NewAmsterdam Pharma Co N.V. (NAMS) · Insider trading

What NewAmsterdam Pharma's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.

Bought, 12 months

$226,500

1 insider, 1 trade

Sold, 12 months

$63.25M

6 insiders, 71% under a plan

Net, 12 months

−$63.03M

bought less sold

Latest filing

2026-10-02

filings read to 2026-10-19

Bought and sold at the market, by month

Two years. Purchases above the line, sales below, in dollars.

Bought Sold Largest month: $28.70M

Who traded, two years

Insider	Bought	Sold	Trades	Last trade	Holds after
Forbion Capital Fund IV Cooperatief U.a.10% owner	–	$30.02M	25	2024-12-30	–
Davidson Michael H.Director, Chief Executive Officer	$226,500	$25.33M	11	2026-09-14	792,923
Kooij Louise FrederikaChief Accounting Officer	–	$24.34M	21	2026-07-20	59,153
Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	–	$17.99M	11	2026-09-30	–
Kling Douglas FChief Operating Officer	–	$4.03M	19	2025-07-16	44,000
Somaiya Mayur IanChief Financial Officer	–	$3.43M	10	2026-01-21	82,744
Lange Louis GDirector	–	$2.19M	3	2026-03-11	10,806
Topper James NDirector	$404,974	–	8	2025-09-15	–
Smither John WDirector	–	$40,512	1	2026-09-04	8,760

Open-market purchases and sales

Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.

