BlackRock, Inc. Increases Stake in Ciena Corporation to 8.0% Ownership

On April 24, 2026, BlackRock, Inc. filed a Schedule 13G/A with the SEC, reporting an increased stake in Ciena Corporation (CIEN). As of the event date on March 31, 2026, BlackRock beneficially owns 11,274,540 shares of Ciena's common stock, representing 8.0% of the class. This filing marks an amendment to previous disclosures, indicating a significant holding by the investment firm. According to the filing, BlackRock holds sole dispositive power over all 11,274,540 shares and sole voting power over 10,538,703 shares. The filing specifies that the shares were acquired in the ordinary course of business and not for the purpose of changing or influencing the control of the issuer. Various subsidiaries of BlackRock are identified as the owners of the shares, though no single person's interest exceeds 5% of the total outstanding common stock. The reporting person is a parent holding company based in New York.