Pacific Drilling (PACD) S-1/AIPO registration (amended)

Exhibit 22.1

List of Guarantor Subsidiaries and Affiliate Securities Pledged as Collateral

As of the date of the registration statement of which this Exhibit 22.1 is a part, the 11%/ 13%/ 15% Senior Secured PIK Toggle Notes due 2028 (the “Notes”) issued by Noble Finance Company, an exempted company incorporated in the Cayman Islands with limited liability (“Finco”), are fully and unconditionally guaranteed by each of the following wholly-owned subsidiaries of Finco (the “Guarantors”).

Concurrently with the issuance of the Notes, Finco and certain of its subsidiaries entered into pledge, collateral and mortgage agreements. Pursuant to the terms of these agreements, the Notes are secured on a second-priority basis by a pledge of the equity interests of the Guarantors and substantially all of the other direct subsidiaries of Finco and the Guarantors. Unless otherwise indicated, all pledges are 100% of the equity interests of the Guarantors.

Guarantors