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
                                                                                  
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response... 0.5
                      
Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

THOMPSON DAVID W 		2. Issuer Name and Ticker or Trading Symbol

ORBITAL ATK, INC. [ OA ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
President and CEO
(Last)          (First)          (Middle)

C/O ORBITAL ATK, 45101 WARP DRIVE 		3. Date of Earliest Transaction (MM/DD/YYYY)

2/21/2018
(Street)

DULLES, VA 20166
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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   2/21/2018     A (1)    11961   A $0   107664   (2) D    
Common Stock   2/21/2018     F (1)    4253   D $131.80   103411   (2) D    
Common Stock   2/21/2018     A (3)    188   A $0   103599   (2) D    
Common Stock   2/21/2018     F (3)    188   D $131.80   103411   (2) D    
Common Stock                  10147   I   By Spouse  
Common Stock                  2374   I   By 401(k) Plan  

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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
Deferred Stock Units     (4) 2/21/2018     A      7786         (4)   (4) Common Stock   7786   $0   7786   D    

Explanation of Responses:
(1)  Shares acquired represent payment of a performance share award (PSA) under the Issuer's 2005 Stock Incentive Plan, and shares disposed represent shares withheld from the PSA to pay withholding taxes.
(2)  31,036 of these shares are subject to certain restrictions including possible forfeiture under Orbital ATK, Inc.'s stock incentive plans.
(3)  Shares simultaneously acquired and disposed represent shares withheld to pay Medicare taxes in connection with the payment of a PSA and the reporting person's deferral of the remaining performance shares under the Issuer's Nonqualified Deferred Compensation Plan (NQDCP) (reported in Table II of this Form).
(4)  The Deferred Stock Units were credited to the reporting person's account under the Issuer's NQDCP in lieu of a payment by the Issuer of performance shares under the Issuer's 2005 Stock Incentive Plan. The number of units credited to the reporting person's account was determined on a 1-for-1 basis equal to the number of shares of common stock that would have been paid, reduced by the number of shares having a value equal to the Issuer's Medicare tax withholding obligation as a result of the deferral of the payment of the shares. The units will be settled 100% in shares of the Issuer's common stock following the reporting person's termination of employment or such other date specified by the reporting person under the terms of the NQDCP.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
THOMPSON DAVID W
C/O ORBITAL ATK
45101 WARP DRIVE
DULLES, VA 20166 		X
President and CEO

Signatures
/s/ Richard N. Osborne, Attorney-in-Fact 2/23/2018
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
Orbital Atk, Inc. (delisted) (NYSE:OA)
Historical Stock Chart
From Jun 2024 to Jul 2024 Click Here for more Orbital Atk, Inc. (delisted) Charts.
Orbital Atk, Inc. (delisted) (NYSE:OA)
Historical Stock Chart
From Jul 2023 to Jul 2024 Click Here for more Orbital Atk, Inc. (delisted) Charts.