Expanded Taroom Trough Drill Program | Company Update | MS | 11001 |
| 2 Mar 2026, 20:00 | OMA Bal Sheet ready for Drilling, Receipt $10.56M R&D Refund | Company Administration | — | 12008 |
| 18 Feb 2026, 19:13 | Investor Presentation - North American Prospect Expo | Presentations | — | 03026 |
| 10 Feb 2026, 19:41 | OMA Awarded Large New Taroom Trough Acreage Setting Up 2026 | Company Update | MS | 11001, 14014 |
| 29 Jan 2026, 19:36 | Quarterly Activities Report and Appendix 5B | Quarterly Reports | MS | 04002, 05002 |