13D Filings
NEWAMSTERDAM PHARMA COMPANY N.V.
NAMS
Amendment
Ownership

6.50%

Total Shares

7,327,937

Issuer CIK

1936258

CUSIP

N62509109

Event Date

Aug 17, 2025

Accepted

Aug 20, 2025, 05:28 PM

Reporting Persons (21)
Joint Filing

This is a joint filing. The reported shares may overlap between reporting persons and should not be summed.

NameType% of ClassAggregateSole VotingShared Voting
James N. Topper
Individual
6.50%7,327,93707,327,937
FHMLS X, L.P.
Partnership
6.50%7,327,93707,327,937
Frazier Life Sciences X, L.P.
Partnership
6.50%7,327,93707,327,937
FHMLS X, L.L.C.
Other
6.50%7,327,93707,327,937
Patrick J. Heron
Individual
6.50%7,327,93707,327,937
FHMLSP, L.L.C.
Other
5.00%5,587,95705,587,957
Frazier Life Sciences Public Fund, L.P.
5.00%5,587,95705,587,957
FHMLSP, L.P.
Partnership
5.00%5,587,95705,587,957
Frazier Lifesciences Sponsor LLC
Other
3.50%3,968,00003,968,000
FHMLSP Overage, L.P.
Partnership
2.60%2,975,75702,975,757
FHMLSP Overage, L.L.C.
Other
2.60%2,975,75702,975,757
Frazier Life Sciences Public Overage Fund, L.P.
Partnership
2.60%2,975,75702,975,757
Frazier Life Sciences XI, L.P.
Partnership
1.00%1,174,81501,174,815
FHMLS XI, L.P.
Partnership
1.00%1,174,81501,174,815
FHMLS XI, L.L.C.
Other
1.00%1,174,81501,174,815
FHMLS XII, L.L.C.
Other
0.10%59,647059,647
FHMLS XII, L.P.
Partnership
0.10%59,647059,647
Frazier Life Sciences XII, L.P.
Partnership
0.10%59,647059,647
Albert Cha
Individual
0.00%000
James Brush
Individual
0.00%000
Daniel Estes
Individual
0.00%000
Disclosure Items (4)

Security Title

Ordinary Shares, nominal value EUR0.12 per share

Issuer Name

NEWAMSTERDAM PHARMA COMPANY N.V.

Issuer Address

Gooimeer 2-35, 1411, Naarden, P7, 1411 DC

Item 3 of the Schedule 13D is hereby amended to incorporate Item 5(c) hereof and the following at the end thereof: The working capital of FLS X, Sponsor, FLSPF, FLSPOF, FLS XI and FLS XII was the source of the funds for their respective purchases reported on Exhibit 10.1. No part of the purchase price for such purchases was represented by funds or other consideration borrowed or otherwise obtained for the purpose of such acquisitions.

Percentage of Class

The information contained in Rows 7, 8, 9, 10, 11, and 13 of each Reporting Person's cover page to this Schedule 13D (including the footnotes thereto) is incorporated by reference into this Item 5. FLS X directly holds 3,026,604 Ordinary Shares and 333,333 warrants ("Warrants") to acquire an equivalent number of Ordinary Shares (collectively, the "FLS X Shares"). FHMLS X, L.P. is the general partner of FLS X and FHMLS X, L.L.C. is the general partner of FHMLS X, L.P. Heron and Topper are the members of FHMLS X, L.L.C. and therefore share voting and investment power over the FLS X Shares. Sponsor directly holds 3,801,000 Ordinary Shares and 167,000 Warrants (the "Sponsor Shares"). FLS X is the sole member of Sponsor. FHMLS X, L.P. is the general partner of FLS X and FHMLS X, L.L.C. is the general partner of FHMLS X, L.P. Heron and Topper are the members of FHMLS X, L.L.C. and therefore share voting and investment power over the Sponsor Shares. FLSPF directly holds 5,587,957 Ordinary Shares (the "FLSPF Shares"). FHMLSP, L.P. is the general partner of FLSPF and the general partner of FHMLSP, L.P. is FHMLSP, L.L.C., which is managed by an investment committee of four that acts by majority vote. Accordingly, no members of such committee are attributed beneficial ownership of the securities directly held by FLSPF, and this Schedule 13D corrects any previous attribution to, and overstatement of beneficial ownership by, such members as reflected in any prior Statements. FLSPOF directly holds 2,975,757 Ordinary Shares (the "FLSPOF Shares"). FHMLSP Overage, L.P. is the general partner of FLSPOF and the general partner of FHMLSP Overage, L.P. is FHMLSP Overage, L.L.C., which is managed by an investment committee of four that acts by majority vote. Accordingly, no members of such committee are attributed beneficial ownership of the securities directly held by FLSPOF, and this Schedule 13D corrects any previous attribution to, and overstatement of beneficial ownership by, such members as reflected in any prior Statements. FLS XI directly holds 1,174,815 Ordinary Shares (the "FLS XI Shares"). FHMLS XI, L.P. is the general partner of FLS XI and the general partner of FHMLS XI, L.P. is FHMLS XI, L.L.C., which is managed by an investment committee of three that acts by majority vote. Accordingly, no members of such committee are attributed beneficial ownership of the securities directly held by FLS XI, and this Schedule 13D corrects any previous attribution to, and overstatement of beneficial ownership by, such members as reflected in any prior Statements. FLS XII directly holds 59,647 Ordinary Shares (the "FLS XII Shares"). FHMLS XII, L.P. is the general partner of FLS XII and the general partner of FHMLS XII, L.P. is FHMLS XII, L.L.C., which is managed by an investment committee of three that acts by majority vote. Accordingly, no members of such committee are attributed beneficial ownership of the securities directly held by FLS XII. Except as specifically stated herein, the filing of this Schedule 13D shall not be construed as an admission that any Reporting Person or any of the foregoing is, for the purposes of Section 13(d) and/or Section 13(g)

Number of Shares

The information contained in Rows 7, 8, 9, 10, 11, and 13 of each Reporting Person's cover page to this Schedule 13D (including the footnotes thereto) is incorporated by reference into this Item 5.

Transactions

Except as set forth on Exhibit 10.1 of this Schedule 13D, none of the Reporting Persons has effected any transactions relating to the Ordinary Shares during the past 60 days.

Shareholders

No other person is known to have the right to receive or the power to direct the receipt of dividends from, or any proceeds from the sale of, the FLS X Shares, the Sponsor Shares, the FLSPF Shares, the FLSPOF Shares, the FLS XI Shares and the FLS XII Shares beneficially owned by any of the Reporting Persons.

Date of 5% Ownership

Not applicable.

Exhibit 10.1 Transactions Relating to the Ordinary Shares of the Issuer During the Past Sixty (60) Days Exhibit 99.1 Joint Filing Agreement

NEWAMSTERDAM PHARMA COMPANY N.V. — Schedule 13D | 13D Filings