As of November 6, 2026, 5 holders' latest Schedule 13D or 13G filings report owning 5% or more of SI-BONE, Inc. The largest reported stake is Mathew P. Arens', at 18.36%. 13 filings are on record since August 12, 2025 (Schedule 13G/A, May 7, 2026).
Sell to companies like SI-BONE, Inc? Enter your website and see 10 with a filed reason to buy from you this month. Free.
Opens in a new tab. No signup.
Key facts
- · Reporting person: Cadian Capital Management, LP · Sole voting: 0 · Shared voting: 3,347,574 · Sole dispositive: 0 · Shared dispositive: 3,347,574 · SCHEDULE 13G, 2026-08-14
- · Reporting person: BlackRock, Inc. · Sole voting: 3,490,613 · Shared voting: 0 · Sole dispositive: 3,558,735 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-07-30
- · Reporting person: First Light Asset Management, LLC · Sole voting: 0 · Shared voting: 7,971,486 · Sole dispositive: 0 · Shared dispositive: 7,971,486 · SCHEDULE 13G/A, 2026-05-07
- · Holder: BlackRock, Inc. · Percent: 6.9% · SCHEDULE 13G/A
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
SI-BONE, Inc. has 13 Schedule 13D or 13G filings on record since 2025-08-12. 5 holders' latest filing reports 5% or more of common stock, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 18.36% | 8,120,986 | SCHEDULE 13G/A, 2026-05-07 | 2026-04-30 | |
| BlackRock, Inc. | 8% | 3,558,735 | SCHEDULE 13G/A, 2026-07-30 | 2026-06-30 |
| Cadian Capital Management, LP | 7.5% | 3,347,574 | SCHEDULE 13G, 2026-08-14 | 2026-06-30 |
| Brown Advisory Inc | 5.79% | 2,513,268 | SCHEDULE 13G/A, 2026-02-13 | 2025-12-31 |
| American Century Investment Management, Inc. | 5.3% | 2,300,508 | SCHEDULE 13G/A, 2026-02-13 | 2025-12-31 |
| Champlain Investment Partners, LLC | 4.9% | 2,108,944 | SCHEDULE 13G, 2026-02-12 | 2025-09-30 |
| OrbiMed Capital LLC | 0% | 0 | SCHEDULE 13G/A, 2026-02-17 | 2025-12-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
Holding shares or following this stake? See who's behind SI-BONE, Inc. and the warning signs.
Free to see. No signup.
Keep reading
More on SI-BONE, Inc. and the records around it.
SI-BONE, Inc. elsewhere on the record
Companies that share a holder
- Champlain Investment Partners, LLC also filed stake reports on 6 other companies: Baldwin Insurance Group, Inc. (Feb 2026), Freshpet, Inc. (Feb 2026), OneStream, Inc. (Feb 2026)
- Cadian Capital Management, LP also filed stake reports on 7 other companies: Cryoport, Inc. (Aug 2026), Flywire Corp. (Aug 2026), TACTILE SYSTEMS TECHNOLOGY INC (Aug 2026)
- BROWN ADVISORY INC also filed stake reports on 11 other companies: Andersen Group Inc. (Oct 2026), Lumexa Imaging Holdings, Inc. (Aug 2026), Nomad Foods Ltd (Aug 2026)
Watch SI-BONE, Inc.
Get an email when SI-BONE, Inc. files again: a new raise, a leadership change, a layoff or an IPO filing. One email first to confirm; nothing else until you click it. At most one a day, one click to stop. Free for up to 3 companies.
Want the whole picture on SI-BONE, Inc.?
Example from a real report (our sample on Target): “In March 2026, Target announced a planned incremental $1 billion operating investment” Source: Target Corporation (press release)
A Full Report on SI-BONE, Inc.: verified, sourced, every claim cited, ready in a few minutes. See pricing.
What the Full Report on SI-BONE, Inc. covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
13 cited sources found
Plus the sections for what you are deciding, which you pick after ordering.
A real finished report, first screen. Opens in a new tab.
Not ready to order yet? Keep this snapshot.
