Vanguard (NASDAQ: PTCT) holds 4.87M PTC Therapeutics shares

Rhea-AI Filing Summary

Vanguard Portfolio Management reports beneficial ownership of 4,871,329 shares of PTC Therapeutics common stock, representing 5.88% of the class as of 03/31/2026. The filing shows sole voting power of 66,735 shares and sole dispositive power over 4,871,329 shares. The statement clarifies holdings reflect assets managed across Vanguard affiliates and funds.

Key Figures

Beneficial ownership: 4,871,329 shares Percent of class: 5.88% Sole voting power: 66,735 shares +3 more

6 metrics

Beneficial ownership 4,871,329 shares Amount beneficially owned reported in Schedule 13G

Percent of class 5.88% Percent of common stock class as stated in the filing

Sole voting power 66,735 shares Shares for which Vanguard has sole power to vote

Sole dispositive power 4,871,329 shares Shares for which Vanguard has sole power to dispose

Reporting CUSIP 69366J200 CUSIP for PTC Therapeutics common stock shown on the form

Filing signature date 04/29/2026 Date the Schedule 13G was signed

Key Terms

beneficially owned, sole dispositive power, sole voting power, Investment Company Act of 1940

4 terms

beneficially owned regulatory

"this reflects the securities beneficially owned, or deemed to be beneficially owned"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 4871329"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

sole voting power regulatory

"Sole power to vote or to direct the vote: 66735"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

Investment Company Act of 1940 regulatory

"investment company registered under the Investment Company Act of 1940"

A U.S. federal law that sets the rulebook for pooled investment vehicles such as mutual funds, exchange-traded funds and similar money managers, requiring them to register with regulators, disclose holdings and fees, limit conflicts of interest, and follow governance standards. It matters to investors because these protections and transparency rules act like a referee and scoreboard, helping people compare funds, trust that managers follow fair practices, and spot hidden costs or risks.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/29/2026 - 02:49 PM Learn about SEC filing dates

FAQ

How many PTC Therapeutics (PTCT) shares does Vanguard report owning?

Vanguard reports owning 4,871,329 shares of PTCT common stock. The filing lists this as 5.88% of the class as of 03/31/2026, with dispositive power held by Vanguard Portfolio Management and related affiliates across managed funds and accounts.

What voting and dispositive powers does Vanguard hold for PTCT?

Vanguard has sole voting power for 66,735 shares and sole dispositive power for 4,871,329 shares. The filing distinguishes voting power (ability to direct votes) from dispositive power (ability to direct sales or transfers) across Vanguard-managed accounts and affiliates.

Does Vanguard own more than 5% of PTC Therapeutics common stock?

Yes. The filing reports 5.88% ownership. The Schedule 13G lists this percentage based on 4,871,329 shares beneficially owned as of 03/31/2026, meeting the disclosure threshold for large passive investors under SEC rules.

Who filed the Schedule 13G for PTC Therapeutics on behalf of Vanguard?

The filing was made by Vanguard Portfolio Management. The signature block shows Ashley Grim, Head of Global Fund Administration, signed the form on 04/29/2026, and the filing notes holdings include shares across Vanguard funds and affiliated advisory divisions.

Does the filing indicate Vanguard controls other holders over 5% for PTCT?

No single other person is identified above 5%. The Schedule 13G states Vanguard Portfolio Management manages shares for funds and accounts; it reports that no other person known to Vanguard has the right to receive proceeds or dividends exceeding the 5% threshold.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

PTC Therapeutics Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

69366J200

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 69366J200

1

Names of Reporting Persons

Vanguard Portfolio Management

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 66,735.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 4,871,329.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,871,329.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.88 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by Vanguard Portfolio Management LLC and the following affiliates of Vanguard Portfolio Management LLC or business divisions of such affiliates: Vanguard Fiduciary Trust Company and Vanguard Global Advisers, LLC. This Schedule 13G includes securities held by Vanguard funds, or sleeves thereof, over which Vanguard Portfolio Management LLC exercises dispositive power, in addition to securities held by clients over which the affiliates or business divisions of such affiliates indicated above exercise dispositive and/or voting power. This Schedule 13G does not include securities, if any, beneficially owned by other subsidiaries or affiliates of Vanguard Portfolio Management LLC, or business divisions of such subsidiaries whose ownership of securities is disaggregated from that of the reporting business unit in accordance with such release.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: PTC Therapeutics Inc
(b)	Address of issuer's principal executive offices: 100 Corporate Court, South Plainfield, NJ, 07080
Item 2.
(a)	Name of person filing: Vanguard Portfolio Management
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd,, Malvern, PA, 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 69366J200
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 4871329
(b)	Percent of class: 5.88 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 66735
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 4871329
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Vanguard Portfolio Management, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.No one other person's interest in the securities reported herein is more than 5%.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Vanguard Portfolio Management

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	04/29/2026