| SC 13G/A | 2020-02-12 | VANGUARD GROUP INC | HESKA CORP | 475,146 | 6.1% | EDGAR |
| SC 13G/A | 2020-02-07 | FMR LLC | HESKA CORP | 238,730 | 3.0% | EDGAR |
| SC 13G/A | 2020-02-04 | BlackRock Inc. | HESKA CORP | 1,139,170 | 14.6% | EDGAR |
| SC 13D/A | 2019-04-29 | HESKA CORP | HESKA CORP | 584,331 | 7.5% | EDGAR |
| SC 13G/A | 2019-03-08 | ALGER ASSOCIATES INC | HESKA CORP | 841,359 | 11.1% | EDGAR |
| SC 13G/A | 2019-02-14 | Neuberger Berman Group LLC | HESKA CORP | 576,251 | 7.6% | EDGAR |
| SC 13G | 2019-02-14 | ALGER ASSOCIATES INC | HESKA CORP | 446,569 | 5.9% | EDGAR |
| SC 13G | 2019-02-13 | FMR LLC | HESKA CORP | 444,794 | 5.9% | EDGAR |
| SC 13G/A | 2019-02-12 | VANGUARD GROUP INC | HESKA CORP | 426,531 | 5.6% | EDGAR |
| SC 13G/A | 2019-01-28 | BlackRock Inc. | HESKA CORP | 1,075,438 | 14.2% | EDGAR |
| SC 13G | 2018-02-15 | Neuberger Berman Group LLC | HESKA CORP | 663,484 | 9.2% | EDGAR |
| SC 13G | 2018-02-08 | VANGUARD GROUP INC | HESKA CORP | 434,302 | 6.0% | EDGAR |
| SC 13G/A | 2018-01-23 | BlackRock Inc. | HESKA CORP | 880,414 | 12.2% | EDGAR |
| SC 13G/A | 2017-04-10 | BlackRock Inc. | HESKA CORP | 790,212 | 11.2% | EDGAR |
| SC 13G/A | 2017-01-24 | BlackRock Inc. | HESKA CORP | 435,472 | 6.3% | EDGAR |
| SC 13D | 2016-06-07 | HESKA CORP | HESKA CORP | 542,723 | 7.9% | EDGAR |
| SC 13G | 2016-01-28 | BlackRock Inc. | HESKA CORP | 374,742 | 5.7% | EDGAR |
| SC 13D/A | 2015-07-06 | CMC Master Fund, L.P. | HESKA CORP | 225,000 | - | EDGAR |
| SC 13D/A | 2015-02-10 | CMC Master Fund, L.P. | HESKA CORP | 350,000 | - | EDGAR |
| SC 13G/A | 2014-10-01 | ADAGE CAPITAL PARTNERS GP LLC | HESKA CORP | 314,001 | 5.0% | EDGAR |