# EDGAR Filing Document

**Accession Number:** 0001049502
**File Stem:** 0001193125-26-027243
**Filing Date:** 2026-1
**Character Count:** 19620
**Document Hash:** b78c8936c0f833cf7229962270630e1a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-027243.hdr.sgml**: 20260128

**ACCESSION NUMBER**: 0001193125-26-027243

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 18

**CONFORMED PERIOD OF REPORT**: 20260126

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260128

**DATE AS OF CHANGE**: 20260128

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MKS INC
- **CENTRAL INDEX KEY:** 0001049502
- **STANDARD INDUSTRIAL CLASSIFICATION:** INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 042277512
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-23621
- **FILM NUMBER:** 26572636

**BUSINESS ADDRESS:**
- **STREET 1:** 2 TECH DRIVE
- **CITY:** ANDOVER
- **STATE:** MA
- **ZIP:** 01810
- **BUSINESS PHONE:** 978-645-5500

**MAIL ADDRESS:**
- **STREET 1:** 2 TECH DRIVE
- **CITY:** ANDOVER
- **STATE:** MA
- **ZIP:** 01810

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MKS INSTRUMENTS INC
- **DATE OF NAME CHANGE:** 19971112

?xml version='1.0' encoding='ASCII'? 8-K

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, D.C. 20549

### FORM 8-K

#### CURRENT REPORT

#### Pursuant to Section 13 or 15(d)

#### of the Securities Exchange Act of 1934

#### Date of Report (Date of earliest event reported): January 26, 2026

## MKS INC.

#### (Exact name of Registrant as Specified in Its Charter)

---

| | | |
|:---|:---|:---|
| **Massachusetts** | **000-23621** | **04-2277512** |
| **(State or Other Jurisdiction<br>of Incorporation)** | **(Commission**<br> **File Number)** | **(IRS Employer<br>Identification No.)** |

---

---

| | |
|:---|:---|
| **2 Tech Drive** |  |
| **Andover, Massachusetts** | **01810** |
| **(Address of Principal Executive Offices)** | **(Zip Code)** |

---

#### Registrant's Telephone Number, Including Area Code: 978 645-5500

#### Not Applicable

#### (Former Name or Former Address, if Changed Since Last Report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

#### Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading<br>Symbol(s)** | **Name of each exchange**<br> **on which registered** |
| Common Stock, no par value | MKSI | Nasdaq Global Select Market |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

------

---

| | |
|:---|:---|
| **Item 8.01** | **Other Events.**  |

---

*Notes Offering* 

On January 26, 2026, MKS Inc. (the "Company") issued a press release announcing a proposed offering (the "Offering") of €1.0 billion aggregate principal amount of senior notes due 2034 (the "Notes") in a private placement to persons reasonably believed to be qualified institutional buyers in reliance on Rule 144A under the Securities Act of 1933, as amended (the "Securities Act") and to non-U.S. persons outside the United States in reliance on Regulation S under the Securities Act.

On January 28, 2026, the Company issued a press release announcing the pricing of the Offering.

The Company estimates that the net proceeds from the Offering will be approximately €985 million, after deducting the initial purchasers' discounts and estimated Offering expenses payable by the Company. The Company intends to use the net proceeds from the Offering, together with the net proceeds from the previously announced partial refinancing of its existing $2.2 billion U.S. dollar tranche B term loan (the "USD Tranche B Term Loan"), the net proceeds from the previously announced refinancing of its existing €587 million euro tranche B term loan (the "Euro Tranche B Term Loan" and together with the USD Tranche B Term Loan, the "Term Loan Facility") and cash on hand, to prepay approximately $1.3 billion of, and refinance in full, the USD Tranche B Term Loan, and refinance in full the Euro Tranche B Term Loan.

The closing of the Offering is expected to occur on February 4, 2026, subject to satisfaction of customary closing conditions, substantially concurrently with the closing of the previously announced refinancing of the Company's Term Loan Facility, but the closing of the Offering is not contingent upon the closing of the refinancing.

Copies of the press releases announcing the Offering and the pricing of the Offering are attached to this Current Report on Form 8-K as Exhibits 99.1 and 99.2, respectively, and are incorporated herein by reference.

This Current Report on Form 8-K shall not constitute an offer to sell, or a solicitation of an offer to buy, nor shall there be any sale of, any securities of the Company in any state or jurisdiction in which such offer, solicitation or sale would be unlawful under the securities laws of any such state or jurisdiction.

