SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer
Pursuant to Rule 13a-16 or 15d-16 of the

Securities Exchange Act of 1934

For the month of September, 2026

Commission File Number 1-14668

COMPANHIA PARANAENSE DE ENERGIA

(Exact name of registrant as specified in its charter)

Energy Company of Paraná

(Translation of Registrant's name into English)

José Izidoro Biazetto, 158
81200-240 Curitiba, Paraná
Federative Republic of Brazil
+55 (41) 3331-4011

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.  Form 20-F ___X___ Form 40-F _______

 Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.  

Yes _______ No ___X____

MATERIAL FACT | 06/26 COMPANHIA PARANAENSE DE ENERGIA - COPEL CNPJ 76.483.817/0001-20 - NIRE 41300036535 - CVM Registry no. 1431 B3 (CPLE3) /NYSE (ELPC) / LATIBEX (XCOPO) Delisting of Shares from Latibex COPEL (the “Company”) informs its shareholders and the market in general that its Board of Directors (the “Board”) approved, today, the request for delisting of the shares issued by the Company from the Latin American Securities Market (Latibex), a segment of the Madrid Stock Exchange. The delisting from Latibex is in line with Copel’s strategy of corporate simplification. The effective conclusion of the delisting and its timeline remain subject to the review, approval, and ratification by the competent authorities of BME/Latibex. Copel's shares will continue to be regularly traded on B3 S.A. - Brasil, Bolsa, Balcão and on the New York Stock Exchange (NYSE). The Company will keep its shareholders and the market timely updated of any developments regarding this process. Curitiba, September 17, 2026 Felipe Gutterres Vice-President of Finance and Investor Relations For other information, please contact the Investor Relations team: ri@copel.com or (41) 3331-4011

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date September 17, 2026

FORWARD-LOOKING STATEMENTS

This press release may contain forward-looking statements. These statements are statements that are not historical facts, and are based on management's current view and estimates of future economic circumstances, industry conditions, company performance and financial results. The words "anticipates", "believes", "estimates", "expects", "plans" and similar expressions, as they relate to the company, are intended to identify forward-looking statements. Statements regarding the declaration or payment of dividends, the implementation of principal operating and financing strategies and capital expenditure plans, the direction of future operations and the factors or trends affecting financial condition, liquidity or results of operations are examples of forward-looking statements. Such statements reflect the current views of management and are subject to a number of risks and uncertainties. There is no guarantee that the expected events, trends or results will actually occur. The statements are based on many assumptions and factors, including general economic and market conditions, industry conditions, and operating factors. Any changes in such assumptions or factors could cause actual results to differ materially from current expectations.