Date	Insider	Trade	Shares	Price	Value	Holds after	Filing
2026-09-30	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Saleplanindirect	50,246	25.03	$1.26M	69,302	Form 4
2026-09-14	Davidson Michael H.Director, Chief Executive Officer	Buy	10,000	22.65	$226,500	792,923	Form 4
2026-09-04	Smither John WDirector	Sale	1,600	25.32	$40,512	8,760	Form 4
2026-08-24	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Saleplanindirect	125,000	26.91	$3.36M	69,302	Form 4
2026-07-20	Kooij Louise FrederikaChief Accounting Officer	Saleplan	70,200	29.96	$2.10M	59,153	Form 4
2026-07-20	Kooij Louise FrederikaChief Accounting Officer	Saleplan	31,885	31.05	$990,029	27,268	Form 4
2026-07-20	Kooij Louise FrederikaChief Accounting Officer	Saleplan	2,915	31.71	$92,435	24,353	Form 4
2026-06-22	Kooij Louise FrederikaChief Accounting Officer	Saleplan	39,700	30.20	$1.20M	24,653	Form 4
2026-06-22	Kooij Louise FrederikaChief Accounting Officer	Saleplan	300	30.73	$9,219	24,353	Form 4
2026-05-26	Kooij Louise FrederikaChief Accounting Officer	Saleplan	65,000	35.69	$2.32M	24,353	Form 4
2026-03-11	Lange Louis GDirector	Sale	44,173	30.41	$1.34M	10,806	Form 4
2026-03-11	Lange Louis GDirector	Sale	446	31.23	$13,929	10,360	Form 4
2026-03-09	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Saleplanindirect	101,409	30.29	$3.07M	69,302	Form 4
2026-03-06	Lange Louis GDirector	Saleindirect	28,186	29.41	$828,950	0	Form 4
2026-03-06	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Saleplanindirect	94,124	30.32	$2.85M	69,302	Form 4
2026-03-05	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Saleplanindirect	104,467	30.30	$3.17M	69,302	Form 4
2026-03-02	Davidson Michael H.Director, Chief Executive Officer	Sale	443,707	33.25	$14.75M	174,144	Form 4
2026-02-26	Davidson Michael H.Director, Chief Executive Officer	Saleplan	165,408	33.63	$5.56M	477,783	Form 4
2026-02-26	Davidson Michael H.Director, Chief Executive Officer	Saleplan	17,924	34.44	$617,303	174,144	Form 4
2026-02-25	Davidson Michael H.Director, Chief Executive Officer	Saleplan	46,517	35.11	$1.63M	471,595	Form 4
2026-02-25	Davidson Michael H.Director, Chief Executive Officer	Saleplan	10,436	35.96	$375,279	461,159	Form 4
2026-02-25	Davidson Michael H.Director, Chief Executive Officer	Saleplan	1,300	36.68	$47,684	459,859	Form 4
2026-02-24	Davidson Michael H.Director, Chief Executive Officer	Saleplan	61,547	36.13	$2.22M	463,020	Form 4
2026-02-24	Davidson Michael H.Director, Chief Executive Officer	Saleplan	3,161	36.46	$115,250	459,859	Form 4
2026-02-20	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Sale	14,692	35.00	$514,220	84,289	Form 4
2026-02-20	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Sale	30,789	35.46	$1.09M	53,500	Form 4
2026-01-28	Kooij Louise FrederikaChief Accounting Officer	Saleplan	32,612	31.80	$1.04M	24,353	Form 4
2026-01-27	Kooij Louise FrederikaChief Accounting Officer	Saleplan	39,816	32.62	$1.30M	24,353	Form 4
2026-01-26	Kooij Louise FrederikaChief Accounting Officer	Saleplan	34,091	32.77	$1.12M	24,662	Form 4
2026-01-26	Kooij Louise FrederikaChief Accounting Officer	Saleplan	309	33.45	$10,336	24,353	Form 4
2026-01-23	Kooij Louise FrederikaChief Accounting Officer	Saleplan	25,405	33.44	$849,543	37,120	Form 4
2026-01-23	Kooij Louise FrederikaChief Accounting Officer	Saleplan	12,767	34.37	$438,802	24,353	Form 4
2026-01-21	Somaiya Mayur IanChief Financial Officer	Saleplan	15,422	33.25	$512,782	82,744	Form 4
2026-01-21	Somaiya Mayur IanChief Financial Officer	Saleplan	24,362	33.80	$823,436	58,382	Form 4
2026-01-20	Somaiya Mayur IanChief Financial Officer	Saleplan	900	30.64	$27,576	117,698	Form 4
2026-01-20	Somaiya Mayur IanChief Financial Officer	Saleplan	39,712	31.78	$1.26M	77,986	Form 4
2026-01-20	Somaiya Mayur IanChief Financial Officer	Saleplan	19,604	32.38	$634,778	58,382	Form 4
2026-01-07	Davidson Michael H.Director, Chief Executive Officer	Saleplan	11,582	–	–	378,859	Form 4
2026-01-05	Somaiya Mayur IanChief Financial Officer	Saleplan	5,118	33.25	$170,174	32,882	Form 4
2026-01-05	Kooij Louise FrederikaChief Accounting Officer	Saleplan	2,647	33.25	$88,013	12,353	Form 4

