NPK REPORTS THIRD QUARTER 2025 RESULTS

THE WOODLANDS, TEXAS – October 30, 2025 – NPK International Inc. (NYSE: NPKI) (“NPK” or the “Company”) today announced results for the three and nine months ended September 30, 2025.

•Revenues of $68.8 million, +56%; Rental revenues of $29.6 million, +57%

•Operating income from continuing operations of $9.1 million, 13.2% operating margin

•Income from continuing operations of $6.1 million, or $0.07 per diluted share

•Adjusted EBITDA from Continuing Operations of $15.4 million, 22.3% Adjusted EBITDA margin

•Total cash of $35.6 million and total debt of $9.5 million as of September 30, 2025

•Cash flow from operating activities of $24.7 million; Free Cash Flow of $12.5 million

“We delivered strong third-quarter results, with revenue increasing by 56%, driven by sustained demand growth in the power transmission market, and exceptional execution by our commercial sales and operational teams serving the largest and most complex utility projects,” said Matthew Lanigan, President and CEO of NPK. “Given the strengthening market outlook, we are raising our full-year capital expenditure plan by $10 million to align with expected demand growth in 2026 and have also accelerated planning efforts to expand our manufacturing capacity to support long-term growth.”

Lanigan continued, “One of our key competitive advantages is the scale and flexibility of our rental fleet, which enables us to respond rapidly to evolving customer needs. This advantage was again clearly demonstrated late in the quarter, as we successfully met customer demand for multiple large-scale project changes and extensions. While these short-notice changes introduced some operational inefficiencies and modest margin pressure in the quarter, our responsiveness further solidifies our customer relationships and market leadership while our full year and longer-term outlook for mid-30’s gross margin remains unchanged.”

“We remain in a strong financial position, with cash and available liquidity of nearly $180 million as of September 30, 2025, giving us significant flexibility to support our balanced capital allocation strategy and fund our growth initiatives,” Lanigan added. “Year-to-date, we have expanded our rental fleet by 13%, and our recent debottlenecking efforts have resulted in a 5% increase in production output — both critical steps toward supporting continued growth and enhancing operational efficiency.”

“We’re extremely proud of our performance through the first nine months of 2025, which reflects the dedication and hard work of our entire team,” Lanigan concluded. “We ended Q3 with record utilization levels, setting the stage for a strong finish to the year. As a result, we are raising our full-year financial guidance. We remain focused on executing our strategic priorities and are energized by the opportunities ahead.”

NPK’s business plan is designed to drive organic commercial growth within targeted, higher-margin product and rental markets; improve asset optimization and organizational efficiency; and pursue a capital allocation strategy that prioritizes investments with superior return profiles, together with a programmatic return of capital program.

Third quarter 2025 highlights include:

•Strong customer demand continued for matting rental and related services. Revenues from specialty rental and related services were $44 million in the third quarter of 2025, with strong demand continuing in support of power transmission projects throughout the typically softer summer months. Revenues from product sales were $25 million for the third quarter of 2025, the Company’s strongest quarter of the year, primarily reflecting continued strength in demand from utility companies.

•Improved operating efficiency. NPK remains focused on efficiency improvements and operating cost optimization across every aspect of its business. The Company continues to evaluate and execute actions intended to streamline the organization and its cost structure, while targeting SG&A as a percentage of revenue in the mid-teens by early 2026. During the third quarter of 2025, the Company began the rollout of a new cloud-based ERP system, which is expected to be substantially completed in the first quarter of 2026. In the third quarter of 2025, NPK’s SG&A as a percentage of revenue was 19.3%, which includes approximately $1 million in elevated costs related to performance-based incentives, along with $0.5 million in costs associated with strategic planning projects and the ERP rollout. The expense for performance-based incentives includes both long-term awards measured on the Company’s total shareholder return (“TSR”) relative to the designated peer group, as well as annual incentives tied to 2025 sales, profitability and other performance targets.

•Robust return of capital program. During the third quarter of 2025, the Company used $3.4 million of cash to repurchase 0.4 million outstanding shares under the repurchase program.

In the third quarter of 2025, NPK generated income from continuing operations of $6.1 million, or $0.07 per diluted share, on total revenue of $68.8 million, compared to $14.9 million, or $0.17 per diluted share, on total revenue of $44.2 million, in the third quarter of 2024. Income from continuing operations for the third quarter of 2024 included an income tax benefit of $14.6 million primarily reflecting the release of valuation allowances on U.S. net operating losses and other tax credit carryforwards following the sale of the Fluids Systems business. Gross margin was 31.9% in the third quarter of 2025, compared to 27.5% in the prior year period. The Company reported Adjusted EBITDA from Continuing Operations of $15.4 million in the third quarter of 2025, or 22.3% of total revenue, compared to $7.5 million, or 17.0% of total revenue, in the prior year period.

Selling, general and administrative expenses were $13.3 million (19.3% of revenues) in the third quarter of 2025, compared to $11.0 million (24.9% of revenues) in the third quarter of 2024.

