United Kingdom Biotechnology & Medical Research

4Basebio PLC (4BB)

Track

Over the last 90 days, 4Basebio PLC has seen one insider buy transaction totaling £9,482.67. The Chief Executive Officer, Dr. Amy Walker, was the sole buyer, acquiring 1,863 shares. This activity occurred against a backdrop of an 11.8% stock price decrease over the same period. No sell transactions were reported.

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Ticker: 4BB Exchange: LSE

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

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Trades

Dr. Amy Walker

Chief Executive Officer

1 purchase — total 100,000 GBP

Buy 21 May 2026

Value £1,163,969.22 | Price 150.51 | Shares 74,056

Dr. Amy Walker

Chief Executive Officer

1 purchase — total 15,531 GBP

Buy 13 Feb 2026

Value £4,391,470.65 | Price 168.02 | Shares 55,251

Mr Hansjörg Plaggemars

Non-executive Director

1 purchase — total 5,850 GBP

Buy 10 Feb 2026

Value £5,850.00 | Price 5.85 | Shares 1,000

Dr. Heikki Lanckriet

Non-executive Director

1 purchase — total 17,275 GBP

Buy 10 Feb 2026

Value £17,274.60 | Price 5.76 | Shares 3,000

Heikki Lanckriet

Chief Executive Officer

1 purchase — total 16,250 GBP

Buy 20 Dec 2021

Value £16,250.00 | Price 6.50 | Shares 2,500

Heikki Lanckriet

Chief Executive Officer

1 purchase — total 19,560 GBP

Buy 13 Dec 2021

Value £19,560.00 | Price 6.52 | Shares 3,000

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
2026-05-22	2026-05-21	B Purchase	3.0 Dr. Amy Walker Chief Executive Officer Officer	74,056 150.51 £1,163,969	74,056	150.51	£1,163,969
2026-02-16	2026-02-13	B Purchase	Dr. Amy Walker Chief Executive Officer Officer	55,251 168.02 £4,391,471	55,251	168.02	£4,391,471
2026-02-11	2026-02-10	B Purchase	Mr Hansjörg Plaggemars Non-executive Director Executive Director	22,046 231.30 £643,400	22,046	231.30	£643,400
2026-02-11	2026-02-10	B Purchase	Dr. Heikki Lanckriet Non-executive Director Executive Director	3,000 5.76 £17,275	3,000	5.76	£17,275
2021-12-20	2021-12-20	B Purchase	Heikki Lanckriet Chief Executive Officer Officer	2,500 6.50 £16,250	2,500	6.50	£16,250
2021-12-13	2021-12-13	B Purchase	Heikki Lanckriet Chief Executive Officer Officer	3,000 6.52 £19,560	3,000	6.52	£19,560