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Share-based payments (Tables)
12 Months Ended
Dec. 31, 2024
Disclosure of terms and conditions of share-based payment arrangement [abstract]  
Disclosure of number and weighted average remaining contractual life of founders' warrants, warrants, and free shares outstanding
The number of warrants and options outstanding on December 31, 2024 and their main characteristics, are detailed below:
Founders’ warrants
Pre-2024 founders’ warrant plan
BSPCE
09-2014
BSPCE
2015-1
BSPCE
2015-03
BSPCE
2016 Ordinary
BSPCE
2016 Performance
BSPCE
2017 Ordinary
BSPCE
2017
Type of underlying assetNew sharesNew sharesNew sharesNew sharesNew sharesNew sharesNew shares
Number of founder’s warrants granted97,20071,65053,050126,400129,250117,65080,000
Date of shareholders' resolution approving the plan06/18/201406/18/201406/18/201406/25/201506/25/201506/23/201606/23/2016
Grant date09/16/201402/10/201506/10/201502/02/201602/02/201601/07/201701/07/2017
Contractual expiration date09/16/202402/10/202506/10/202502/02/202602/02/202601/07/202701/07/2027
Grant price— — — — — — — 
Exercise price€18.68 €18.57 €20.28 €14.46 €14.46 €15.93 €15.93 
Number of founders’ warrants as of December 31, 2024
67,75027,35096,81798,10097,05080,000
Number of founders’ warrants exercised333
Including founders’ warrants exercised during the period
Number of founders’ warrants lapsed or cancelled97,2003,90025,70029,25031,15020,600
Including founders’ warrants lapsed or cancelled during the period85,7503501,0501,0501,0501,050
Warrants (BSA)
Pre-2024 warrant plans
BSA
2014
BSA
2015-1
BSA
2015-2 (a)
BSA 2018-2BSA 2019-1BSA 2020BSA 2021 (a)
Type of underlying assetsNew sharesNew sharesNew sharesNew sharesNew sharesNew sharesNew shares
Number of warrants granted14,000 26,000 64,000 5,820 18,000 18,000 48,103 
Date of shareholders' resolution approving the plan06/18/201406/18/201406/18/201405/23/201805/23/201804/11/201911/30/2020
Grant date09/16/201402/10/201506/25/201507/27/201803/29/201903/17/202004/20/2021
Contractual expiration date09/16/202402/10/202506/25/202507/27/202803/29/202903/17/203004/20/2031
Grant price€4.87 €4.87 €5.00 €2.36 €1.15 €0.29 €2.95 
Exercise price€17.67 €17.67 €19.54 €16.10 €11.66 €6.59 €13.47 
Number of warrants as of December 31, 2024
 21,000 64,000 5,820 18,000 18,000 14,431 
Number of warrants exercised— — — — — — — 
Including warrants exercised during the period— — — — — — — 
Number of warrants lapsed or cancelled14,000 5,000 — — — — 33,672 
Including warrants lapsed or cancelled during the period10,000 — — — — — — 
Free shares
Pre-2024 free shares plan vested
Pre-2024 free shares plan not yet vested
AGA 2022
AGA 2023 - P1AGA 2023 - P1
Type of underlying assetsNew sharesNew sharesNew shares
Number of free shares granted300,039427,110439,210
Date of shareholders' resolution approving the plan04/28/202106/27/202306/27/2023
Grant date06/22/202206/27/202306/27/2023
Grant price— — — 
Exercise price— — — 
Number of free shares as of December 31, 2024
392,460423,460
Number of free shares exercised293,523
Including free shares exercised during the period293,523
Number of free shares lapsed or cancelled6,51634,65015,750
Including free shares lapsed or cancelled during the period2538,5009,100
BSPCEBSAOSAAGATotal
Total number of shares underlying grants outstanding as of December 31, 2024
467,067141,2513,512,302815,9204,936,540
BSPCEBSAOSAAGATotal
Total number of shares underlying grants outstanding as of December 31, 2023557,367151,2512,336,1751,127,2964,172,089
BSPCEBSAOSAAGATotal
Total number of shares underlying grants outstanding as of December 31, 2022614,726185,2512,059,523653,7463,513,246
Disclosure of number and weighted average remaining contractual life of share options outstanding
Stock options
Pre-2024 stock option plans
2024 stock options plan
OSA
2016-1 Performance
OSA
2016-2
OSA
2017 Ordinary
OSA
2018
OSA
