Earnings release
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Exhibit 99.1 NPK REPORTS THIRD QUARTER 2026 RESULTS THE WOODLANDS, TEXAS – October 29, 2026 – NPK International Inc. (NYSE: NPKI) (“NPK” or the “Company”) today announced results for the three and nine months ended September 30, 2026. THIRD QUARTER 2026 RESULTS (all comparisons versus the prior year period unless otherwise noted) • Revenues of $76.3 million, +11% • Operating income from continuing operations of $9.2 million, 12.0% operating margin • Income from continuing operations of $6.3 million, or $0.07 per diluted share • Adjusted EBITDA from Continuing Operations of $20.0 million, +30% • Adjusted EBITDA margin of 26.2%, +390 basis points • Total debt of $26.3 million and cash of $4.2 million as of September 30, 2026 • Repurchased $13.4 million of common equity in the third quarter of 2026 Third Quarter (In millions) 2026 2025 Change Revenues $ 76.3 $ 68.8 $ 7.5 Operating income from continuing operations $ 9.2 $ 9.1 $ 0.1 Income from continuing operations per common share -Diluted $ 0.07 $ 0.07 $ — Adjusted EBITDA from continuing operations $ 20.0 $ 15.4 $ 4.6 Operating margin from continuing operations (%) 12.0% 13.2% -120 bps Adjusted EBITDA margin from continuing operations(%) 26.2% 22.3% 390 bps Net cash provided by operating activities $ 7.1 $ 24.7 $ (17.6) Free Cash Flow $ (4.4) $ 12.5 $ (16.9) MANAGEMENT COMMENTARY “We generated third quarter year-over-year revenue and adjusted EBITDA growth of 11% and 30%, respectively, despite delayed deployments on several large projects,” stated Matthew Lanigan, President and CEO of NPK International. “While the exceptionally dry weather in Texas negatively impacted matting demand during the third and early fourth quarter and caused us to lower our full-year guidance, the underlying demand trends in our core power transmission markets remain robust as rental project activity has significantly strengthened throughout October. As a result, we expect strong rental and service trends to finish the year and our growth expectations for 2027 remain unchanged. Lanigan continued, “We remain focused on executing our key growth initiatives, including expanding our manufacturing capacity, growing our rental fleet, and further diversifying our customer base and geographic footprint. Our manufacturing facility expansion remains on track to begin operations by mid-2027, supporting accelerated fleet growth and reducing our reliance on cross-rental mats. We also continue to evaluate organic growth opportunities and strategic acquisitions to expand our presence in new and underpenetrated markets and further increase market share. These investments reflect our confidence in the strength and long-term durability of the growth trends driving our business. 1
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“Our strong liquidity position provides us the flexibility to balance our growth investments with the return of capital through our disciplined share repurchase program. During the third quarter, we invested $13 million in share repurchases, leaving $76 million remaining under our current share repurchase authorization. With debt of $26 million at quarter end and roughly $132 million of availability under our bank facility, we have ample financial capacity to support both our strategic growth investments, as well as opportunistic share repurchases. “Our quoting activity has remained robust, maintaining year-over-year growth of approximately 20% throughout the year, demonstrating the strong fundamental demand trends benefitting our business. We believe our strategic investments position us well to capitalize on these attractive growth opportunities, which combined with our consistent operational execution, give us confidence in our ability to deliver double-digit rental growth in the coming years. We are excited about the opportunities ahead and remain focused on capitalizing on favorable market trends, executing our growth strategy and delivering long-term value for our shareholders,” concluded Lanigan BUSINESS UPDATE 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 2026 highlights include: • Consistent customer demand from core markets. Business activity remains robust in core markets, driven by sustained demand from power transmission customers. Quoting activity remains consistent at elevated levels, with year-over-year growth of at least 20% throughout 2026, with much of the volume being originated in expansion geographies. This supports the Company’s longer-term expectation for double-digit rental growth. • Improved operating efficiency. NPK remains focused on efficiency improvements and operating cost optimization across every aspect of its business. In the third quarter of 2026, NPK’s Adjusted EBITDA Margin was 26.2%, a 390 basis point improvement from the prior year period. • Manufacturing capacity expansion. Based on the continued favorable long-term demand outlook, NPK continues to execute on plans to expand our Carencro, Louisiana manufacturing capacity by approximately 50% from current levels. The Company expects to invest $40 million to $45 million by mid-2027, including $10.5 million invested through September 30, 2026, with additional production expected to start up by mid- 2027. • Robust return of capital program. During the third quarter of 2026, the Company used $13.4 million of cash to repurchase 1.0 million outstanding shares under the repurchase program. The Company has $76 million remaining under the current share repurchase authorization. FINANCIAL PERFORMANCE In the third quarter of 2026, NPK generated revenue of $76.3 million, an increase of 11%, compared to $68.8 million in the prior year period. Rental and service revenue increased 12% to $49.6 million, while product sales increased 9% to $26.7 million. Rental demand in the third quarter of 2026 was impacted by an exceptionally dry weather pattern in Texas, which resulted in several scheduled large-scale utility projects commencing without the use of matting. The revenue decline in the Texas region was partially offset by growth in other targeted expansion markets. Gross margin was 31.3% in the third quarter of 2026, compared to 31.9% in the prior year period. 2
