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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
708819	Mcdermott International Inc	MDR	Fabricated Plate Work (Boiler Shops) (3443)	720593134

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1199543	Iii T John Nesser	757 N. Eldridge Parkway Houston TX 77079	Evp, Coo	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2011-03-04	8,275	$0.00	333,775	No	4	M	Direct
Common Stock	Disposition	2011-03-04	2,188	$25.64	331,587	No	4	F	Direct
Common Stock	Acquisiton	2011-03-05	12,221	$0.00	343,808	No	4	M	Direct
Common Stock	Disposition	2011-03-05	3,541	$25.64	340,267	No	4	F	Direct
Common Stock	Acquisiton	2011-03-05	15,917	$0.00	356,184	No	4	M	Direct
Common Stock	Disposition	2011-03-05	5,801	$25.74	350,383	No	4	F	Direct
Common Stock	Disposition	2011-03-07	40,000	$25.37	310,383	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	F	Direct
No	4	M	Direct
No	4	F	Direct
No	4	M	Direct
No	4	F	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Units	Disposition	2011-03-04	8,275	$0.00	8,275	$0.00
Common Stock	Restricted Stock Units	Disposition	2011-03-05	12,221	$0.00	12,221	$0.00
Common Stock	Restricted Stock Units	Disposition	2011-03-05	15,917	$0.00	15,917	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
16,553	2011-03-04	2011-03-04	No	4	M	Direct
6,295			No	4	M	Direct
7,957	2011-03-05	2011-03-05	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	14,479	Indirect	401K Plan
Common Stock	200,000	Indirect	By GRAT

Footnotes

Based upon units held in 401K Plan and the fair market value of MDR common stock as of March 4, 2011.
On October 27, 2010, the reporting person contributed 200,000 shares of MDR common stock to a grantor retained annuity trust of which the reporting person is Trustee and has indirect beneficial ownership.
Each restricted stock unit represents a contingent right to receive one share of MDR common stock.
The restricted stock units vest in three equal annual installments beginning March 4, 2011.
66% of these outstanding Restricted Stock Units vested on March 5, 2011 in connection with Mr. Nesser attaining retirement eligibility. The remainder of these Restricted Stock Units vest on March 5, 2012.
The restricted stock units vest in three equal annual installments beginning March 5, 2010. In addition, 50% of the then outstanding restricted stock units vested in connection with Mr. Nesser attaining retirement eligiblity.