NewAmsterdam Pharma Company N.V. NAMSW NASDAQ

NASDAQ Capital Marke • Healthcare • Biotechnology • NL • USD

There have been 50 recent insider transactions recorded for NewAmsterdam Pharma Company N.V. (NAMSW), including 21 buys and 27 sells. Total insider buying was valued at $37.88M and total insider selling at $40.16M.

Notable insiders with recent activity include Lange Louis G, Kastelein Johannes Jacob Pieter, Davidson Michael H.. Insider transactions can provide insights into how company leadership views the stock's valuation and future prospects.

Insider Transactions — NAMSW

Date	Name	Role	Transaction	Shares	Avg. Price	Value	Shares Owned
2026-03-11	Lange Louis G	Director	Informative Sell	446	$31.23	$13.93K	10,360
2026-03-09	Kastelein Johannes Jacob Pieter	Chief Scientific Officer	Informative Sell	101,409	$30.29	$3.07M	69,302
2026-03-09	Lange Louis G	Director	Option Exercise (ITM)	44,619	$11.50	$513.12K	-
2026-03-06	Kastelein Johannes Jacob Pieter	Chief Scientific Officer	Informative Sell	94,124	$30.32	$2.85M	69,302
2026-03-06	Lange Louis G	Director	Informative Sell	28,186	$29.41	$828.95K	-
2026-03-05	Kastelein Johannes Jacob Pieter	Chief Scientific Officer	Informative Sell	104,467	$30.30	$3.17M	69,302
2026-03-02	Davidson Michael H.	Chief Executive Officer	Informative Sell	443,707	$33.25	$14.75M	174,144
2026-02-26	Davidson Michael H.	Chief Executive Officer	Informative Sell	17,924	$34.44	$617.3K	174,144
2026-02-25	Davidson Michael H.	Chief Executive Officer	Informative Sell	1,300	$36.68	$47.68K	459,859
2026-02-24	Davidson Michael H.	Chief Executive Officer	Informative Sell	3,161	$36.46	$115.25K	459,859
2026-02-20	Kastelein Johannes Jacob Pieter	Chief Scientific Officer	Informative Sell	30,789	$35.46	$1.09M	53,500
2026-01-28	Kooij Louise Frederika	Chief Accounting Officer	Informative Sell	32,612	$31.80	$1.04M	24,353
2026-01-27	Kooij Louise Frederika	Chief Accounting Officer	Informative Sell	39,816	$32.62	$1.3M	24,353
2026-01-26	Kooij Louise Frederika	Chief Accounting Officer	Informative Sell	309	$33.45	$10.34K	24,353
2026-01-23	Kooij Louise Frederika	Chief Accounting Officer	Informative Sell	12,767	$34.37	$438.8K	24,353
2026-01-21	Somaiya Mayur Ian	Chief Financial Officer	Informative Sell	24,362	$33.80	$823.44K	58,382
2026-01-20	Somaiya Mayur Ian	Chief Financial Officer	Informative Sell	19,604	$32.38	$634.78K	58,382
2026-01-07	Somaiya Mayur Ian	Chief Financial Officer	RSU Award	25,500	-	-	58,382
2026-01-07	Kastelein Johannes Jacob Pieter	Chief Scientific Officer	RSU Award	25,500	-	-	98,981
2026-01-07	Kooij Louise Frederika	Chief Accounting Officer	RSU Award	12,000	-	-	24,353
2026-01-07	Lange Louis G	Director	RSU Award	3,400	-	-	10,360
2026-01-07	Lewis William	Director	RSU Award	3,400	-	-	10,360
2026-01-07	Smither John W	Director	RSU Award	3,400	-	-	10,360
2026-01-07	Davidson Michael H.	Chief Executive Officer	RSU Award	364,000	$35.45	$12.9M	364,000
2026-01-07	Gulfo Adele M.	Director	RSU Award	3,400	-	-	14,260
2026-01-07	Mckenna Mark C.	Director	RSU Award	3,400	-	-	10,360
2026-01-07	Van Der Kamp Hilde Johanna	Director	RSU Award	3,400	-	-	10,360
2026-01-05	Somaiya Mayur Ian	Chief Financial Officer	Informative Sell	5,118	$33.25	$170.17K	32,882
2026-01-05	Kastelein Johannes Jacob Pieter	Chief Scientific Officer	Informative Sell	6,000	$33.25	$199.5K	73,481
2026-01-05	Kooij Louise Frederika	Chief Accounting Officer	Informative Sell	2,647	$33.25	$88.01K	12,353
2025-12-26	Kooij Louise Frederika	Chief Accounting Officer	Informative Sell	43,872	$35.30	$1.55M	15,000
2025-12-24	Kooij Louise Frederika	Chief Accounting Officer	Informative Sell	26,011	$35.68	$928.07K	15,000
2025-12-23	Kooij Louise Frederika	Chief Accounting Officer	Informative Sell	75,117	$36.21	$2.72M	15,000
2025-09-15	Topper James N	Director	Informative Buy	660	$23.70	$15.64K	3,028,524
2025-09-09	Kooij Louise Frederika	Chief Accounting Officer	Informative Sell	96,896	$26.11	$2.53M	15,000
2025-09-08	Topper James N	Director	Informative Buy	1,260	$24.99	$31.49K	3,027,864
2025-09-03	Kooij Louise Frederika	Chief Accounting Officer	Informative Sell	18,073	$25.09	$453.45K	15,000
2025-09-02	Kooij Louise Frederika	Chief Accounting Officer	Option Exercise (Sell)	18,073	-	-	-
2025-08-25	Kooij Louise Frederika	Chief Accounting Officer	Informative Sell	8,269	$24.86	$205.57K	15,000
2024-01-04	Lewis William	Officer	Unknown	-	-	-	-
2024-01-04	Lewis William	Director	RSU Award	100,000	$12.01	$1.2M	100,000
2024-01-01	Forgrowth Nap B.v.	10 Percent Owner	Unknown	-	-	-	11,831,461
2024-01-01	Lange Louis G	Director	RSU Award	10,000	$11.17	$111.7K	10,000
2024-01-01	Smither John W	Director	RSU Award	10,000	$11.17	$111.7K	10,000
2024-01-01	Davidson Michael H.	Chief Executive Officer	RSU Award	1,039,939	$11.17	$11.62M	1,039,939
2024-01-01	Kling Douglas F	Chief Operating Officer	RSU Award	323,771	$11.17	$3.62M	323,771
2024-01-01	Somaiya Mayur Ian	Chief Financial Officer	RSU Award	80,000	$11.17	$893.6K	80,000
2024-01-01	Kastelein Johannes Jacob Pieter	Chief Scientific Officer	RSU Award	500,000	$11.17	$5.59M	500,000
2024-01-01	Van Der Kamp Hilde Johanna	Director	RSU Award	10,000	$11.17	$111.7K	10,000
2024-01-01	Kooij Louise Frederika	Chief Accounting Officer	RSU Award	150,494	$11.17	$1.68M	150,494

■ Informative Buy/Sell — open market transaction (most significant) ■ Uninformative Buy — award, option exercise, conversion ■ Uninformative Sell — tax withholding, award vest sale ■ Neutral — gift, trust, expiry