FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * McCarthy Daniel M.   2. Issuer Name and Ticker or Trading Symbol MCDERMOTT INTERNATIONAL INC [MDR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) EVP, Lummus Technology (Last) (First) (Middle) C/O MCDERMOTT INTERNATIONAL, INC., 757 N. ELDRIDGE PARKWAY 3. Date of Earliest Transaction (Month/Day/Year) 05/10/2018 (Street) HOUSTON, TX 77079 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/10/2018   A   74,137 A (1) 74,137 D   Common Stock 05/10/2018   A   44 A (1) 44 I 401K Plan

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Restricted Stock Units

(2)

05/10/2018

A

99,103

(3)

(3)

Common Stock

99,103

$ 0

99,103

D

Stock Options (Right to Buy)

$ 8.19

05/10/2018

A

26,634

02/20/2010

02/20/2019

Common Stock

26,634

$ 0 (4)

26,634

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
McCarthy Daniel M. C/O MCDERMOTT INTERNATIONAL, INC. 757 N. ELDRIDGE PARKWAY HOUSTON, TX 77079			EVP, Lummus Technology

Signatures

/s/ John M. Freeman, by Power of Attorney		05/14/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Pursuant to the Business Combination Agreement, dated as of December 18, 2017 (the "BCA") to which the Issuer and Chicago Bridge & Iron Company N.V. ("CB&I") are parties, each ordinary share of CB&I beneficially owned by the Reporting Person at the effective time of the transactions contemplated by the BCA was exchanged for .82407 ordinary shares of the Issuer (the Exchange Ratio).
(2)	The restricted units were granted to the reporting person on February 14, 2018 by CB&I. Each restricted stock unit represents a right to receive the value of one share of MDR common stock. Pursuant to the BCA, each restricted stock unit beneficially owned by the Reporting Person at the effective time of the transactions contemplated by the BCA was exchanged for .82407 restricted stock units of the Issuer (the Exchange Ratio).
(3)	The restricted stock units vest in three equal annual installments beginning February 14, 2019.
(4)	The stock options were originally options to purchase CB&I stock. Pursuant to the BCA, each stock option beneficially owned by the Reporting Person at the effective time of the transactions contemplated by the BCA was exchanged for .82407 stock options of the Issuer (the Exchange Ratio).

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