#### Safe Harbor for Forward-Looking Statements
This Current Report on Form 8-K contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended, including, but not limited to, the Company's refinancing plans and the details thereof, including the timing and completion of the Offering and the previously announced refinancing of the Company's term loan facility, the proposed use of proceeds therefrom and the details thereof, the Company's ability to complete the transactions described herein and the other expected effects thereof. There can be no assurance that the Company will be able to complete the transactions described herein on the anticipated terms, or at all. These statements are only predictions based on current assumptions and expectations. Any statements that are not statements of historical fact (including statements containing the words "will," "projects," "intends," "believes," "plans," "anticipates," "expects," "estimates," "forecasts," "continues" and similar expressions) should be considered to be forward-looking statements. Forward-looking statements are not promises or guarantees of future performance and are subject to a variety of risks and uncertainties, many of which are beyond the Company's control. Actual results may differ materially from those described in the forward-looking statements and will be affected by a variety of risks and factors that are beyond the Company's control including, without limitation, market risks and uncertainties, the completion of the transactions described herein on the anticipated terms or at all, and other important risks and factors described in the Company's Annual Report on Form 10-K for the year ended December 31, 2024, any subsequent Quarterly Reports on Form 10-Q, the preliminary offering memorandum related to the Offering, and in subsequent filings made by the Company with the U.S. Securities and Exchange Commission. Forward-looking statements speak only as of the date hereof, and, except as required by law, the Company undertakes no obligation to update or revise these forward-looking statements.

------

---

| | |
|:---|:---|
| **Item 9.01.** | **Financial Statements and Exhibits.**  |

---

(d) Exhibits:

---

| | |
|:---|:---|
| **Exhibit<br>No.** | **Description** |
| 99.1 | [Press Release, dated January 26, 2026, of MKS Inc.](d85940dex991.htm) |
| 99.2 | [Press Release, dated January 28, 2026, of MKS Inc.](d85940dex992.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

---

------

#### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
| Date: January 28, 2026 | MKS Inc. | MKS Inc. |
|  | By: | /s/ Kathleen F. Burke |
|  | Name: | Kathleen F. Burke |
|  | Title: | Executive Vice President, General Counsel and Secretary |

---

## Exhibit 99.1

**Exhibit 99.1**![LOGO](g85940g0128073756616.jpg)

**MKS Announces Proposed Private Offering of** 

**€1.0 Billion of Senior Notes** 

**ANDOVER, MA, January 26, 2026 –** MKS Inc. (NASDAQ: MKSI) ("MKS") today announced that it intends to offer €1.0 billion aggregate principal amount of senior notes due 2034 (the "notes") in a private offering (the "offering"). The offering is subject to market and other conditions, and there can be no assurance as to whether, when or on what terms the offering may be completed.

The notes will be unsecured, senior obligations of MKS, and will be guaranteed on a senior unsecured basis by certain subsidiaries of MKS. MKS intends to use the net proceeds from the offering, together with the net proceeds from the previously announced partial refinancing of its existing $2.2 billion U.S. dollar tranche B term loan (the "USD Tranche B Term Loan"), the net proceeds from the previously announced refinancing of its existing €587 million euro tranche B term loan (the "Euro Tranche B Term Loan" and together with the USD Tranche B Term Loan, the "Term Loan Facility") and cash on hand, to (i) prepay approximately $1.3 billion of, and refinance in full, the USD Tranche B Term Loan, and (ii) refinance in full the Euro Tranche B Term Loan.

The notes will be offered and sold to persons reasonably believed to be qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the "Securities Act") and to non-U.S. persons outside the United States in reliance on Regulation S under the Securities Act. The offer and sale of the notes have not been and will not be registered under the Securities Act or any state securities laws and such securities may not be offered or sold in the United States absent registration or an applicable exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and other applicable securities laws. Any offer of the notes will be made only by means of a private offering memorandum.

This press release shall not constitute an offer to sell, or a solicitation of an offer to buy, nor shall there be any sale of, any securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful under the securities laws of any such state or jurisdiction.

**Safe Harbor for Forward Looking Statements** 

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended, including, but not limited to, MKS' refinancing plans and the details thereof, including the size and timing of the offering and the refinancing of the Term Loan Facility, the proposed use of proceeds therefrom and the details thereof, the terms of the notes, MKS' ability to complete the transactions described in this press release and the other expected effects thereof. These statements are only predictions based on current

![LOGO](g85940footer.jpg)

------

![LOGO](g85940g0128073756616.jpg)

assumptions and expectations. Any statements that are not statements of historical fact (including statements containing the words "will," "projects," "intends," "believes," "plans," "anticipates," "expects," "estimates," "forecasts," "continues" and similar expressions) should be considered to be forward-looking statements. Forward-looking statements are not promises or guarantees of future performance and are subject to a variety of risks and uncertainties, many of which are beyond MKS' control. Actual results may differ materially from those described in the forward-looking statements and will be affected by a variety of risks and factors that are beyond MKS' control including, without limitation, market risks and uncertainties, the completion of the offering and the previously announced refinancing of the Term Loan Facility on the anticipated terms or at all, and other important risks and factors described in MKS' Annual Report on Form 10-K for the year ended December 31, 2024, any subsequent Quarterly Reports on Form 10-Q, the preliminary offering memorandum related to the offering and in subsequent filings made by MKS with the U.S. Securities and Exchange Commission. Forward-looking statements speak only as of the date hereof, and, except as required by law, MKS undertakes no obligation to update or revise these forward-looking statements.

