Company · Ownership research

NewAmsterdam Pharma Co N.V. NAMS

CIK 0001936258 · CUSIP N62509109

Insider tradingInitial holdingsInstitutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP N62509109 (NAMS), not CUSIP N62509909 (NAMS), CUSIP N62509959 (NAMS), and does not merge CUSIPs.

This page lists the top 20 of 171 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	Frazier Life Sciences Management, L.P. CIK 1892134 · View history	$542.37M 16,943,774 shares	13.96%	0(0.0%)Unchanged	SEC filing ↗ May 15, 2026	▾
02	Capital World Investors CIK 1422849 · View history	$355.60M 11,109,034 shares	0.05%	+1.13M(+11.3%)Added	SEC filing ↗ May 13, 2026	▾
03	RA CAPITAL MANAGEMENT, L.P. CIK 1346824 · View history	$305.70M 9,550,191 shares	3.24%	0(0.0%)Unchanged	SEC filing ↗ May 15, 2026	▾
04	FCPM III SERVICES B.V. CIK 2013410 · View history	$294.46M 9,198,900 shares	40.77%	0(0.0%)Unchanged	SEC filing ↗ May 15, 2026	▾
05	FMR LLC CIK 315066 · View history	$280.59M 8,765,811 shares	0.01%	+2.35M(+36.7%)Added	SEC filing ↗ May 15, 2026	▾
06	Bain Capital Life Sciences Investors, LLC CIK 1703031 · View history	$233.88M 7,306,566 shares	21.09%	0(0.0%)Unchanged	SEC filing ↗ May 15, 2026	▾
07	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$163.76M 5,115,818 shares	0.03%	+82.64K(+1.6%)Added	SEC filing ↗ May 15, 2026	▾
08	DEERFIELD MANAGEMENT COMPANY, L.P. CIK 1009258 · View history	$136.52M 4,264,789 shares	1.61%	+100.00K(+2.4%)Added	SEC filing ↗ May 15, 2026	▾
09	VIKING GLOBAL INVESTORS LP CIK 1103804 · View history	$134.56M 4,203,567 shares	0.38%	0(0.0%)Unchanged	SEC filing ↗ May 15, 2026	▾
10	Duquesne Family Office LLC CIK 1536411 · View history	$98.28M 3,070,146 shares	3.35%	0(0.0%)Unchanged	SEC filing ↗ May 15, 2026	▾
11	Polar Capital Holdings Plc CIK 1837309 · View history	$90.64M 2,831,607 shares	0.40%	+55.38K(+2.0%)Added	SEC filing ↗ May 15, 2026	▾
12	JENNISON ASSOCIATES LLC CIK 53417 · View history	$88.04M 2,750,403 shares	0.06%	-738.82K(-21.2%)Reduced	SEC filing ↗ May 6, 2026	▾
13	Medicxi Ventures Management (Jersey) Ltd CIK 1715579 · View history	$85.60M 2,674,182 shares	8.72%	-195.38K(-6.8%)Reduced	SEC filing ↗ Apr 21, 2026	▾
14	JANUS HENDERSON GROUP PLC CIK 1274173 · Amended · View history	$72.25M 2,258,984 shares	0.03%	-82.74K(-3.5%)Reduced	SEC filing ↗ May 18, 2026	▾
15	WESTFIELD CAPITAL MANAGEMENT CO LP CIK 1177719 · View history	$70.52M 2,202,913 shares	0.30%	+2.20MNew	SEC filing ↗ May 11, 2026	▾
16	MAVERICK CAPITAL LTD CIK 934639 · View history	$69.99M 2,186,402 shares	0.81%	+292.18K(+15.4%)Added	SEC filing ↗ May 15, 2026	▾
17	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$62.30M 1,946,374 shares	0.01%	+220.71K(+12.8%)Added	SEC filing ↗ May 15, 2026	▾
18	Capital International Investors CIK 1562230 · View history	$46.13M 1,441,131 shares	0.01%	-621.40K(-30.1%)Reduced	SEC filing ↗ May 13, 2026	▾
19	ALLIANCEBERNSTEIN L.P. CIK 1109448 · View history	$42.07M 1,199,325 shares	0.01%	-101.55K(-7.8%)Reduced	SEC filing ↗ May 15, 2026	▾
20	ADAGE CAPITAL PARTNERS GP, L.L.C. CIK 1165408 · View history	$35.42M 1,106,631 shares	0.05%	-300.00K(-21.3%)Reduced	SEC filing ↗ May 15, 2026	▾

Showing 20 / 171 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

171

Cancelled or null records excluded

Disclosed shares

123,651,391

Not deduplicated across managers

Disclosed value

$3.96B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

NewAmsterdam Pharma Co N.V. · Q1 2026

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.