As of September 30, 2025, NPK remained in a net cash positive position, with total cash of $35.6 million, total debt of $9.5 million, and available liquidity under its senior secured revolving credit facility of $144 million.

Operating cash flow was $24.7 million in the third quarter of 2025. Capital investments used $12.2 million, net, primarily funding the expansion of the mat rental fleet to support increased customer demand, while $3.4 million was used to fund purchases under our repurchase program.

The following forward-looking guidance reflects the Company’s current expectations and beliefs as of October 30, 2025, and is subject to change. The following statements apply only as of the date of this disclosure and are expressly qualified in their entirety by the cautionary statements included elsewhere in this document.

For the full year 2025, NPK currently anticipates the following:

•Revenues in a range of $268 million to $272 million

•Adjusted EBITDA in a range of $71 million to $74 million

•Capital expenditures in a range of $45 million to $50 million

A conference call will be held Friday, October 31, 2025 at 9:30 a.m. ET to review the Company’s financial results and conduct a question-and-answer session.

A webcast of the conference call will be available in the Investor Relations section of the Company’s website at www.npki.com. Individuals can also participate by teleconference dial-in. To listen to a live broadcast, go to the site at least 15 minutes prior to the scheduled start time in order to register, download and install any necessary audio software.

To participate in the live teleconference:

To listen to a replay of the teleconference, which subsequently will be available through November 7, 2025:

NPK International Inc. is a temporary worksite access solutions company that manufactures, sells, and rents recyclable composite matting products, along with a full suite of services, including planning, logistics, and site restoration. The Company delivers superior quality and reliability across critical infrastructure markets, including electrical transmission and distribution, oil and gas exploration, pipeline, renewable energy, petrochemical, construction, and other industries.

For more information, visit our website at www.npki.com.

This news release contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, as amended. All statements other than statements of historical facts are forward-looking statements. Words such as “will,” “may,” “could,” “would,” “should,” “anticipates,” “believes,” “estimates,” “expects,” “plans,” “intends,” “guidance,” and similar expressions are intended to identify these forward-looking statements but are not the exclusive means of identifying them. These statements are not guarantees that our expectations will prove to be correct and involve a number of risks, uncertainties, and assumptions. Many factors, including those discussed more fully elsewhere in this release and in documents filed with the Securities and Exchange Commission by NPK, particularly its Annual Report on Form 10-K, and its Quarterly Reports on Form 10-Q, as well as others, could cause actual plans or results to differ materially from those expressed in, or implied by, these statements. These risk factors include, but are not limited to, risks related to our sale of the Fluids Systems business; our ability to generate organic growth; economic and market conditions that may impact our customers’ future spending; the effective management of our fleet, including our ability to properly manufacture, safeguard, and maintain our fleet; international operations; operating hazards present in our and our customers’ industries and substantial liability claims; our contracts that can be terminated or downsized by our customers without penalty; our product offering and market expansion; our ability to attract, retain, and develop qualified leaders, key employees, and skilled personnel; expanding our services in the utilities sector, which may require unionized labor; the price and availability of raw materials; inflation; capital investments and business acquisitions; market competition; technological developments and intellectual property; severe weather, natural disasters, and seasonality; public health crises, epidemics, and pandemics; our cost and continued availability of borrowed funds, including noncompliance with debt covenants; environmental laws and regulations; legal compliance; the inherent limitations of insurance coverage; income taxes; cybersecurity incidents or business system disruptions; activist stockholders that may attempt to effect changes at our Company or acquire control over our Company; share repurchases; and our amended and restated bylaws, which could limit our stockholders’ ability to obtain what such stockholders believe to be a favorable judicial forum for disputes with us or our directors, officers or other employees. We assume no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by securities laws. NPK’s filings with the Securities and Exchange Commission can be obtained at no charge at www.sec.gov, as well as through our website at www.npki.com.

Investors@npki.com

We believe these non-GAAP financial measures are frequently used by investors, securities analysts and other parties in the evaluation of our performance and liquidity with that of other companies in our industry. Management uses these measures to evaluate our operating performance, liquidity and capital structure. In addition, our incentive compensation plan measures performance based on our consolidated EBITDA, along with other factors. The methods we use to produce these non-GAAP financial measures may differ from methods used by other companies. These measures should be considered in addition to, not as a substitute for, financial measures prepared in accordance with GAAP.

The following tables reconcile the Company’s income from continuing operations and income from continuing operations per common share calculated in accordance with GAAP to the non-GAAP financial measures of Adjusted Income from Continuing Operations and Adjusted Income from Continuing Operations Per Common Share:

(1) Unusual tax items primarily reflects the release of valuation allowances on U.S. net operating losses and other tax credit carryforwards that are expected to be realized following the sale of the Fluids Systems business.

The following table reconciles the Company’s income from continuing operations calculated in accordance with GAAP to the non-GAAP financial measures of EBITDA from Continuing Operations, Adjusted EBITDA from Continuing Operations, and Adjusted EBITDA Margin from Continuing Operations:

The following table reconciles the Company’s net cash provided by operating activities calculated in accordance with GAAP to the non-GAAP financial measure of Free Cash Flow:

###