Si-Bone, Inc.
A maker of titanium and bone implants for the sacroiliac (SI) joint, where the spine meets the pelvis. Its iFuse line of triangular, 3D-printed titanium implants is used in minimally invasive surgery to fuse that joint and ease lower-back and pelvic pain. Founded in 2008 by orthopedic surgeon Dr. Mark Reiley, who also invented kyphoplasty, the company's name simply nods to its focus: "SI" stands for sacroiliac.
| Holder | Schedule | % of class | Shares | Filed |
|---|---|---|---|---|
| Cadian Capital Management, LP | 13GPassive | 7.5% | 3.35M | Aug 14, 2026 |
| Cadian Capital Management GP, LLC | 13GPassive | 7.5% | 3.35M | Aug 14, 2026 |
| ERIC BANNASCH | 13GPassive | 7.5% | 3.35M | Aug 14, 2026 |
| BlackRock, Inc. | 13G/APassive | 8% | 3.56M | Jul 30, 2026 |
| Mathew P. Arens | 13G/APassive | 18.36% | 8.12M | May 7, 2026 |
| First Light Asset Management, LLC | 13G/APassive | 18.02% | 7.97M | May 7, 2026 |
| The Vanguard Group | 13G/APassive | 0% | 0 | Mar 27, 2026 |
| OrbiMed Capital LLC | 13G/APassive | 0% | 0 | Feb 17, 2026 |
| OrbiMed Advisors LLC | 13G/APassive | 0% | 0 | Feb 17, 2026 |
| BROWN ADVISORY INC | 13G/APassive | 5.79% | 2.51M | Feb 13, 2026 |