[Form 4] NewAmsterdam Pharma Co N.V. Insider Trading Activity

Rhea-AI Filing Summary

NewAmsterdam Pharma Co N.V.’s Chief Financial Officer, Mayur Ian Somaiya, reported stock option exercises and related share sales. On January 20 and 21, 2026, he exercised options to acquire 60,216 and 39,784 ordinary shares at an exercise price of $9.26 per share. On the same dates, he sold several blocks of ordinary shares, including 39,712, 19,604, and 24,362 shares at prices referenced in ranges from about $30.17 to $34.31 per share, as detailed in the footnotes.

After these transactions, Somaiya directly held 58,382 ordinary shares and 662,814 option-based derivative securities. The filing states that at least one sale transaction was carried out under a Rule 10b5-1 trading plan, and notes that the underlying option was granted on November 1, 2023 with vesting over four years, subject to continued service.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Somaiya Mayur Ian

(Last) (First) (Middle)

C/O NEWAMSTERDAM PHARMA COMPANY N.V.

GOOIMEER 2-35

(Street)

NAARDEN P7 1411 DC

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
NewAmsterdam Pharma Co N.V. [ NAMS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
01/20/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Ordinary Shares	01/20/2026		M		60,216	A	$9.26	118,598	D
Ordinary Shares	01/20/2026		S(1)		900	D	$30.64(2)	117,698	D
Ordinary Shares	01/20/2026		S(1)		39,712	D	$31.78(3)	77,986	D
Ordinary Shares	01/20/2026		S(1)		19,604	D	$32.38(4)	58,382	D
Ordinary Shares	01/21/2026		M		39,784	A	$9.26	98,166	D
Ordinary Shares	01/21/2026		S(1)		15,422	D	$33.25(5)	82,744	D
Ordinary Shares	01/21/2026		S(1)		24,362	D	$33.8(6)	58,382	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Option (Right to Buy)	$9.26	01/20/2026		M			60,216	(7)	11/01/2033	Ordinary Shares	60,216	$0.00	702,598	D
Option (Right to Buy)	$9.26	01/21/2026		M			39,784	(7)	11/01/2033	Ordinary Shares	39,784	$0.00	662,814	D

Explanation of Responses:

1. This transaction was effected pursuant to a trading plan adopted by the Reporting Person in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended.

2. These shares were sold in multiple transactions at prices ranging from $30.17 per share to $30.85 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold in each transaction.

3. These shares were sold in multiple transactions at prices ranging from $31.29 per share to $32.28 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold in each transaction.

4. These shares were sold in multiple transactions at prices ranging from $32.29 per share to $32.58 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold in each transaction.

5. These shares were sold in multiple transactions at prices ranging from $32.48 per share to $33.47 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold in each transaction.

6. These shares were sold in multiple transactions at prices ranging from $33.48 per share to $34.31 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold in each transaction.

7. The option was granted on November 1, 2023. 25% of the shares underlying the option vested on the one-year anniversary of the vesting start date, with the remaining shares vesting in equal monthly installments thereafter for three years, subject to the Reporting Person's continued service through each such date.

	/s/ Louise Kooij by Power of Attorney from Mayur Ian Somaiya	01/22/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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