Alten

Transaction in Own Shares • Jan 12, 2026

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PRESS RELEASE

On 12/01/2026, 17:45

Half-year liquidity contract statement for ALTEN

Under the liquidity contract entered into between ALTEN and Kepler Cheuvreux, the following resources appeared on the liquidity account on December 31st 2025:

• 11,981 shares
• € 539,001.32
• Number of executions on buy side on semester: 2,350
• Number of executions on sell side on semester: 2,400
• Traded volume on buy side on semester: 80,466 shares for € 5,638,345.52
• Traded volume on sell side on semester: 81 294 shares for € 5,733,091.83

As a reminder :

• the following resources appeared on the last half year statement on June 30th 2025 on the liquidity account:
• 12,809 shares
• € 442,363.93
• Number of executions on buy side on semester: 3,269
• Number of executions on sell side on semester: 3,215
• Traded volume on buy side on semester: 112,931 shares for € 9,360,254.20
• Traded volume on sell side on semester: 111 765 shares for € 9,331,945.85
• the following resources appeared on the liquidity account when the activity started:
• 9,848 shares
• € 40,881.00

The implementation of this report is carried out in accordance with AMF Decision N°2021-01 of June 22nd 2021 renewing the implementation of liquidity contracts for shares as an accepted market practice.

About ALTEN SA

For all information: www.alten.com/investors Contact for journalists: alten@hopcotch.fr

As the European leader in Engineering and Technology Consulting (ETC), ALTEN carries out design and research projects for the Technical and IT/IS Departments of major industrial, telecom and tertiary clients. The ALTEN share is listed on compartment A of the Euronext Paris market (ISIN FR0000071946) and is part of SBF 120, the IT CAC 50 index, and MIDCAP 100, and is eligible for the Deferred Settlement Service (DSS).

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	Buy Side			Sell Side
	Number of executions	Number of shares	Traded volume in EUR	Number of executions	Number of shares	Traded volume in EUR
Total	2,350	80,466	5,638,345.52	2,400	81,294	5,733,091.6
07/01/2025	31	1,000	74,140.00	35	1,100	81,818.0
07/02/2025	7	350	26,148.50	23	950	71,877.0
07/03/2025	5	150	11,659.50	19	800	62,648.0
07/04/2025	23	800	62,000.00	6	150	11,704.
07/07/2025	13	500	37,835.00	8	150	11,376.
07/08/2025	3	106	8,149.28	28	800	62,000.
07/09/2025	20	750	58,972.50	22	800	63,080.
07/10/2025	14	500	39,465.00	22	600	47,484.
07/11/2025	41	1,194	92,821.56	18	551	43,005.
07/14/2025	32	1,032	78,297.84	28	720	54,892
07/15/2025	11	400	30,308.00	14	480	36,614.
07/16/2025	14	468	34,903.44	4	200	14,960.
07/17/2025	16	600	45,114.00	34	850	64,124.
07/18/2025	18	700	53,816.00	30	1,049	80,982
07/21/2025	26	800	61,912.00	20	897	69,571.
07/22/2025	28	1,000	76,040.00	23	703	53,603.
07/23/2025	36	1,022	78,285.20	35	1,250	95,975.
07/24/2025	31	1,400	108,094.00	48	1,515	117,245
07/25/2025	46	1,598	117,820.54	5	200	14,760
07/28/2025	21	600	44,832.00	34	1,000	74,920
07/29/2025	27	850	62,917.00	16	350	26,173
07/30/2025	28	1,050	76,366.50	21	900	65,574
07/31/2025	13	551	39,638.94	15	451	32,481.
08/01/2025	17	550	38,775.00	-	-
08/04/2025	23	776	53,660.40	14	650	45,032
08/05/2025	4	150	10,350.00	6	200	13,870
08/06/2025	12	474	32,312.58	9	250	17,062
08/07/2025	-	-	-	19	550	37,895
08/08/2025	9	200	14,046.00	23	850	59,967
08/11/2025	23	650	45,760.00	9	200	14,220
08/12/2025	36	765	52,693.20	11	500	34,640
08/13/2025	8	350	24,031.00	19	450	31,023
08/14/2025	13	400	27,460.00	11	350	24,139
08/15/2025	11	250	17,140.00	8	300	20,655
08/18/2025	14	398	27,000.32	1	50	3,440.
08/19/2025	-	-	-	11	388	26,620
08/20/2025	7	400	27,192.00		-
08/21/2025	7	200	13,568.00	2	100	6,850
08/22/2025	3	50	3,417.50	13	400	27,664
08/25/2025	13	450	31,180.50	10	400	27,816
08/26/2025	23	750	50,242.50	2	100	6,778.
08/27/2025	2	50	3,300.00	4	100	6,705
08/28/2025	11	300	20,220.00	11	450	30,465.
08/29/2025	9	350	23,296.00	2	50	3,370.
09/01/2025	13	300	19,755.00	9	250	16,480
09/02/2025	17	550	35,535.50	-	-
09/03/2025	26	800	50,792.00	19	800	50,832
09/04/2025	18	400	25,412.00	12	350	22,260
09/05/2025	13	1,000	64,210.00	28	1,150	74,094
09/08/2025	14	550	35,447.50	23	800	51,800

