The third step in your journey of becoming a supplier, is the SLAC registration. In order to complete your registration, you must have a D-U-N-S number and a completed SAM Registration, which must be active and current. Once you have completed Steps 1 and 2 you can go to SLAC's Supplier Registration Portal to become an approved supplier. You will also need your W-9 or W-8 to register at SLAC. Completing the SLAC Registration does not guarantee solicitations or awards will be sent to your organization.