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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1486957	Bwx Technologies Inc.	BWXT	()	4

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1193350	S Clifton Robbins	646 Steamboat Rd. Greenwich CT 06830	Yes	No	No	Yes
1325256	Blue Harbour Group, L.p.	646 Steamboat Rd. Greenwich CT 06830	Yes	No	No	Yes
1325257	Blue Harbour Holdings, Llc	646 Steamboat Rd. Greenwich CT 06830	Yes	No	No	Yes

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, Par Value $0.01 Per Share ("Common Stock")	Disposition	2017-03-07	5,273,159	$45.67	5,287,927	No	4	S	Indirect	See footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See footnotes

Footnotes

This Form 4 is filed by Blue Harbour Group, L.P. (the "Manager"), Blue Harbour Holdings, LLC ("Manager GP") and Clifton S. Robbins. Manager GP is the general partner of Manager. Mr. Robbins is the managing member of Manager GP.
Pursuant to Rule 16a-1 under the Securities Exchange Act of 1934, as amended (the "Act"), each of the Reporting Persons may be deemed to be the beneficial owner of the securities reported herein to the extent of his or its pecuniary interest therein, but disclaims beneficial ownership in excess of such amount; and pursuant to Rule 16a-1(a)(4) under the Act, this filing shall not be deemed an admission that any of the Reporting Persons is, for purposes of Section 16 of the Act or otherwise, the beneficial owner of any securities reported herein in excess of such amount.