X0508 4 2025-11-13 0 0001907982 D-Wave Quantum Inc. QBTS 0001974777 Nguyen Diane 2650 EAST BAYSHORE ROAD PALO ALTO CA 94303 0 1 0 0 EVP, Chief Legal Officer & GC 1 Common Stock, par value $0.0001 per share ("Common Stock") 2025-11-13 4 S 0 20000 23.6641 D 568845 D Common Stock, par value $0.0001 per share ("Common Stock") 2025-11-13 4 S 0 2803 23.1744 D 566042 D The sale of 20,000 shares of Common Stock reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 14, 2025. The sales price reported is the weighted average sale price for the number of shares sold. These shares were sold in multiple transactions at prices ranging from $23.00 to $25.26, inclusive. Full information regarding the number of shares sold at each separate price will be supplied upon request by Securities and Exchange Commission Staff, the Issuer or a security holder of the Issuer. Includes 224,613 shares of unvested restricted stock units. Represents the number of shares of Common Stock required to be sold to cover the statutory tax withholding obligations in connection with the vesting of restricted stock units. This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of statutory tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person. The sales price reported is the weighted average sale price for the number of shares sold. These shares were sold in multiple transactions at prices ranging from $23.00 to $23.435, inclusive. Full information regarding the number of shares sold at each separate price will be supplied upon request by Securities and Exchange Commission Staff, the Issuer or a security holder of the Issuer. /s/ Diane Nguyen 2025-11-14