Avantor (AVTR) accounting chief reports small RSU tax-withholding share disposals

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Form Type

Rhea-AI Filing Summary

Avantor SVP & Chief Accounting Officer Steven W. Eck reported two small tax-related share dispositions in Avantor common stock. On February 24, 452 shares were withheld at $9.11 per share to cover tax obligations from vesting RSUs, leaving 99,333 shares held directly. On February 23, 2,017 shares were similarly withheld at $8.89 per share for taxes after RSU vesting. These are reported as dispositions for tax withholding, not open‑market sales.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Eck Steven W

Role SVP & Chief Accounting Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	452	$9.11	$4K
Tax Withholding	Common Stock	2,017	$8.89	$18K

Holdings After Transaction: Common Stock — 99,333 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 02/25/2026 - 05:27 PM

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^*

Eck Steven W

(Last)

(First)

(Middle)

RADNOR CORPORATE CENTER, BUILDING ONE,

SUITE 200, 100 MATSONFORD ROAD

(Street)

RADNOR

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)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	SVP & Chief Accounting Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/23/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	02/23/2026		F⁽¹⁾		2,017	D	$8.89	99,785	D
Common Stock	02/24/2026		F⁽¹⁾		452	D	$9.11	99,333	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Represents the number of shares withheld by the Issuer to cover tax withholding obligations in connection with the vesting of RSUs.

Remarks:

	/s/ Scott Baker,by power of attorney for Steven Eck	02/25/2026
	** 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.

Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did Avantor (AVTR) report for Steven W. Eck?

Avantor reported two small dispositions by Steven W. Eck, its SVP & Chief Accounting Officer, where shares were withheld to cover tax obligations from vesting RSUs. These transactions are administrative tax-withholding events, not open-market purchases or sales of Avantor stock.

How many Avantor (AVTR) shares were involved in Steven W. Eck’s tax-withholding transactions?

The Form 4 shows 452 shares withheld on one date and 2,017 shares withheld on another, both in Avantor common stock. These amounts were used to satisfy tax obligations arising from restricted stock unit vesting, according to the filing’s footnote disclosure.

At what prices were Steven W. Eck’s Avantor (AVTR) tax-withholding shares valued?

The reported tax-withholding dispositions were valued at $9.11 per share for 452 shares and $8.89 per share for 2,017 shares. These prices reflect the fair market value used to calculate the shares withheld to satisfy RSU-related tax liabilities.

How many Avantor (AVTR) shares does Steven W. Eck hold after these Form 4 transactions?

After the February 24 tax-withholding transaction, Steven W. Eck directly held 99,333 shares of Avantor common stock. This post-transaction amount is reported in the Form 4 as the total shares beneficially owned following that tax-related disposition event.

Were Steven W. Eck’s Avantor (AVTR) transactions open-market sales or tax withholdings?

The transactions were tax withholdings, not open-market sales. The Form 4 uses transaction code F and a footnote explaining the issuer withheld shares to cover RSU-related tax obligations, indicating these are administrative dispositions for tax liabilities.