###

<u>MKS Investor Relations Contact</u>:

Paretosh Misra

Vice President, Investor Relations

Telephone: (978) 284-4705

Email: <u>paretosh.misra@mks.com</u>

<u>Press Relations Contacts</u>:

Bill Casey

Vice President, Marketing

Telephone: (630) 995-6384

Email: <u>press@mksinst.com</u>

Kerry Kelly, Partner

Kekst CNC

Email: kerry.kelly@kekstcnc.com

![LOGO](g85940footer7.jpg)

## Exhibit 99.2

**Exhibit 99.2**![LOGO](g85940g0128073756616.jpg)

**MKS Announces Pricing of Private Offering of** 

**€1 Billion of 4.250% Senior Notes** 

**ANDOVER, MA, January 28, 2026 –** MKS Inc. (NASDAQ: MKSI) ("MKS") today announced the pricing of its private offering (the "offering") of €1.0 billion aggregate principal amount of 4.250% senior notes due 2034 (the "notes"). The offering is expected to close on February 4, 2026, subject to satisfaction of customary closing conditions.

MKS estimates that the net proceeds from the offering will be approximately €985 million, after deducting the initial purchasers' discounts and estimated offering expenses payable by MKS.

MKS intends to use the net proceeds from the offering, together with the net proceeds from the previously announced partial refinancing of its existing $2.2 billion U.S. dollar tranche B term loan (the "USD Tranche B Term Loan"), the net proceeds from the previously announced refinancing of its existing €587 million euro tranche B term loan (the "Euro Tranche B Term Loan" and together with the USD Tranche B Term Loan, the "Term Loan Facility") and cash on hand, to (i) prepay approximately $1.3 billion of, and refinance in full, the USD Tranche B Term Loan, and (ii) refinance in full the Euro Tranche B Term Loan.

The closing of the offering is expected to occur substantially concurrently with the closing of the previously announced refinancing of the Term Loan Facility, but the closing of the offering is not contingent upon the closing of such refinancing, and the closing of such refinancing is not contingent upon the closing of the offering.

The notes will be unsecured, senior obligations of MKS, and will be guaranteed on a senior unsecured basis by certain subsidiaries of MKS. The notes will bear interest payable semi-annually in arrears on February 15 and August 15 of each year, beginning on August 15, 2026. The notes will mature on February 15, 2034, unless earlier redeemed or repurchased in accordance with their terms.

The notes are being offered and sold to persons reasonably believed to be qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the "Securities Act") and to non-U.S. persons outside the United States in reliance on Regulation S under the Securities Act. The offer and sale of the notes have not been and will not be registered under the Securities Act or any state securities laws and such securities may not be offered or sold in the United States absent registration or an applicable exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and other applicable securities laws. The offering is being made only by means of a private offering memorandum.

![LOGO](g85940footer.jpg)

------

![LOGO](g85940g0128073756616.jpg)

This press release shall not constitute an offer to sell, or a solicitation of an offer to buy, nor shall there be any sale of, any securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful under the securities laws of any such state or jurisdiction.

**Safe Harbor for Forward Looking Statements** 

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended, including, but not limited to, MKS' refinancing plans and the details thereof, including the timing of the offering and the refinancing of the Term Loan Facility, the proposed use of proceeds therefrom and the details thereof, the terms of the notes, MKS' ability to complete the transactions described in this press release and the other expected effects thereof. These statements are only predictions based on current assumptions and expectations. Any statements that are not statements of historical fact (including statements containing the words "will," "projects," "intends," "believes," "plans," "anticipates," "expects," "estimates," "forecasts," "continues" and similar expressions) should be considered to be forward-looking statements. Forward-looking statements are not promises or guarantees of future performance and are subject to a variety of risks and uncertainties, many of which are beyond MKS' control. Actual results may differ materially from those described in the forward-looking statements and will be affected by a variety of risks and factors that are beyond MKS' control including, without limitation, market risks and uncertainties, the completion of the offering and the previously announced refinancing of the Term Loan Facility on the anticipated terms or at all, and other important risks and factors described in MKS' Annual Report on Form 10-K for the year ended December 31, 2024, any subsequent Quarterly Reports on Form 10-Q, the preliminary offering memorandum related to the offering and in subsequent filings made by MKS with the U.S. Securities and Exchange Commission. Forward-looking statements speak only as of the date hereof, and, except as required by law, MKS undertakes no obligation to update or revise these forward-looking statements.

###

![LOGO](g85940footer7.jpg)

------

![LOGO](g85940g0128073756616.jpg)

<u>MKS Investor Relations Contact</u>:

Paretosh Misra

Vice President, Investor Relations

Telephone: (978) 284-4705

Email: <u>paretosh.misra@mks.com</u>

<u>Press Relations Contacts</u>:

Bill Casey

Vice President, Marketing

Telephone: (630) 995-6384

Email: <u>press@mksinst.com</u>

Kerry Kelly, Partner

Kekst CNC

Email: <u>kerry.kelly@kekstcnc.com</u>

![LOGO](g85940footer10.jpg)