MKS Inc (MKSI) director trust sells 20,000 shares in open market

Rhea-AI Filing Summary

MKS Inc. director Gerald G. Colella reported open-market sales of company common stock held indirectly through The Gerald G. Colella 2019 Trust. The trust sold 10,000 shares on February 20, 2026 at a weighted average price of $252.8999 per share and another 10,000 shares on February 24, 2026 at a weighted average price of $253.9675 per share. After these sales, the trust held 40,017 shares, while Colella also held 8,216.927 shares directly.

Insider Trade Summary

Net Seller: 20,000 shares ($5,068,674)

Net Sell 3 txns

Insider COLELLA GERALD G

Role Director

Sold 20,000 shs ($5.07M)

Type	Security	Shares	Price	Value
Sale	Common Stock	10,000	$253.9675	$2.54M
Sale	Common Stock	10,000	$252.8999	$2.53M
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 40,017 shares (Indirect, By The Gerald G. Colella 2019 Trust); Common Stock — 8,216.927 shares (Direct)

Footnotes (1)

1. This transaction was executed in multiple trades at prices ranging from $252.60 to $253.86. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple trades at prices ranging from $253.470 to $255.250. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

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^*

COLELLA GERALD G

(Last) (First) (Middle)

C/O MKS INC.

2 TECH DRIVE

(Street)

ANDOVER MA 01810

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MKS INC [ MKSI ]

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)
02/20/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	02/20/2026		S		10,000	D	$252.8999(1)	50,017	I	By The Gerald G. Colella 2019 Trust
Common Stock	02/24/2026		S		10,000	D	$253.9675(2)	40,017	I	By The Gerald G. Colella 2019 Trust
Common Stock								8,216.927	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. This transaction was executed in multiple trades at prices ranging from $252.60 to $253.86. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

2. This transaction was executed in multiple trades at prices ranging from $253.470 to $255.250. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

	/s/ M. Kathryn Rickards, attorney-in-fact	02/24/2026
	** 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.

FAQ

What insider transaction did MKS Inc (MKSI) report for Gerald G. Colella?

MKS Inc reported that a trust associated with director Gerald G. Colella sold 20,000 shares of common stock in two open-market transactions. These trades occurred on February 20 and February 24, 2026, and were disclosed on a Form 4 insider trading report.

How many MKS Inc (MKSI) shares were sold and at what prices?

The trust sold 10,000 MKS Inc shares at a weighted average price of $252.8999 and another 10,000 shares at $253.9675. Both transactions were executed as open-market sales, with prices reflecting weighted averages across multiple trade executions.

Who actually holds the MKS Inc (MKSI) shares sold in this Form 4?

The shares were held indirectly through The Gerald G. Colella 2019 Trust, which is associated with director Gerald G. Colella. The Form 4 lists the ownership type as indirect, identifying the trust as the holder executing the open-market sales of MKS Inc common stock.

How many MKS Inc (MKSI) shares does the trust hold after the reported sales?

Following the reported transactions, The Gerald G. Colella 2019 Trust held 40,017 MKS Inc common shares. This figure reflects the remaining indirect ownership after selling a total of 20,000 shares in open-market trades reported in the Form 4 filing.

What is Gerald G. Colella’s direct ownership in MKS Inc (MKSI) after these trades?

After the reported transactions, Gerald G. Colella directly owned 8,216.927 MKS Inc common shares. This direct holding is listed separately from the 40,017 shares held indirectly through The Gerald G. Colella 2019 Trust, which executed the open-market sales.

What does the Form 4 indicate about the nature of these MKS Inc (MKSI) transactions?

The Form 4 classifies both trades as open-market sales of common stock, coded as “S.” It also notes the prices are weighted averages across multiple executions and offers to provide detailed trade price breakdowns upon request to interested parties.