The substantive disclosure content of this filing is limited to: NPK International Inc. filed an 8-K on October 29, 2026, announcing a press release with financial results for the three and nine months ended September 30, 2026, attached as Exhibit 99.1, along with a description of non-GAAP financial measures used. That is sufficient substantive content (well over 150 words when the non-GAAP section is included), so I will proceed.

NPK International Inc. (NYSE:NPKI) filed a Current Report on Form 8-K on October 29, 2026, disclosing that it issued a press release announcing financial information for the three and nine months ended September 30, 2026.

Key Highlights

  • Filing date: October 29, 2026, covering the three and nine months ended September 30, 2026.
  • Press release attached: The financial results press release is attached as Exhibit 99.1 and incorporated by reference.
  • Non-GAAP measures disclosed: The company disclosed use of Adjusted Income (Loss) from Continuing Operations, EBITDA from Continuing Operations, Adjusted EBITDA from Continuing Operations, Adjusted EBITDA Margin from Continuing Operations, and Free Cash Flow.
  • Reconciliations provided: According to the filing, reconciliations of each non-GAAP measure to the nearest GAAP measure are included in Exhibit 99.1.
  • Signed by: Gregg S. Piontek, Senior Vice President and Chief Financial Officer, as Principal Financial Officer.

NPK International Releases Third-Quarter and Nine-Month 2026 Financial Information

According to the filing, NPK International Inc. issued a press release on October 29, 2026, containing financial information for the three and nine months ended September 30, 2026. The press release is attached to the Current Report as Exhibit 99.1 and is incorporated into the filing by reference. The company is incorporated in Delaware, trades on the New York Stock Exchange under the symbol NPKI, and is headquartered at 9320 Lakeside Boulevard, Suite 100, The Woodlands, Texas 77381.

The filing notes that the information in Item 2.02 and the attached exhibit "shall not be deemed 'filed' for purposes of Section 18 of the Securities Exchange Act of 1934, as amended," nor incorporated by reference in other filings under the Securities Act of 1933 or the Exchange Act, except as expressly set forth by specific reference in such a filing.

The company also disclosed its use of several non-GAAP financial measures alongside GAAP results, including Adjusted Income (Loss) from Continuing Operations, Adjusted Income (Loss) from Continuing Operations Per Common Share, EBITDA from Continuing Operations, Adjusted EBITDA from Continuing Operations, Adjusted EBITDA Margin from Continuing Operations, and Free Cash Flow. The filing states that the company's incentive compensation plan "measures performance based on our consolidated EBITDA, along with other factors," and that these measures "should be considered in addition to, not as a substitute for, financial measures prepared in accordance with GAAP."

What Was Disclosed

NPK International Inc. filed an 8-K on October 29, 2026, attaching a press release with financial results for the three and nine months ended September 30, 2026, and describing the non-GAAP financial measures included in that release, with reconciliations provided in Exhibit 99.1.