David Lazar reports 94.3% ownership of Quantum Cyber (QUCY)

Rhea-AI Filing Summary

David E. Lazar reports updated beneficial ownership in Quantum Cyber N.V. (formerly Mainz Biomed N.V.), holding 477,000,000 Ordinary Shares, which represents 94.3% of the company’s Ordinary Shares. He has sole voting and sole dispositive power over all reported shares.

His reported holdings comprise 55,057,500 issued Ordinary Shares, 196,942,500 Ordinary Shares issuable upon conversion of Series D Preferred Shares, and 225,000,000 Ordinary Shares issuable upon conversion of Series E Preferred Shares. On August 5, 2026, he converted 1,000,000 Series A, 1,000,000 Series B, 1,000,000 Series C, and 124,700 Series D Preferred Shares into 9,000,000, 9,000,000, 9,000,000, and 28,057,500 Ordinary Shares, respectively, for no additional consideration. The ownership percentage is calculated using 84,068,192 Ordinary Shares outstanding as of August 7, 2026, plus the Series D and Series E conversion shares.

Key Figures

Beneficial ownership: 477,000,000 Ordinary Shares Ownership percentage: 94.3 % Shares outstanding: 84,068,192 Ordinary Shares +5 more

8 metrics

Beneficial ownership 477,000,000 Ordinary Shares Aggregate Quantum Cyber Ordinary Shares beneficially owned by David E. Lazar

Ownership percentage 94.3 % Percent of Quantum Cyber Ordinary Shares represented by Lazar’s beneficial ownership

Shares outstanding 84,068,192 Ordinary Shares Quantum Cyber Ordinary Shares outstanding as of August 7, 2026

Issued Ordinary Shares held 55,057,500 Ordinary Shares Issued Quantum Cyber Ordinary Shares included in Lazar’s beneficial ownership

Series D conversion component 196,942,500 Ordinary Shares Ordinary Shares issuable upon conversion of Series D Preferred Shares included in ownership

Series E conversion component 225,000,000 Ordinary Shares Ordinary Shares issuable upon conversion of Series E Preferred Shares included in ownership

Series A Preferred converted 1,000,000 Series A Preferred Shares Converted into 9,000,000 Ordinary Shares on August 5, 2026

Series D Preferred converted 124,700 Series D Preferred Shares Converted into 28,057,500 Ordinary Shares on August 5, 2026

Key Terms

beneficially owned, sole voting power, Series D Preferred Shares, Series E Preferred Shares, +1 more

5 terms

beneficially owned financial

"The aggregate number and percentage of the class of securities identified ... beneficially owned by the Reporting Person"

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 voting power financial

"Number of Shares Beneficially Owned by Each Reporting Person With: sole voting power 477,000,000.00"

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.

Series D Preferred Shares financial

"196,942,500 Ordinary Shares ... issuable upon conversion of the Series D Preferred Shares of the Issuer"

Series E Preferred Shares financial

"225,000,000 Ordinary Shares ... issuable upon conversion of the Series E Preferred Shares of the Issuer"

Series E preferred shares are a specific class of stock issued later in a company’s fundraising that gives holders priority over common shareholders for dividend payments and claims on assets. Think of them as a later-issued “front-of-line” ticket that often includes rights to convert into common stock and to receive money before common holders in a sale or bankruptcy, so their presence affects potential payouts, ownership dilution, and control for all investors.

Ordinary Shares financial

"Ordinary Shares, nominal value (euro)0.01 per share"

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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Available on EDGAR 08/07/2026 - 06:50 PM Accepted by SEC EDGAR 08/07/2026 - 06:50 PM Learn about SEC filing dates

FAQ

What ownership stake did David E. Lazar report in Quantum Cyber (QUCY)?

David E. Lazar reported beneficial ownership of 477,000,000 Ordinary Shares of Quantum Cyber, representing 94.3% of the outstanding Ordinary Shares. He holds sole voting and sole dispositive power over all of these shares.

How is David Lazar’s Quantum Cyber (QUCY) position structured between issued and convertible shares?

His position includes 55,057,500 issued Ordinary Shares, plus 196,942,500 Ordinary Shares issuable upon conversion of Series D Preferred Shares and 225,000,000 Ordinary Shares issuable upon conversion of Series E Preferred Shares, all counted toward his reported beneficial ownership.

What preferred share conversions did David E. Lazar complete on August 5, 2026 for QUCY?

On August 5, 2026, he converted 1,000,000 Series A, 1,000,000 Series B, 1,000,000 Series C, and 124,700 Series D Preferred Shares into 9,000,000, 9,000,000, 9,000,000, and 28,057,500 Ordinary Shares, respectively, all for no additional consideration.

How was the 94.3% ownership percentage for Quantum Cyber (QUCY) calculated?

The 94.3% figure is based on 84,068,192 Quantum Cyber Ordinary Shares outstanding as of August 7, 2026, plus 196,942,500 Ordinary Shares issuable upon conversion of Series D Preferred Shares and 225,000,000 Ordinary Shares issuable upon conversion of Series E Preferred Shares.

