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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 20-F

(Mark One)

☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2025

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

☐ SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number:001-41180

(Exact name of Registrant as specified in its charter)

Not applicable The Netherlands

(Translation of Registrant’s name into English) (Jurisdiction of incorporation or organization)

Viale Roma 99/100 13835

Valdilana loc. Trivero

Italy

Tel: +39 01575911

(Address of principal executive offices)

Gian Franco Santhià

Tel: +39 01575911

Facsimile: +39 015756139

Viale Roma 99/100,13835 Valdilana loc. Trivero, Italy

(Name, Telephone, Email and/or Facsimile number and Address of Company Contact Person)

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered
Ordinary Shares, nominal value €0.02 per shareZGNNew York Stock Exchange

Securities registered or to be registered pursuant to Section 12(g) of the Act: None

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act: None

Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report:

At December 31, 2025, the issuer had 268,240,430 ordinary shares, nominal value €0.02 per share, and 154,981,350 special voting shares A, nominal value €0.02 per share, outstanding.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☒No☐

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Yes☐No ☒

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒No☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒No☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer☒Accelerated filer☐
Non-accelerated filer☐Emerging growth company☐

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards† provided pursuant to Section 13(a) of the Exchange Act.☐

The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012.

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.☒

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements.☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to § 240.10D-1(b). ☐

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:

U.S. GAAP ☐International Financial Reporting Standards as issued by the International Accounting Standards Board ☒Other ☐

If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow. Item 17☐Item 18☐

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes☐ No☒

TABLE OF CONTENTS

Page
CERTAIN DEFINED TERMS1
NOTE ON PRESENTATION4
TRADEMARKS, SERVICE MARKS AND TRADE NAMES4
MARKET AND INDUSTRY INFORMATION4
CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS5
PART I7
ITEM 1 IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS7
ITEM 2 OFFER STATISTICS AND EXPECTED TIMETABLE7
ITEM 3 KEY INFORMATION7
A. [Reserved]7
B. Capitalization and Indebtedness7
C. Reasons for the Offer and Use of Proceeds7
D. Risk Factors7
ITEM 4 INFORMATION ON THE COMPANY29
A. History and Development of the Company29
B. Business Overview31
C. Organizational Structure45
D. Property, Plants and Equipment45
ITEM 4A UNRESOLVED STAFF COMMENTS46
ITEM 5 OPERATING AND FINANCIAL REVIEW AND PROSPECTS47
A. Operating Results47
B. Liquidity and Capital Resources77
C. Research and Development, Patents and Licenses86
D. Trend Information86
E. Critical Accounting Estimates86
ITEM 6 DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES101
A. Directors and Senior Management101
B. Compensation110
C. Board Practices118
D. Employees120
E. Share Ownership121
F. Disclosure of a Registrant’s Action to Recover Erroneously Awarded Compensation121
ITEM 7 MAJOR SHAREHOLDERS AND RELATED PARTY TRANSACTIONS122
A. Major Shareholders122
B. Related Party Transactions123
C. Interests of Experts and Counsel124
ITEM 8 FINANCIAL INFORMATION124
A. Consolidated Statements and Other Financial Information124
B. Significant changes126
ITEM 9 THE OFFER AND LISTING127
A. Offer and Listing Details127
B. Plan of Distribution127
C. Markets127
D. Selling Shareholders127
E. Dilution127
F. Expenses of the Issue127

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ITEM 10 ADDITIONAL INFORMATION127
A. Share Capital127
B. Memorandum and Articles of Association127
C. Material Contracts141
D. Exchange Controls141
E. Taxation141
F. Dividends and Paying Agents165
G. Statement by Experts165
H. Documents on Display165
I. Subsidiary Information165
ITEM 11 QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISKS166
ITEM 12 DESCRIPTION OF SECURITIES OTHER THAN EQUITY SECURITIES166
A. Debt Securities166
B. Warrants and Rights166
C. Other Securities166
D. American Depositary Shares166
PART II167
ITEM 13 DEFAULTS, DIVIDEND ARREARAGES AND DELINQUENCIES167
ITEM 14 MATERIAL MODIFICATIONS TO THE RIGHTS OF SECURITY HOLDERS AND USE OF PROCEEDS167
ITEM 15 CONTROLS AND PROCEDURES167
ITEM 16A AUDIT COMMITTEE FINANCIAL EXPERT170
ITEM 16B CODE OF ETHICS170
ITEM 16C PRINCIPAL ACCOUNTANT FEES AND SERVICES170
ITEM 16D EXEMPTIONS FROM THE LISTING STANDARDS FOR AUDIT COMMITTEES170
ITEM 16E PURCHASES OF EQUITY SECURITIES BY THE ISSUER AND AFFILIATED PURCHASERS170
ITEM 16F CHANGE IN REGISTRANT’S CERTIFYING ACCOUNTANT171
ITEM 16G CORPORATE GOVERNANCE171
ITEM 16H MINE SAFETY DISCLOSURE172
ITEM 16I DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS172
ITEM 16J INSIDER TRADING POLICIES172
ITEM 16K CYBERSECURITY172
PART III174
ITEM 17 FINANCIAL STATEMENTS174
ITEM 18 FINANCIAL STATEMENTS174
ITEM 19 EXHIBITS175

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.