Stocks › Medical Devices › SIBN

Si-Bone SIBN

US equityMarket cap rank #3350Medical Devices

$19.10 −$0.45 (-2.30%)

Market closed · Oct 8, 4:10 am ET · Last extended-hours $19.10 0.00%

Open$19.27

Prev close$19.55

Day range$18.98 – $19.69

Volume547.6K

Market cap$856.03M

P/E (TTM)–

Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership109.5%-4.35 pts vs. prior quarter

Institutions holding215-3 vs. prior quarter

Insider trades (recent)13 buys / 37 sellsNet selling

Short interest13.20% of floatDays to cover 10.7 · as of 15 Sep 2026

Short-sale volume share28.9%5-day average of daily volume

Short-sale volume as % of daily volume

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$1.18M (7 inflow days, 13 outflow days).

Net flow by order size, last 20 sessions

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 44.2% of shares outstanding.

Largest holders

First Light Asset Management, LLC18.14%
BlackRock8.20%
Cadian Capital Management, LP7.47%
American Century Investment Management5.60%
Vanguard Capital Management, LLC4.75%
Brown Advisory Incorporated4.63%
Granahan Investment Management, LLC4.31%
Impax Asset Management Group Plc3.18%

By investor type

Mutual Fund90.82%
Hedge Fund15.64%
Individual/Insider3.31%
Public Company1.66%
Private Company0.76%
Insurance Company0.25%
Government Pension Fund0.21%
Family Office/Trust0.14%

Reported short interest has fallen from 13.48% to 13.20% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Recent institutional activity

Holder	Type	Period	Share change	New stake
Nuveen Fund Advisors, LLC	Mutual Fund	2026/Q3	+66,801	0.9%
Nuveen Asset Management LLC	Insurance Company	2026/Q3	+82,245	0.2%
First Light Asset Management, LLC	Mutual Fund	2026/Q3	+2,774,795	18.1%
Cadian Capital Management, LP	Hedge Fund	2026/Q3	+1,460,102	7.5%
Marshall Wace LLP	Hedge Fund	2026/Q3	+522,160	1.5%
Highmark Wealth Management LLC	Mutual Fund	2026/Q3	+265,217	0.9%
BlackRock	Mutual Fund	2026/Q3	+247,718	8.2%
Gilder Gagnon Howe & Co. LLC	Mutual Fund	2026/Q3	+204,526	2.8%
Next Century Growth Investors LLC	Mutual Fund	2026/Q3	+201,331	1.3%
Granahan Investment Management, LLC	Mutual Fund	2026/Q3	+192,085	4.3%
AQR Capital Management	Hedge Fund	2026/Q3	+190,036	0.6%
Vanguard Portfolio Management, LLC	Mutual Fund	2026/Q3	+134,793	1.2%
First Eagle Investment Management, LLC	Mutual Fund	2026/Q3	+130,000	1.7%
Geode Capital Management, LLC	Mutual Fund	2026/Q3	+125,111	2.4%
Paradigm Capital Management, Inc.	Mutual Fund	2026/Q3	+106,700	2.8%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

Date	Insider	Title	Transaction	Shares	Price	Held after
4 Oct 2026	Anshul Maheshwari	Chief Financial Officer	Intent to Sell (Form 144)	-1,731	$18.08	–
30 Sep 2026	Jeffrey Dunn	Executive Chairperson	Derivative Exercise and Sale	-20,000	$18.47	86,173
31 Aug 2026	Jeffrey Dunn	Executive Chairperson	Derivative Exercise and Sale	-20,000	$18.91	86,173
23 Aug 2026	Laura Francis	Chief Executive Officer	Automatic Disposition	-25,972	$20.12	429,694
23 Aug 2026	Anshul Maheshwari	Chief Financial Officer	Automatic Disposition	-11,636	$20.11	55,680
20 Aug 2026	Anshul Maheshwari	Chief Financial Officer	Intent to Sell (Form 144)	-11,228	$19.48	–
20 Aug 2026	Laura Francis	Chief Executive Officer	Automatic Disposition	-55,807	$20.02	455,666
20 Aug 2026	Anshul Maheshwari	Chief Financial Officer	Automatic Disposition	-16,975	$20.02	67,316
18 Aug 2026	Anshul Maheshwari	Chief Financial Officer	Intent to Sell (Form 144)	-5,747	$19.14	–
16 Aug 2026	Laura Francis	Chief Executive Officer	Open Market Disposition	-14,956	$18.68	511,473
16 Aug 2026	Anshul Maheshwari	Chief Financial Officer	Open Market Disposition	-4,665	$18.68	84,291
16 Aug 2026	Michael Pisetsky	Chief Business & Legal Affairs Officer	Open Market Disposition	-3,725	$18.65	143,369
2 Aug 2026	Jeffrey Dunn	Executive Chairperson	Derivative Exercise and Sale	-20,000	$18.46	86,173
1 Jul 2026	Anshul Maheshwari	Chief Financial Officer	Open Market Disposition	-3,317	$16.80	79,419
1 Jul 2026	Michael Pisetsky	Chief Business & Legal Affairs Officer	Open Market Disposition	-3,134	$16.86	139,788
4 Jun 2026	Jeffrey Dunn	Executive Chairperson	Open Market Disposition	-3,575	$15.25	86,173
3 Jun 2026	Timothy Davis	Lead Independent Director	Other Acquisition	+10,957	–	10,957
3 Jun 2026	Jeryl Hilleman	Independent Director	Other Acquisition	+10,957	–	10,957
3 Jun 2026	John Freund	Independent Director	Other Acquisition	+10,957	–	10,957
3 Jun 2026	Jeffrey Dunn	Executive Chairperson	Other Acquisition	+10,957	–	10,957

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report date	Shares short	% of float	Days to cover
15 Sep 2026	5,914,143	13.2%	10.7
31 Aug 2026	5,626,900	12.6%	9.9
14 Aug 2026	5,336,842	11.9%	10.9
31 Jul 2026	5,080,650	11.5%	10.9
15 Jul 2026	5,507,086	12.4%	8.9
30 Jun 2026	5,978,449	13.5%	8.5

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