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	Buy Side				Sell Side
	Number of executions	Number of shares	Traded volume in EUR	Number of executions	Number of shares	Traded volume in EUR
Total	2,350	80,466	5,638,345.52	2,400	81,294	5,733,091.
09/09/2025	19	704	45,971.20	23	600	39,288.
09/10/2025	17	596	38,871.12	33	600	39,312.
09/11/2025	13	550	35,827.00	22	500	32,635.
09/12/2025	18	750	49,117.50	36	850	55,700.
09/15/2025	24	850	55,930.00	26	800	52,904.
09/16/2025	25	796	52,098.20	23	900	59,076.
09/17/2025	18	704	46,097.92	26	750	49,260.
09/18/2025	29	750	49,395.00	19	850	56,159.
09/19/2025	16	587	38,994.41	20	700	46,732
09/22/2025	11	331	21,693.74	16	400	26,456
09/23/2025	10	250	16,890.00	11	500	33,860
09/24/2025	15	550	37,053.50	12	500	33,835
09/25/2025	32	1,082	71,985.46	22	788	52,685
09/26/2025	37	-	•	50	1,962
	8	1,850 350	125,004.50 23,859.50	29	850	135,868
09/29/2025						58,233
09/30/2025	15	550	37,983.00	22	800	55,424
10/01/2025	27	1,051	73,843.26	40	1,200	84,600
10/02/2025	5	211	15,189.89	15	550	39,726
10/03/2025	13	600	43,284.00	20	600	43,422
10/06/2025	29	1,049	73,419.51	-	-
10/07/2025	13	561	39,275.61	18	700	49,210
10/08/2025	16	739	51,892.58	14	550	38,742
10/09/2025	29	1,100	77,990.00	34	1,448	103,141
10/10/2025	41	1,650	116,226.00	32	1,050	74,434
10/13/2025	26	850	59,117.50	25	1,000	69,700
10/14/2025	28	650	44,557.50	-	-
10/15/2025	16	350	24,269.00	26	800	55,608
10/16/2025	20	650	44,993.00	20	700	48,538
10/17/2025	22	600	40,848.00	12	400	27,328
10/20/2025	31	1,150	79,177.50	45	1,400	96,586
10/21/2025	23	826	57,365.70	34	1,200	83,688
10/22/2025	17	624	43,792.32	15	447	31,455
10/23/2025	14	650	45,448.00	14	453	31,791
10/24/2025	10	400	29,120.00	54	2,402	176,691
10/27/2025	17	700	52,997.00	27	850	64,770
10/28/2025	16	550	40,881.50	12	304	22,711
10/29/2025	40	1,350	99,090.00	31	1,071	78,814
10/30/2025	24	750	54,412.50	17	576	42,065
10/31/2025	20	600	42,750.00	16	550	39,297
11/03/2025	27	800	56,688.00	15	550	39,088
11/04/2025	21	550	37,999.50	5	201	13,955
11/05/2025	16	650	44,440.50	14	450	30,798
11/06/2025	31	800	54,024.00	9	420	28,505
11/07/2025	18	425	28,305.00	8	250	16,795
11/10/2025	10	450	30,622.50	27	750	51,202
11/11/2025	14	500	34,075.00	14	500	34,230
11/12/2025	2	100	6,830.00	16	699	48,503
11/13/2025	35	900	62,793.00	20	701	49,070
11/14/2025	22	550	37,521.00	5	250	17,105
11/17/2025	21	700	47,278.00	10	500	33,890

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	Buy Side				Sell Side
	Number of executions	Number of shares	Traded volume in EUR	Number of executions	Number of shares	Traded volume in EUR
Total	2,350	80,466	5,638,345.52	2,400	81,294	5,733,091.8
11/18/2025	12	525	34,429.50	1	50	3,290.0
11/19/2025	10	450	29,178.00	13	300	19,470.0
11/20/2025	22	700	45,241.00	35	650	42,269.5
11/21/2025	38	1,501	95,238.45	39	1,501	95,658.7
11/24/2025	14	520	34,366.80	42	1,249	82,971.0
11/25/2025	14	530	35,298.00	19	650	43,602.0
11/26/2025	22	950	63,982.50	23	770	51,975.0
11/27/2025	15	600	40,212.00	19	700	47,012.0
11/28/2025	19	750	50,377.50	18	700	47,082.0
12/01/2025	18	728	48,433.84	26	759	50,807.4
12/02/2025	13	522	34,900.92	5	201	13,507.2
12/03/2025	11	450	29,979.00	16	749	50,115.5
12/04/2025	5	200	13,586.00	21	641	43,671.3
12/05/2025	12	500	34,665.00	22	699	48,538.5
12/08/2025	18	850	58,709.50	20	578	40,049.6
12/09/2025	34	1,250	85,750.00	32	1,398	96,000.6
12/10/2025	27	1,009	68,884.43	19	800	54,696.0
12/11/2025	1	50	3,435.00	22	874	60,620.6
12/12/2025	2	100	7,105.00	27	999	72,207.7
12/15/2025	12	461	33,579.24	22	800	58,496.0
12/16/2025	9	351	25,623.00	11	450	33,034.5
12/17/2025	37	299	21,713.38	9	359	26,131.6
12/18/2025	-	-	-	26	945	69,684.3
12/19/2025	14	500	37,260.00	13	496	37,289.2
12/22/2025	28	802	58,529.96	1	50	3,720.0
12/23/2025	17	498	35,786.28	3	100	7,208.0
12/24/2025	11	250	17,880.00	6	101	7,256.8
12/29/2025	7	250	17,950.00	25	799	57,671.8
12/30/2025	22	650	47,274.50	25	800	58,376.0
12/31/2025	15	350	25,354.00	2	100	7,233.0