United Kingdom Machinery, Equipment & Components

Diploma PLC (DPLM)

Track

Diploma PLC saw a net buy of 1 transaction totaling 11,912.1 GBP in the last 90 days. Notable recent transactions include multiple buys by Katie Bickerstaffe and Ian El-Mokadem, alongside significant sells by CEO Johnny Thomson in late 2025 and early 2026. The stock has seen a 1.0% price change over 90 days.

Active buying signal · Exceptional

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Active buying signal · Exceptional

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Ticker: DPLM Exchange: LSE

• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings

Insider activity signal detected

20 activity signals detected for Diploma PLC

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Insider trades have triggered activity signals for Diploma PLC. Upgrade to see score, net flow, insiders and the full signal context.

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Company data & Insiders

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Trades

Katie Bickerstaffe

Senior Independent Director

1 purchase — total 11,912 GBP

Buy 20 May 2026

Value £4,515,258.02 | Price 265.89 | Shares 38,074

Ian El-Mokadem

Non-Executive Director

1 purchase — total 29,100 GBP

Buy 20 Mar 2026

Value £4,538,191.18 | Price 206.42 | Shares 65,163

Geraldine Huse

Non-Executive Director

1 purchase — total 31,212 GBP

Buy 19 Mar 2026

Value £31,211.90 | Price 58.34 | Shares 535

Katie Bickerstaffe

Senior Independent Director

1 purchase — total 14,872 GBP

Buy 19 Mar 2026

Value £14,871.75 | Price 59.25 | Shares 251

Johnny Thomson

Chief Executive Officer

1 sale — total 1,700,400 GBP

Sale 16 Jan 2026

Value £1,700,400.00 | Price 56.68 | Shares 30,000

Katie Bickerstaffe

Non-Executive Director

1 purchase — total 19,870 GBP

Buy 14 Jan 2026

Value £19,870.40 | Price 56.45 | Shares 352

Ian El-Mokadem

Non-Executive Director

1 purchase — total 28,075 GBP

Buy 14 Jan 2026

Value £28,075.00 | Price 56.15 | Shares 500

Wilson Ng

Chief Financial Officer

1 purchase — total 22,013 GBP

Buy 19 Dec 2025

Value £22,012.90 | Price 53.69 | Shares 410

Wilson Ng

Acting Chief Financial Officer

1 sale — total 233,815 GBP

Sale 18 Nov 2025

Value £233,815.14 | Price 52.59 | Shares 4,446

Johnny Thomson

Chief Executive Officer

1 sale — total 1,967,234 GBP

Sale 18 Nov 2025

Value £1,967,234.13 | Price 52.59 | Shares 37,407

Geraldine Huse

Non-Executive Director

1 purchase — total 29,978 GBP

Buy 19 Mar 2025

Value £29,977.50 | Price 39.97 | Shares 750

Chris Davies

Chief Financial Officer

1 purchase — total 167,648 GBP

Buy 20 Dec 2024

Value £167,647.60 | Price 42.80 | Shares 3,917

Katie Bickerstaffe

Non-Executive Director

2 purchases — total 30,755 GBP

Buy 19 Nov 2024

Value £9,890.64 | Price 43.38 | Shares 228

Buy 19 Nov 2024

Value £20,863.98 | Price 43.74 | Shares 477

Chris Davies

Chief Financial Officer

1 sale — total 164,067 GBP

Sale 19 Nov 2024

Value £164,067.12 | Price 45.36 | Shares 3,617

Johnny Thomson

Chief Executive Officer

1 sale — total 1,215,376 GBP

Sale 19 Nov 2024

Value £1,215,375.84 | Price 45.36 | Shares 26,794

Chris Davies

Chief Financial Officer

1 purchase — total 135,599 GBP

