Ptc Therapeutics PTCT Insider Ownership

NASDAQ PTCT

$62.62 -0.30 (-0.48%)

At close: Oct 21, 2026 · 4:00 PM EDT

The most recent Ptc Therapeutics (PTCT) insider transaction: Michael Schmertzler (Director) sold 2,118 shares worth about $126.06K on Oct 14, 2026, reported on Form 4 on Oct 16, 2026. So far in the quarter ending Dec 31, 2026, insiders were net sellers of 5.00K shares.

Updated Oct 16, 2026 Ptc Therapeutics (PTCT) stock price and overview

Insider Holdings by Owner

2.66Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

3.03%

▲+1.60% pp QoQ

Shares Held by Insiders

2.53Mn

filed for Sep 2026

▲+112.11% QoQ

Shares Outstanding

83.33Mn

83,327,286 shares

Direct Holdings

1.23Mn

Indirect: 1.30Mn

Net Shares Traded (QoQ)

+1.34Mn

net buying in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 16, 2026

Over the past year, PTCT insiders sold $57.71 million of stock (755.2K shares) on the open market and bought none.

Counted by insider, open-market selling of PTCT stock in the past 12 months came from 13 insiders, with no insider buying.
The largest open-market sales of PTCT in the past 12 months were by Neil Gregory Almstead (Chief Technical Operations Officer), totaling $22.36 million (277.36K shares), most recently on July 9, 2026.
Mark Elliott Boulding (Executive VP and CLO) made the most recent open-market trade by an insider of PTC Therapeutics, a sale of 192 shares for $12,338 on October 9, 2026.
In transactions other than open-market trades, PTC Therapeutics insiders received 215.98K shares in stock awards, acquired 492.52K shares through option exercises and conversions and gave away 867 shares as gifts over the past 12 months.
Per Business Quant, PTCT insiders together hold 2.53Mn shares based on their latest Form 4 filings, or 3.03% of the 83.33Mn shares outstanding.
PTC Therapeutics insiders hold 1.23Mn shares directly (48.64% of their total) and 1.3Mn shares (51.36%) indirectly, through entities such as trusts and partnerships.
PTCT's insider total is spread across 18 insiders who have filed a Form 4 in the past two years.
PTC Therapeutics' top three insider holders by shares held are Michael Schmertzler (Director, 1.46Mn shares), Matthew B. Klein (Chief Executive Officer, 383.87K shares) and Mark Elliott Boulding (Executive VP and CLO, 105.27K shares).
Of the shares held by PTCT insiders, 57.71% belong to Michael Schmertzler.
Over the trailing 12 months, 18 insiders reported transactions in PTCT stock across 86 Form 4 filings.
The insider holdings and trades above for PTC Therapeutics reflect Form 4 filings through October 13, 2026.

Form 4 Holdings

Insiders Holding PTCT

Insiders 22

Shares held 2.66Mn

Of outstanding 3.19%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Michael Schmertzler	Director	0	1,291,594	1,291,594	48.6%	16 Oct, 2026
2	Matthew B. Klein	Chief Executive Officer	383,868	0	383,868	14.4%	06 Aug, 2026
3	Stuart Walter Peltz	Chief Executive Officer	166,962	54,903	221,865	8.4%	02 Feb, 2023
4	Mark Elliott Boulding	Exec. Vp And Clo	105,272	0	105,272	4.0%	13 Oct, 2026
5	Pierre Gravier	Chief Financial Officer	83,986	0	83,986	3.2%	16 Jul, 2026
6	Lee Scott Golden	Evp Chief Medical Officer	79,115	0	79,115	3.0%	06 Apr, 2026
7	Eric Pauwels	Chief Business Officer	73,411	0	73,411	2.8%	12 Jun, 2026
8	Christine Marie Utter	Svp, Chief Accounting Officer	70,199	0	70,199	2.6%	22 Jun, 2026
9	Neil Gregory Almstead	Chief Technical Ops Officer	60,299	0	60,299	2.3%	13 Jul, 2026
10	Hege Elisabeth Sollie-Zetlmayer	Director	52,526	0	52,526	2.0%	30 Jul, 2026
11	Emily Luisa Hill	Chief Financial Officer	38,925	0	38,925	1.5%	29 Mar, 2023
12	Dawn Svoronos	Director	29,017	0	29,017	1.1%	10 Jun, 2022
13	Glenn Jr Md Phd Steele	Director	22,500	0	22,500	0.8%	02 Oct, 2026
14	Jerome B Zeldis	Director	22,500	0	22,500	0.8%	06 Jan, 2026
15	Mary L. Smith	Director	21,813	0	21,813	0.8%	13 Jul, 2026
16	Allan Steven Jacobson	Director	21,451	0	21,451	0.8%	06 Jan, 2026
17	Alethia Young	Director	21,067	0	21,067	0.8%	06 Jan, 2026
18	David P Southwell	Director	20,850	0	20,850	0.8%	06 Jan, 2026
19	Emma Reeve	Director	10,666	0	10,666	0.4%	06 Jan, 2026
20	William F. Jr. Bell	Director	10,333	0	10,333	0.4%	16 Feb, 2024
21	Stephanie Okey	Director	8,000	0	8,000	0.3%	12 Mar, 2026
22	Jessica Caroline Chutter	Director	7,333	0	7,333	0.3%	26 Mar, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

