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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
866121	Orbital Atk Inc.	OA	Guided Missiles & Space Vehicles & Parts (3760)	411672694

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1313857	E Blake Larson	C/O Orbital Atk, Inc. 45101 Warp Drive Dulles VA 20166	Chief Operating Officer	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	Explanation
Common Stock	Acquisiton	2015-06-04	5,000	$48.83	30,087	No	4	M	Direct
Common Stock	Disposition	2015-06-04	5,000	$72.69	25,087	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (right to buy)	Disposition	2015-06-04	5,000	$0.00	5,000	$48.83

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2011-09-08	2015-09-08	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	19,000	Indirect	By Family Trust
Common Stock	631	Indirect	By Spousal Trust
Common Stock	184	Indirect	By Family Trust

Footnotes

8,025 of these shares are subject to certain restrictions including possible forfeiture under Orbital ATK, Inc.'s (formerly Alliant Techsystems Inc.'s) 2005 Stock Incentive Plan.
This is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $72.52 to $72.93, inclusive. The reporting person undertakes to provide Orbital ATK, Inc., any security holder of Orbital ATK, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
These shares are held in a family trust, of which the reporting person's spouse and children are the beneficiaries and the reporting person is the settlor and trustee.
These shares are held in a trust of which the reporting person's spouse is the trustee and the reporting person is the beneficiary.
These shares represent the reporting person's proportional interest as a beneficiary of a family trust.