69 more

2026-01-05	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Saleplan	6,000	33.25	$199,500	73,481	Form 4
2025-12-26	Kooij Louise FrederikaChief Accounting Officer	Saleplan	43,872	35.30	$1.55M	15,000	Form 4
2025-12-24	Kooij Louise FrederikaChief Accounting Officer	Saleplan	26,011	35.68	$928,072	15,000	Form 4
2025-12-23	Kooij Louise FrederikaChief Accounting Officer	Saleplan	75,117	36.21	$2.72M	15,000	Form 4
2025-09-15	Topper James NDirector	Buyindirect	660	23.70	$15,642	3,028,524	Form 4
2025-09-09	Kooij Louise FrederikaChief Accounting Officer	Sale	53,104	25.31	$1.34M	111,896	Form 4
2025-09-09	Kooij Louise FrederikaChief Accounting Officer	Sale	96,896	26.11	$2.53M	15,000	Form 4
2025-09-08	Topper James NDirector	Buyindirect	1,260	24.99	$31,487	3,027,864	Form 4
2025-09-03	Kooij Louise FrederikaChief Accounting Officer	Sale	18,073	25.09	$453,452	15,000	Form 4
2025-08-25	Kooij Louise FrederikaChief Accounting Officer	Sale	8,269	24.86	$205,567	15,000	Form 4
2025-08-22	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Saleindirect	42,342	25.08	$1.06M	76,960	Form 4
2025-08-22	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Saleindirect	7,658	25.49	$195,202	69,302	Form 4
2025-08-21	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Saleindirect	50,000	24.29	$1.21M	119,302	Form 4
2025-08-11	Topper James NDirector	Buyindirect	471	23.98	$11,295	3,026,604	Form 4
2025-07-16	Kling Douglas FChief Operating Officer	Saleplan	51,043	21.10	$1.08M	44,000	Form 4
2025-07-15	Kling Douglas FChief Operating Officer	Saleplan	44,025	21.38	$941,254	47,544	Form 4
2025-07-15	Kling Douglas FChief Operating Officer	Saleplan	3,544	22.12	$78,393	44,000	Form 4
2025-06-25	Topper James NDirector	Buyindirect	1,260	18.26	$23,008	3,026,133	Form 4
2025-06-24	Topper James NDirector	Buyindirect	2,520	18.43	$46,444	3,024,873	Form 4
2025-06-16	Kling Douglas FChief Operating Officer	Saleplan	81,891	19.19	$1.57M	62,109	Form 4
2025-06-16	Kling Douglas FChief Operating Officer	Saleplan	18,109	19.75	$357,653	44,000	Form 4
2025-06-16	Topper James NDirector	Buyindirect	8,584	19.50	$167,388	3,022,153	Form 4
2025-05-15	Kling Douglas FChief Operating Officer	Saleplan	100,000	–	–	44,000	Form 4
2025-04-15	Kling Douglas FChief Operating Officer	Saleplan	99,090	–	–	44,910	Form 4
2025-04-15	Kling Douglas FChief Operating Officer	Saleplan	910	–	–	44,000	Form 4
2025-03-26	Davidson Michael H.Director, Chief Executive Officer	Sale	12,258	–	–	390,441	Form 4
2025-03-26	Kling Douglas FChief Operating Officer	Sale	16,539	–	–	44,000	Form 4
2025-03-26	Topper James NDirector	Buyindirect	1,135	22.49	$25,526	3,013,569	Form 4
2025-03-17	Kling Douglas FChief Operating Officer	Saleplan	100,000	–	–	44,000	Form 4
2025-03-04	Topper James NDirector	Buyindirect	4,005	21.02	$84,185	3,012,434	Form 4
2025-03-04	Kooij Louise FrederikaChief Accounting Officer	Sale	150,000	20.37	$3.06M	15,000	Form 4
2025-02-19	Kling Douglas FChief Operating Officer	Saleplan	9,218	–	–	44,000	Form 4
2025-02-18	Kling Douglas FChief Operating Officer	Saleplan	90,782	–	–	44,000	Form 4
2025-01-30	Kling Douglas FChief Operating Officer	Saleplan	4,664	–	–	52,914	Form 4
2025-01-30	Kling Douglas FChief Operating Officer	Saleplan	8,914	–	–	44,000	Form 4
2025-01-29	Kling Douglas FChief Operating Officer	Saleplan	56,863	–	–	44,000	Form 4
2025-01-28	Kling Douglas FChief Operating Officer	Saleplan	20,237	–	–	49,148	Form 4
