X0304 4 2012-02-15 0 0001038133 HESKA CORP HSKA 0001471373 CMC Master Fund, L.P. C/O C.M. CAPITAL ADVISORS, LLC 525 UNIVERSITY AVENUE, SUITE 200 PALO ALTO CA 94301 0 0 1 0 0001471663 CMC Master Fund Partners, LLC C/O C.M. CAPITAL ADVISORS, LLC 525 UNIVERSITY AVENUE, SUITE 200 PALO ALTO CA 94301 0 0 1 0 0001471662 C.M. Capital Advisors, LLC 525 UNIVERSITY AVENUE, SUITE 200 PALO ALTO CA 94301 0 0 1 0 0001471661 C.M. Capital Corp 525 UNIVERSITY AVENUE, SUITE 200 PALO ALTO CA 94301 0 0 1 0 Common Stock 2012-02-15 4 S 0 43200 8.1509 D 735845 I See Footnote Common Stock 2012-02-16 4 S 0 156800 8.1504 D 579045 I See Footnote Reflects a 10:1 reverse stock split of the Issuer effective December 30, 2010. 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. C.M. Capital Advisors, LLC, and C.M. Capital Corporation, which were also filing parties on the original Form 3, no longer have an indirect beneficial ownership interest in these shares following a reorganization among related parties and accordingly believe they will no longer be subject to Section 16. Each of the reporting persons disclaims beneficial ownership of such securities, except to the extent of its proportionate pecuniary interest therein. /s/ Elizabeth Hammack, Authorized Officer 2012-03-01