W-9 Forms

The W-8/W-9 form is required for all Oasis vendors in order to properly report earnings to the IRS. Oasis will not pay a vendor who does not have a completed W-8/W-9 on file. New vendors can submit their completed W-8/W-9 form to Oasis via email (TIN@oasispetroleum.com) or to our mailing address listed below.

Oasis Petroleum
Attn: Accounts Payable
1001 Fannin, Suite 1500
Houston, TX 77002


Form W-8 Link        Form W-9