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

Bully 1 (Switzerland) GmbH

Noble BD LLC

Noble Cayman SCS Holding Ltd

Noble Contracting II GmbH

Noble Drilling (Guyana) Inc.

Noble Drilling (Norway) AS

Noble Drilling (TVL) Ltd.

Noble Drilling (U.S.) LLC

Noble Drilling Doha LLC (49% of equity pledged)

Noble Drilling International GmbH

Noble Drilling Services LLC (fka Noble Drilling Services Inc.)

Noble DT LLC

Noble International Finance Company

Noble Leasing (Switzerland) GmbH

Noble Leasing III (Switzerland) GmbH

Noble Resources Limited

Noble Rig Holding 2 Limited

Noble Rig Holding I Limited

Noble SA Limited

Noble Services Company LLC

Noble Services International Limited

Pacific Drilling S.A.