Synthomer PLC (SYNT)

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The most recent insider trading activity at Synthomer PLC occurred on August 7, 2025, with a BUY transaction by Uwe Halder, a Non-Executive Director. Prior to this, significant BUY transactions were observed on October 13, 2023, involving multiple directors and executives, including the CEO and CFO. A notable SELL transaction also took place on October 30, 2023, by Alexander Catto, a Non-Executive Director.

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Ticker: SYNT Exchange: LSE

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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings

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Trades

Uwe Halder

Non-Executive Director

1 purchase — total 15,925 GBP

Buy 7 Aug 2025

Value £3,383,380.45 | Price 279.40 | Shares 97,149

Alexander Catto

Non-Executive Director

1 buy, 1 sell — total 339,909 GBP

Sale 30 Oct 2023

Value £4,127,327.90 | Price 174.16 | Shares 89,311

Buy 30 Oct 2023

Value £3,410,507.48 | Price 191.07 | Shares 9,060

Holly Van Deursen

Non-Executive Director

1 purchase — total 18,500 GBP

Buy 20 Oct 2023

Value £18,500.00 | Price 1.85 | Shares 10,000

Lily Liu

Chief Financial Officer

1 purchase — total 41,000 GBP

Buy 16 Oct 2023

Value £41,000.00 | Price 2.05 | Shares 20,000

Holly A. Van Deursen

Independent Non-executive Director

1 purchase — total 23,640 GBP

Buy 13 Oct 2023

Value £23,640.00 | Price 1.97 | Shares 12,000

Roberto Gualdoni

Independent Non-executive Director

1 purchase — total 39,502 GBP

Buy 13 Oct 2023

Value £39,502.44 | Price 1.97 | Shares 20,052

Lee Hau Hian

Non-executive Director

1 purchase — total 276,257 GBP

Buy 13 Oct 2023

Value £276,257.04 | Price 1.97 | Shares 140,232

Hon Alexander Catto

PCA to the Hon Alexander Catto (PDMR)

4 purchases — total 522,491 GBP

Buy 13 Oct 2023

Value £98,500.00 | Price 1.97 | Shares 50,000

Through CairnSea Investments, a closely affiliated person

Buy 13 Oct 2023

Value £51,816.91 | Price 1.97 | Shares 26,303

Through Schivas Estates Ltd, a closely affiliated person

Buy 13 Oct 2023

Value £313,074.37 | Price 1.97 | Shares 158,921

Through SG Catto Charitable Trust, a closely affiliated person

Buy 13 Oct 2023

Value £59,100.00 | Price 1.97 | Shares 30,000

Through Crescent Trustees, a closely affiliated person

Elizabeth Catto

PCA to the Hon Alexander Catto (PDMR)

1 purchase — total 17,068 GBP

Buy 13 Oct 2023

Value £17,068.08 | Price 1.97 | Shares 8,664

Through Hon Alexander Catto, a closely affiliated person

Alexander Catto

Non-executive Director

1 purchase — total 234,075 GBP

Buy 13 Oct 2023

Value £234,075.40 | Price 1.97 | Shares 118,820

Lily Liu

Chief Financial Officer

1 purchase — total 13,191 GBP

Buy 13 Oct 2023

Value £13,191.12 | Price 1.97 | Shares 6,696

Michael Willome

Chief Executive Officer

1 purchase — total 106,380 GBP

Buy 13 Oct 2023

Value £106,380.00 | Price 1.97 | Shares 54,000

Caroline Johnstone

Chair

1 purchase — total 77,571 GBP

Buy 13 Oct 2023

Value £77,570.72 | Price 1.97 | Shares 39,376

Elizabeth Catto

PCA to the Hon Alexander Catto (PDMR)

1 sale — total 3,435 GBP

Sale 10 Oct 2023

Value £3,434.61 | Price 0.19 | Shares 18,020

Through Hon Alexander Catto, a closely affiliated person

Hon Alexander Catto

PCA to the Hon Alexander Catto (PDMR)

