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Van Herk group reports 10.9% ProQR (PRQR) ownership after share issuances

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(Neutral)
Form Type
SCHEDULE 13D/A

Rhea-AI Filing Summary

ProQR Therapeutics N.V. received an updated ownership filing from Dutch investor Adrianus van Herk and affiliated entities. They report beneficial ownership of 15,384,250 ordinary shares, or about 10.9% of ProQR’s ordinary shares outstanding as of June 26, 2026.

The percentage change is due solely to an increase in ProQR’s total shares outstanding following issuances described in a recent Prospectus Supplement, not from new share purchases or sales by the Van Herk group. The group retains sole or shared voting and dispositive power over the same share amount, and reports no transactions in the past 60 days.

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Beneficial ownership 15,384,250 ordinary shares Aggregate shares held by reporting persons
Ownership percentage 10.9% Portion of ProQR ordinary shares outstanding as of June 26, 2026
Shares outstanding baseline 141,119,032 ordinary shares ProQR shares expected outstanding as of June 26, 2026
Sole voting power (VHI) 15,384,250 shares Ordinary shares over which Van Herk Investments B.V. has sole voting power
Shared voting power (affiliates) 15,384,250 shares Ordinary shares with shared voting power among affiliated entities
Amendment number Amendment No. 6 Sixth amendment to the original Schedule 13D
Event date June 26, 2026 Date of event requiring the amended statement
beneficial ownership financial
"The Reporting Persons hold an aggregate 15,384,250 ordinary shares... representing approximately 10.9% of the ordinary shares outstanding"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
Schedule 13D regulatory
"This /A (this "Amendment No. 6") amends the filed on May 28, 2025..."
A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.
Prospectus Supplement regulatory
"as described in the Issuer's Prospectus Supplement dated June 25, 2026 and filed with the SEC pursuant to Rule 424(b)(5)"
A prospectus supplement is an additional document provided alongside a company's main offering details, offering updated or extra information about a specific financial product being sold. It helps investors understand the latest terms, risks, and details of the investment, similar to how an update or revision clarifies or expands on original instructions, ensuring they have current and complete information before making a decision.
sole voting power financial
"Number of Shares Beneficially Owned by Each Reporting Person With: | 7 | Sole Voting Power 15,384,250.00"
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.
shared dispositive power financial
"Number of Shares Beneficially Owned by Each Reporting Person With: | 10 | Shared Dispositive Power 15,384,250.00"
ordinary shares financial
"Ordinary Shares, nominal value Euro 0.04 per share (Title of Class of Securities)"
Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

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

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FAQ

How many ProQR (PRQR) shares does the Van Herk group own?

The Van Herk group reports beneficial ownership of 15,384,250 ProQR ordinary shares. This stake is held through multiple Dutch entities and foundations associated with investor Adrianus van Herk, giving the group significant influence but not majority control.

What percentage of ProQR (PRQR) is owned by the Van Herk group?

The Van Herk group holds approximately 10.9% of ProQR’s ordinary shares. This percentage is calculated based on 141,119,032 ordinary shares expected to be outstanding as of June 26, 2026, after share issuances described in a Prospectus Supplement.

Did the Van Herk group buy or sell ProQR (PRQR) shares recently?

The filing states there were no transactions in ProQR ordinary shares by the reporting persons in the past sixty days. The updated ownership percentage results from ProQR increasing its total shares outstanding, not from new buying or selling activity.

Why did the Van Herk group’s ProQR (PRQR) ownership percentage change?

The ownership percentage changed solely because ProQR’s outstanding share count increased following issuances described in a Prospectus Supplement. The Van Herk group’s share count remained at 15,384,250; only the denominator used for the percentage changed.

Who are the reporting entities in the ProQR (PRQR) Schedule 13D/A?

Reporting persons include Van Herk Investments B.V., several affiliated Dutch companies, foundations Penulata and Abchrys, and Adrianus van Herk. The structure reflects layered ownership and management entities through which the ProQR stake is held and controlled.

What share count is used to calculate ProQR (PRQR) ownership percentages?

Percentages are based on 141,119,032 ProQR ordinary shares expected to be issued and outstanding as of June 26, 2026. This figure includes the effects of share issuances described in ProQR’s Prospectus Supplement filed under Rule 424(b)(5).





N71542109

(CUSIP Number)
Van Herk Investments B.V.
Lichtenauerlaan 30,,
The Netherlands, P7, 3062 ME
31-10-241-1555


Evan S. Simpson
1 New Fetter Lane,,
London, X0, EC4A 1AN
44 20 795984-26

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)
06/26/2026

(Date of Event Which Requires Filing of This Statement)


If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).




schemaVersion:


SCHEDULE 13D




Comment for Type of Reporting Person:
* Based on 141,119,032 ordinary shares, nominal value Euro 0.04 per share, of ProQR Therapeutics N.V. (the "Issuer") expected to be issued and outstanding as of June 26, 2026, as described in the Issuer's Prospectus Supplement dated June 25, 2026 and filed with the SEC pursuant to Rule 424(b)(5) on June 26, 2026 (the "Prospectus Supplement") (after giving effect to the issuances of shares contemplated therein, which the Prospectus Supplement stated were expected to be completed on June 26, 2026).


