Transaction in Own Shares

2 October 2025

Auto Trader Group plc ("Auto Trader" or the "Company")

Auto Trader Group plc Transaction in Own Shares

Auto Trader Group plc (the "Company") announces that on 2 October 2025 it purchased through Merrill Lynch International the following number of its ordinary shares for Cancellation at an average price of 775.6573 pence per share:

Number of ordinary shares purchased:

373,900

Highest purchase price paid per share:

776.4000p

Lowest purchase price paid per share:

766.4000p

Following the above transaction, the Company has 872,656,995 ordinary shares in issue and holds 5,216,802 ordinary shares in treasury. Therefore, the total number of voting rights in the Company is 867,440,193 which may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, Auto Trader Group plc under the FCA's Disclosure Guidance and Transparency Rules.

In accordance with Article 5(1)(b) of Regulation (EU) No 596/2014 (the Market Abuse Regulation), the schedule below contains detailed information about the purchases made by Merrill Lynch International on behalf of the Company as part of the buyback programme.

Enquiries:

Auto Trader Group plc

Claire Baty, Company Secretary

0345 111 0006

Schedule of Purchases - Individual Transactions

Number of shares purchased

Transaction price (per share)

Time of transaction

Execution venue

287

772.4

09:43:57

XLON

50

769.8

10:04:14

XLON

294

769.8

10:04:14

XLON

104

769

10:25:27

XLON

407

769

10:25:27

XLON

319

767.2

11:01:59

XLON

326

766.8

11:06:45

XLON

390

766.6

11:21:54

XLON

581

767.4

11:52:40

XLON

841

767.6

11:52:40

XLON

534

767.2

11:55:25

XLON

457

766.8

11:55:30

XLON

125

766.8

11:59:06

XLON

343

769.8

12:28:24

XLON

392

769.6

12:28:50

XLON

122

769.2

12:37:30

XLON

313

769.2

12:37:30

XLON

327

769

12:37:30

XLON

289

768.8

12:49:43

XLON

372

768.6

12:50:30

XLON

301

768.4

12:50:31

XLON

316

768.2

12:50:32

XLON

305

767.6

13:01:16

XLON

324

767.4

13:03:14

XLON

671

767

13:03:19

XLON

346

767.4

13:17:52

XLON

391

769.4

13:30:31

XLON

279

768.6

13:35:34

XLON

557

768.6

13:35:34

XLON

836

768.2

13:45:24

XLON

137

767.2

13:48:46

XLON

492

767.2

13:48:46

XLON

313

766.4

13:51:50

XLON

1,071

770

14:20:57

XLON

1,074

769.6

14:30:01

XLON

460

769.2

14:30:26

XLON

577

769

14:30:26

XLON

1,067

769

14:30:26

XLON

745

768.8

14:32:57

XLON

379

769.2

14:35:48

XLON

959

770.6

14:53:49

XLON

305

770.2

14:57:27

XLON

873

770

14:57:27

XLON

386

769.6

14:57:39

XLON

1,218

769.6

14:57:39

XLON

1,251

769

15:01:15

XLON

350

768.4

15:04:07

XLON

492

768.2

15:04:07

XLON

1,011

767.6

15:12:13

XLON

245

769.4

15:21:33

XLON

671

769.4

15:21:33

XLON

1,091

768.8

15:22:50

XLON

381

768.4

15:22:56

XLON

375

768.2

15:29:05

XLON

438

769.8

15:54:05

XLON

577

770

16:00:26

XLON

788

769.8

16:02:15

XLON

2

769.4

16:04:56

XLON

653

769.4

16:05:16

XLON

791

770.2

16:10:58

XLON

424

770.8

16:18:28

XLON

938

770.8

16:19:57

XLON

573

770.8

16:20:25

XLON

291

771

16:23:33

XLON

159

771

16:25:41

XLON

187

771

16:25:41

XLON

193

771

16:25:41

XLON

422

771

16:25:41

XLON

9

771

16:26:21

XLON

348

771

16:26:21

XLON

422

771

16:26:21

XLON

10

771

16:26:54

XLON

91

771

16:27:10

XLON

170

771

16:27:23

XLON

1,652

771.2

16:28:19

XLON

7

771.6

16:29:03

XLON

422

771.6

16:29:03

XLON

422

771.4

16:29:21

XLON

2,448

771.6

16:29:56

XLON

14

776.4

16:35:25

XLON

28

776.4

16:35:25

XLON

97

776.4

16:35:25

XLON

143

776.4

16:35:25

XLON

193

776.4

16:35:25

XLON

213

776.4

16:35:25

XLON

234

776.4

16:35:25

XLON

258

776.4

16:35:25

XLON

324

776.4

16:35:25

XLON

335

776.4

16:35:25

XLON

336

776.4

16:35:25

XLON

368

776.4

16:35:25

XLON

369

776.4

16:35:25

XLON

466

776.4

16:35:25

XLON

558

776.4

16:35:25

XLON

565

776.4

16:35:25

XLON

726

776.4

16:35:25

XLON

798

776.4

16:35:25

XLON

818

776.4

16:35:25

XLON

912

776.4

16:35:25

XLON

1,161

776.4

16:35:25

XLON

1,261

776.4

16:35:25

XLON

1,293

776.4

16:35:25

XLON

1,311

776.4

16:35:25

XLON

1,623

776.4

16:35:25

XLON

1,744

776.4

16:35:25

XLON

2,349

776.4

16:35:25

XLON

2,547

776.4

16:35:25

XLON

2,674

776.4

16:35:25

XLON

6,120

776.4

16:35:25

XLON

6,131

776.4

16:35:25

XLON

6,272

776.4

16:35:25

XLON

6,728

776.4

16:35:25

XLON

6,810

776.4

16:35:25

XLON

9,137

776.4

16:35:25

XLON

9,186

776.4

16:35:25

XLON

10,162

776.4

16:35:25

XLON

15,344

776.4

16:35:25

XLON

66,324

776.4

16:35:25

XLON

70,901

776.4

16:35:25

XLON

97,508

776.4

16:35:25

XLON