2019-1
OSA
LLY 2019
OSA
2020
OSA 2021-04OSA 2021-06OSA 2022-06 OrdinaryOSA 2022-06 PerformanceOSA 2023-01 OrdinaryOSA 2024-01 Ordinary
Type of underlying assetNew sharesNew sharesNew sharesNew sharesNew sharesNew sharesNew sharesNew sharesNew sharesNew sharesNew sharesNew sharesNew shares
Number of options granted6,400 4,000 3,500 62,000 37,500 500,000 407,972 571,200 120,000 410,500 170,400 338,860 1,224,780 
Date of shareholders' resolution approving the plan06/25/201506/23/201606/23/201606/14/201705/23/201804/11/201904/11/201911/30/202004/28/202104/28/202111/30/202006/27/202305/23/2024
Grant date02/02/201611/03/201601/07/201703/06/201803/29/201910/24/201903/11/202004/20/202106/21/202106/22/202206/22/202207/20/202305/23/2024
Contractual expiration date02/02/202611/03/202601/07/202703/06/202803/29/202910/24/202903/11/203004/20/203106/21/203106/22/203206/22/203207/20/203305/23/2034
Grant price— — — — — — — — — — — — — 
Exercise price€13.05 €14.26 €14.97 €12.87 €11.08 €6.41 €6.25 €13.74 €12.99 €4.16 €4.16 €5.00 €5.81 
Number of options as of December 31, 2024
400 4,000 500 50,000 24,750 500,000 368,707 384,132 120,000 386,333 133,080 318,860 1,221,540 
Number of options exercised— — — — — — — — — — — — — 
Number of options as of Including options exercised during the period— — — — — — — — — — — — — 
Number of options lapsed or cancelled6,000 — 3,000 12,000 12,750 — 39,265 187,068 — 24,167 37,320 20,000 3,240 
Including options lapsed or cancelled during the period— — — 2,000 1,000 — 9,068 12,068 — 8,167 13,110 — 3,240 
BSPCEBSAOSAAGATotal
Total number of shares underlying grants outstanding as of December 31, 2024
467,067141,2513,512,302815,9204,936,540
BSPCEBSAOSAAGATotal
Total number of shares underlying grants outstanding as of December 31, 2023557,367151,2512,336,1751,127,2964,172,089
BSPCEBSAOSAAGATotal
Total number of shares underlying grants outstanding as of December 31, 2022614,726185,2512,059,523653,7463,513,246
Disclosure of indirect measurement of fair value of goods or services received, other equity instruments granted during period
BSPCE
Share price
(in
euros)
Exercise price
(in euros)
Volatility
Maturity (in years)
Risk-free rateYield
Value of
initial plan
(in thousands
of euros)
Expense for the year ended
2024
(in thousands
of euros)
Expense for the year ended
2023
(in thousands
of euros)
Expense for the year ended
2022
(in thousands
of euros)
BSPCE 09-201418.68 18.68 58 %
 5.5/6/6.5
0.64 %0.00 %965 — — — 
BSPCE 2015-118.57 18.57 
58% - 62% - 61%
5.5/6/6.5
0.39 %0.00 %50 — — — 
BSPCE 2015-320.28 20.28 
61% - 62% - 61%
5.5/6/6.5
0.56 %0.00 %483 — — — 
BSPCE 2016 Ordinary14.46 14.46 
59% - 62% - 60%
5.5/6/6.5
0.32 %0.00 %1,080 — — — 
BSPCE 2016 Performance14.46 14.46 59 %50.19 %0.00 %1,212 — 18 28 
BSPCE 2017 Ordinary15.93 15.93 
58% - 61% - 59%
5.5/6/6.5
0.23 %0.00 %1,000 — — — 
BSPCE 2017 Performance15.93 15.93 59 %50.11 %0.00 %622 — — — 
BSPCE 201715.93 15.93 59 %50.11 %0.00 %627 — — — 
BSPCE 2017 Project15.9315.9359 %50.11 %0.00 %94 — — — 
Total BSPCEn.a.n.a.n.a.n.a.n.a.n.a.n.a. 18 28 

BSA
Share price
(in
euros)
Exercise price
(in
euros)
Volatility
Maturity (in years)
Risk-free rateYield
Value of
initial plan
(in
thousands
of euros)
Expense for the year ended
2024
(in
thousands
of euros)
Expense for the year ended
2023
(in
thousands
of euros)
Expense for the year ended
2022
(in
thousands
of euros)
BSA 201418.68 17.67 57 %50.41 %0.00 %— — — — 
BSA 2015-117.67 17.67 58 %5
0.26% - 0.27%
0.00 %63 — — — 
BSA 2015-2 a19.54 19.54 
58%-58%-57%-58%
5/5.1/5.3/5.4
0.39 %0.00 %16 — — — 
BSA 2015-2 b19.54 19.54 
58% - 60%
4.6 – 9.6
0.25% - 0.91%
0.00 %284 — — — 
BSA 2018-216.10 16.10 38 %4.8
0.7% - 0.1%
0.00 %— — — 
BSA 2019-111.66 11.66 37 %
9.8/9.9
0.16% - 0.50%
0.00 %24 — — — 
BSA 20206.596.5938 %10
(0.13)% -
(0.07)%
0.00 %19 — — — 
BSA 2021 (a)13.47 13.4739.10 %100.27 %0.00 %44 — — — 
Total BSAn.a.n.a.n.a.n.a.n.a.n.a.n.a.   