Buy 15 Dec 2023

Value £135,599.04 | Price 35.46 | Shares 3,824

Johnny Thomson

Chief Executive Officer

1 sale — total 737,000 GBP

Sale 4 Dec 2023

Value £737,000.00 | Price 33.50 | Shares 22,000

J Thomson

Chief Executive Officer

1 sale — total 1,061,772 GBP

Sale 20 Nov 2023

Value £1,061,771.60 | Price 30.20 | Shares 35,158

J Thomson

Chief Executive Officer

1 sale — total 1,124,956 GBP

Sale 21 Nov 2022

Value £1,124,956.00 | Price 28.00 | Shares 40,177

Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other

Notification date	Transaction date	B/S Transaction type	Insider and/or position	Nb. shares Price Value	Number of shares	Price	Value
2026-05-21	2026-05-20	B Purchase	3.1 Katie Bickerstaffe Senior Independent Director Non-Executive Director	38,074 265.89 £4,515,258	38,074	265.89	£4,515,258
2026-03-23	2026-03-20	B Purchase	3.7 Ian El-Mokadem Non-Executive Director Executive Director	65,163 206.42 £4,538,191	65,163	206.42	£4,538,191
2026-03-23	2026-03-19	B Purchase	3.4 Geraldine Huse Non-Executive Director Executive Director	42,686 23.06 £3,450,991	42,686	23.06	£3,450,991
2026-03-23	2026-03-19	B Purchase	3.1 Katie Bickerstaffe Senior Independent Director Non-Executive Director	251 59.25 £14,872	251	59.25	£14,872
2026-01-16	2026-01-16	S Sale	3.3 Johnny Thomson Chief Executive Officer Officer	30,000 56.68 £1,700,400	30,000	56.68	£1,700,400
2026-01-15	2026-01-14	B Purchase	3.1 Katie Bickerstaffe Non-Executive Director Executive Director	352 56.45 £19,870	352	56.45	£19,870
2026-01-15	2026-01-14	B Purchase	3.7 Ian El-Mokadem Non-Executive Director Executive Director	500 56.15 £28,075	500	56.15	£28,075
2025-12-22	2025-12-19	B Purchase	1.7 Wilson Ng Chief Financial Officer Officer	410 53.69 £22,013	410	53.69	£22,013
2025-11-19	2025-11-18	S Sale	1.7 Wilson Ng Acting Chief Financial Officer Officer	4,446 52.59 £233,815	4,446	52.59	£233,815
2025-11-19	2025-11-18	S Sale	3.3 Johnny Thomson Chief Executive Officer Officer	37,407 52.59 £1,967,234	37,407	52.59	£1,967,234
2025-11-19	2025-03-19	B Purchase	3.4 Geraldine Huse Non-Executive Director Executive Director	750 39.97 £29,978	750	39.97	£29,978
2024-12-23	2024-12-20	B Purchase	3.5 Chris Davies Chief Financial Officer Officer	3,917 42.80 £167,648	3,917	42.80	£167,648
2024-11-20	2024-11-19	B Purchase	3.1 Katie Bickerstaffe Non-Executive Director Executive Director	228 43.38 £9,891	228	43.38	£9,891
2024-11-20	2024-11-19	B Purchase	3.1 Katie Bickerstaffe Non-Executive Director Executive Director	477 43.74 £20,864	477	43.74	£20,864
2024-11-20	2024-11-19	S Sale	3.5 Chris Davies Chief Financial Officer Officer	3,617 45.36 £164,067	3,617	45.36	£164,067
2024-11-20	2024-11-19	S Sale	3.3 Johnny Thomson Chief Executive Officer Officer	26,794 45.36 £1,215,376	26,794	45.36	£1,215,376
2023-12-18	2023-12-15	B Purchase	3.5 Chris Davies Chief Financial Officer Officer	3,824 35.46 £135,599	3,824	35.46	£135,599
2023-12-05	2023-12-04	S Sale	3.3 Johnny Thomson Chief Executive Officer Officer	22,000 33.50 £737,000	22,000	33.50	£737,000
2023-11-21	2023-11-20	S Sale	2.0 J Thomson Chief Executive Officer Officer	35,158 30.20 £1,061,772	35,158	30.20	£1,061,772
2022-11-22	2022-11-21	S Sale	2.0 J Thomson Chief Executive Officer Officer	40,177 28.00 £1,124,956	40,177	28.00	£1,124,956