SI-BONE, Inc.
SI-BONE, Inc. (SIBN) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · SIBN · as of Mar 31, 2025
Ownership Breakdown
160
Institutional Holders
▲ 12 vs Q4
$567.62M
Total Inst. Value
▲ $9.45M vs Q4
44.35M
Shares Outstanding
freeFloat 96.58%
40.46M
13F Shares Held
▲ 641,943 vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
SIBN largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. surgical & medical instruments & apparatus | 3.73M | 8.81% | 8.81% | $52.32B | May 2, 2025 | ▼ 104.8K |
ORBIMED ADVISORS LLC surgical & medical instruments & apparatus | 3.44M | 8.13% | 8.13% | $48.30B | May 15, 2025 | — held |
BROWN ADVISORY INC surgical & medical instruments & apparatus | 3.19M | 7.53% | 7.53% | $44.72B | Apr 30, 2025 | ▼ 453.0K |
AMERICAN CENTURY COMPANIES INC surgical & medical instruments & apparatus | 2.64M | 6.24% | 6.24% | $37.07B | May 13, 2025 | ▲ 264.3K |
CHAMPLAIN INVESTMENT PARTNERS, LLC surgical & medical instruments & apparatus | 2.60M | 6.13% | 6.13% | $36.42B | May 14, 2025 | ▼ 125.1K |
VANGUARD GROUP INC surgical & medical instruments & apparatus | 2.44M | 5.77% | 5.77% | $34.29B | May 9, 2025 | ▲ 35.3K |
SILVERCREST ASSET MANAGEMENT GROUP LLC surgical & medical instruments & apparatus | 1.62M | 3.83% | 3.83% | $22.78B | May 15, 2025 | ▼ 330.2K |
FIRST LIGHT ASSET MANAGEMENT, LLC surgical & medical instruments & apparatus | 1.61M | 3.81% | 3.81% | $22.62B | May 15, 2025 | ▲ 475.4K |
GRANAHAN INVESTMENT MANAGEMENT, LLC surgical & medical instruments & apparatus | 1.43M | 3.38% | 3.38% | $20.10B | May 15, 2025 | ▼ 201.9K |
NUVEEN, LLC surgical & medical instruments & apparatus | 1.33M | 3.13% | 3.13% | $18.61B | May 12, 2025 | NEW |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
24
Increased
+2.16M shares4
New Positions
first time holders17
Decreased
−2.40M shares0
Sold Out
fully exitedNet shares change (top 50)
241.5K
+2.16M / −2.40M
Net new holders
+11
4 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
SIBN insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
1
Buy transactions
16
Sell transactions
0.06
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Davis Timothy E JR director | May 28, 2026 | Sale | 3,780 | $14.47 | $54.7K | 69.2K | Form 4 ↗ |
Davis Timothy E JR director | May 29, 2026 | Sale | 3,500 | $14.14 | $49.5K | 65.7K | Form 4 ↗ |
FRANCIS LAURA Chief Executive Officer | May 18, 2026 | Sale | 3,893 | $14.75 | $57.4K | 540.5K | Form 4 ↗ |
FRANCIS LAURA Chief Executive Officer | May 18, 2026 | Sale | 2,236 | $14.67 | $32.8K | 538.2K | Form 4 ↗ |
FRANCIS LAURA Chief Executive Officer | May 18, 2026 | Sale | 1,973 | $14.57 | $28.7K | 536.3K | Form 4 ↗ |
FRANCIS LAURA Chief Executive Officer | May 18, 2026 | Sale | 3,652 | $14.75 | $53.9K | 532.6K | Form 4 ↗ |
FRANCIS LAURA Chief Executive Officer | May 18, 2026 | Sale | 3,203 | $14.73 | $47.2K | 503.4K | Form 4 ↗ |
PISETSKY MICHAEL A. SVP, Ops & Adm/Chief Legal Ofr | May 18, 2026 | Sale | 1,872 | $14.63 | $27.4K | 281.0K | Form 4 ↗ |
PISETSKY MICHAEL A. SVP, Ops & Adm/Chief Legal Ofr | May 18, 2026 | Sale | 1,854 | $14.64 | $27.1K | 280.5K | Form 4 ↗ |
Maheshwari Anshul Chief Financial Officer | May 18, 2026 | Sale | 2,477 | $14.71 | $36.4K | 260.7K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
SI-BONE, Inc. (SIBN) is primarily owned by institutional investors, who hold approximately 91.2% of total shares outstanding. Company insiders own approximately 3.42%, while retail and public investors account for the remaining 5.35%.
The largest institutional shareholder of SI-BONE, Inc. is BLACKROCK, INC., holding approximately 3.73 million shares — equal to 8.81% of outstanding shares — as of March 31, 2025.
A total of 160 institutional investors currently hold SIBN stock, with a combined institutional value of approximately $567,622,049 as of the most recent 13F filing period.
Frequently asked questions
SIBN ownershipSI-BONE, Inc. (SIBN) is primarily owned by institutional investors, who hold approximately 91.2% of shares. The largest shareholder is BLACKROCK, INC. with a 8.81% stake. Company insiders hold 3.42%. Data sourced from SEC Form 13F as of March 31, 2025.