Avantor (AVTR) director-linked trust purchases 100,000 common shares

Rhea-AI Filing Summary

Avantor director Gregory L. Summe, through a trust, executed an open-market purchase of 100,000 shares of Common Stock at a weighted average price of $12.56 per share. The shares were bought in multiple trades between $12.50 and $12.63.

Following this transaction, the trust holds 200,000 Avantor shares indirectly attributed to Summe, while he also directly holds 58,111 shares. He reports beneficial ownership of the trust’s shares but disclaims beneficial ownership beyond his pecuniary interest.

Insider Trade Summary

Net Buyer: 100,000 shares ($1,256,000)

Net Buy 2 txns

Insider SUMME GREGORY L

Role Director

Bought 100,000 shs ($1.26M)

Type	Security	Shares	Price	Value
Purchase	Common Stock	100,000	$12.56	$1.26M
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 200,000 shares (Indirect, By a Trust); Common Stock — 58,111 shares (Direct)

Footnotes (1)

1. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $12.50 to $12.63, inclusive. The Reporting Person undertakes to provide 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 purchased at each price within the range set forth above. By a trust. The reporting person reports beneficial ownership of AVTR common stock held by the trust but disclaims beneficial ownership except to the extent of his pecuniary interest therein.

Form 4 Insider Transactions: What Each Field Means →

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
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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)
08/21/2025

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	08/21/2025		P		100,000	A	$12.56(1)	200,000(2)	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. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions ranging from $12.50 to $12.63, inclusive. The Reporting Person undertakes to provide 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 purchased at each price within the range set forth above.

2. By a trust. The reporting person reports beneficial ownership of AVTR common stock held by the 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	08/22/2025
	** 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) director Gregory L. Summe report in this Form 4?

Gregory L. Summe reported an indirect open-market purchase of Avantor stock. A trust associated with him bought 100,000 shares of Common Stock, and he also reported his resulting direct and indirect share holdings after the transaction.

How many Avantor (AVTR) shares were purchased and at what price range?

The trust purchased 100,000 Avantor Common Stock shares. The weighted average purchase price was $12.56 per share, with individual trades executed in a price range between $12.50 and $12.63, according to the filing’s transaction footnote.

Is the Avantor (AVTR) stock purchase by Gregory L. Summe direct or through an entity?

The 100,000-share purchase was made indirectly through a trust. The filing states the shares are held by a trust, and Summe reports beneficial ownership but disclaims beneficial ownership except to the extent of his pecuniary interest in that trust.

What are Gregory L. Summe’s Avantor (AVTR) holdings after this transaction?

After the purchase, the trust holds 200,000 Avantor shares indirectly attributed to Summe. In addition, he directly holds 58,111 shares of Common Stock, as reported in the holding entry within the Form 4 data.

Was this Avantor (AVTR) transaction an open-market purchase or another type of trade?

The Form 4 describes the transaction as an open-market purchase. It is coded as a “P” transaction, identified as a purchase in the open market or a private transaction, with no derivative exercises or option-related activity disclosed in this filing.

Does this Avantor (AVTR) Form 4 involve any stock options or derivatives?

No stock options or derivatives are reported in this Form 4. All disclosed activity involves Common Stock, and the derivative position summary is empty, indicating no option exercises or other derivative transactions in the reported period.