Avantor (AVTR) director Joseph Massaro granted 25,270 restricted stock units

Rhea-AI Filing Summary

Massaro Joseph R reported acquisition or exercise transactions in this Form 4 filing.

Avantor director Joseph R. Massaro received a compensation-related stock grant. He was awarded 25,270 shares of Avantor common stock on May 7, 2026 as a grant or award, rather than a market purchase. The shares are in the form of restricted stock units that vest on May 7, 2027.

After this grant, Massaro directly owns 77,408 shares of Avantor common stock. This filing reflects an equity-based compensation decision by the company’s board, not an open-market transaction.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Massaro Joseph R

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	25,270	$0.00	--

Holdings After Transaction: Common Stock — 77,408 shares (Direct, null)

Footnotes (1)

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Key Figures

RSUs granted: 25,270 shares Grant price: $0.0000 per share Shares after transaction: 77,408 shares +1 more

4 metrics

RSUs granted 25,270 shares Restricted stock unit award on May 7, 2026

Grant price $0.0000 per share Equity compensation, not an open-market purchase

Shares after transaction 77,408 shares Total Avantor common stock directly owned by Massaro

Vesting date May 7, 2027 Restricted stock units vest on this date

Key Terms

restricted stock units, Grant, award, or other acquisition, Form 4

3 terms

restricted stock units financial

"Reflects a grant of restricted stock units that vests on May 07, 2027."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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
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^*

Massaro Joseph R

(Last) (First) (Middle)

RADNOR CORPORATE CENTER, BUILDING ONE,

SUITE 200, 100 MATSONFORD ROAD

(Street)

RADNOR PENNSYLVANIA 19087

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/07/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form 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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/07/2026		A(1)		25,270	A	$0	77,408	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. Reflects a grant of restricted stock units that vests on May 07, 2027.

Remarks:

	/s/ Scott Baker, as Attorney-in-Fact	05/11/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What did Avantor (AVTR) director Joseph R. Massaro report in this Form 4?

Joseph R. Massaro reported receiving 25,270 shares of Avantor common stock as a grant. The award is in the form of restricted stock units, part of his director compensation, rather than an open-market stock purchase or sale.

Is the Avantor (AVTR) Form 4 transaction a stock purchase or a compensation grant?

The Form 4 shows a compensation grant, not a market purchase. The transaction is coded as an award acquisition, reflecting restricted stock units granted to director Joseph R. Massaro at no cash cost per share.

When do Joseph R. Massaro’s Avantor (AVTR) restricted stock units vest?

The restricted stock units granted to Joseph R. Massaro vest on May 7, 2027. Vesting means he will fully earn the shares on that date, assuming any applicable service or other conditions are satisfied.

How many Avantor (AVTR) shares does Joseph R. Massaro hold after this grant?

Following the grant, Joseph R. Massaro directly holds 77,408 Avantor common shares. This total includes the newly awarded 25,270 restricted stock units reported in the Form 4 insider filing.

What does the zero price per share in the Avantor (AVTR) Form 4 indicate?

The zero price per share indicates the shares were granted as compensation rather than bought. Restricted stock unit awards typically have no cash exercise price and are earned over time, subject to vesting conditions.