XML 109 R78.htm IDEA: XBRL DOCUMENT
v3.26.1

Shareholders’ equity - Change in share capital (Details) € / shares in Units, € in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 25, 2025 € / shares shares | Aug. 28, 2025 EUR (€) shares | Aug. 08, 2025 € / shares shares | Jul. 30, 2025 EUR (€) note € / shares shares | Jul. 30, 2025 EUR (€) note € / shares shares | Jul. 28, 2025 € / shares shares | Oct. 24, 2023 € / shares shares | May 24, 2023 EUR (€) € / shares shares | Feb. 22, 2023 EUR (€) € / shares shares | Mar. 31, 2024 shares | Oct. 31, 2020 shares | Dec. 31, 2025 EUR (€) € / shares shares | Dec. 31, 2024 EUR (€) € / shares shares | Dec. 31, 2023 EUR (€) € / shares shares | Jul. 28, 2025 $ / shares | Jul. 23, 2025 note | Nov. 19, 2024 € / shares | Oct. 24, 2023 $ / shares | Aug. 22, 2023 € / shares | Aug. 20, 2023 € / shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares | € |  |  |  |  |  |  |  |  | € 130,000 |  |  | € 637,462 |  | € 353,377 |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) |  |  |  |  |  |  | 20,325,500 |  | 20,000,000 |  |  | 11,679,400 |  | 40,325,500 |  |  |  |  |  |
Par value per share (in euro per share) | € / shares |  |  |  |  |  |  | € 0.01 | € 0.01 | € 0.01 |  |  | € 0.01 | € 0.01 | € 0.01 |  |  | € 0.01 |  |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  |  | € 6.50 |  |  |  |  |  |  |  |  |  |  |
Exercises of the Kreos/Claret and other share warrants | € |  | € 11,531 |  |  | € 15,143 |  |  |  |  |  |  |  | € 45 |  |  |  |  |  |  |
Exercises of share warrants (in shares) |  |  |  |  |  |  |  |  |  |  | 464,309 |  | 4,000 |  |  |  |  |  |  |
Share issue related cost | € |  |  |  |  |  |  |  |  |  |  |  |  |  | € 28,111 |  |  |  |  |  |
Transaction costs related to capital increase | € |  |  |  |  |  |  |  |  |  |  |  | € (40,306) | € 446 | (28,111) |  |  |  |  |  |
Issue of free shares (in shares) |  |  |  |  |  |  |  |  |  |  |  | 627,714 | 415,019 |  |  |  |  |  |  |
Closing foreign exchange rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.1726 |  |  |  |
Heights convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity issuance, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 14.4303
Number of convertible notes converted | note |  |  |  | 200 | 200 |  |  |  |  |  |  |  |  |  |  | 150 |  |  |  |
Notional amount | € |  |  |  | € 21,900 | € 21,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in number of ordinary shares issued (in shares) |  |  |  | 920,377 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, fixed conversion price (in euro per share) | € / shares |  |  |  | € 23.7674 | € 23.7674 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kreos & Claret convertible notes (OCABSA) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, fixed conversion price (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 21.2209 |
ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) |  |  |  |  |  | 11,679,400 | 18,699,460 |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of equity, offering price per share (in dollar/euro per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64.00 |  |  | $ 11.60 |  |
Increase (decrease) in number of ordinary shares issued (in shares) |  |  |  |  |  | 11,679,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increase from issuance of ordinary shares (in shares) |  |  |  |  |  |  | 1,626,040 |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of equity, offering price per share (in dollar/euro per share) | € / shares |  |  |  |  |  | € 54.58 | € 10.9864 |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares | Kreos & Claret convertible notes (OCABSA) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in number of ordinary shares issued (in shares) | 392,695 |  | 785,389 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, fixed conversion price (in euro per share) | € / shares | € 21.2209 |  | € 21.2209 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares | Kreos A & B & C BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in number of ordinary shares issued (in shares) |  | 206,662 |  |  | 319,251 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BSA-2024-1 and BSA-2024-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments issued (in shares) |  |  |  |  |  |  |  |  |  | 77,820 |  |  |  |  |  |  |  |  |  |
Share warrants, subscription price (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  | € 2.57 |  |  |  |  |  |  |
Kreos A & B BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercises of the Kreos/Claret and other share warrants | € |  |  |  |  |  |  |  | € 1,850 |  |  |  |  |  | € 1,850 |  |  |  |  |  |
Exercises of share warrants (in shares) |  |  |  |  |  |  |  | 99,583 |  |  |  |  |  | 99,583 |  |  |  |  |  |
Other share warrants, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  | € 18.57 |  |  |  |  |  |  |  |  |  |  |  |
Kreos A & B BSA | Kreos A BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised (in shares) |  |  |  |  |  |  |  | 67,887 |  |  |  |  |  |  |  |  |  |  |  |
Kreos A & B BSA | Kreos B BSA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised (in shares) |  |  |  |  |  |  |  | 31,696 |  |  |  |  |  |  |  |  |  |  |  |
Other equity agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  | 257,087 | 4,000 | 1,906 |  |  |  |  |  |
Exercises of the Kreos/Claret and other share warrants | € |  |  |  |  |  |  |  |  |  |  |  | € 3,346 |  | € 2 |  |  |  |  |  |
Exercises of share warrants (in shares) |  |  |  |  |  |  |  |  |  |  |  | 257,087 | 4,000 | 190,550 |  |  |  |  |  |
Other share warrants, subscripion price per share (in euro per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  | € 13.02 | € 11.14 | € 0.01 |  |  |  |  |  |

