MKS CFO sells 8,810 shares in open-market trade

MKS INC EVP & CFO Mayampurath Ramakumar sold 8,810 shares of Common Stock in an open-market transaction.

Rhea-AI Filing Summary

MKS INC EVP & CFO Mayampurath Ramakumar sold 8,810 shares of Common Stock in an open-market transaction. The sale took place on May 22, 2026 at an average price of $315.4800 per share.

After this transaction, he directly owned 1.1390 shares of MKS INC common stock, according to the filing. The sale was carried out under a pre-arranged Rule 10b5-1 trading plan adopted on February 20, 2026, indicating it was scheduled in advance rather than timed discretionarily.

Insider Trade Summary 10b5-1

Net Seller: 8,810 shares

Net Sell 1 txn

Insider Mayampurath Ramakumar

Role EVP & CFO

Sold 8,810 shs ($2.78M)

Type	Security	Shares	Price	Value
Sale	Common Stock	8,810	$315.48	$2.78M

Holdings After Transaction: Common Stock — 1.139 shares (Direct)

Footnotes (1)

1. F1. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 20, 2026.

Key Figures

Shares sold: 8,810 shares Sale price: $315.4800 per share Shares after transaction: 1.1390 shares +3 more

6 metrics

Shares sold 8,810 shares Open-market sale on May 22, 2026

Sale price $315.4800 per share Average price for Common Stock sold

Shares after transaction 1.1390 shares Direct holdings following sale

Net shares sold 8,810 shares Net-sell direction in transactionSummary

Transaction code S Sale in open market or private transaction

10b5-1 plan adoption date February 20, 2026 Date CFO adopted trading plan

Key Terms

Rule 10b5-1 trading plan, open-market sale, Common Stock, Form 4

4 terms

Rule 10b5-1 trading plan regulatory

"This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Common Stock financial

"security_title": "Common Stock""

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.

Form 4 regulatory

"routine insider sale reported on Form 4 for regulatory transparency"

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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did MKS INC (MKSI) disclose for its CFO?

MKS INC disclosed that EVP & CFO Mayampurath Ramakumar completed an open-market sale of 8,810 shares of Common Stock. The transaction occurred on May 22, 2026 and reflects a routine insider sale reported on Form 4 for regulatory transparency.

At what price did the MKS INC CFO sell his MKSI shares?

The CFO’s reported sale was executed at an average price of $315.4800 per share. This price applies to the full 8,810 shares sold and is disclosed to show the actual trading level for this insider transaction on May 22, 2026.

How many MKS INC shares does the CFO hold after this Form 4 sale?

Following the reported transaction, the CFO directly owned 1.1390 shares of MKS INC Common Stock. This post-transaction holding figure comes directly from the Form 4 and shows his remaining direct ownership after selling 8,810 shares.

Was the MKS INC CFO’s MKSI share sale under a Rule 10b5-1 plan?

Yes. The filing states the sale was effected under a Rule 10b5-1 trading plan adopted on February 20, 2026. Such plans allow insiders to schedule trades in advance, helping separate personal trading decisions from access to nonpublic information.

What type of transaction code was used in the MKS INC CFO Form 4?

The transaction used code "S," indicating a sale in an open market or private transaction. This code, together with the description "Sale in open market or private transaction," confirms it was a standard disposition of Common Stock rather than an option exercise.

Did the MKS INC Form 4 show any derivative securities for the CFO?

No derivative securities were listed in this Form 4 for the CFO. The derivativeSummary section was empty, indicating the filing reported only a non-derivative transaction in Common Stock without options, warrants, or other derivative positions being exercised or converted.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/26/2026 - 02:18 PM EDT Learn about SEC filing dates

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).

X

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^*

Mayampurath Ramakumar

(Last) (First) (Middle)

C/O MKS INC.

2 TECH DRIVE

(Street)

ANDOVER MASSACHUSETTS 01810

(City) (State) (Zip)

UNITED STATES

(Country)

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

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP & CFO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/22/2026

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	05/22/2026		S(1)		8,810	D	$315.48	1.139	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 effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 20, 2026.

	/s/ M. Kathryn Rickards, attorney-in-fact	05/26/2026
	** 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)