Ownership Submission
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

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
CMC Master Fund, L.P.
   2. Issuer Name and Ticker or Trading Symbol
HESKA CORP [HSKA] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O C.M. CAPITAL ADVISORS, LLC, 525 UNIVERSITY AVENUE, SUITE 200		 3. Date of Earliest Transaction (Month/Day/Year)
10/04/2012
(Street)

PALO ALTO, CA 94301		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 10/04/2012   S   9,600 D $ 9.5022 (1) 558,443 I See Footnote (2)
Common Stock 10/05/2012   S   14,462 D $ 9.5339 (3) 543,981 I See Footnote (2)
Common Stock 10/08/2012   S   2,452 D $ 9.5 541,529 I See Footnote (2)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction 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
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(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

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
CMC Master Fund, L.P.
C/O C.M. CAPITAL ADVISORS, LLC
525 UNIVERSITY AVENUE, SUITE 200
PALO ALTO, CA 94301		     X    
CMC Master Fund Partners, LLC
C/O C.M. CAPITAL ADVISORS, LLC
525 UNIVERSITY AVENUE, SUITE 200
PALO ALTO, CA 94301		     X    

Signatures

 CMC Master Fund Partners, LLC, By: /s/ Fernando Sucre, Senior V.P., CFO   10/09/2012
**Signature of Reporting Person Date
 CMC Master Fund, L.P., By: CMC Master Fund Partners, LLC, its General Partner, By: /s/ Fernando Sucre, Senior V.P., CFO   10/09/2012
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) The reported price is based on a weighted average of multiple same-day transactions with prices ranging from $9.50 to $9.54 per share. The reporting persons undertake to provide upon request to the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer full information regarding the number of shares sold at each separate price.
(2) These shares are held directly by CMC Master Fund, L.P., and indirectly by CMC Master Fund Partners, LLC, as the general partner of CMC Master Fund, L.P. Each of the reporting persons disclaims beneficial ownership of such securities, except to the extent of its proportionate pecuniary interest therein.
(3) The reported price is based on a weighted average of multiple same-day transactions with prices ranging from $9.50 to $9.58 per share. The reporting persons undertake to provide upon request to the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer full information regarding the number of shares sold at each separate price.

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