Company · Ownership research

PTC THERAPEUTICS, INC. PTCT

CIK 0001070081 · CUSIP 69366J200

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 69366J200 (PTCT), not CUSIP 69366J900 (PTCT), CUSIP 69366J950 (PTCT), and does not merge CUSIPs.

This page lists the top 20 of 353 rows by value; the complete set is available through the API.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$882.20M 12,948,717 shares	0.02%	+169.65K(+1.30%)Added	SEC filing ↗ May 13, 2026	▾
02	RTW INVESTMENTS, LP CIK 1493215 · View history	$527.76M 7,746,415 shares	5.25%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2026	▾
03	JANUS HENDERSON GROUP PLC CIK 1274173 · Amended · View history	$490.00M 7,193,433 shares	0.23%	+2.34M(+48.30%)Added	SEC filing ↗ May 18, 2026	▾
04	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$327.34M 4,804,594 shares	0.02%	—	SEC filing ↗ May 8, 2026	▾
05	STATE STREET CORP CIK 93751 · View history	$296.13M 4,346,519 shares	0.01%	+140.39K(+3.30%)Added	SEC filing ↗ May 15, 2026	▾
06	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$268.61M 3,942,610 shares	0.05%	+75.23K(+1.90%)Added	SEC filing ↗ May 15, 2026	▾
07	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$250.46M 3,676,256 shares	0.01%	—	SEC filing ↗ May 15, 2026	▾
08	TORONTO DOMINION BANK CIK 947263 · View history	$206.16M 3,025,963 shares	0.40%	-1.11M(-26.90%)Reduced	SEC filing ↗ May 15, 2026	▾
09	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$150.59M 2,209,954 shares	0.01%	+193.89K(+9.60%)Added	SEC filing ↗ May 15, 2026	▾
10	ARMISTICE CAPITAL, LLC CIK 1601086 · View history	$141.33M 2,074,449 shares	4.67%	-727.42K(-26.00%)Reduced	SEC filing ↗ May 15, 2026	▾
11	BANK OF AMERICA CORP /DE/ CIK 70858 · View history	$128.55M 1,886,841 shares	0.01%	+455.28K(+31.80%)Added	SEC filing ↗ May 18, 2026	▾
12	Hood River Capital Management LLC CIK 1578177 · View history	$113.41M 1,664,559 shares	1.14%	+661.48K(+65.90%)Added	SEC filing ↗ May 15, 2026	▾
13	D. E. Shaw & Co., Inc. CIK 1009207 · View history	$111.76M 1,640,381 shares	0.09%	-104.61K(-6.00%)Reduced	SEC filing ↗ May 15, 2026	▾
14	FMR LLC CIK 315066 · View history	$104.13M 1,528,362 shares	0.01%	-152.85K(-9.10%)Reduced	SEC filing ↗ May 15, 2026	▾
15	TANG CAPITAL MANAGEMENT LLC CIK 1232621 · View history	$102.19M 1,500,000 shares	5.19%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2026	▾
16	UBS Group AG CIK 1610520 · View history	$92.98M 1,364,768 shares	0.02%	+400.11K(+41.50%)Added	SEC filing ↗ May 5, 2026	▾
17	Jefferies Financial Group Inc. CIK 96223 · View history	$92.28M 1,354,459 shares	1.13%	-304.02K(-18.30%)Reduced	SEC filing ↗ May 8, 2026	▾
18	Pictet Asset Management Holding SA CIK 1993888 · View history	$80.06M 1,183,720 shares	0.08%	+204.76K(+20.90%)Added	SEC filing ↗ Apr 22, 2026	▾
19	FRANKLIN RESOURCES INC CIK 38777 · View history	$76.40M 1,121,388 shares	0.02%	-165.30K(-12.80%)Reduced	SEC filing ↗ May 13, 2026	▾
20	Driehaus Capital Management LLC CIK 938206 · View history	$69.20M 1,015,772 shares	0.51%	-120.42K(-10.60%)Reduced	SEC filing ↗ May 15, 2026	▾

Showing 20 / 353 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

353

Cancelled or null records excluded

Disclosed shares

95,527,235

Not deduplicated across managers

Disclosed value

$6.51B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

PTC THERAPEUTICS, INC. · Q1 2026

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.