Form 4 Filing for John S. Montalbano

This filing details a Form 4 submission by John S. Montalbano, a director at AbCellera Biologics Inc. (ABCL). On June 11, 2026, Montalbano acquired 111,701 share options with a right to buy, priced at $0.00 per share. These options are set to vest and become exercisable at the 2027 Annual General Meeting, contingent upon his continued service to the company. The shares are linked to the underlying Common Shares of AbCellera Biologics Inc. Following this transaction, Montalbano holds a total of 1,141,544 shares. The filing was signed by his attorney-in-fact on June 12, 2026. The footnote F1 indicates that the vesting is tied to the 2027 Annual General Meeting and continued service.