SECURITIES AND EXCHANGE COMMISSIONSEC FORM 17-C

CURRENT REPORT UNDER SECTION 17
OF THE SECURITIES REGULATION CODE
AND SRC RULE 17.2(c) THEREUNDER

1. Date of Report (Date of earliest event reported)

Nov 11, 2026

2. SEC Identification Number

0000091447

3. BIR Tax Identification No.

0001903240000

4. Exact name of issuer as specified in its charter

SEMIRARA MINING AND POWER CORPORATION

5. Province, country or other jurisdiction of incorporation

Philippines

6. Industry Classification Code(SEC Use Only)

7. Address of principal office

2/F DMCI PLAZA, 2281 DON CHINO ROCES AVENUE, MAKATI CITY Postal Code 1231

8. Issuer's telephone number, including area code

8246-2280/8246-2238

9. Former name or former address, if changed since last report

N/A

10. Securities registered pursuant to Sections 8 and 12 of the SRC or Sections 4 and 8 of the RSA

Title of Each Class	Number of Shares of Common Stock Outstanding and Amount of Debt Outstanding
Common	4,250,547,620

11. Indicate the item numbers reported herein

9

The Exchange does not warrant and holds no responsibility for the veracity of the facts and representations contained in all corporate disclosures, including financial reports. All data contained herein are prepared and submitted by the disclosing party to the Exchange, and are disseminated solely for purposes of information. Any questions on the data contained herein should be addressed directly to the Corporate Information Officer of the disclosing party.

Semirara Mining and Power CorporationSCC

PSE Disclosure Form 4-30 - Material Information/Transactions References: SRC Rule 17 (SEC Form 17-C) and
Sections 4.1 and 4.4 of the Revised Disclosure Rules

Subject of the Disclosure
Updates on Mine Coal Operations
Background/Description of the Disclosure
The Company respectfully reports the following material developments concerning its coal mining operations on Semirara Island, Caluya, Antique, under Coal Operating Contract No. 5 (“COC 5”): I. Temporary Suspension of Acacia Mine Operations On November 10, 2026, the Company temporarily suspended mining operations at Acacia Mine amid persistent seawater inflows and challenging ground conditions, as part of its precautionary approach to mine safety. Over the past year, seawater inflows have reached a peak levels of nearly 40,000 cubic meters per hour, equivalent to 16 Olympic-sized pools, exceeding the mine's current pumping capacity. During the suspension, the Company continues to undertake measures to address these challenges and preserve the mine’s operational viability. These include the construction and maintenance of a cut-off wall and continued pumping operations to manage water levels and ground stability. The Company remains focused on improving conditions at Acacia to enable safe resumption of mining operations, subject to the effective management of seawater inflows. Managing these conditions over the longer term would require substantial investments in pumping equipment, power systems, and other infrastructure. COC 5 is set to expire on July 14, 2027. II. Operational Impact With Acacia operations suspended, coal production is currently concentrated at the Narra Mine. As of November 10, 2026, the Company has already reached its full-year coal production target of 12 to 13 million metric tons, consistent with its approved work program. The Company continues to undertake measures to improve operating conditions at Acacia, while coordinating with the Department of Energy (DOE) and keeping the Exchange and the investing public informed of further material developments. III. Effect on Financial Condition The Company intends to resume operations at Acacia Mine as soon as conditions safely permit. Given the temporary nature of the suspension and ongoing efforts to address the seawater inflows, the Company is not yet in a position to reasonably assess the potential financial impact. Any material developments will be disclosed accordingly.
Other Relevant Information
See attached SEC Form 17-C.