Arcadis NV

Transaction in Own Shares • Jan 13, 2026

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Arcadis Investor Relations

ARCADIS SHARE BUYBACK PROGRAM 2025

Total Program Size: EUR 175 million Announcement: 1 October 2025, up to 9 months

Summary Progres Program

Total # Shares 4,141,810 Total Consideration € 158,797,681 Average share price € 38.34 Progress % 90.7%

Progress %	90.7%				Total
					Repurchased
				Cumulative	Shares / since			Cumulative Costs /			Weighted avg share price /
as mentioned in press release	Trade date	Value Date	# shares / day	Shares / week	program start	Share price / day	Costs / day	week	€	week -
Week 1	29-Sep	01-Oct	-	-	-	-	-	-	€	-
	30-Sep 01-Oct	02-Oct 03-Oct	- 30,451	- 30,451	- 30,451	- € 46.72	- € 1,422,777	- € 1,422,777	€ 29% €	- 13.39
	02-Oct	06-Oct	32,120	62,571	62,571	€ 47.53	€ 1,526,648	€ 2,949,425	30% €	14.37
	03-Oct	07-Oct	43,661	106,232	106,232	€ 47.41	€ 2,070,003	€ 5,019,428	41% €	19.49 €	47.25
Week 2	06-Oct	08-Oct	27,362	27,362	133,594	€ 48.02	€ 1,314,044	€ 1,314,044	29% €	13.81
	07-Oct	09-Oct	21,710	49,072	155,304	€ 47.93	€ 1,040,504	€ 2,354,547	23% €	10.93
	08-Oct 09-Oct	10-Oct 13-Oct	10,725	59,797 74,278	166,029 180,510	€ 47.19 € 47.80	€ 506,059 € 692,221	€ 2,860,607 € 3,552,827	11% € 15% €	5.32 7.27
	10-Oct	14-Oct	14,481 20,899	95,177	201,409	€ 47.85	€ 1,000,053	€ 4,552,880	22% €	10.51 €	47.84
Week 3	13-Oct 14-Oct	15-Oct 16-Oct	16,029 36,760	16,029 52,789	217,438 254,198	€ 48.10 € 47.51	€ 771,025 € 1,746,537	€ 771,025 € 2,517,563	9% € 20% €	4.17 9.45
	15-Oct	17-Oct	19,972	72,761	274,170	€ 47.72	€ 953,088	€ 3,470,651	11% €	5.16
	16-Oct 17-Oct	20-Oct 21-Oct	58,000	130,761 184,747	332,170 386,156	€ 48.01 € 48.02	€ 2,784,336 € 2,592,359	€ 6,254,987 € 8,847,346	31% € 29% €	15.07 14.03 €	47.89
			53,986
Week 4	20-Oct	22-Oct	5,330	5,330	391,486	€ 47.79	€ 254,733	€ 254,733	9% €	4.12
	21-Oct 22-Oct	23-Oct 24-Oct	13,948 8,655	19,278 27,933	405,434 414,089	€ 48.40 € 49.24	€ 675,090 € 426,145	€ 929,824 € 1,355,968	23% € 14% €	10.91 6.89
	23-Oct	27-Oct	10,579	38,512	424,668	€ 49.02	€ 518,580	€ 1,874,549	17% €	8.38
	24-Oct	28-Oct	23,340	61,852	448,008	€ 50.12	€ 1,169,838	€ 3,044,387	38% €	18.91 €	49.22
Week 5	27-Oct	29-Oct	13,406	13,406	461,414	€ 50.71	€ 679,795	€ 679,795	6% €	2.82
