FMR LLC reports 3.3% stake in MKS Inc

MKS Inc ownership filing: FMR LLC reports beneficial ownership of 2,243,989.13 shares of Common Stock, representing 3.3% of the class as of 03/31/2026.

Rhea-AI Filing Summary

MKS Inc ownership filing: FMR LLC reports beneficial ownership of 2,243,989.13 shares of Common Stock, representing 3.3% of the class as of 03/31/2026. The filer reports sole dispositive power for 2,243,989.13 shares and sole voting power for 2,185,157.72 shares.

The amendment names Abigail P. Johnson in a related capacity and references an Exhibit 99 agreement and an incorporated power of attorney effective April 13, 2026.

Insights

Institutional Ownership Analyst

FMR LLC reports a passive, sub-5% stake in MKS Inc.

The schedule amends prior ownership details by documenting 2,243,989.13 shares (3.3%). The filing lists specific voting and dispositive power allocations, which clarify who exercises control over sale and voting decisions.

Exhibit references and a Power of Attorney effective April 13, 2026 are included; subsequent filings or exhibits may detail any arrangements but timing and cash-flow treatment are not stated in the excerpt.

Proxy & Governance Specialist

Filing documents beneficial ownership and authority lines for disclosure compliance.

The schedule identifies both FMR LLC and Abigail P. Johnson with dispositive and voting powers, and notes an Exhibit 99 13d-1(k)(1) agreement. This is typical reporting to satisfy beneficial ownership and control-power disclosure rules.

Material governance implications depend on any undisclosed agreements in Exhibit 99; the excerpt does not state any changes to voting arrangements or commitments.

Key Figures

Beneficially owned: 2,243,989.13 shares Percent of class: 3.3% Sole voting power: 2,185,157.72 shares +2 more

5 metrics

Beneficially owned 2,243,989.13 shares as of 03/31/2026

Percent of class 3.3% common stock

Sole voting power 2,185,157.72 shares reported on cover page

Sole dispositive power 2,243,989.13 shares reported on cover page

Filing type Schedule 13G/A ownership amendment

Key Terms

beneficially owned, sole dispositive power, Schedule 13G/A, 13d-1(k)(1) agreement

4 terms

beneficially owned regulatory

"Amount beneficially owned: 2243989.13"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole dispositive power regulatory

"Sole Dispositive Power 2,243,989.13"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Schedule 13G/A regulatory

"FORM TYPE: SCHEDULE 13G/A (Amendment No. 1)"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

13d-1(k)(1) agreement regulatory

"Please see Exhibit 99 for 13d-1(k)(1) agreement"

FAQ

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

What stake does FMR LLC hold in MKSI according to this filing?

FMR LLC holds 2,243,989.13 shares, equal to 3.3% of MKS Inc common stock as of 03/31/2026. The schedule clarifies the filer’s dispositive and voting powers tied to that share count.

Who has voting and dispositive power over the reported MKSI shares?

The filing shows sole dispositive power for 2,243,989.13 shares and sole voting power for 2,185,157.72 shares. Shared voting and dispositive powers are recorded as 0.00 in the excerpt.

Does the filing identify any other persons connected to the MKSI ownership report?

Yes. Abigail P. Johnson is named with related dispositive authority for 2,243,989.13 shares. The amendment also references a Power of Attorney and Exhibit 99 for further relationships.

Is this ownership above the 5% Schedule 13D threshold for MKSI?

No. The reported 3.3% stake is below the 5% threshold that typically triggers Schedule 13D treatment; this filing is a Schedule 13G/A amendment reflecting passive or qualifying investor status.

What exhibits are referenced that provide more detail on the MKSI filing?

The amendment references Exhibit 99 for a 13d-1(k)(1) agreement and an existing Exhibit 24 power of attorney effective April 13, 2026, which are cited for additional authority and agreement details.

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

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Accepted by SEC EDGAR 05/06/2026 - 11:30 AM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

MKS INC

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

55306N104

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 55306N104

1

Names of Reporting Persons

FMR LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,185,157.72
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,243,989.13
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,243,989.13

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

3.3 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 55306N104

1

Names of Reporting Persons

Abigail P. Johnson

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,243,989.13
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,243,989.13

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

3.3 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: MKS INC
(b)	Address of issuer's principal executive offices: 2 TECH DRIVE,ANDOVER,MA,US,01810
Item 2.
(a)	Name of person filing: FMR LLC
(b)	Address or principal business office or, if none, residence: 245 Summer Street, Boston, Massachusetts 02210
(c)	Citizenship: Not applicable
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP No.: 55306N104
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 2243989.13
(b)	Percent of class: 3.3 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Please see the responses to Items 5 and 6 on the cover page.
	(ii) Shared power to vote or to direct the vote: 0.00
	(iii) Sole power to dispose or to direct the disposition of: 2243989.13
	(iv) Shared power to dispose or to direct the disposition of: 0.00
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. One or more other persons are known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the COMMON STOCK of MKS INC. No one other person's interest in the COMMON STOCK of MKS INC is more than five percent of the total outstanding COMMON STOCK.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See attached Exhibit 99.
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

FMR LLC

Signature:	Richard Bourgelas
Name/Title:	Duly authorized under Power of Attorney effective as of April 13, 2026, by and on behalf of FMR LLC and its direct and indirect subsidiaries*
Date:	05/05/2026

Abigail P. Johnson

Signature:	Richard Bourgelas
Name/Title:	Duly authorized under Power of Attorney effective as of April 13, 2026, by and on behalf of Abigail P. Johnson*
Date:	05/05/2026

Comments accompanying signature: *This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on April 29,2026, accession number: 0000315066-26-000738.

Exhibit Information

Please see Exhibit 99 for 13d-1(k) (1) agreement.