[Form 3] Avantor, Inc. Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Avantor (AVTR) insider filing: An Avantor executive serving as EVP, Chief Operating Officer filed a Form 3 initial statement of beneficial ownership. The filing reports no securities are beneficially owned as of the event date 11/10/2025. The document includes an Exhibit 24 power of attorney and was signed by an attorney‑in‑fact.

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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

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1. Name and Address of Reporting Person^*

Blenn Mary

(Last) (First) (Middle)

RADNOR CORPORATE CENTER, BUILDING ONE,

SUITE 200, 100 MATSONFORD ROAD

(Street)

RADNOR PA 19087

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
11/10/2025

3. Issuer Name and Ticker or Trading Symbol
Avantor, Inc. [ AVTR ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Chief Operating Officer

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit List: Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	/s/ Scott K. Baker, as Attorney-in-Fact	11/12/2025
	** Signature of Reporting Person	Date
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 5 (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.

FAQ

What did Avantor (AVTR) disclose in this filing?

A Form 3 initial statement of beneficial ownership indicating no securities are beneficially owned.

Whose ownership does this Form 3 cover at Avantor (AVTR)?

An executive who is the EVP, Chief Operating Officer.

What is the event date on the Avantor (AVTR) Form 3?

The event date is 11/10/2025.

Does the Form 3 show any Avantor (AVTR) shares owned?

No. The filing states that no securities are beneficially owned.

How was the Avantor (AVTR) Form 3 signed?

It was signed by /s/ Scott K. Baker as attorney-in-fact under an Exhibit 24 power of attorney.

Is this Form 3 a joint filing for multiple persons?

No. It indicates the form is filed by one reporting person.