
| 1. | Details of the person discharging managerial responsibilities / person closely associated | |||||||||||||
| a) | Name | Jan van de Winkel | ||||||||||||
| 2. | Reason for the notification | |||||||||||||
| a) | Position/status | President & Chief Executive Officer | ||||||||||||
| b) | Initial notification/Amendment | Initial notification | ||||||||||||
| 3. | Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor | |||||||||||||
| a) | Name | Genmab A/S | ||||||||||||
| b) | LEI-code | 529900MTJPDPE4MHJ122 | ||||||||||||
| 4. | Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted | |||||||||||||
| a) | Description of the financial instrument, type of instrument Identification code | Share DK0010272202 | ||||||||||||
| b) | Nature of the transaction | Acquisition due to vesting of restricted stock units | ||||||||||||
| c) | Price(s) and volume(s) | Price(s) | Volume(s) | |||||||||||
DKK 1,758.50 | 8,525 | |||||||||||||
| d) | Aggregated information - Aggregated volume - Price | 8,525 shares DKK 1,758.50 | ||||||||||||
| e) | Date of the transaction | 2026-04-01 | ||||||||||||
| f) | Place of the transaction | Outside the market | ||||||||||||
| Genmab A/S Carl Jacobsens Vej 30 2500 Valby, Denmark | Tel: +45 7020 2728 www.genmab.com | Company Announcement no. 21 Page 1/7 CVR no. 2102 3884 LEI Code 529900MTJPDPE4MHJ122 | ||||||

| 1. | Details of the person discharging managerial responsibilities / person closely associated | |||||||||||||
| a) | Name | Anthony Pagano | ||||||||||||
| 2. | Reason for the notification | |||||||||||||
| a) | Position/status | Executive Vice President & Chief Financial Officer | ||||||||||||
| b) | Initial notification/Amendment | Initial notification | ||||||||||||
| 3. | Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor | |||||||||||||
| a) | Name | Genmab A/S | ||||||||||||
| b) | LEI-code | 529900MTJPDPE4MHJ122 | ||||||||||||
| 4. | Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted | |||||||||||||
| a) | Description of the financial instrument, type of instrument Identification code | Share DK0010272202 | ||||||||||||
| b) | Nature of the transaction | Acquisition due to vesting of restricted stock units | ||||||||||||
| c) | Price(s) and volume(s) | Price(s) | Volume(s) | |||||||||||
1,758.50 | 4,206 | |||||||||||||
| d) | Aggregated information - Aggregated volume - Price | 4,206 shares DKK 1,758.50 | ||||||||||||
| e) | Date of the transaction | 2026-04-01 | ||||||||||||
| f) | Place of the transaction | Outside the market | ||||||||||||
| Genmab A/S Carl Jacobsens Vej 30 2500 Valby, Denmark | Tel: +45 7020 2728 www.genmab.com | Company Announcement no. 21 Page 2/7 CVR no. 2102 3884 LEI Code 529900MTJPDPE4MHJ122 | ||||||

| 1. | Details of the person discharging managerial responsibilities / person closely associated | |||||||||||||
| a) | Name | Martine van Vugt | ||||||||||||
| 2. | Reason for the notification | |||||||||||||
| a) | Position/status | Executive Vice President & Chief Strategy Officer | ||||||||||||
| b) | Initial notification/Amendment | Initial notification | ||||||||||||
| 3. | Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor | |||||||||||||
| a) | Name | Genmab A/S | ||||||||||||
| b) | LEI-code | 529900MTJPDPE4MHJ122 | ||||||||||||
| 4. | Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted | |||||||||||||
| a) | Description of the financial instrument, type of instrument Identification code | Share DK0010272202 | ||||||||||||
| b) | Nature of the transaction | Acquisition due to vesting of restricted stock units | ||||||||||||
| c) | Price(s) and volume(s) | Price(s) | Volume(s) | |||||||||||
1,758.50 | 439 | |||||||||||||
| d) | Aggregated information - Aggregated volume - Price | 439 shares DKK 1,758.50 | ||||||||||||
| e) | Date of the transaction | 2026-04-01 | ||||||||||||
| f) | Place of the transaction | Outside the market | ||||||||||||
| Genmab A/S Carl Jacobsens Vej 30 2500 Valby, Denmark | Tel: +45 7020 2728 www.genmab.com | Company Announcement no. 21 Page 3/7 CVR no. 2102 3884 LEI Code 529900MTJPDPE4MHJ122 | ||||||

