FORM 4
[ X ] 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
                                                                                  
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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 *

Tacelli Ken
2. Issuer Name and Ticker or Trading Symbol

DATAWATCH CORP [ DWCH ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
Chief Operating Officer
(Last)          (First)          (Middle)

C/O DATAWATCH CORPORATION, 4 CROSBY DRIVE
3. Date of Earliest Transaction (MM/DD/YYYY)

12/13/2018
(Street)

BEDFORD, MA 01730
(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   12/13/2018     U    37361   D   (1) 108334   (2) D    
Common Stock   12/13/2018     D    88334   D   (3) 20000   D    
Common Stock   12/13/2018     D    20000   D   (4) 0   D    

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

Explanation of Responses:
(1)  Pursuant to the terms of the Agreement and Plan of Merger (the "Merger Agreement"), dated as of November 5, 2018, by and among Datawatch Corporation, a Delaware corporation (the "Company"), Altair Engineering Inc., a Delaware corporation (the "Altair"), and Dallas Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Altair (the "Purchaser"), and the terms of the Tender and Support Agreement, dated as of November 5, 2018, by and among Altair, Purchaser and each stockholder of the Company listed on Annex I of the Tender and Support Agreement, the reporting person disposed of these shares of the Company's Common Stock in the tender offer launched by Purchaser for a cash payment equal to $13.10 per share.
(2)  Amount no longer includes (i) 15,000 performance-based RSUs awarded to Mr. Tacelli on December 1, 2017, which did not vest, and (ii) 10,000 performance-based RSUs awarded to Mr. Tacelli on July 13, 2018, which did not vest.
(3)  Pursuant to the terms of restricted stock unit ("RSU") grant agreements, the vesting of certain RSUs was accelerated in connection with the Merger and such RSUs became fully vested effective immediately prior to the effective time of the merger contemplated by the Merger Agreement (the "Merger"). Pursuant to the terms of the Merger Agreement, each such vested RSU was cancelled in the Merger and, in lieu of any issuance of shares in settlement of such RSU, converted into the right to receive a cash payment equal to $13.10 per share (without interest and less any applicable tax withholding).
(4)  Pursuant to the terms of the Merger Agreement, unvested RSUs were cancelled at the effective time of the Merger and converted into a substitute right to receive a cash payment equal to $13.10 per share (without interest and less any applicable tax withholding) to be paid by Altair only if such conditions to vesting of the RSUs are satisfied prior to the vesting date of the RSUs; provided that if the reporting person's employment is terminated by the surviving corporation of the Merger or its affiliates prior to the vesting date under conditions that would have accelerated the vesting of such RSUs had the RSUs remained outstanding, then such vesting shall be accelerated as of the date of the termination of the reporting person's employment.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Tacelli Ken
C/O DATAWATCH CORPORATION
4 CROSBY DRIVE
BEDFORD, MA 01730


Chief Operating Officer

Signatures
/s/ Robert V. Jahrling as attorney-in-fact for Reporting Person 12/13/2018
** 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.
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