13D Filing: Blue Mountain Capital and Ocean Rig UDW Inc.

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CUSIP No. G66964118

(f) Mr. Feldstein, Mr. Liberman, Mr. Siderow, Mr. Smith, Mr. Dalton, Mr. Friedman, Mr. Gerstein, Ms. Gile,
Mr. Groome, Mr. Reeves and Mr. Shapiro are U.S. citizens. Mr. Linford is a South African citizen. Ms. Stevens is a British citizen.

Item 3. Source and Amount of Funds or Other Consideration

BMCM and the BlueMountain Funds were issued 9,846,060 shares of Common Stock by the Issuer on the Restructuring Effective Date (as defined in Item 4). The
information set forth in Item 4 of this Schedule 13D is hereby incorporated herein by reference.

Item 4. Purpose of Transaction.

(1) During the second quarter of 2016, the board of directors of the Issuer (the Board) and a number of creditors formed the conclusion
that the Issuers debt obligations would need to be amended or exchanged for new debt and/or equity securities; (2) on August 11, 2016, the Issuer made a public announcement stating that it was exploring restructuring options; and
(3) on March 23, 2017, a Restructuring Agreement (the Restructuring Agreement) was executed between the Issuer and certain of its creditors to implement schemes of arrangement under the Companies Law of the Cayman
Islands (the Schemes) and to appoint joint provisional liquidators, as part of the proposed restructuring.

The Schemes were sanctioned
and confirmed by the Grand Court of the Cayman Islands on September 15, 2017 (Cayman Islands time). All of the conditions of the Schemes having been fulfilled, the Schemes became effective on September 22, 2017 (Cayman Islands time) (the
Restructuring Effective Date).

Pursuant to the Schemes, and subject to the conditions described therein, BMCM and the BlueMountain
Funds acquired beneficial ownership of 9,846,060 shares of Common Stock. Following consummation of the Schemes, the Issuer intends to conduct an extraordinary general meeting to adopt an amended and restated memorandum and articles of association
to, among other things, increase the number of directors serving on its Board to seven. Pursuant to these amended articles of association: (i) if there are three or fewer holders, together with each of their affiliates, each with at least 7.5%
of the outstanding shares of Common Stock, then each will be entitled to appoint a director to the Board; and (ii) if there are more than three holders, together with each of their affiliates, each with at least 7.5% of the outstanding shares
of Common Stock, then three persons entitled to appoint a director to the Board shall be designated by the majority vote of the shares of all the 7.5% holders. If any holder, together with its affiliates, holds 17% or more of the outstanding shares
of Common Stock, such holder shall automatically be one of such three persons entitled to appoint a director to the Board.

The summary of the
Restructuring Agreement and the Schemes set forth above does not purport to be complete and is qualified in its entirety by reference to the text of the Restructuring Agreement, the press release of the Issuer dated July 21, 2017 and the press
release of the Issuer dated September 22, 2017, copies of which are being filed as Exhibits 2, 3 and 4, respectively, and are incorporated herein by reference.

The Reporting Persons acquired the Common Stock for investment purposes. The Reporting Persons acquired the Common Stock over which they exercise beneficial
ownership in the belief that the Common Stock represents an attractive investment opportunity. The Reporting Persons intend to review their investment in the Issuer on a continuing basis. Representatives of the Reporting Persons may have
discussions from time to time with the Issuer, other stockholders and third parties relating to the Issuer, strategic alternatives that may be available to the Issuer and the Issuers business, operations, assets, capitalization, financial
condition, governance, management and future plans, including in respect of one or more of the actions described in subsections (a) through (j) of Item 4 of Schedule 13D. There can be no assurance as to the outcome of any of the
discussions referred to in this Schedule 13D.

Depending on various factors, including the Issuers financial position and strategic direction, the
outcome of the discussions referenced above, actions taken by the Board, price levels of the securities of the Issuer, other investment opportunities available to the Reporting Persons, the availability and cost of debt financing, the availability
of potential business combination and other strategic transactions, conditions in the capital markets and general economic and industry conditions, the Reporting Persons may in the future take such actions with respect to their investments in the
Issuer as they deem appropriate, including acquiring or disposing of securities of the Issuer, entering into financial instruments or other agreements which increase or decrease the Reporting Persons economic exposure with respect to their
investments in the Issuer, engaging in any hedging or similar transactions with respect to such holdings and/or otherwise changing their intention with respect to any and all matters referred to in Item 4 of Schedule 13D.

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