Who owns SI-BONE (SIBN)
Which tracked institutional funds hold SIBN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See SIBN company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on SIBN is one-sided between 2026-Q1 and 2026-Q2: 65 added or opened and 20 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
SIBN’s largest tracked holder by dollar value, First Light Asset Management, LLC, sizes it at 8.1% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 8.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in SIBN divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 160 tracked filers holding SIBN, 101 increased or opened the position and 85 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in SIBN between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 3
- BALYASNY ASSET MANAGEMENT L.P.$2M
- JANE STREET GROUP, LLC$1M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$514K
Full exits 12
- Qube Research & Technologies Ltd$5M
- HARBOR CAPITAL ADVISORS, INC.$3M
- ALGERT GLOBAL LLC$3M
- Assenagon Asset Management S.A.$3M
- CITADEL ADVISORS LLC$2M
- Bullseye Asset Management LLC$2M
Largest adds
- First Light Asset Management, LLC$65M
- CADIAN CAPITAL MANAGEMENT, LP$31M
- BlackRock, Inc.$17M
- Granahan Investment Management, LLC$10M
- AMERICAN CENTURY COMPANIES INC$9M
- MARSHALL WACE, LLP$9M
Largest trims
- MORGAN STANLEY$7M
- RENAISSANCE TECHNOLOGIES LLC$5M
- Pier Capital, LLC$2M
- EverSource Wealth Advisors, LLC$893K
- Engineers Gate Manager LP$719K
- GOLDMAN SACHS GROUP INC$649K
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| First Light Asset Management, LLC added | 8,127,985 | $133M | 17.4% | 2026-Q2 |
| BlackRock, Inc. added | 3,676,259 | $60M | 7.9% | 2026-Q2 |
| CADIAN CAPITAL MANAGEMENT, LP added | 3,347,574 | $55M | 7.2% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 2,510,963 | $41M | 5.4% | 2026-Q2 |
| BROWN ADVISORY INC trimmed | 2,077,134 | $34M | 4.4% | 2026-Q2 |
| Granahan Investment Management, LLC added | 1,931,182 | $32M | 4.1% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 1,838,499 | $30M | 3.9% | 2026-Q2 |
| Impax Asset Management Group plc | 1,425,010 | $23M | 3.1% | 2026-Q2 |
| GILDER GAGNON HOWE & CO LLC added | 1,253,042 | $20M | 2.7% | 2026-Q2 |
| PARADIGM CAPITAL MANAGEMENT INC/NY added | 1,233,200 | $20M | 2.6% | 2026-Q2 |
| STATE STREET CORP added | 1,214,286 | $20M | 2.6% | 2026-Q2 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC trimmed | 1,158,576 | $19M | 2.5% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,076,839 | $18M | 2.3% | 2026-Q2 |
| Nuveen, LLC trimmed | 1,026,036 | $17M | 2.2% | 2026-Q2 |
| Champlain Investment Partners, LLC added | 896,462 | $15M | 1.9% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 790,323 | $13M | 1.7% | 2026-Q2 |
| First Eagle Investment Management, LLC added | 768,941 | $13M | 1.6% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 742,857 | $12M | 1.6% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 708,319 | $12M | 1.5% | 2026-Q2 |
| MARSHALL WACE, LLP added | 690,288 | $11M | 1.5% | 2026-Q2 |
| NEXT CENTURY GROWTH INVESTORS LLC added | 585,289 | $10M | 1.3% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 548,287 | $9M | 1.2% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 441,912 | $7M | 0.9% | 2026-Q2 |
| NORTHERN TRUST CORP added | 439,161 | $7M | 0.9% | 2026-Q2 |
| HighMark Wealth Management LLC added | 425,049 | $7M | 0.9% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 421,528 | $7M | 0.9% | 2026-Q2 |
| PEREGRINE CAPITAL MANAGEMENT LLC trimmed | 407,363 | $7M | 0.9% | 2026-Q2 |
| ROYCE & ASSOCIATES LP added | 395,088 | $6M | 0.8% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 364,286 | $6M | 0.8% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 342,784 | $6M | 0.7% | 2026-Q2 |
| Parkman Healthcare Partners LLC trimmed | 328,686 | $5M | 0.7% | 2026-Q2 |
| TOCQUEVILLE ASSET MANAGEMENT L.P. | 304,000 | $5M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 288,877 | $5M | 0.6% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 274,747 | $4M | 0.6% | 2026-Q2 |
| ESSEX INVESTMENT MANAGEMENT CO LLC added | 271,404 | $4M | 0.6% | 2026-Q2 |
| Pier Capital, LLC trimmed | 263,781 | $4M | 0.6% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 253,848 | $4M | 0.5% | 2026-Q2 |
