W&T OFFSHORE INC

We attempt to minimize our credit risk exposure to purchasers of our oil and natural gas, joint interest owners, derivative counterparties and other third-party entities through formal credit policies, monitoring procedures, and letters of credit or guarantees when considered necessary.The following table identifies customers from whom we derived 10% or more of our receipts from sales of crude oil, NGLs and natural gas: Year Ended December 31, 2021 2020 2019 Customer BP Products North America 34% 39% 40%Chevron - Texaco 14%** ** Mercuria Energy America Inc. ** 10%** Shell Trading (US) Co./ Shell Energy N.A. ** ** 11%Vitol Inc. ** ** 12%Williams Field Services 11% 13%** **Less than 10% We believe that the loss of any of the customers above would not result in a material adverse effect on our ability to market future oil and natural gas production as replacement customers could be obtained in a relatively short period of time on terms, conditions and pricing substantially similar to those currently existing.

Vitol Inc. ** 12 % 14 %

Vitol Inc. 12 % 14 % 15 %

Vitol Inc. 14 % 15 % 20 %

We attempt to minimize our credit risk exposure to purchasers of our oil and natural gas, joint interest owners, derivative counterparties and other third-party entities through formal credit policies, monitoring procedures, and letters of credit or guarantees when considered necessary.The following table identifies customers from whom we derived 10% or more of our receipts from sales of crude oil, NGLs and natural gas: Year Ended December 31, 2021 2020 2019 Customer BP Products North America 34% 39% 40%Chevron - Texaco 14%** ** Mercuria Energy America Inc. ** 10%** Shell Trading (US) Co./ Shell Energy N.A. ** ** 11%Vitol Inc. ** ** 12%Williams Field Services 11% 13%** **Less than 10% We believe that the loss of any of the customers above would not result in a material adverse effect on our ability to market future oil and natural gas production as replacement customers could be obtained in a relatively short period of time on terms, conditions and pricing substantially similar to those currently existing.

Shell Trading (US) Co./ Shell Energy N.A. ** 11 % 30 %

Shell Trading (US) Co./ Shell Energy N.A. 11 % 30 % 46 %

The following table identifies customers whose total represented 10% or more of the Company’s receipts from sales of crude oil, NGLs and natural gas: Year Ended December 31, 2022 2021 2020 Customer BP Products North America 31% 34% 39%Chevron - Texaco 13% 14%** Mercuria Energy America Inc. ** ** 10%Williams Field Services ** 11% 13% **Less than 10%The loss of any of the customers above would not result in a material adverse effect on the Company’s ability to market future oil and natural gas production as replacement customers could be obtained in a relatively short period of time on terms, conditions and pricing substantially similar to those currently existing.Accounts Receivables and Allowance for Credit LossesAccounts Receivable are recorded at historical cost, net of an allowance for credit losses, to reflect the net amounts to be collected.

The following table identifies customers whose total represented 10% or more of the Company’s receipts from sales of crude oil, NGLs and natural gas: Year Ended December 31, 2022 2021 2020 Customer BP Products North America 31% 34% 39%Chevron - Texaco 13% 14%** Mercuria Energy America Inc. ** ** 10%Williams Field Services ** 11% 13% **Less than 10%The loss of any of the customers above would not result in a material adverse effect on the Company’s ability to market future oil and natural gas production as replacement customers could be obtained in a relatively short period of time on terms, conditions and pricing substantially similar to those currently existing.Accounts Receivables and Allowance for Credit LossesAccounts Receivable are recorded at historical cost, net of an allowance for credit losses, to reflect the net amounts to be collected.