Companhia Paranaense De EnergiaBMFBOVESPA: CPLE3

Notice to Shareholders 03/26 - First dividend distribution of 2026

· Issued by Companhia Paranaense De Energia




NOTICE TO SHAREHOLDERS| 03/26 COMPANHIA PARANAENSE DE ENERGIA - COPEL

CNPJ/MF 76.483.817/0001-20 - NIRE 41300036535 - CVM Registration 1431-1 B3 (CPLE3) / NYSE (ELPC) / LATIBEX (XCOPO)

First dividend distribution of 2026 COMPANHIA PARANAENSE DE ENERGIA - COPEL ("Company") hereby informs its shareholders and the market in general that its Board of Directors has approved, as of today, the distribution of earnings in the form of Interest on Equity ("IoE") in the gross amount of R$ 706,000,000.00 (seven hundred and six million reais), based on the retained earnings reserve account as reported in the Financial Statements as of December 31, 2025, as follows:

JCP

Payment Date

September 30, 2026

Gross amount per common share - ON

R$ 0.23770345099

Note: Complementary Law No. 224/2025 amended Law No. 9,249/1995 and increased the withholding tax on interest income from 15% to 17.5%, effective as of January 1, 2026.

RECORD DATE: Shareholders of the Company as of the record date of April 29, 2026, shall be entitled to the declared IoE, subject to trades executed up to and including that date ("Record Date").

EX-DIVIDEND DATE: The shares will be traded ex-dividend as of April 30, 2026, inclusive.

PAYMENT METHOD: Payment of the IoE will be made by crediting the bank checking account listed in the shareholder's records. Therefore, shareholders must keep their bank information up to date with their custodian. SERVICE:

Bookkeeping Agent: Banco Itaú (Asset Bookkeeping)

Avenida Brigadeiro Faria Lima, 3,500, 3rd floor, SP ZIP Code: 04538-132

Major Cities and Metropolitan Areas: 3003-9285 (WhatsApp) / Other Regions: 0800 720 9285 Email: preatendimentoescritural@itau-unibanco.com.br

Overseas Custodian Bank: The Bank of New York Mellon 101 Barclay Street, 22ndFloor / New York - NY - 10286 Phone: (212) 815-7118

Email: cassandra.miranda@bnymellon.com

Curitiba, April 15, 2026

Felipe Gutterres

Vice President of Finance and Investor Relations

For further information, please contact the Investor Relations team: ri@copel.com | (41) 3331-4011

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