1 buy, 1 sell — total 77,833 GBP

Sale 10 Oct 2023

Value £60,683.42 | Price 0.19 | Shares 318,381

Through SG Catto Charitable Trust, a closely affiliated person

Buy 10 Oct 2023

Value £17,149.62 | Price 0.19 | Shares 89,977

Through Schivas Estates Ltd, a closely affiliated person

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
2025-08-11	2025-08-07	B Purchase	Uwe Halder Non-Executive Director Executive Director	97,149 279.40 £3,383,380	97,149	279.40	£3,383,380
2023-11-03	2023-10-30	S Sale	Alexander Catto Non-Executive Director Executive Director	89,311 174.16 £4,127,328	89,311	174.16	£4,127,328
2023-11-03	2023-10-30	B Purchase	Alexander Catto Non-Executive Director Executive Director	9,060 191.07 £3,410,507	9,060	191.07	£3,410,507
2023-10-23	2023-10-20	B Purchase	1.3 Holly Van Deursen Non-Executive Director Executive Director	10,000 1.85 £18,500	10,000	1.85	£18,500
2023-10-17	2023-10-16	B Purchase	2.1 Lily Liu Chief Financial Officer Officer	20,000 2.05 £41,000	20,000	2.05	£41,000
2023-10-18	2023-10-13	B Purchase	1.3 Holly A. Van Deursen Independent Non-executive Director Non-Executive Director	12,000 1.97 £23,640	12,000	1.97	£23,640
2023-10-18	2023-10-13	B Purchase	Roberto Gualdoni Independent Non-executive Director Non-Executive Director	20,052 1.97 £39,502	20,052	1.97	£39,502
2023-10-18	2023-10-13	B Purchase	Lee Hau Hian Non-executive Director Executive Director	140,232 1.97 £276,257	140,232	1.97	£276,257
2023-10-18	2023-10-13	B Purchase	1.2 Hon Alexander Catto PCA to the Hon Alexander Catto (PDMR) Through CairnSea Investments, a closely affiliated person	50,000 1.97 £98,500	50,000	1.97	£98,500
2023-10-18	2023-10-13	B Purchase	1.2 Hon Alexander Catto PCA to the Hon Alexander Catto (PDMR) Through Schivas Estates Ltd, a closely affiliated person	26,303 1.97 £51,817	26,303	1.97	£51,817
2023-10-18	2023-10-13	B Purchase	1.2 Hon Alexander Catto PCA to the Hon Alexander Catto (PDMR) Through SG Catto Charitable Trust, a closely affiliated person	158,921 1.97 £313,074	158,921	1.97	£313,074
2023-10-18	2023-10-13	B Purchase	1.2 Hon Alexander Catto PCA to the Hon Alexander Catto (PDMR) Through Crescent Trustees, a closely affiliated person	30,000 1.97 £59,100	30,000	1.97	£59,100
2023-10-18	2023-10-13	B Purchase	Elizabeth Catto PCA to the Hon Alexander Catto (PDMR) Through Hon Alexander Catto, a closely affiliated person	8,664 1.97 £17,068	8,664	1.97	£17,068
2023-10-18	2023-10-13	B Purchase	Alexander Catto Non-executive Director Executive Director	118,820 1.97 £234,075	118,820	1.97	£234,075
2023-10-18	2023-10-13	B Purchase	2.1 Lily Liu Chief Financial Officer Officer	6,696 1.97 £13,191	6,696	1.97	£13,191
2023-10-18	2023-10-13	B Purchase	Michael Willome Chief Executive Officer Officer	54,000 1.97 £106,380	54,000	1.97	£106,380
2023-10-18	2023-10-13	B Purchase	3.7 Caroline Johnstone Chair Director	39,376 1.97 £77,571	39,376	1.97	£77,571
2023-10-16	2023-10-10	S Sale	Elizabeth Catto PCA to the Hon Alexander Catto (PDMR) Through Hon Alexander Catto, a closely affiliated person	18,020 0.19 £3,435	18,020	0.19	£3,435
2023-10-16	2023-10-10	S Sale	1.2 Hon Alexander Catto PCA to the Hon Alexander Catto (PDMR) Through SG Catto Charitable Trust, a closely affiliated person	318,381 0.19 £60,683	318,381	0.19	£60,683
2023-10-16	2023-10-10	B Purchase	1.2 Hon Alexander Catto PCA to the Hon Alexander Catto (PDMR) Through Schivas Estates Ltd, a closely affiliated person	89,977 0.19 £17,150	89,977	0.19	£17,150

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