| VELA Investment Management, LLC added | 201,094 | $3M | 0.4% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 185,868 | $3M | 0.4% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 145,170 | $2M | 0.3% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 133,141 | $2M | 0.3% | 2026-Q2 |
| UBS Group AG added | 131,779 | $2M | 0.3% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL added | 131,414 | $2M | 0.3% | 2026-Q2 |
| MORGAN STANLEY trimmed | 130,913 | $2M | 0.3% | 2026-Q2 |
| Cinctive Capital Management LP added | 123,517 | $2M | 0.3% | 2026-Q2 |
| Russell Investments Group, Ltd. trimmed | 121,716 | $2M | 0.3% | 2026-Q2 |
| Bank of New York Mellon Corp added | 120,569 | $2M | 0.3% | 2026-Q2 |
| Squarepoint Ops LLC added | 118,128 | $2M | 0.3% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 100,364 | $2M | 0.2% | 2026-Q2 |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P added | 100,000 | $2M | 0.2% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 95,731 | $2M | 0.2% | 2026-Q2 |
| Legato Capital Management LLC added | 91,361 | $1M | 0.2% | 2026-Q2 |
| CITIGROUP INC added | 90,304 | $1M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 84,200 | $1M | 0.2% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 76,544 | $1M | 0.2% | 2026-Q2 |
| Caption Management, LLC | 75,000 | $1M | 0.2% | 2026-Q2 |
| Trexquant Investment LP trimmed | 70,764 | $1M | 0.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 66,255 | $1M | 0.1% | 2026-Q2 |
| JANE STREET GROUP, LLC trimmed | 64,793 | $1M | 0.1% | 2026-Q2 |
| Palumbo Wealth Management LLC added | 63,166 | $1M | 0.1% | 2026-Q2 |
| Invesco Ltd. added | 62,236 | $1M | 0.1% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 59,736 | $975K | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 53,874 | $879K | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 53,645 | $875K | 0.1% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH trimmed | 53,074 | $866K | 0.1% | 2026-Q2 |
| ADAR1 Capital Management, LLC added | 45,000 | $734K | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 44,945 | $734K | 0.1% | 2026-Q2 |
| Sterling Capital Management LLC trimmed | 44,895 | $733K | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 44,543 | $727K | 0.1% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 44,100 | $720K | 0.1% | 2026-Q2 |
| MERCER GLOBAL ADVISORS INC /ADV added | 42,068 | $687K | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 40,739 | $665K | 0.1% | 2026-Q2 |
| XTX Topco Ltd trimmed | 40,132 | $655K | 0.1% | 2026-Q2 |
| Corient Private Wealth LP added | 38,344 | $626K | 0.1% | 2026-Q2 |
| Hilton Head Capital Partners, LLC | 38,019 | $620K | 0.1% | 2026-Q2 |
| D.A. DAVIDSON & CO. trimmed | 36,776 | $600K | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 36,350 | $459K | 0.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 34,189 | $558K | 0.1% | 2026-Q2 |
| Perpetual Ltd added | 33,886 | $553K | 0.1% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 32,851 | $536K | 0.1% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP new | 31,515 | $514K | 0.1% | 2026-Q2 |
| OP Asset Management Ltd | 30,982 | $506K | 0.1% | 2026-Q2 |
| Penn Capital Management Company, LLC trimmed | 30,290 | $494K | 0.1% | 2026-Q2 |
| Engineers Gate Manager LP trimmed | 29,380 | $479K | 0.1% | 2026-Q2 |
| Magnetar Financial LLC added | 27,740 | $453K | 0.1% | 2026-Q2 |
| DIVERSIFIED TRUST CO added | 27,610 | $451K | 0.1% | 2026-Q2 |
| ALLSTATE CORP new | 27,526 | $449K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 25,814 | $421K | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd | 25,650 | $419K | 0.1% | 2026-Q2 |
| Legal & General Group Plc trimmed | 24,276 | $396K | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 20,253 | $331K | 0.0% | 2026-Q2 |
| EntryPoint Capital, LLC added | 20,237 | $330K | 0.0% | 2026-Q2 |
| BARCLAYS PLC trimmed | 20,134 | $329K | 0.0% | 2026-Q2 |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 20,042 | $327K | 0.0% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 18,414 | $301K | 0.0% | 2026-Q2 |
| LVW Advisors, LLC added | 18,302 | $299K | 0.0% | 2026-Q2 |
| Jain Global LLC new | 17,131 | $280K | 0.0% | 2026-Q2 |
| Creative Planning new | 16,916 | $276K | 0.0% | 2026-Q2 |
| ELEVATION POINT WEALTH PARTNERS, LLC added | 16,389 | $267K | 0.0% | 2026-Q2 |
| Cerity Partners LLC new | 16,243 | $265K | 0.0% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.