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NewAmsterdam Pharma (NAMS) CAO exercises options and sells 65,000 shares

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

NewAmsterdam Pharma’s Chief Accounting Officer Louise Frederika Kooij reported an exercise-and-sell transaction in Ordinary Shares. On May 26, 2026, she exercised options to acquire a total of 65,000 shares at exercise prices of $10.00 and $10.90 per share.

That same day she completed an open-market sale of 65,000 Ordinary Shares at a weighted average price of $35.69, with individual trades ranging from $35.12 to $36.09 per share. After these transactions she directly holds 24,353 Ordinary Shares, including 22,000 shares subject to restricted stock unit awards that continue to vest over time.

Positive

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Insider Kooij Louise Frederika
Role Chief Accounting Officer
Sold 65,000 shs ($2.32M)
Type Security Shares Price Value
Exercise Option (right to buy) 60,000 $0.00 --
Exercise Option (right to buy) 5,000 $0.00 --
Exercise Ordinary Shares 60,000 $10.00 $600K
Exercise Ordinary Shares 5,000 $10.90 $55K
Sale Ordinary Shares 65,000 $35.69 $2.32M
Holdings After Transaction: Option (right to buy) — 80,015 shares (Direct, null); Ordinary Shares — 84,353 shares (Direct, null)
Footnotes (1)
  1. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $35.12 to $36.09 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. Includes 22,000 ordinary shares subject to restricted stock unit awards that remain subject to vesting. The option was granted on November 22, 2022. The shares underlying the option vest in equal monthly installments over four years, with the first 1/48th of such shares vesting on December 1, 2022 and the remaining installments vesting on each one-month anniversary of the grant date, subject to the Reporting Person's continued service through each such date. The option was granted on January 1, 2023. 25% of the shares underlying the option vest on the one-year anniversary of 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.
Shares sold 65,000 shares Open-market sale of Ordinary Shares on May 26, 2026
Weighted average sale price $35.69 per share Ordinary Shares sold in multiple trades, range $35.12–$36.09
Options exercised at $10.00 60,000 shares Exercise of options with $10.00 exercise price on May 26, 2026
Options exercised at $10.90 5,000 shares Exercise of options with $10.90 exercise price on May 26, 2026
Shares held after transactions 24,353 shares Directly held Ordinary Shares following May 26, 2026 activity
Unvested RSU shares 22,000 shares Ordinary Shares subject to restricted stock unit awards, still vesting
weighted average price financial
"The price reported in Column 4 is a weighted average price."
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
restricted stock unit financial
"Includes 22,000 ordinary shares subject to restricted stock unit awards that remain subject to vesting."
A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.
option (right to buy) financial
"security_title: "Option (right to buy)" in the derivative transactions."
Exercise or conversion of derivative security financial
"transaction_code_description: "Exercise or conversion of derivative security"."
open-market sale financial
"transaction_action: "open-market sale" for the Ordinary Shares disposition."
An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.
vesting financial
"shares underlying the option vest in equal monthly installments over four years."
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.
SEC Form 4
FORM 4UNITED 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*
Kooij Louise Frederika

(Last)(First)(Middle)
C/O NEWAMSTERDAM PHARMA COMPANY N.V.
GOOIMEER 2-35

(Street)
NAARDENNETHERLANDS1411 DC

(City)(State)(Zip)

NETHERLANDS

(Country)
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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Accounting Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/26/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

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)
CodeVAmount(A) or (D)Price
Ordinary Shares05/26/2026M60,000A$1084,353D
Ordinary Shares05/26/2026M5,000A$10.989,353D
Ordinary Shares05/26/2026S65,000D$35.69(1)24,353(2)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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Option (right to buy)$1005/26/2026M60,000 (3)11/22/2032Ordinary Shares60,000$0.0080,015D
Option (right to buy)$10.905/26/2026M5,000 (4)01/01/2033Ordinary Shares5,000$0.0068,134D
Explanation of Responses:
1. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $35.12 to $36.09 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.
2. Includes 22,000 ordinary shares subject to restricted stock unit awards that remain subject to vesting.
3. The option was granted on November 22, 2022. The shares underlying the option vest in equal monthly installments over four years, with the first 1/48th of such shares vesting on December 1, 2022 and the remaining installments vesting on each one-month anniversary of the grant date, subject to the Reporting Person's continued service through each such date.
4. The option was granted on January 1, 2023. 25% of the shares underlying the option vest on the one-year anniversary of 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.
Remarks:
Reported transactions executed pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 23, 2026.
/s/ Louise Kooij05/27/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did NewAmsterdam Pharma (NAMS) report for its CAO?

NewAmsterdam Pharma reported that Chief Accounting Officer Louise Frederika Kooij exercised options for 65,000 Ordinary Shares and sold 65,000 shares in an open-market transaction on May 26, 2026, reflecting an exercise-and-sell pattern while retaining a remaining equity stake.

How many NewAmsterdam Pharma (NAMS) shares did the CAO sell and at what prices?

The CAO sold 65,000 Ordinary Shares at a weighted average price of $35.69 per share. According to the disclosure, the individual sale prices ranged from $35.12 to $36.09, executed across multiple transactions on the same trading day.

What option exercises did the NewAmsterdam Pharma (NAMS) CAO report?

She reported exercising options covering 5,000 shares at a $10.90 exercise price and 60,000 shares at a $10.00 exercise price. These exercises converted derivative option positions into Ordinary Shares before the corresponding open-market sale transactions were completed.

How many NewAmsterdam Pharma (NAMS) shares does the CAO hold after these transactions?

Following the May 26, 2026 transactions, the CAO directly holds 24,353 Ordinary Shares. This total includes 22,000 shares that are subject to restricted stock unit awards and remain unvested, continuing to vest over future service-based milestones.

What does the Form 4 say about the CAO’s restricted stock units in NewAmsterdam Pharma (NAMS)?

The filing notes that 22,000 Ordinary Shares are tied to restricted stock unit awards that are still subject to vesting. These RSUs represent potential future share delivery as the CAO continues to satisfy ongoing service-based vesting conditions with the company.

Were the NewAmsterdam Pharma (NAMS) CAO’s sales executed in one trade or multiple trades?

The sale price is reported as a weighted average, indicating multiple trades. The Form 4 explains that shares were sold in several transactions, with prices ranging from $35.12 to $36.09 per share on May 26, 2026.