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Related party transactions - Schedule of Transactions with Related Parties (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of transactions between related parties [line items] |  |  |
Revenues | € 1,916,947 | € 1,946,647 | € 1,904,549
Cost of sales | 622,910 | 650,087 | 680,235
Selling, general and administrative expenses | 1,033,871 | 1,008,324 | 901,364
Marketing expenses | 120,686 | 121,384 | 114,802
Foreign exchange gains | 9,000 | (11,338) | (5,262)
Zegna Group |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 1,916,947 | 1,946,647 | 1,904,549
Cost of sales | 622,910 | 650,087 | 680,235
Selling, general and administrative expenses | 1,033,871 | 1,008,324 | 901,364
Marketing expenses | 120,686 | 121,384 | 114,802
Financial income/(expenses) | (8,962) | (25,967) | (30,839)
Foreign exchange gains | 9,000 | (11,338) | (5,262)
Norda Run Inc. |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 15,201 |  |
Luigi Fedeli e Figlio S.r.l. |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 27,030 |  |
Associates |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 15 | 62 | 3,324
Cost of sales | 4,016 | 6,467 | 7,227
Selling, general and administrative expenses | 21 | 65 | 1,003
Marketing expenses | 0 | 0 | 0
Financial income/(expenses) | 0 | (5) | 89
Foreign exchange gains | (1) | 0 | (14)
Associates | TFI Group |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 0 | 0 | 3,233
Cost of sales | 0 | 0 | 288
Selling, general and administrative expenses | 0 | 0 | 740
Marketing expenses | 0 | 0 | 0
Financial income/(expenses) | 0 | 0 | (7)
Foreign exchange gains | 0 | 0 | 0
Royalties |  | 181 |
Associates | Filati Biagioli Modesto S.p.A. |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 0 | 0 | 5
Cost of sales | 4,016 | 5,782 | 4,782
Selling, general and administrative expenses | 20 | 65 | 141
Marketing expenses | 0 | 0 | 0
Financial income/(expenses) | 0 | 0 | 96
Foreign exchange gains | 0 | 0 | 0
Associates | Norda Run Inc. |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 0 | 0 | 0
Cost of sales | 0 | 138 | 2,072
Selling, general and administrative expenses | 1 |  | 122
Selling, general and administrative expenses |  | (4) |
Marketing expenses | 0 | 0 | 0
Financial income/(expenses) | 0 | 0 | 0
Foreign exchange gains | (1) | 0 | (14)
Associates | Luigi Fedeli e Figlio S.r.l. |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 15 | 62 | 86
Cost of sales | 0 | 547 | 85
Selling, general and administrative expenses | 0 | 4 | 0
Marketing expenses | 0 | 0 | 0
Financial income/(expenses) | 0 | (5) | 0
Foreign exchange gains | 0 | 0 | 0
Companies controlled by Monterubello or its shareholders, the Company’s directors or Senior Management Team | EZ Real Estate |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 14 | 14 | 4
Cost of sales | 2,618 | 2,534 | 2,580
Selling, general and administrative expenses | 3,871 | 4,187 | 4,100
Marketing expenses | 2,040 | 2,106 | 2,072
Financial income/(expenses) | (691) | (744) | (545)
Foreign exchange gains | 0 | 0 | 0
Companies controlled by Monterubello or its shareholders, the Company’s directors or Senior Management Team | Schneider Group |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 0 | 6 | 25
Cost of sales | 8,979 | 13,398 | 14,209
Selling, general and administrative expenses | 73 |  | 14
Selling, general and administrative expenses |  | (1) |
Marketing expenses | 0 | 0 | 0
Financial income/(expenses) | 0 | 0 | 0
Foreign exchange gains | 15 | 0 | 0
Companies controlled by Monterubello or its shareholders, the Company’s directors or Senior Management Team | Alan Real Estate S.A. |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 0 | 0 | 0
Cost of sales | 1,765 | 1,730 | 1,650
Selling, general and administrative expenses | 3,492 | 3,160 | 3,100
Marketing expenses | 0 | 0 | 0
Financial income/(expenses) | (1,627) | (1,708) | (310)
Foreign exchange gains | 11 | 0 | (8)
Companies controlled by Monterubello or its shareholders, the Company’s directors or Senior Management Team | Agnona S.r.l. |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 206 | 70 | 64
Cost of sales | 42 | 55 | 35
Selling, general and administrative expenses | 275 | 261 | 210
Marketing expenses | 57 | 67 | 32
Financial income/(expenses) | 0 | (1) | (1)
Foreign exchange gains | (3) | 0 | (1)
Companies controlled by Monterubello or its shareholders, the Company’s directors or Senior Management Team | Other companies controlled by Monterubello or its shareholders, Zegna directors or senior management |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 150 | 341 | 195
Cost of sales | 5,127 | 5,632 | 5,827
Selling, general and administrative expenses | 593 | 1,311 | 614
Marketing expenses | 14 | 39 | 6
Financial income/(expenses) | 1 | 4 | 3
Foreign exchange gains | 3 | 0 | 0
UBS Group AG |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 0 | 0 | 0
Cost of sales | 0 | 0 | 0
Selling, general and administrative expenses | 1,273 | 559 | 3,108
Marketing expenses | 0 | 0 | 0
Financial income/(expenses) | 419 | (1,519) | (1,522)
Foreign exchange gains | (971) | (1,746) | 350
Other |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 0 | 0 | 0
Cost of sales | 0 | 0 | 0
Selling, general and administrative expenses | 2,628 | 2,754 | 3,038
Marketing expenses | 0 | 0 | 0
Financial income/(expenses) | 0 | 0 | 0
Foreign exchange gains | 0 | 0 | 0
Total transactions with related parties |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 385 | 493 | 3,612
Cost of sales | 22,547 | 29,816 | 31,528
Selling, general and administrative expenses | 12,226 | 12,296 | 15,187
Marketing expenses | 2,111 | 2,212 | 2,110
Financial income/(expenses) | (1,898) | (3,973) | (2,286)
Foreign exchange gains | € (946) | € (1,746) | € 327

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