AVTR insider purchase: 100,000 shares acquired at $11.25

Rhea-AI Filing Summary

Avantor (AVTR) Form 4: A company director reported buying 100,000 shares of common stock on 10/30/2025 at $11.25 per share (transaction code P). Following the trade, reported holdings are 300,000 shares held indirectly by a trust and 58,111 shares held directly.

The footnote states the reporting person disclaims beneficial ownership of shares held by the trust except to the extent of his pecuniary interest.

Insider Trade Summary

Net Buyer: 100,000 shares ($1,125,000)

Net Buy 2 txns

Insider SUMME GREGORY L

Role Director

Bought 100,000 shs ($1.13M)

Type	Security	Shares	Price	Value
Purchase	Common Stock	100,000	$11.25	$1.13M
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 300,000 shares (Indirect, By a Trust); Common Stock — 58,111 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 10/31/2025 - 09:46 AM Learn about SEC filing dates

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).

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^*

SUMME GREGORY L

(Last) (First) (Middle)

RADNOR CORPORATE CENTER, BUILDING ONE

SUITE 200, 100 MATSONFORD ROAD

(Street)

RADNOR PA 19087

(City) (State) (Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
10/30/2025

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
Common Stock	10/30/2025		P		100,000	A	$11.25	300,000(1)	I	By a Trust
Common Stock								58,111	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

Explanation of Responses:

1. By a trust. The reporting person reports beneficial ownership of AVTR common stock held by trust but disclaims beneficial ownership except to the extent of his pecuniary interest therein.

Remarks:

	/s/ Scott Baker, by power of attorney for Greg Summe	10/31/2025
	** 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 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.

FAQ

What did Avantor (AVTR) report in this Form 4?

A director purchased 100,000 AVTR common shares on 10/30/2025 at $11.25 per share.

How many Avantor (AVTR) shares does the insider now own?

Reported holdings are 300,000 shares indirectly by a trust and 58,111 shares directly.

What was the transaction code on the Form 4 for AVTR?

The transaction code was P, indicating an open-market or private purchase.

Is the indirect ownership through a trust clarified?

Yes. The footnote says beneficial ownership of trust-held shares is disclaimed except to the extent of pecuniary interest.

What is the reported purchase price per AVTR share?

The reported price was $11.25 per share.

What is the insider’s relationship to Avantor (AVTR)?

The reporting person is a Director of Avantor, Inc.