1,986 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
14 Oct, 2026	Michael Schmertzler	Director	Disposed S	2,118	$59.52	$126.06K	1,291,976	Indirect
14 Oct, 2026	Michael Schmertzler	Director	Disposed S	382	$60.14	$22.97K	1,291,594	Indirect
09 Oct, 2026	Mark Elliott Boulding	Exec. Vp And Clo	Acquired M	192	$39.42	$7.57K	105,464	Direct
09 Oct, 2026	Mark Elliott Boulding	Exec. Vp And Clo	Disposed S	192	$64.26	$12.34K	105,272	Direct
09 Oct, 2026	Mark Elliott Boulding	Exec. Vp And Clo	Disposed M	192	$0.00	$0	2,267	Direct
07 Oct, 2026	Michael Schmertzler	Director	Disposed S	2,447	$63.38	$155.09K	1,294,147	Indirect
07 Oct, 2026	Michael Schmertzler	Director	Disposed S	53	$63.95	$3.39K	1,294,094	Indirect
05 Oct, 2026	Mark Elliott Boulding	Exec. Vp And Clo	Acquired M	1,638	$39.42	$64.57K	106,910	Direct
05 Oct, 2026	Mark Elliott Boulding	Exec. Vp And Clo	Disposed S	1,638	$64.03	$104.88K	105,272	Direct
06 Oct, 2026	Mark Elliott Boulding	Exec. Vp And Clo	Acquired M	435	$39.42	$17.15K	105,707	Direct
06 Oct, 2026	Mark Elliott Boulding	Exec. Vp And Clo	Disposed S	435	$64.16	$27.91K	105,272	Direct
05 Oct, 2026	Mark Elliott Boulding	Exec. Vp And Clo	Disposed M	1,638	$0.00	$0	2,894	Direct
06 Oct, 2026	Mark Elliott Boulding	Exec. Vp And Clo	Disposed M	435	$0.00	$0	2,459	Direct
30 Sep, 2026	Glenn Jr Md Phd Steele	Director	Acquired M	12,000	$11.23	$134.76K	34,500	Direct
30 Sep, 2026	Glenn Jr Md Phd Steele	Director	Disposed S	12,000	$65.16	$781.92K	22,500	Direct
30 Sep, 2026	Glenn Jr Md Phd Steele	Director	Disposed M	12,000	$0.00	$0	0	Direct
16 Sep, 2026	Michael Schmertzler	Director	Disposed S	2,994	$66.58	$199.34K	1,313,600	Indirect
16 Sep, 2026	Michael Schmertzler	Director	Disposed S	7,006	$67.35	$471.85K	1,306,594	Indirect
17 Sep, 2026	Michael Schmertzler	Director	Disposed S	9,624	$67.83	$652.80K	1,296,970	Indirect
17 Sep, 2026	Michael Schmertzler	Director	Disposed S	376	$68.45	$25.74K	1,296,594	Indirect

Showing 1 to 20 of 1,986 transactions