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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2025
Property, plant and equipment [abstract]  
Disclosure of reconciliation of property, plant and equipment The following tables present changes in property, plant and equipment including the right of use of assets (or “ROU”) as of
December 31, 2023, 2024 and 2025:
(amounts in thousands of euros)
BUILDINGS
EQUIPMENT
FURNITURE
AND
COMPUTER
EQUIPMENT
TOTAL
OF WHICH
ROU
GROSS VALUES
AS OF
JANUARY 1, 2023
1,618
436
346
2,400
1,561
Acquisition
350
103
161
614
350
Disposal
(622)
(27)
—
(649)
(649)
AS OF
DECEMBER 31, 2023
1,346
513
507
2,366
1,262
Acquisition
2,578
—
292
2,870
2,217
Disposal
(1,110)
—
(119)
(1,229)
(975)
Effect of the change in foreign currency exchange rates
4
—
17
22
22
AS OF
DECEMBER 31, 2024
2,818
513
698
4,029
2,526
Acquisition
436
—
123
559
424
Disposal
—
(49)
(203)
(252)
(34)
Effect of the change in foreign currency exchange rates
(50)
—
(12)
(62)
(50)
AS OF
DECEMBER 31, 2025
3,204
463
607
4,274
2,865
(amounts in thousands of euros)
BUILDINGS
EQUIPMENT
FURNITURE
AND
COMPUTER
EQUIPMENT
TOTAL
OF WHICH
ROU
DEPRECIATION
AS OF
JANUARY 1, 2023
(259)
(378)
(171)
(808)
(290)
Increase
(578)
(36)
(94)
(707)
(498)
Disposal
—
27
—
27
27
AS OF
DECEMBER 31, 2023
(837)
(387)
(265)
(1,488)
(761)
Increase
(886)
(32)
(171)
(1,089)
(788)
Disposal
1,111
—
104
1,215
975
AS OF
DECEMBER 31, 2024
(613)
(419)
(332)
(1,363)
(575)
Increase
(903)
(35)
(158)
(1,095)
(797)
Disposal
—
49
203
252
53
Effect of the change in foreign currency exchange rates
17
—
5
22
17
AS OF
DECEMBER 31, 2025
(1,498)
(404)
(281)
(2,184)
(1,302)
(amounts in thousands of euros)
BUILDINGS
EQUIPMENT
FURNITURE
AND
COMPUTER
EQUIPMENT
TOTAL
OF WHICH
ROU
NET BOOK VALUES
AS OF
JANUARY 1, 2023
1,359
—
59
—
175
—
1,592
—
1,270
AS OF
DECEMBER 31, 2023
509
—
126
—
242
—
878
—
501
AS OF
DECEMBER 31, 2024
2,205
—
94
—
366
—
2,666
—
1,950
AS OF
DECEMBER 31, 2025
1,706
—
59
—
325
—
2,090
—
1,563