Form 4 Filing for Barry Mainz

Barry Mainz, a director at BLACKBERRY Ltd, acquired 9,433 Deferred Share Units (DSUs) on August 31, 2026. These DSUs are economically equivalent to common shares and will vest at BlackBerry's discretion following the cessation of Mainz's service as a director. The DSUs become payable in cash or shares. Following this transaction, Mainz holds 93,263 DSUs. The transaction was reported on September 1, 2026.