AGA
Share price
(in
euros)
Exercise price
(in
euros)
Volatility
Maturity (in years)
Risk-free rateYield
Value of
initial plan
(in
thousands
of euros)
Expense for the year ended
2024
(in
thousands
of euros)
Expense for the year ended
2023
(in
thousands
of euros)
Expense for the year ended
2022
(in
thousands
of euros)
AGA 20205.90 0.00 n.a.n.a.
'-0.74%/
-0.69%
0.00 %287 — — 28 
AGA 202113.60 0.00 n.a.n.a.
0.63%
0.59%
0.00 %4,869 — 694 2,283 
AGA 20223.68 0.00 n.a.n.a.
0.95%
1.46%
0.00 %1,092 253 530 286 
AGA 2023 - P14.870n.a.n.a.
3%
3.20%
0.00 %2,071 959 497 — 
AGA 2023 - P24.87 0.00 n.a.n.a.
3%
3.20%
0.00 %2,130 1,040 543 — 
Total AGAn.a.n.a.n.a.n.a.n.a.n.a.n.a.2,252 2,264 2,597 
(in thousands of euros)BSPCEBSAOSAAGATotal
Expense for the year ended December 31, 2024
2,0472,2524,298
(in thousands of euros)BSPCEBSAOSAAGATotal
Expense for the year ended December 31, 2023189412,2643,222
(in thousands of euros)BSPCEBSAOSAAGATotal
Expense for the year ended December 31, 2022285482,5973,173
Disclosure of indirect measurement of fair value of goods or services received, share options granted during period
OSA
Share price
(in
euros)
Exercise price
(in
euros)
Volatility
Maturity (in years)
Risk-free rateYield
Value of
initial plan
(in
thousands
of euros)
Expense for the year ended
2024
(in
thousands
of euros)
Expense for the year ended
2023
(in
thousands
of euros)
Expense for the year ended
2022
(in
thousands
of euros)
OSA 2016 Ordinary13.05 13.05 
59% - 62% - 60%
 5.5 / 6 /6.5
0.32 %0.0 %117 — — — 
OSA 2016 Performance13.05 13.05 59 %50.19 %0.0 %69 — — — 
OSA 2016-214.26 14.26 
58% - 62% - 59%
 5.5 / 6 /6.5
0.04 %0.0 %27 — — — 
OSA 2017 Ordinary15.93 14.97 
58% - 61% - 59%
5.5 / 6 /6.5
0.23 %0.0 %31 — — — 
OSA 2017 Performance15.93 14.97 59 %50.11 %0.0 %35 — — — 
OSA 201812.87 12.87 35 %
5.5 / 6 /6.5
0.00 %0.0 %252 — — — 
OSA 2019-111.08 11.08 
38.1% / 37.4%
6 /6.5
0.103% / 0.149%
0.0 %140 — — (1)
OSA 2019 LLY
6.41 6.41 37 %100.40 %0.0 %252 — — — 
OSA 20206.25 6.25 38 %100.31 %0.0 %939 — 13 101 
OSA 2021-04 O13.60 13.74 
38.9% - 37.8% - 38.3%
 5.5 / 6 /6.5
0.38%/
0.33%/ 0.28%
0.0 %684 34 (28)
OSA 2021-04 P13.60 13.74 39.10 %100.03 %0.0 %1,816 226 216 163 
OSA 2021-06 O12.20 12.99 
39.2% / 37.9% / 38.1%
5.5
6
6.5
0.35%
 0.30%
0.26%
0.0 %246 13 47 107 
OSA 2021-06 P12.20 12.99 39.10 %100.13 %0.0 %212 24 24 24 
OSA 2022-06 O3.68 4.16 
42.06%
41.21%
40.65%
 5.5 / 6/6.5
1.83% / 1.87% / 1.90%
0.0 %580 86 267 178 
OSA 2022-06 P3.68 4.16 40.08 %102.28 %0.0 %80 11 20 
OSA 2023 - 01 O6.75 5.00 
45.07% - 44.11% - 43.41%
5.55 / 6 / 6.5
2.85% / 2.83% / 2.82%
0.0 %1,255 544 321 — 
OSA 2024 - 01 O
5.19 5.81 
53.30% / 51.9% / 50.7%
5.4 / 5.9 / 6.4
3.00% / 3.02% / 3.02%
0.0 %3,107 1,138 — — 
Total OSAn.a.n.a.n.a.n.a.n.a.n.a.n.a.2,047 941 548 
(in thousands of euros)BSPCEBSAOSAAGATotal
Expense for the year ended December 31, 2024
2,0472,2524,298
(in thousands of euros)BSPCEBSAOSAAGATotal
Expense for the year ended December 31, 2023189412,2643,222
(in thousands of euros)BSPCEBSAOSAAGATotal
Expense for the year ended December 31, 2022285482,5973,173