SI-BONE Inc
SIBN
180 hedge funds and large institutions have $548M invested in SI-BONE Inc in 2026 Q1 according to their latest regulatory filings, with 33 funds opening new positions, 63 increasing their positions, 68 reducing their positions, and 32 closing their positions.
26% more call options, than puts
Call options by funds: $3.02M | Put options by funds: $2.4M
3.03% more ownership
Funds ownership: 95.21% → 98.24% (+3%)
3% more first-time investments, than exits
New positions opened: 33 | Existing positions closed: 32
0% more funds holding in top 10
Funds holding in top 10: 1 → 1 (0)
7% less repeat investments, than reductions
Existing positions increased: 63 | Existing positions reduced: 68
1% less funds holding
Funds holding: 182 → 180 (-2)
33% less capital invested
Capital invested by funds: $815M → $548M (-$266M)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
GIM
Granahan Investment Management
Waltham,
Massachusetts
|
+$13.4M |
| 2 |
CCM
Cadian Capital Management
New York
|
+$11.2M |
| 3 |
GGHC
Gilder Gagnon Howe & Co
New York
|
+$9.93M |
| 4 |
PCMI
Paradigm Capital Management Inc
Albany,
New York
|
+$9.36M |
| 5 |
Morgan Stanley
New York
|
+$7.94M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AG
Algert Global
San Francisco,
California
|
-$5.97M |
| 2 |
Brown Advisory
Baltimore,
Maryland
|
-$5.31M |
| 3 |
Jane Street
New York
|
-$4.8M |
| 4 |
Walleye Capital
New York
|
-$3.83M |
| 5 |
CIP
Champlain Investment Partners
Burlington,
Vermont
|
-$3.73M |
SIBN Hedge Fund Activity: Q1 2026 in Review
180 of the 8,126 institutional investors tracked by Wall St. Rank reported a position in SI-BONE Inc (SIBN) for Q1 2026, worth a combined $548M — down 33% from $815M a quarter earlier.
Buyers outnumbered sellers: 33 funds opened new SIBN positions and 32 closed out — a net gain of 1 holder — while 63 added to existing stakes and 68 trimmed.
The largest buyer was Granahan Investment Management, adding an estimated $13.4M. The largest seller was Algert Global, cutting an estimated $5.97M.
- 180 institutional investors held SI-BONE Inc (SIBN) as of Q1 2026, down from 182 in Q4 2025.
- Funds reported $548M of SI-BONE Inc stock for Q1 2026, down 33% quarter-over-quarter.
- 33 funds opened new SI-BONE Inc positions in Q1 2026 and 32 closed out, a net change of +1 holder.
- The largest SI-BONE Inc buyer in Q1 2026 was Granahan Investment Management, an estimated $13.4M added.
- The largest SI-BONE Inc seller in Q1 2026 was Algert Global, an estimated $5.97M sold.
Based on aggregated 13F filings for Q1 2026.