	28-Oct	30-Oct	15,088	28,494	476,502	€ 50.45	€ 761,116	€ 1,440,911	6% €	3.16
	29-Oct	31-Oct	17,196	45,690	493,698	€ 50.86	€ 874,532	€ 2,315,443	7% €	3.63
	30-Oct 31-Oct	03-Nov 04-Nov	93,000 102,271	138,690 240,961	586,698 688,969	€ 43.09 € 41.98	€ 4,007,091 € 4,293,592	€ 6,322,534 € 10,616,126	39% € 42% €	16.63 17.82 €	44.06
Week 6	03-Nov	05-Nov	121,063	121,063	810,032	€ 39.70	€ 4,806,734	€ 4,806,734	21% €	8.51
	04-Nov 05-Nov	06-Nov 07-Nov	122,928 99,233	243,991 343,224	932,960 1,032,193	€ 37.92 € 38.23	€ 4,661,602 € 3,794,084	€ 9,468,336 € 13,262,420	22% € 18% €	8.26 6.72
	06-Nov	10-Nov	97,610	440,834	1,129,803	€ 37.24	€ 3,634,635	€ 16,897,055	17% €	6.44
	07-Nov	11-Nov	123,788	564,622	1,253,591	€ 36.24	€ 4,485,557	€ 21,382,613	22% €	7.94 €	37.87
Week 7	10-Nov	12-Nov	102,580	102,580	1,356,171	€ 36.71	€ 3,765,332	€ 3,765,332	48% €	17.79
	11-Nov	13-Nov	1,000	103,580	1,357,171	€ 36.85	€ 36,853	€ 3,802,185	0% €	0.17
	12-Nov 13-Nov	14-Nov 17-Nov	48,297 29,991	151,877 181,868	1,405,468 1,435,459	€ 37.71 € 37.20	€ 1,821,207 € 1,115,608	€ 5,623,392 € 6,739,000	23% € 14% €	8.60 5.27
	14-Nov	18-Nov	29,782	211,650	1,465,241	€ 36.28	€ 1,080,440	€ 7,819,441	14% €	5.10 €	36.95
Week 8	17-Nov 18-Nov	19-Nov 20-Nov	23,371 50,000	23,371 73,371	1,488,612 1,538,612	€ 36.02 € 35.97	€ 841,739 € 1,798,460	€ 841,739 € 2,640,199	14% € 30% €	5.13 10.96
	19-Nov	21-Nov	29,639	103,010	1,568,251	€ 35.99	€ 1,066,734	€ 3,706,934	18% €	6.50
	20-Nov	24-Nov	30,000	133,010	1,598,251	€ 35.59	€ 1,067,679	€ 4,774,613	18% €	6.51
	21-Nov	25-Nov	31,090	164,100	1,629,341	€ 35.19	€ 1,094,135	€ 5,868,747	19% €	6.67 €	35.76
Week 9	24-Nov	26-Nov	68,090	68,090	1,697,431	€ 36.09	€ 2,457,457	€ 2,457,457	18% €	6.45
	25-Nov 26-Nov	27-Nov 28-Nov	63,659 72,712	131,749 204,461	1,761,090 1,833,802	€ 36.32 € 36.84	€ 2,311,942 € 2,679,066	€ 4,769,399 € 7,448,465	17% € 19% €	6.07 7.03
	27-Nov	01-Dec	91,561	296,022	1,925,363	€ 37.68	€ 3,450,440	€ 10,898,905	24% €	9.05
	28-Nov	02-Dec	85,043	381,065	2,010,406	€ 38.08	€ 3,238,208	€ 14,137,113	22% €	8.50 €	37.10
Week 10	01-Dec	03-Dec	85,622	85,622	2,096,028	€ 37.67	€ 3,225,227	€ 3,225,227	19% €	7.00
	02-Dec	04-Dec	100,787	186,409	2,196,815	€ 37.61	€ 3,790,186	€ 7,015,412	22% €	8.23
	03-Dec	05-Dec	109,866	296,275	2,306,681	€ 37.66	€ 4,137,696	€ 11,153,109	24% €	8.98