What is David E. Lazar’s reported business address related to his Quantum Cyber (QUCY) holdings?

His principal business address is 200 Connecticut Ave., Suite 400, Norwalk, CT 06854. This address is listed as the location for notices and communications concerning his beneficial ownership in Quantum Cyber’s Ordinary Shares.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 1)

Quantum Cyber N.V.

(Name of Issuer)

Ordinary Shares, nominal value (euro)0.01 per share

(Title of Class of Securities)

N5436L119

(CUSIP Number)

David E. Lazar
200 Connecticut Ave. Suite 400,
Norwalk, CT, 06854
646-768-8417

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

08/05/2026

(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

CUSIP Number(s): N5436L119

1

Name of reporting person

Lazar David E.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

PORTUGAL

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 477,000,000.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 477,000,000.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

477,000,000.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

94.3 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

(1) The figure reported in Items 7, 9, and 11 on this cover page includes (i) 55,057,500 Ordinary Shares of the Issuer, (ii) 196,942,500 Ordinary Shares of the Issuer issuable upon conversion of the Series D Preferred Shares of the Issuer, and (iii) 225,000,000 Ordinary Shares of the Issuer issuable upon conversion of the Series E Preferred Shares of the Issuer. (2) The percentage reported in Item 13 on this cover page is based on (i) 84,068,192 Ordinary Shares of the Issuer outstanding as of August 7, 2026, as confirmed by the Issuer on August 7, 2026, (ii) 196,942,500 Ordinary Shares of the Issuer issuable upon conversion of the Series D Preferred Shares of the Issuer, and (iii) 225,000,000 Ordinary Shares of the Issuer issuable upon conversion of the Series E Preferred Shares of the Issuer.

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Ordinary Shares, nominal value (euro)0.01 per share
(b)	Name of Issuer: Quantum Cyber N.V.
(c)	Address of Issuer's Principal Executive Offices: 200 Connecticut Ave. Suite 400, Norwalk, CONNECTICUT , 06854.
Item 1 Comment: The Issuer was formerly known as Mainz Biomed N.V. and changed its name to Quantum Cyber N.V. in April 2026. This Amendment No. 1 to the Schedule 13D (this "Amendment") amends and supplements the initial Schedule 13D filed by David E. Lazar (the "Reporting Person") with the U.S. Securities and Exchange Commission (the "SEC") on April 28, 2026 (together with this Amendment, the "Schedule 13D" or the "Statement"). Capitalized terms used but not defined in this Amendment shall have the meanings set forth in the Schedule 13D. Except as amended, restated and/or supplemented by this Amendment, the Schedule 13D remains unchanged.
Item 2.	Identity and Background
(b)	Item 2(b) of the Schedule 13D is hereby amended and restated as follows: "The principal business address of the Reporting Person is 200 Connecticut Ave. Suite 400, Norwalk, CT 06854."
Item 3.	Source and Amount of Funds or Other Consideration
	Item 3 of the Schedule 13D is hereby amended and supplemented as follows: "On August 5, 2026, the Reporting Person converted (i) 1,000,000 Series A Preferred Shares of the Issuer into 9,000,000 Ordinary Shares of the Issuer, (ii) 1,000,000 Series B Preferred Shares of the Issuer into 9,000,000 Ordinary Shares of the Issuer, (iii) 1,000,000 Series C Preferred Shares of the Issuer into 9,000,000 Ordinary Shares of the Issuer, and (iv) 124,700 Series D Preferred Shares of the Issuer into 28,057,500 Ordinary Shares of the Issuer (each of the foregoing for no additional consideration)."
Item 5.	Interest in Securities of the Issuer
(a)	Item 5(a) of the Schedule 13D is hereby amended and restated as follows: "The aggregate number and percentage of the class of securities identified pursuant to Item 1 beneficially owned by the Reporting Person is stated in Items 11 and 13 on the cover page hereto."
(b)	Item 5(b) of the Schedule 13D is hereby amended and restated as follows: "Number of shares as to which the Reporting Person has: (i) sole power to vote or to direct the vote: See Item 7 on the cover page hereto. (ii) shared power to vote or to direct the vote: See Item 8 on the cover page hereto. (iii) sole power to dispose or to direct the disposition of: See Item 9 on the cover page hereto. (iv) shared power to dispose or to direct the disposition of: See Item 10 on the cover page hereto."
(c)	Item 5(c) of the Schedule 13D is hereby amended and restated as follows: "Except as disclosed in Item 3 of the Schedule 13D, which is incorporated herein by reference, no transactions in the Ordinary Shares of the Issuer were effected by the Reporting Person during the past 60 days or the since the most recent filing of Schedule 13D, whichever is less."

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.

Lazar David E.

Signature:	/s/ David E. Lazar
Name/Title:	David E. Lazar
Date:	08/07/2026