SCHEDULE 13D




Comment for Type of Reporting Person:
* Based on 141,119,032 ordinary shares, nominal value Euro 0.04 per share, of the Issuer expected to be issued and outstanding as of June 26, 2026, as described in the Prospectus Supplement (after giving effect to the issuances of shares contemplated therein, which the Prospectus Supplement stated were expected to be completed on June 26, 2026).


SCHEDULE 13D




Comment for Type of Reporting Person:
* Based on 141,119,032 ordinary shares, nominal value Euro 0.04 per share, of the Issuer expected to be issued and outstanding as of June 26, 2026, as described in the Prospectus Supplement (after giving effect to the issuances of shares contemplated therein, which the Prospectus Supplement stated were expected to be completed on June 26, 2026).


SCHEDULE 13D




Comment for Type of Reporting Person:
* Based on 141,119,032 ordinary shares, nominal value Euro 0.04 per share, of the Issuer expected to be issued and outstanding as of June 26, 2026, as described in the Prospectus Supplement (after giving effect to the issuances of shares contemplated therein, which the Prospectus Supplement stated were expected to be completed on June 26, 2026).


SCHEDULE 13D




Comment for Type of Reporting Person:
* Based on 141,119,032 ordinary shares, nominal value Euro 0.04 per share, of the Issuer expected to be issued and outstanding as of June 26, 2026, as described in the Prospectus Supplement (after giving effect to the issuances of shares contemplated therein, which the Prospectus Supplement stated were expected to be completed on June 26, 2026).


SCHEDULE 13D




Comment for Type of Reporting Person:
* Based on 141,119,032 ordinary shares, nominal value Euro 0.04 per share, of the Issuer expected to be issued and outstanding as of June 26, 2026, as described in the Prospectus Supplement (after giving effect to the issuances of shares contemplated therein, which the Prospectus Supplement stated were expected to be completed on June 26, 2026).


SCHEDULE 13D




Comment for Type of Reporting Person:
* Based on 141,119,032 ordinary shares, nominal value Euro 0.04 per share, of the Issuer expected to be issued and outstanding as of June 26, 2026, as described in the Prospectus Supplement (after giving effect to the issuances of shares contemplated therein, which the Prospectus Supplement stated were expected to be completed on June 26, 2026).


SCHEDULE 13D




Comment for Type of Reporting Person:
* Based on 141,119,032 ordinary shares, nominal value Euro 0.04 per share, of the Issuer expected to be issued and outstanding as of June 26, 2026, as described in the Prospectus Supplement (after giving effect to the issuances of shares contemplated therein, which the Prospectus Supplement stated were expected to be completed on June 26, 2026).


SCHEDULE 13D




Comment for Type of Reporting Person:
* Based on 141,119,032 ordinary shares, nominal value Euro 0.04 per share, of the Issuer expected to be issued and outstanding as of June 26, 2026, as described in the Prospectus Supplement (after giving effect to the issuances of shares contemplated therein, which the Prospectus Supplement stated were expected to be completed on June 26, 2026).


SCHEDULE 13D


Van Herk Investments B.V.
Signature:/s/ Erik G.A. Esveld
Name/Title:Erik G.A. Esveld/Attorney-In-Fact*
Date:06/30/2026
Van Herk Investments THI B.V.
Signature:/s/ Erik G.A. Esveld
Name/Title:Erik G.A. Esveld/Attorney-In-Fact*
Date:06/30/2026
Van Herk Private Equity Investments B.V.
Signature:/s/ Erik G.A. Esveld
Name/Title:Erik G.A. Esveld/Attorney-In-Fact*
Date:06/30/2026
Stichting Administratiekantoor Penulata
Signature:/s/ Erik G.A. Esveld
Name/Title:Erik G.A. Esveld/Attorney-In-Fact*
Date:06/30/2026
Van Herk Management Services B.V.
Signature:/s/ Erik G.A. Esveld
Name/Title:Erik G.A. Esveld/Attorney-In-Fact*
Date:06/30/2026
Onroerend Goed Beheer- en Beleggingsmaatschappij A. van Herk B.V.
Signature:/s/ Erik G.A. Esveld
Name/Title:Erik G.A. Esveld/Attorney-In-Fact*
Date:06/30/2026
A. van Herk Holding B.V.
Signature:/s/ Erik G.A. Esveld
Name/Title:Erik G.A. Esveld/Attorney-In-Fact*
Date:06/30/2026
Stichting Administratiekantoor Abchrys
Signature:/s/ Erik G.A. Esveld
Name/Title:Erik G.A. Esveld/Attorney-In-Fact*
Date:06/30/2026
Adrianus van Herk
Signature:/s/ Erik G.A. Esveld
Name/Title:Erik G.A. Esveld/Attorney-In-Fact*
Date:06/30/2026
Comments accompanying signature:
* Pursuant to a Power of Attorney, dated as of September 16, 2019, by and among the Reporting Persons.