	04-Dec 05-Dec	08-Dec 09-Dec	90,402 73,945	386,677 460,622	2,397,083 2,471,028	€ 36.88 € 37.19	€ 3,334,288 € 2,749,793	€ 14,487,397 € 17,237,189	20% € 16% €	7.24 5.97 €	37.42
Week 11	08-Dec	10-Dec	62,869	62,869	2,533,897	€ 36.67	€ 2,305,236	€ 2,305,236	19% €	7.05
	09-Dec 10-Dec	11-Dec 12-Dec	39,140 59,688	102,009 161,697	2,573,037 2,632,725	€ 36.21 € 36.03	€ 1,417,169 € 2,150,750	€ 3,722,406 € 5,873,156	12% € 18% €	4.33 6.57
	11-Dec	15-Dec	72,829	234,526	2,705,554	€ 35.93	€ 2,616,986	€ 8,490,142	22% €	8.00
	12-Dec	16-Dec	92,628	327,154	2,798,182	€ 36.33	€ 3,365,157	€ 11,855,299	28% €	10.29 €	36.24
Week 12	15-Dec	17-Dec	70,641	70,641	2,868,823	€ 36.24	€ 2,559,691	€ 2,559,691	17% €	6.19
	16-Dec	18-Dec	54,486	125,127	2,923,309	€ 36.30	€ 1,977,973	€ 4,537,663	13% €	4.79
	17-Dec 18-Dec	19-Dec 22-Dec	87,374 98,401	212,501 310,902	3,010,683 3,109,084	€ 36.07 € 36.11	€ 3,151,274 € 3,553,703	€ 7,688,938 € 11,242,641	21% € 24% €	7.63 8.60
	19-Dec	23-Dec	102,377	413,279	3,211,461	€ 35.81	€ 3,666,090	€ 14,908,730	25% €	8.87 €	36.07
Week 13	22-Dec	24-Dec	88,945	88,945	3,300,406	€ 35.11	€ 3,123,037	€ 3,123,037	40% €	14.03
	23-Dec	24-Dec	85,233	174,178	3,385,639	€ 35.28	€ 3,007,378	€ 6,130,415	38% €	13.51
	24-Dec	30-Dec	48,451	222,629	3,434,090	€ 35.21	€ 1,705,955	€ 7,836,370	22% €	7.66
	25-Dec 26-Dec	n/a n/a		222,629 222,629	3,434,090 3,434,090			€ 7,836,370 € 7,836,370	0% € 0% €	- - €	35.20
Week 14	29-Dec	31-Dec	71,073	71,073	3,505,163	€ 35.63	€ 2,532,473	€ 2,532,473	29% €	10.28
	30-Dec 31-Dec	02-Jan 05-Jan	50,145 31,069	121,218 152,287	3,555,308 3,586,377	€ 35.79 € 35.72	€ 1,794,860 € 1,109,651	€ 4,327,333 € 5,436,984	20% € 13% €	7.29 4.51
	01-Jan	n/a		152,287	3,586,377		€ 0	€ 5,436,984	0% €	-
	02-Jan	06-Jan	93,950	246,237	3,680,327	€ 35.77	€ 3,361,042	€ 8,798,027	38% €	13.65 €	35.73
Week 15	05-Jan	07-Jan	91,494	91,494	3,771,821	€ 36.29	€ 3,320,610	€ 3,320,610	20% €	7.20
	06-Jan	08-Jan	92,950	184,444	3,864,771	€ 36.65	€ 3,406,655	€ 6,727,265	20% €	7.38
	07-Jan 08-Jan	09-Jan 12-Jan	89,045 92,094	273,489 365,583	3,953,816 4,045,910	€ 36.80 € 36.23	€ 3,276,544 € 3,336,731	€ 10,003,809 € 13,340,540	19% € 20% €	7.10 7.23
	09-Jan	13-Jan	95,900	461,483	4,141,810	€ 36.85	€ 3,533,445	€ 16,873,986	21% €	7.66 €	36.56
TOTAL					4,141,810			€ 158,797,681		€	38.34

1 12/01/2026