1. Available on Sierra EV Elevation Base Standard Range, Base Extended Range and Premium Extended Range, AT4 Base Extended Range and Premium Extended Range and Denali Base Standard Range and Base Extended Range models. If this vehicle was not used as a courtesy transportation vehicle by your dealer, then this vehicle may qualify for the federal new clean vehicle tax credit under Section 30D of the Inflation Reduction Act (IRA). IRS-qualified dealers eligible to offer the tax credit and participating dealers may apply the tax credit at the point of sale toward the vehicle price. See dealer for details and to confirm vehicle tax credit qualification. Your personal eligibility to claim this tax credit depends on your individual circumstances, including whether your adjusted gross income for the current or preceding taxable year exceeds the income thresholds contained in Section 30D. Buyers are advised to obtain a copy of the IRS's confirmation that a "time-of-sale" report was submitted successfully by the dealer. You should consult your tax, accounting or legal advisor to confirm your eligibility or if you have questions regarding this tax credit. This information does not constitute tax, accounting or legal advice. Credit availability and amount subject to federal law and regulations and manufacturing constraints. For information about the IRA’s federal tax credit, please visit https://www.fueleconomy.gov/feg/taxevb.shtml. Must take delivery by 9/30/2025.

1. To qualify for the GM Limited Time Special, you must: (1) be a current Costco Gold Star, Business, or Executive level Member by June 2, 2025; (2) register with Costco Auto Program online or through its call center by August 4, 2025, to receive a certificate with your unique promotion code; (3) present your certificate and unique promotion code to any Chevrolet, GMC or Cadillac dealer at time of visit; (4) take delivery between June 3, 2025, and August 4, 2025, of a new 2024, 2025, 2026 GMC Sierra EV, Hummer EV SUV, or Hummer EV Pickup to receive a $1,000 Gold Star/Business Membership Costco member-only incentive or $1,250 Executive level Membership Costco member-only incentive. Incentive will be applied at time of eligible purchase or lease and is compatible with current eligible manufacturer incentives for which you qualify. Incentive is subject to change due to vehicle inventory availability. Visit CostcoAuto.com/GM for full details. Costco and its affiliates do not sell automobiles or negotiate individual transactions. 2. To qualify for the GM Rewards Limited Time Special, and receive 10,000 GM Rewards points for Costco Gold Star, Business Membership or 12,000 GM Rewards points for Executive Membership on eligible purchases you must: (1) be a Costco Gold Star, Business, or Executive level Member by June 2, 2025; (2) be an individual consumer 18 years or older residing in the fifty (50) United States or Washington, D.C.; (3) be a GM Rewards Member or enroll in the GM Rewards Program within 30 days of the purchase of a qualifying vehicle at experience.gm.com/createaccount; (4) register with Costco Auto Program online or through its call center by August 4, 2025, to receive a certificate with your unique promotion code; (5) present your certificate and unique promotion code to any GMC dealer at time of visit; (6) take delivery between June 3, 2025, and August 4, 2025, of a new 2024, 2025, 2026 GMC Sierra EV, Hummer EV SUV, or Hummer EV Pickup through the GM Limited Time Special. GM Rewards Members also earn 1 point for every $5 spent on a new GM lease or purchase, based on the vehicle MSRP and excluding taxes and fees. Points will be awarded within 45 days of your qualifying vehicle purchase. GM Limited Time Special Incentive is subject to change due to vehicle inventory availability. Visit CostcoAuto.com/GM for full details. Costco and its affiliates do not sell automobiles or negotiate individual transactions.

1. Length of contract limited. Some customers may not qualify. Not available with lease and some other offers. Take new retail delivery by 8/4/25. 2. AVAILABLE ON THE TURBOMAXTM ENGINE. 3. Tax, title, license, and dealer fees extra. Dealer sets final price. Not available with lease and some other offers. Take new retail delivery by 8/4/25. 4. AVAILABLE ON THE TURBOMAXTM ENGINE. MUST BE A CURRENT OWNER OF A 2011 MODEL YEAR OR NEWER BUICK OR GMC VEHICLE OR A CURRENT LESSEE OF A 2020 MODEL YEAR OR NEWER BUICK OR GMC VEHICLE THROUGH GM FINANCIAL FOR AT LEAST 30 DAYS PRIOR TO NEW VEHICLE SALE. Not available with lease and some other offers. Take new retail delivery by 8/4/25.

1. Length of contract limited. Some customers may not qualify. Not available with lease and some other offers. Take new retail delivery by 8/4/25. 2. MUST BE A CURRENT OWNER OF A 2011 MODEL YEAR OR NEWER NON-GM VEHICLE OR A CURRENT LESSEE OF A 2020 MODEL YEAR OR NEWER NON-GM VEHICLE FOR AT LEAST 30 DAYS PRIOR TO NEW VEHICLE SALE. Not available with lease and some other offers. Take new retail delivery by 8/4/25. 3. Deferred monthly payments for 90 days. Excludes residents of PA. Must finance with GM Financial. Some customers may not qualify. Down payment required at signing, if applicable. Finance charges accrue from date of financing. Not available with lease and some other offers. Take new retail delivery by 8/4/25.

1. Available for eligible individual buyers on new qualifying vehicles assembled in the US. Only applies to interest paid in tax years 2025-2028 on new debt contracted after 12/31/2024. Tax deduction subject to change and filing requirements. Income restrictions and other restrictions and limitations may apply. Consult your tax, legal, or accounting professional if you have questions. This information does not constitute tax, accounting, or legal advice. Deduction subject to federal laws and regulations and manufacturing constraints.