Stocks › Biotechnology › SLDB

Solid Biosciences SLDB

US equityMarket cap rank #3471Biotechnology

$6.85 −$0.07 (-1.01%)

Pre-market · Oct 8, 9:10 am ET · After hours $6.85 0.00%

Open$6.76

Prev close$6.92

Day range$6.69 – $6.98

Volume744.7K

Market cap$734.49M

P/E (TTM)–

Dividend yield–

Ownership & positioning

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

Institutional ownership108.5%-2.66 pts vs. prior quarter

Institutions holding185-1 vs. prior quarter

Insider trades (recent)20 buys / 29 sellsNet selling

Short interest15.95% of floatDays to cover 19.6 · as of 15 Sep 2026

Short-sale volume share36.6%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: −$787.4K (10 inflow days, 10 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 45.1% of shares outstanding.

Largest holders

RA Capital Management, L.P.11.23%
Perceptive Advisors LLC11.10%
Bain Capital Life Sciences Investors, LLC9.15%
Artal Group S.A.7.17%
BlackRock6.47%
FMR6.41%
Vanguard Capital Management, LLC4.20%
Armistice Capital LLC3.99%

By investor type

VC/PE Fund42.21%
Mutual Fund38.81%
Hedge Fund24.16%
Public Company2.37%
Individual/Insider0.91%
Private Company0.60%
Insurance Company0.19%
Government Pension Fund0.09%

Reported short interest has fallen from 18.56% to 15.95% 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 Asset Management LLC	Insurance Company	2026/Q3	+204,678	0.2%
RTW Investments, LP	Hedge Fund	2026/Q3	+3,892,926	3.6%
FMR	Mutual Fund	2026/Q3	+3,269,441	6.4%
State Street Global Advisors	Mutual Fund	2026/Q3	+3,049,878	3.9%
RA Capital Management, L.P.	VC/PE Fund	2026/Q3	+2,696,148	11.2%
BlackRock	Mutual Fund	2026/Q3	+1,975,894	6.5%
Vanguard Capital Management, LLC	Mutual Fund	2026/Q3	+1,504,049	4.2%
Franklin Resources	Mutual Fund	2026/Q3	+1,247,771	3.2%
Armistice Capital LLC	Hedge Fund	2026/Q3	+1,078,000	4.0%
Silverarc Capital Management, LLC	Hedge Fund	2026/Q3	+668,450	0.6%
Geode Capital Management, LLC	Mutual Fund	2026/Q3	+644,840	1.8%
The Goldman Sachs Group, Inc.	Public Company	2026/Q3	+541,670	1.3%
Vanguard Portfolio Management, LLC	Mutual Fund	2026/Q3	+409,959	0.7%
Dimensional Fund Advisors	Mutual Fund	2026/Q3	+310,155	1.2%
Moore Capital Management, LP	Hedge Fund	2026/Q3	+278,723	0.6%

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

Insider transactions

Date	Insider	Title	Transaction	Shares	Price	Held after
1 Oct 2026	Ian Smith	Executive Chairperson	Derivative Exercise and Retained	+3,440	–	141,585
1 Jul 2026	Ian Smith	Executive Chairperson	Derivative Exercise and Retained	+3,440	–	138,145
21 Jun 2026	RA Capital Management, L.P.		Initial Statement of Beneficial	+0	–	12,036,126
9 Jun 2026	Ian Smith	Executive Chairperson	Other Derivative Acquisition	+77,500	$6.61	77,500
9 Jun 2026	Perceptive Advisors LLC		Other Derivative Acquisition	+77,500	$6.61	77,500
9 Jun 2026	Martin Freed	Independent Director	Other Derivative Acquisition	+77,500	$6.61	77,500
9 Jun 2026	Sukumar Nagendran	Independent Director	Other Derivative Acquisition	+77,500	$6.61	77,500
9 Jun 2026	Ilan Ganot	Co-founder, Strategic Advisor to the CEO & Director	Other Derivative Acquisition	+77,500	$6.61	77,500
9 Jun 2026	Adam Stone	Lead Independent Director	Other Derivative Acquisition	+77,500	$6.61	77,500
9 Jun 2026	Lynne Sullivan	Independent Director	Other Derivative Acquisition	+77,500	$6.61	77,500
9 Jun 2026	Georgia Keresty	Independent Director	Other Derivative Acquisition	+77,500	$6.61	77,500
9 Jun 2026	G. Kahn	Independent Director	Other Derivative Acquisition	+77,500	$6.61	77,500
1 Apr 2026	Ian Smith	Executive Chairperson	Derivative Exercise and Retained	+3,441	–	134,705
8 Mar 2026	Joseph Edelman		Other Derivative Acquisition	+8,912,655	$0.00	8,912,655
17 Feb 2026	David Howton	COO & Secretary	Intent to Sell (Form 144)	-7,469	$5.82	–
17 Feb 2026	Ilan Ganot	Co-founder, Strategic Advisor to the CEO & Director	Intent to Sell (Form 144)	-2,658	$5.92	–
17 Feb 2026	Alexander Cumbo	Chief Executive Officer	Intent to Sell (Form 144)	-16,644	$5.82	–
17 Feb 2026	Paul Herzich	Chief Technology Officer	Intent to Sell (Form 144)	-3,616	$5.82	–
17 Feb 2026	Kevin Tan	Chief Financial Officer	Intent to Sell (Form 144)	-5,404	$5.82	–
17 Feb 2026	Jessie Hanrahan	Chief Regulatory Officer	Intent to Sell (Form 144)	-4,134	$5.82	–

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	17,106,152	16.0%	19.6
31 Aug 2026	16,384,018	15.3%	18.9
14 Aug 2026	16,619,915	15.5%	19.6
31 Jul 2026	17,036,347	17.3%	16.2
15 Jul 2026	17,667,300	17.9%	11.2
30 Jun 2026	18,268,655	18.6%	4.6

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