$SLDB

$6.19 +$0.38 (6.54%) Close

$SLDB Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 107.2M shares outstanding

Who owns SLDB?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 102.6%

Joseph Edelman 11.2% · Ra Capital Management, L.P. 11.2%

Institutional ownership

100.0%

+7.0 pts vs last qtr

Institutional holders

153

+3 vs last qtr

Net shares bought

+14.5M

by institutions in Q2 2026

New / sold out

34 / 31

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Jupiter Topco LLC NEW +4.0M
RTW Investments, LP NEW +3.9M

Biggest sellers in Q2 2026

Janus Henderson Group PLC SOLD OUT −4.0M
Vestal Point Capital, LP −2.8M

Who is planning to sell?

Notices of proposed sale, last 12 months

$2.61M

22 notices from 7 people

Shares covered

413.7K

0.39% of the company

Arranged in advance

100%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Cumbo Alexander Officer 10b5-1 $984K
Howton David T Officer 10b5-1 $408K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2020–FY2025

+2427.2%

+90.78% a year

Each share's claim on the business

−96.0%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $67.6M

over 6 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years49% 3–5 years2% 1–3 years32% Under 1 year17%

Quarterly turnover

21.7%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting SLDB on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
RC Ra Capital Management, L.P. 13D · 11.9%	12.0M	11.23%	+2.7M (+28.9%)	≤2021	1.0%
Shares held by quarter Peak holding12.0M (Q2'26) Change over 8 quarters+7.7M Share of the company11.230% Disclosed stake13D · 11.9% Ra Capital Management, L.P.'s full portfolio →
PA Perceptive Advisors LLC 13D · 11.2%	11.9M	11.10%	Unchanged	≤2021	1.8%
Shares held by quarter Peak holding11.9M (Q1'25) Change over 8 quarters+5.0M Share of the company11.100% Disclosed stake13D · 11.2% Perceptive Advisors LLC's full portfolio →

Ra Capital Management, L.P.

13D · 11.9%

12.0M

% of company

11.23%

Change vs last qtr

+2.7M (+28.9%)

Held since

≤2021

Perceptive Advisors LLC

13D · 11.2%

11.9M

% of company

11.10%

Change vs last qtr

Unchanged

Held since

≤2021

28 more super investors behind a free account

See every manager holding Solid Biosciences Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting SLDB on Form N-PORT; together they hold 22.9% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$31.5M	3.1M	2.94%	0.00%	June 30, 2026
SS State Street(R) SPDR(R) S&P(R) Biotech ETF SPDR Series Trust	$25.8M	2.6M	2.41%	0.24%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$31.5M

% of company

2.94%

% of the fund

0.00%

As of

June 30, 2026

State Street(R) SPDR(R) S&P(R) Biotech ETF

SPDR Series Trust

Position value

$25.8M

% of company

2.41%

% of the fund

0.24%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Solid Biosciences Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
JE Joseph Edelman 5%+ holder 13D · 11.2%	12.0M	11.23%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company11.230% Disclosed stake13D · 11.2% View the 13D/G filing →
PK Peter Kolchinsky 5%+ holder 13D · 11.9%	12.0M	11.23%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company11.230% Disclosed stake13D · 11.9% View the 13D/G filing →

Joseph Edelman

5%+ holder13D · 11.2%

12.0M

% of company

11.23%

Change vs last qtr

—

Held since

—

Peter Kolchinsky

5%+ holder13D · 11.9%

12.0M

% of company

11.23%

Change vs last qtr

—

Held since

—

18 more holders behind a free account

See every insider and 5%+ holder of Solid Biosciences Inc.

Comments