$PTCT

$62.09 +$1.02 (1.67%) Close

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

Ownership

13F as of Q2 2026 · 83.5M shares outstanding

Who owns PTCT?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 107.3%

BlackRock, Inc. 29.3% · State Street Corp 11.9%

Institutional ownership

100.0%

0 pts vs last qtr

Institutional holders

444

+16 vs last qtr

Net shares bought

+6.7M

by institutions in Q2 2026

New / sold out

72 / 56

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Jupiter Topco LLC NEW +7.3M
Westfield Capital Management Co LP NEW +2.0M

Biggest sellers in Q2 2026

Janus Henderson Group PLC SOLD OUT −7.2M
Prosight Management, LP −1.3M

Who is planning to sell?

Notices of proposed sale, last 12 months

$57.2M

88 notices from 15 people

Shares covered

747.1K

0.90% of the company

Arranged in advance

87%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Almstead Neil Gregory Officer $22.1M
Pauwels Eric Officer $7.48M

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, FY2012–FY2025

+513189.7%

+158.38% a year

Each share's claim on the business

−100.0%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $607M

over 10 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+ years65% 3–5 years7% 1–3 years13% Under 1 year15%

Quarterly turnover

15.7%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting PTCT on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	24.5M	29.32%	+1.9M (+8.4%)	≤2021	0.0%
Shares held by quarter Peak holding24.5M (Q2'26) Change over 8 quarters+9.3M Share of the company29.320% BlackRock, Inc.'s full portfolio →
SS State Street Corp	9.9M	11.90%	+1.1M (+12.1%)	≤2021	0.0%
Shares held by quarter Peak holding9.9M (Q2'26) Change over 8 quarters+4.4M Share of the company11.900% State Street Corp's full portfolio →

BlackRock, Inc.

24.5M

% of company

29.32%

Change vs last qtr

+1.9M (+8.4%)

Held since

≤2021

State Street Corp

9.9M

% of company

11.90%

Change vs last qtr

+1.1M (+12.1%)

Held since

≤2021

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting PTCT on Form N-PORT; together they hold 76.2% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Small-Cap ETF iShares Trust	$408M	5.0M	5.99%	0.37%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$246M	5.4M	6.51%	0.01%	June 30, 2026

iShares Core S&P Small-Cap ETF

iShares Trust

Position value

$408M

% of company

5.99%

% of the fund

0.37%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$246M

% of company

6.51%

% of the fund

0.01%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding PTC Therapeutics, 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
SM Schmertzler Michael Insider	2.8M	3.30%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company3.300% Schmertzler Michael's insider activity →
GP Gravier Pierre Insider	839.9K	1.01%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.010% Gravier Pierre's insider activity →

Schmertzler Michael

Insider

2.8M

% of company

3.30%

Change vs last qtr

—

Held since

—

Gravier Pierre

Insider

839.9K

% of company

1.01%

Change vs last qtr

—

Held since

—

16 more holders behind a free account

See every insider and 5%+ holder of PTC Therapeutics, Inc..

Comments