Avantor (AVTR) director adds 25,000 shares via open-market purchase

Rhea-AI Filing Summary

Avantor, Inc. director Simon Dingemans reported an open-market purchase of 25,000 shares of Common Stock. The trade was executed at a price of $8.14 per share and is reported as indirect ownership "By Spouse", meaning the shares are held by his spouse but attributed to him for reporting.

The filing also shows Dingemans with 6,225 shares of Common Stock held directly as of the same date in a separate holding entry. There are no derivative securities reported, so this update reflects only common stock ownership.

Insider Trade Summary

Net Buyer: 25,000 shares ($203,500)

Net Buy 2 txns

Insider Dingemans Simon

Role null

Bought 25,000 shs ($204K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	25,000	$8.14	$204K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 25,000 shares (Indirect, By Spouse); Common Stock — 6,225 shares (Direct, null)

Footnotes (1)

Key Figures

Open-market purchase: 25,000 shares Purchase price: $8.14 per share Indirect holding by spouse: 25,000 shares +1 more

4 metrics

Open-market purchase 25,000 shares Common Stock bought at $8.14 per share

Purchase price $8.14 per share Open-market buy of 25,000 Common Stock shares

Indirect holding by spouse 25,000 shares Common Stock held as indirect ownership "By Spouse"

Direct common stock holding 6,225 shares Direct ownership of Common Stock as of transaction date

Key Terms

open-market purchase, indirect ownership, Common Stock, By Spouse

4 terms

open-market purchase financial

"reported an open-market purchase of 25,000 shares of Common Stock"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

indirect ownership financial

"reported as indirect ownership "By Spouse", meaning the shares are held"

Common Stock financial

"purchase of 25,000 shares of Common Stock at $8.14 per share"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

By Spouse financial

"reported as indirect ownership "By Spouse", meaning the shares are held"

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^*

Dingemans Simon

(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)
05/01/2026

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	05/01/2026		P		25,000	A	$8.14	25,000	I	By Spouse
Common Stock								6,225	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:

Remarks:

	/s/ Scott Baker, as Attorney-in-Fact	05/04/2026
	** 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 Simon Dingemans report in this Form 4?

He reported an open-market purchase of 25,000 shares of Avantor Common Stock at $8.14 per share, held as indirect ownership by his spouse, along with a separate direct holding of 6,225 shares.

Was the Avantor (AVTR) transaction a buy or sell for Simon Dingemans?

The filing shows a buy. Dingemans reported an open-market purchase of 25,000 shares of Avantor Common Stock at $8.14 per share, classified as an open-market purchase rather than a sale or other type of transaction.

How many Avantor (AVTR) shares does Simon Dingemans hold directly and indirectly?

The Form 4 lists 6,225 shares held directly and 25,000 shares held indirectly "By Spouse." These figures show both his personal common stock position and the additional shares attributed to him through his spouse.

What is the significance of "By Spouse" in the Avantor (AVTR) Form 4?

“By Spouse” indicates the 25,000 purchased shares are held in the spouse’s name, but are reported as indirect ownership for Dingemans under SEC rules, reflecting his attributed beneficial interest in those shares.

Does this Avantor (AVTR) Form 4 include any options or other derivatives?

No. The derivative section in the filing is empty, and the transactions disclosed involve only Common Stock. The report covers a direct common stock holding and an open-market common stock purchase held indirectly by his spouse.