X
- Definition Borrowings, Fixed Conversion Price + References No definition available. + Details
Name: | abvx_BorrowingsFixedConversionPrice
Namespace Prefix: | abvx_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Equity Issuance, Subscription Price Per Share + References No definition available. + Details
Name: | abvx_EquityIssuanceSubscriptionPricePerShare
Namespace Prefix: | abvx_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Increase (Decrease) In Number Of Ordinary Shares Issued Through Capital Increase + References No definition available. + Details
Name: | abvx_IncreaseDecreaseInNumberOfOrdinarySharesIssuedThroughCapitalIncrease
Namespace Prefix: | abvx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase (Decrease) In Number Of Shares Issued Through Exercise Of Share Warrants + References No definition available. + Details
Name: | abvx_IncreaseDecreaseInNumberOfSharesIssuedThroughExerciseOfShareWarrants
Namespace Prefix: | abvx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Issue Of Equity, Offering Price Per Share + References No definition available. + Details
Name: | abvx_IssueOfEquityOfferingPricePerShare
Namespace Prefix: | abvx_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Convertible Notes Converted + References No definition available. + Details
Name: | abvx_NumberOfConvertibleNotesConverted
Namespace Prefix: | abvx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Free Shares Issued + References No definition available. + Details
Name: | abvx_NumberOfFreeSharesIssued
Namespace Prefix: | abvx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Warrants Exercised + References No definition available. + Details
Name: | abvx_NumberOfWarrantsExercised
Namespace Prefix: | abvx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other Share Warrants, Subscription Price Per Share + References No definition available. + Details
Name: | abvx_OtherShareWarrantsSubscriptionPricePerShare
Namespace Prefix: | abvx_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share Issue Related Cost (Credit) + References No definition available. + Details
Name: | abvx_ShareIssueRelatedCostCredit
Namespace Prefix: | abvx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Share Warrants, Subscription Price Per Share + References No definition available. + Details
Name: | abvx_ShareWarrantsSubscriptionPricePerShare
Namespace Prefix: | abvx_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_ClosingForeignExchangeRate
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfClassesOfShareCapitalLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in the number of ordinary shares issued. [Refer: Ordinary shares [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in equity resulting from the exercise of warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106_d&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase in equity through the issue of equity instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 106 -Subparagraph d -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106_d_iii&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_IssueOfEquity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_NotionalAmount
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2025-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2025-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_47_b&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph B10 -Subparagraph a -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B10_a_iii&doctype=Appendix&subtype=B -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 160 -Subparagraph a -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_160_a_iii&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_79_a_iii&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_ParValuePerShare
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:perShareItemType
Balance Type: | na
Period Type: | instant

X
- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106_d&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_ShareIssueRelatedCost
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=abvx_HeightsConvertibleNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=abvx_KreosClaretFinancingTrancheAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=abvx_AmericanDepositorySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=abvx_KreosABCBSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=abvx_BSA20241AndBSA20242Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abvx_FinancialAgreementAxis=abvx_Kreos1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=abvx_KreosABSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=abvx_KreosBBSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | abvx_FinancialAgreementAxis=abvx_OtherEquityAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |