| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G/A | 2019-12-23 | AQR CAPITAL MANAGEMENT LLC | NxStage Medical, Inc. | 0 | 0.0% | EDGAR |
| SC 13G | 2019-02-14 | TIG Advisors, LLC | NxStage Medical, Inc. | 3,926,141 | 5.9% | EDGAR |
| SC 13G | 2019-02-14 | AQR CAPITAL MANAGEMENT LLC | NxStage Medical, Inc. | 3,750,157 | 5.6% | EDGAR |
| SC 13G/A | 2019-02-11 | VANGUARD GROUP INC | NxStage Medical, Inc. | 6,148,544 | 9.2% | EDGAR |
| SC 13G/A | 2019-02-06 | BlackRock Inc. | NxStage Medical, Inc. | 5,424,200 | 8.1% | EDGAR |
| SC 13G/A | 2018-02-14 | Flynn James E | NxStage Medical, Inc. | 0 | 0.0% | EDGAR |
| SC 13G/A | 2018-02-09 | VANGUARD GROUP INC | NxStage Medical, Inc. | 5,486,858 | 8.3% | EDGAR |
| SC 13G/A | 2018-02-09 | ALPINE ASSOCIATES MANAGEMENT INC. | NxStage Medical, Inc. | 3,285,826 | 5.0% | EDGAR |
| SC 13G | 2018-02-08 | ALPINE ASSOCIATES MANAGEMENT INC. | NxStage Medical, Inc. | 4,035,237 | 6.1% | EDGAR |
| SC 13G/A | 2018-01-29 | BlackRock Inc. | NxStage Medical, Inc. | 4,397,090 | 6.6% | EDGAR |
| SC 13G/A | 2017-09-11 | FMR LLC | NxStage Medical, Inc. | 1,291,485 | 2.0% | EDGAR |
| SC 13G/A | 2017-08-11 | GILDER GAGNON HOWE & CO LLC | NxStage Medical, Inc. | 2,173,964 | 3.3% | EDGAR |
| SC 13G/A | 2017-02-14 | FMR LLC | NxStage Medical, Inc. | 7,344,802 | 11.3% | EDGAR |
| SC 13G/A | 2017-02-14 | GILDER GAGNON HOWE & CO LLC | NxStage Medical, Inc. | 5,749,761 | 8.9% | EDGAR |
| SC 13G/A | 2017-02-14 | Flynn James E | NxStage Medical, Inc. | 4,258,196 | 6.6% | EDGAR |
| SC 13G/A | 2017-02-10 | VANGUARD GROUP INC | NxStage Medical, Inc. | 4,861,529 | 7.5% | EDGAR |
| SC 13G/A | 2017-02-06 | FEINBERG LARRY N | NxStage Medical, Inc. | 2,721,626 | 4.2% | EDGAR |
| SC 13G/A | 2017-01-25 | BlackRock Inc. | NxStage Medical, Inc. | 4,337,294 | 6.7% | EDGAR |
| SC 13G/A | 2016-11-03 | RS INVESTMENT MANAGEMENT CO LLC | NxStage Medical, Inc. | 0 | 0.0% | EDGAR |
| SC 13G/A | 2016-07-11 | FMR LLC | NxStage Medical, Inc. | 7,537,811 | 11.7% | EDGAR |