Sends this preview to you once; we won't add you to any list
Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| First Light Asset Management, LLC | 0 | 7,971,486 | 0 | 7,971,486 | SCHEDULE 13G/A, 2026-05-07 |
| Mathew P. Arens | 23,000 | 8,097,986 | 23,000 | 8,097,986 | SCHEDULE 13G/A, 2026-05-07 |
| BlackRock, Inc. | 3,490,613 | 0 | 3,558,735 | 0 | SCHEDULE 13G/A, 2026-07-30 |
| Cadian Capital Management, LP | 0 | 3,347,574 | 0 | 3,347,574 | SCHEDULE 13G, 2026-08-14 |
| Cadian Capital Management GP, LLC | 0 | 3,347,574 | 0 | 3,347,574 | SCHEDULE 13G, 2026-08-14 |
| Eric Bannasch | 0 | 3,347,574 | 0 | 3,347,574 | SCHEDULE 13G, 2026-08-14 |
The latest filing identifies SI-BONE, Inc. by CUSIP 825704109 and gives its principal executive office as 471 El Camino Real, Suite 101, Santa Clara, CA 95050 (SCHEDULE 13G, 2026-08-14).
What the percentages are based on
As of June 30, 2026, each of the Reporting Persons may have been deemed to have beneficially owned approximately 7.5% of the shares of Common Stock of the Issuer outstanding, based on 44,697,215 shares of Common Stock outstanding as of June 30, 2026, as disclosed in the Issuer's Form 10-Q filed with the Securities and Exchange Commission on August 4, 2026.Cadian Capital Management, LP, SCHEDULE 13G, 2026-08-14
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-12 | Champlain Investment Partners, LLC | 5% | SCHEDULE 13G |
| 2025-08-14 | OrbiMed Capital LLC | 5.1% | SCHEDULE 13G/A |
| 2025-11-14 | American Century Investment Management, Inc. | 6.6% | SCHEDULE 13G/A |
| 2025-12-05 | Mathew P. Arens | 11.92% | SCHEDULE 13G |
| 2026-02-12 | Champlain Investment Partners, LLC | 4.9% | SCHEDULE 13G |
| 2026-02-13 | American Century Investment Management, Inc. | 5.3% | SCHEDULE 13G/A |
| 2026-02-13 | Brown Advisory Inc | 5.79% | SCHEDULE 13G/A |
| 2026-02-17 | OrbiMed Capital LLC | 0% | SCHEDULE 13G/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-24 | BlackRock, Inc. | 6.9% | SCHEDULE 13G/A |
| 2026-05-07 | Mathew P. Arens | 18.36% | SCHEDULE 13G/A |
| 2026-07-30 | BlackRock, Inc. | 8% | SCHEDULE 13G/A |
| 2026-08-14 | Cadian Capital Management, LP | 7.5% | SCHEDULE 13G |
Questions about who owns SI-BONE, Inc.
Who owns SI-BONE, Inc.?
On this page, 5 holders' latest ownership filings report 5% or more of SI-BONE, Inc.: Mathew P. Arens (18.36%, Schedule 13G/A, filed 2026-05-07), BlackRock, Inc. (8%, Schedule 13G/A, filed 2026-07-30), Cadian Capital Management, LP (7.5%, Schedule 13G, filed 2026-08-14), Brown Advisory Inc (5.79%, Schedule 13G/A, filed 2026-02-13) and American Century Investment Management, Inc. (5.3%, Schedule 13G/A, filed 2026-02-13).
Who are the largest shareholders of SI-BONE, Inc.?
By the share each holder's latest filing reports, the largest holders of SI-BONE, Inc. on this page are Mathew P. Arens (18.36%), BlackRock, Inc. (8%) and Cadian Capital Management, LP (7.5%).
When did Mathew P. Arens buy into SI-BONE, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Mathew P. Arens on this page is the Schedule 13G, filed 2025-12-05, reporting 11.92%; its latest, Schedule 13G/A filed 2026-05-07, reports 18.36%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 13 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Tools for this story
Each opens in a new tab, filled in for SI-BONE, Inc.. With no account yet, you sign up free and land on the result.
Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.