| 1. | Details of the person discharging managerial responsibilities / person closely associated | |||||||||||||
| a) | Name | Tahamtan Ahmadi | ||||||||||||
| 2. | Reason for the notification | |||||||||||||
| a) | Position/status | Executive Vice President & Chief Medical Officer | ||||||||||||
| b) | Initial notification/Amendment | Initial notification | ||||||||||||
| 3. | Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor | |||||||||||||
| a) | Name | Genmab A/S | ||||||||||||
| b) | LEI-code | 529900MTJPDPE4MHJ122 | ||||||||||||
| 4. | Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted | |||||||||||||
| a) | Description of the financial instrument, type of instrument Identification code | Share DK0010272202 | ||||||||||||
| b) | Nature of the transaction | Acquisition due to vesting of restricted stock units | ||||||||||||
| c) | Price(s) and volume(s) | Price(s) | Volume(s) | |||||||||||
1,758.50 | 5,186 | |||||||||||||
| d) | Aggregated information - Aggregated volume - Price | 5,186 shares DKK 1,758.50 | ||||||||||||
| e) | Date of the transaction | 2026-04-01 | ||||||||||||
| f) | Place of the transaction | Outside the market | ||||||||||||
| Genmab A/S Carl Jacobsens Vej 30 2500 Valby, Denmark | Tel: +45 7020 2728 www.genmab.com | Company Announcement no. 21 Page 4/7 CVR no. 2102 3884 LEI Code 529900MTJPDPE4MHJ122 | ||||||

| 1. | Details of the person discharging managerial responsibilities / person closely associated | |||||||||||||
| a) | Name | Christopher Cozic | ||||||||||||
| 2. | Reason for the notification | |||||||||||||
| a) | Position/status | Executive Vice President & Chief People Officer | ||||||||||||
| b) | Initial notification/Amendment | Initial notification | ||||||||||||
| 3. | Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor | |||||||||||||
| a) | Name | Genmab A/S | ||||||||||||
| b) | LEI-code | 529900MTJPDPE4MHJ122 | ||||||||||||
| 4. | Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted | |||||||||||||
| a) | Description of the financial instrument, type of instrument Identification code | Share DK0010272202 | ||||||||||||
| b) | Nature of the transaction | Acquisition due to vesting of restricted stock units | ||||||||||||
| c) | Price(s) and volume(s) | Price(s) | Volume(s) | |||||||||||
1,758.50 | 2,825 | |||||||||||||
| d) | Aggregated information - Aggregated volume - Price | 2,825 shares DKK 1,758.50 | ||||||||||||
| e) | Date of the transaction | 2026-04-01 | ||||||||||||
| f) | Place of the transaction | Outside the market | ||||||||||||
| Genmab A/S Carl Jacobsens Vej 30 2500 Valby, Denmark | Tel: +45 7020 2728 www.genmab.com | Company Announcement no. 21 Page 5/7 CVR no. 2102 3884 LEI Code 529900MTJPDPE4MHJ122 | ||||||

| 1. | Details of the person discharging managerial responsibilities / person closely associated | |||||||||||||
| a) | Name | Judith Klimovsky | ||||||||||||
| 2. | Reason for the notification | |||||||||||||
| a) | Position/status | Executive Vice President & Chief Development Officer | ||||||||||||
| b) | Initial notification/Amendment | Initial notification | ||||||||||||
| 3. | Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor | |||||||||||||
| a) | Name | Genmab A/S | ||||||||||||
| b) | LEI-code | 529900MTJPDPE4MHJ122 | ||||||||||||
| 4. | Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted | |||||||||||||
| a) | Description of the financial instrument, type of instrument Identification code | Share DK0010272202 | ||||||||||||
| b) | Nature of the transaction | Acquisition due to vesting of restricted stock units | ||||||||||||
| c) | Price(s) and volume(s) | Price(s) | Volume(s) | |||||||||||
1,758.50 | 4,744 | |||||||||||||
| d) | Aggregated information - Aggregated volume - Price | 4,744 shares DKK 1,758.50 | ||||||||||||
| e) | Date of the transaction | 2026-04-01 | ||||||||||||
| f) | Place of the transaction | Outside the market | ||||||||||||
| Genmab A/S Carl Jacobsens Vej 30 2500 Valby, Denmark | Tel: +45 7020 2728 www.genmab.com | Company Announcement no. 21 Page 6/7 CVR no. 2102 3884 LEI Code 529900MTJPDPE4MHJ122 | ||||||

| Genmab A/S Carl Jacobsens Vej 30 2500 Valby, Denmark | Tel: +45 7020 2728 www.genmab.com | Company Announcement no. 21 Page 7/7 CVR no. 2102 3884 LEI Code 529900MTJPDPE4MHJ122 | ||||||