| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G | 2020-01-13 | MANGROVE PARTNERS | Sierra Oncology, Inc. | 7,894,526 | 10.0% | EDGAR |
| SC 13D | 2019-11-27 | ORBIMED ADVISORS LLC | Sierra Oncology, Inc. | 18,660,402 | 20.0% | EDGAR |
| SC 13D | 2019-11-25 | Longitude Capital Partners III, LLC | Sierra Oncology, Inc. | 18,660,402 | 20.0% | EDGAR |
| SC 13G | 2019-11-25 | Venrock Healthcare Capital Partners II, L.P. | Sierra Oncology, Inc. | 8,289,478 | 10.0% | EDGAR |
| SC 13G | 2019-11-25 | Vivo Opportunity, LLC | Sierra Oncology, Inc. | 12,989,610 | 3.4% | EDGAR |
| SC 13G/A | 2019-02-14 | PERCEPTIVE ADVISORS LLC | Sierra Oncology, Inc. | 2,666,190 | 3.6% | EDGAR |
| SC 13G/A | 2019-02-13 | Broadfin Capital, LLC | Sierra Oncology, Inc. | 4,880,327 | 6.6% | EDGAR |
| SC 13G/A | 2019-02-13 | ORBIMED ADVISORS LLC | Sierra Oncology, Inc. | 417,104 | 0.6% | EDGAR |
| SC 13G/A | 2019-02-13 | New Leaf Biopharma Opportunities I, L.P. | Sierra Oncology, Inc. | 5,020,446 | 6.8% | EDGAR |
| SC 13D/A | 2018-11-14 | Frazier Life Sciences VIII, L.P. | Sierra Oncology, Inc. | 5,925,926 | 8.0% | EDGAR |
| SC 13G | 2018-09-07 | Broadfin Capital, LLC | Sierra Oncology, Inc. | 4,090,344 | 5.5% | EDGAR |
| SC 13G/A | 2018-02-14 | PERCEPTIVE ADVISORS LLC | Sierra Oncology, Inc. | 5,000,000 | 9.6% | EDGAR |
| SC 13G/A | 2018-02-14 | Flynn James E | Sierra Oncology, Inc. | 1,761,092 | 3.4% | EDGAR |
| SC 13G | 2018-02-14 | New Leaf Biopharma Opportunities I, L.P. | Sierra Oncology, Inc. | 2,798,224 | 5.4% | EDGAR |
| SC 13G | 2018-02-13 | ORBIMED ADVISORS LLC | Sierra Oncology, Inc. | 3,203,704 | 6.1% | EDGAR |
| SC 13G | 2017-11-27 | PERCEPTIVE ADVISORS LLC | Sierra Oncology, Inc. | 3,655,186 | 7.0% | EDGAR |
| SC 13D | 2017-02-24 | Frazier Healthcare VI, L.P. | Sierra Oncology, Inc. | 8,112,121 | 16.3% | EDGAR |
| SC 13G/A | 2017-02-14 | Flynn James E | Sierra Oncology, Inc. | 4,972,319 | 10.0% | EDGAR |
| SC 13G/A | 2017-02-13 | ORBIMED ADVISORS LLC | Sierra Oncology, Inc. | 0 | 0.0% | EDGAR |
| SC 13G/A | 2016-07-11 | FMR LLC | ProNAi Therapeutics Inc | 197,100 | 0.7% | EDGAR |