2025-01-28	Kling Douglas FChief Operating Officer	Saleplan	5,148	–	–	44,000	Form 4
2025-01-28	Somaiya Mayur IanChief Financial Officer	Saleplan	11,495	–	–	41,405	Form 4
2025-01-28	Somaiya Mayur IanChief Financial Officer	Saleplan	3,405	–	–	38,000	Form 4
2025-01-27	Kling Douglas FChief Operating Officer	Saleplan	80,359	–	–	67,815	Form 4
2025-01-27	Kling Douglas FChief Operating Officer	Saleplan	23,815	–	–	44,000	Form 4
2025-01-27	Somaiya Mayur IanChief Financial Officer	Saleplan	33,679	–	–	51,304	Form 4
2025-01-27	Somaiya Mayur IanChief Financial Officer	Saleplan	13,304	–	–	38,000	Form 4
2024-12-30	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	29,846	25.54	$762,267	10,656,172	Form 4
2024-12-27	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	41,472	25.95	$1.08M	10,686,018	Form 4
2024-12-26	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	33,438	26.01	$869,722	10,727,490	Form 4
2024-12-24	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	16,164	25.66	$414,768	10,760,928	Form 4
2024-12-23	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	25,132	25.49	$640,615	10,777,092	Form 4
2024-12-20	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	44,143	25.53	$1.13M	10,807,853	Form 4
2024-12-20	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	5,629	26.13	$147,086	10,802,224	Form 4
2024-12-19	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	56,506	25.45	$1.44M	10,851,996	Form 4
2024-12-18	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	54,518	25.72	$1.40M	10,954,712	Form 4
2024-12-18	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	46,210	26.55	$1.23M	10,908,502	Form 4
2024-12-17	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	66,648	25.60	$1.71M	11,056,966	Form 4
2024-12-17	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	47,736	26.45	$1.26M	11,009,230	Form 4
2024-12-16	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	1,096	25.00	$27,400	11,123,614	Form 4
2024-12-13	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	25,751	25.01	$644,033	11,124,710	Form 4
2024-12-12	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	140,048	25.25	$3.54M	11,176,424	Form 4
2024-12-12	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	25,963	26.18	$679,711	11,150,461	Form 4
2024-12-11	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	130,561	25.26	$3.30M	11,339,949	Form 4
2024-12-11	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	18,583	26.41	$490,777	11,321,366	Form 4
2024-12-11	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	4,894	27.11	$132,676	11,316,472	Form 4
2024-12-10	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	259,739	25.22	$6.55M	11,519,021	Form 4
2024-12-10	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	48,511	26.15	$1.27M	11,470,510	Form 4
2024-11-18	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	33,273	25.08	$834,487	11,778,760	Form 4
2024-11-15	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	8,530	25.02	$213,421	11,812,033	Form 4
2024-11-14	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	9,832	25.01	$245,898	11,820,563	Form 4
2024-11-13	Forbion Capital Fund IV Cooperatief U.a.10% ownerwith Forbion Growth Opportunities Fund I Cooperatief U.a., Forbion Growth Management B.v., Forbion IV Management B.v., ForGrowth Nap B.v.	Saleplanindirect	1,066	25.00	$26,650	11,830,395	Form 4

