Arcadis NV

Transaction in Own Shares • Dec 23, 2025

ARCADIS SHARE BUYBACK PROGRAM 2025

Total Program Size: EUR 175 million

Announcement: 1 October 2025, up to 9 months

Summary Progres Program

Total # Shares		3,211,461
Total Consideration	€ 125,289,298
Average share price	€	39.01

Progress % 71.6% Trade date Value Date # shares / day Cumulative Shares / week Total Repurchased Shares / since program start Share price / day Costs / day Cumulative Costs / week Weighted avg share price / week as mentioned in press release € - Week 1 29-Sep 01-Oct - - - - - - € - 30-Sep 02-Oct - - - - - - € - 01-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 10-Oct 10,725 59,797 166,029 € 47.19 € 506,059 € 2,860,607 11% € 5.32 09-Oct 13-Oct 14,481 74,278 180,510 € 47.80 € 692,221 € 3,552,827 15% € 7.27 10-Oct 14-Oct 20,899 95,177 201,409 € 47.85 € 1,000,053 € 4,552,880 22% € 10.51 € 47.84 Week 3 13-Oct 15-Oct 16,029 16,029 217,438 € 48.10 € 771,025 € 771,025 9% € 4.17 14-Oct 16-Oct 36,760 52,789 254,198 € 47.51 € 1,746,537 € 2,517,563 20% € 9.45 15-Oct 17-Oct 19,972 72,761 274,170 € 47.72 € 953,088 € 3,470,651 11% € 5.16 16-Oct 20-Oct 58,000 130,761 332,170 € 48.01 € 2,784,336 € 6,254,987 31% € 15.07 17-Oct 21-Oct 53,986 184,747 386,156 € 48.02 € 2,592,359 € 8,847,346 29% € 14.03 € 47.89 Week 4 20-Oct 22-Oct 5,330 5,330 391,486 € 47.79 € 254,733 € 254,733 9% € 4.12 21-Oct 23-Oct 13,948 19,278 405,434 € 48.40 € 675,090 € 929,824 23% € 10.91 22-Oct 24-Oct 8,655 27,933 414,089 € 49.24 € 426,145 € 1,355,968 14% € 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 03-Nov 93,000 138,690 586,698 € 43.09 € 4,007,091 € 6,322,534 39% € 16.63 31-Oct 04-Nov 102,271 240,961 688,969 € 41.98 € 4,293,592 € 10,616,126 42% € 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 06-Nov 122,928 243,991 932,960 € 37.92 € 4,661,602 € 9,468,336 22% € 8.26 05-Nov 07-Nov 99,233 343,224 1,032,193 € 38.23 € 3,794,084 € 13,262,420 18% € 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 14-Nov 48,297 151,877 1,405,468 € 37.71 € 1,821,207 € 5,623,392 23% € 8.60 13-Nov 17-Nov 29,991 181,868 1,435,459 € 37.20 € 1,115,608 € 6,739,000 14% € 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 19-Nov 23,371 23,371 1,488,612 € 36.02 € 841,739 € 841,739 14% € 5.13 18-Nov 20-Nov 50,000 73,371 1,538,612 € 35.97 € 1,798,460 € 2,640,199 30% € 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 27-Nov 63,659 131,749 1,761,090 € 36.32 € 2,311,942 € 4,769,399 17% € 6.07 26-Nov 28-Nov 72,712 204,461 1,833,802 € 36.84 € 2,679,066 € 7,448,465 19% € 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 08-Dec 90,402 386,677 2,397,083 € 36.88 € 3,334,288 € 14,487,397 20% € 7.24 05-Dec 09-Dec 73,945 460,622 2,471,028 € 37.19 € 2,749,793 € 17,237,189 16% € 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 11-Dec 39,140 102,009 2,573,037 € 36.21 € 1,417,169 € 3,722,406 12% € 4.33 10-Dec 12-Dec 59,688 161,697 2,632,725 € 36.03 € 2,150,750 € 5,873,156 18% € 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 19-Dec 87,374 212,501 3,010,683 € 36.07 € 3,151,274 € 7,688,938 21% € 7.63 18-Dec 22-Dec 98,401 310,902 3,109,084 € 36.11 € 3,553,703 € 11,242,641 24% € 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

TOTAL 3,211,461 125,289,298 € 39.01