Grants, exercises and other transactions

Pay, tax and paperwork rather than a choice to trade at the market price. Two years.

53 × option exercise27 × grant or award1 × option exercise

Show them

Date	Insider	What	Shares	Price	Holds after	Filing
2026-09-30	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Option exercise M	+50,246	–	119,548	Form 4
2026-09-01	Gunning Robert WilliamVice President, Controller	Grant or award A	+3,200	–	3,200	Form 4
2026-08-24	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Option exercise M	+125,000	–	194,302	Form 4
2026-07-20	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+25,000	11.90	49,353	Form 4
2026-07-20	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+80,000	11.17	129,353	Form 4
2026-06-22	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+25,000	10.90	49,353	Form 4
2026-06-22	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+15,000	11.90	64,353	Form 4
2026-05-26	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+60,000	10.00	84,353	Form 4
2026-05-26	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+5,000	10.90	89,353	Form 4
2026-03-09	Lange Louis GDirector	Option exercise X	+44,619	11.50	54,979	Form 4
2026-03-09	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Option exercise M	+101,409	–	170,711	Form 4
2026-03-06	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Option exercise M	+94,124	–	163,426	Form 4
2026-03-05	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Option exercise M	+104,467	–	173,769	Form 4
2026-03-02	Davidson Michael H.Director, Chief Executive Officer	Option exercise M	+443,707	–	617,851	Form 4
2026-02-26	Davidson Michael H.Director, Chief Executive Officer	Option exercise M	+183,332	–	643,191	Form 4
2026-02-25	Davidson Michael H.Director, Chief Executive Officer	Option exercise M	+58,253	–	518,112	Form 4
2026-02-24	Davidson Michael H.Director, Chief Executive Officer	Option exercise M	+64,708	–	524,567	Form 4
2026-01-28	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+32,612	10.90	56,965	Form 4
2026-01-27	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+39,816	10.90	64,169	Form 4
2026-01-26	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+34,400	10.90	58,753	Form 4
2026-01-23	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+38,172	10.90	62,525	Form 4
2026-01-21	Somaiya Mayur IanChief Financial Officer	Option exercise M	+39,784	9.26	98,166	Form 4
2026-01-20	Somaiya Mayur IanChief Financial Officer	Option exercise M	+60,216	9.26	118,598	Form 4
2026-01-07	Lange Louis GDirector	Grant or award A	+3,400	–	10,360	Form 4
2026-01-07	McKenna Mark C.Director	Grant or award A	+3,400	–	10,360	Form 4
2026-01-07	Smither John WDirector	Grant or award A	+3,400	–	10,360	Form 4
2026-01-07	Lewis WilliamDirector	Grant or award A	+3,400	–	10,360	Form 4
2026-01-07	Davidson Michael H.Director, Chief Executive Officer	Grant or award A	+81,000	–	459,859	Form 4
2026-01-07	Gulfo Adele M.Director	Grant or award A	+3,400	–	14,260	Form 4
2026-01-07	van der Kamp Hilde JohannaDirector	Grant or award A	+3,400	–	10,360	Form 4
2026-01-07	Somaiya Mayur IanChief Financial Officer	Grant or award A	+25,500	–	58,382	Form 4
2026-01-07	Kooij Louise FrederikaChief Accounting Officer	Grant or award A	+12,000	–	24,353	Form 4
2026-01-07	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Grant or award A	+25,500	–	98,981	Form 4
2025-12-26	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+38,872	10.00	53,872	Form 4
2025-12-26	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+5,000	10.90	58,872	Form 4
2025-12-24	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+26,011	10.00	41,011	Form 4
2025-12-23	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+75,117	10.00	90,117	Form 4
2025-09-09	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+150,000	10.00	165,000	Form 4
2025-09-02	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+18,073	–	33,073	Form 4
2025-07-16	Kling Douglas FChief Operating Officer	Option exercise M	+51,043	10.90	95,043	Form 4
2025-07-15	Kling Douglas FChief Operating Officer	Option exercise M	+47,569	10.90	91,569	Form 4
2025-06-16	Kling Douglas FChief Operating Officer	Option exercise M	+78,101	10.00	122,101	Form 4
2025-06-16	Kling Douglas FChief Operating Officer	Option exercise M	+21,899	10.90	144,000	Form 4
2025-06-01	Lange Louis GDirector	Option exercise M	+68	–	28,186	Form 4
2025-06-01	Marino Michael F IIISee Remarks	Grant or award A	+55,000	–	55,000	Form 4
2025-05-15	Kling Douglas FChief Operating Officer	Option exercise M	+100,000	10.00	144,000	Form 4
2025-05-01	Lange Louis GDirector	Option exercise M	+69	–	28,118	Form 4
2025-04-15	Gulfo Adele M.Director	Grant or award A	+10,860	–	10,860	Form 4
2025-04-15	Kling Douglas FChief Operating Officer	Option exercise M	+100,000	10.00	144,000	Form 4
2025-04-14	Lange Louis GDirector	Option exercise M	+69	–	28,049	Form 4
2025-03-26	Davidson Michael H.Director, Chief Executive Officer	Grant or award A	+30,992	–	364,305	Form 4
2025-03-26	Davidson Michael H.Director, Chief Executive Officer	Option exercise M	+38,394	–	402,699	Form 4
2025-03-26	Kling Douglas FChief Operating Officer	Option exercise M	+16,539	–	60,539	Form 4
2025-03-26	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Grant or award A	+19,302	–	169,302	Form 4
2025-03-26	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Option exercise M	+45,481	–	79,481	Form 4
2025-03-26	Lange Louis GDirector	Option exercise M	+3,102	–	10,062	Form 4
2025-03-26	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+8,269	–	23,269	Form 4
2025-03-24	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Option exercise M	+150,000	–	150,000	Form 4
2025-03-17	Kling Douglas FChief Operating Officer	Option exercise M	+88,112	–	132,112	Form 4
2025-03-17	Kling Douglas FChief Operating Officer	Option exercise M	+11,888	10.00	144,000	Form 4
2025-03-04	Kooij Louise FrederikaChief Accounting Officer	Option exercise M	+150,000	–	165,000	Form 4
2025-02-19	Kling Douglas FChief Operating Officer	Option exercise M	+9,218	–	53,218	Form 4
2025-02-18	Kling Douglas FChief Operating Officer	Option exercise M	+90,782	–	134,782	Form 4
2025-01-30	Kling Douglas FChief Operating Officer	Option exercise M	+13,578	–	57,578	Form 4
2025-01-29	Kling Douglas FChief Operating Officer	Option exercise M	+56,863	–	100,863	Form 4
2025-01-28	Kling Douglas FChief Operating Officer	Option exercise M	+25,385	–	69,385	Form 4
2025-01-28	Somaiya Mayur IanChief Financial Officer	Option exercise M	+14,900	9.26	52,900	Form 4
2025-01-27	Kling Douglas FChief Operating Officer	Option exercise M	+104,174	–	148,174	Form 4
2025-01-27	Somaiya Mayur IanChief Financial Officer	Option exercise M	+46,983	9.26	84,983	Form 4
2025-01-07	Lange Louis GDirector	Grant or award A	+6,960	–	6,960	Form 4
2025-01-07	van der Kamp Hilde JohannaDirector	Grant or award A	+6,960	–	6,960	Form 4
2025-01-07	Lewis WilliamDirector	Grant or award A	+6,960	–	6,960	Form 4
2025-01-07	McKenna Mark C.Director	Grant or award A	+6,960	–	6,960	Form 4
2025-01-07	Smither John WDirector	Grant or award A	+6,960	–	6,960	Form 4
2025-01-07	Somaiya Mayur IanChief Financial Officer	Grant or award A	+38,000	–	38,000	Form 4
2025-01-07	Kling Douglas FChief Operating Officer	Grant or award A	+44,000	–	44,000	Form 4
2025-01-07	Jones William A JrChief Commercial Officer	Grant or award A	+43,000	–	43,000	Form 4
2025-01-07	Audet Juliette BerangereChief Business Officer	Grant or award A	+14,000	–	15,104	Form 4
2025-01-07	Kastelein Johannes Jacob PieterDirector, Chief Scientific Officer	Grant or award A	+34,000	–	34,000	Form 4
2025-01-07	Davidson Michael H.Director, Chief Executive Officer	Grant or award A	+123,529	–	123,529	Form 4
2025-01-07	Kooij Louise FrederikaChief Accounting Officer	Grant or award A	+15,000	–	15,000	Form 4

How to read it

Buy, sale: Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
Plan: A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
Holds after: The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
Value: Shares times the price the form reports, which is often an average over several fills on the day.

Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.

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