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Selling, general and administrative expenses were $14.7 million (19.3% of revenues) in the third quarter of 2026, compared to $13.3 million (19.3% of revenues) in the third quarter of 2025. SG&A for the third quarter of 2026 includes approximately $1.2 million in severance and related costs associated with executive leadership transition, as well as $0.7 million in strategic planning and diligence costs. NPK generated income from continuing operations of $6.3 million, or $0.07 per diluted share, compared to $6.1 million, or $0.07 per diluted share, in the third quarter of 2025. Third quarter 2026 adjusted income from continuing operations was $7.9 million, or $0.09 per diluted share, compared to adjusted income from continuing operations of $6.1 million, or $0.07 per diluted share, in the third quarter of 2025. The Company reported Adjusted EBITDA from Continuing Operations of $20.0 million in the third quarter of 2026, or 26.2% of total revenue, compared to $15.4 million, or 22.3% of total revenue, in the prior year period. BALANCE SHEET AND LIQUIDITY As of September 30, 2026, NPK had total cash of $4.2 million, total debt of $26.3 million, and available liquidity under its senior secured revolving credit facility of $132.2 million. Operating cash flow was $7.1 million in the third quarter of 2026, and capital investments used $11.4 million, net, with the substantial majority funding the growth of the mat rental fleet and the manufacturing expansion project. FINANCIAL GUIDANCE The following forward-looking guidance reflects the Company’s current expectations and beliefs as of October 29, 2026, 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 2026, NPK currently anticipates the following: • Revenues in a range of $300 million to $305 million • Adjusted EBITDA in a range of $90 million to $93 million • Capital expenditures in a range of $70 million to $75 million, which includes $40 million to $45 million invested to expand our rental fleet and approximately $20 million for the manufacturing expansion THIRD QUARTER 2026 RESULTS CONFERENCE CALL A conference call will be held Friday, October 30, 2026 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 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: Domestic Live: 833-461-5787 International Live: 585-542-9983 Conference ID: 336 340 669 After the webcast, a replay will be available on the Company’s website. 3
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ABOUT NPK INTERNATIONAL NPK International Inc. is a 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 npki.com. FORWARD-LOOKING STATEMENTS 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 ability to generate organic growth; economic and market conditions that may impact our customers’ future spending; customer concentration; the effective management of our fleet, including our ability to properly manufacture, safeguard, and maintain our fleet; international operations; manufacturing capacity expansion projects; 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; complications with the design or implementation of our updated enterprise resource planning system; 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 sec.gov, as well as through our website at npki.com. INVESTOR RELATIONS CONTACT Investors@npki.com 4
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NPK International Inc. Condensed Consolidated Statements of Operations (Unaudited) Three Months Ended Nine Months Ended (In thousands, except per share data) September 30,2026 June 30, 2026 September 30,2025 September 30,2026 September 30,2025 Revenues $ 76,276 $ 81,585 $ 68,838 $ 232,931 $ 201,848 Cost of revenues 52,371 51,426 46,870 151,681 129,449 Selling, general and administrativeexpenses 14,738 14,160 13,279 42,089 38,682 Other operating (income) loss, net 8 (91) (368) (511) (497) Operating income from continuingoperations 9,159 16,090 9,057 39,672 34,214 Foreign currency exchange (gain) loss 101 (154) 31 92 (909) Interest (income) expense, net 460 347 (47) 1,130 (94) Income from continuing operationsbefore income taxes 8,598 15,897 9,073 38,450 35,217 Provision for income taxes from continuingoperations 2,268 3,908 3,010 9,773 9,995 Income from continuing operations 6,330 11,989 6,063 28,677 25,222 Loss from discontinued operations, netof tax (221) (22) (409) (143) (887) Net income $ 6,109 $ 11,967 $ 5,654 $ 28,534 $ 24,335 Income (loss) per common share - basic Income from continuing operations $ 0.07 $ 0.14 $ 0.07 $ 0.34 $ 0.30 Loss from discontinued operations — — — — (0.01) Net income (loss) $ 0.07 $ 0.14 $ 0.07 $ 0.34 $ 0.29 Income (loss) per common share - diluted Income from continuing operations $ 0.07 $ 0.14 $ 0.07 $ 0.33 $ 0.29 Loss from discontinued operations — — — — (0.01) Net income $ 0.07 $ 0.14 $ 0.07 $ 0.33 $ 0.28 Weighted average shares: Basic 84,420 84,526 84,359 84,454 84,959 Diluted 85,372 85,844 85,066 85,688 85,821 5
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NPK International Inc. Operating Results (Unaudited) Three Months Ended Nine Months Ended (In thousands) September 30,2026 June 30, 2026 September 30,2025 September 30,2026 September 30,2025 Revenues Rental revenues $ 31,840 $ 37,208 $ 29,591 $ 104,673 $ 89,355 Service revenues 17,724 16,344 14,688 50,396 44,629 Product sales revenues 26,712 28,033 24,559 77,862 67,864 Total revenues $ 76,276 $ 81,585 $ 68,838 $ 232,931 $ 201,848 Operating income fromcontinuing operations $ 9,159 $ 16,090 $ 9,057 $ 39,672 $ 34,214 Operating margin fromcontinuing operations 12.0 % 19.7 % 13.2 % 17.0 % 17.0 % 6
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NPK International Inc. Condensed Consolidated Balance Sheets (Unaudited) (In thousands, except share data) September 30,2026 December 31,2025 ASSETS Cash and cash equivalents $ 4,230 $ 5,140 Receivables, net 65,735 59,806 Inventories 16,417 11,500 Prepaid expenses and other current assets 6,947 5,046 Total current assets 93,329 81,492 Property, plant and equipment, net 257,058 233,048 Operating lease assets 11,573 11,195 Goodwill 75,914 76,341 Other intangible assets, net 17,525 21,297 Deferred tax assets 1,558 5,535 Other assets 8,682 12,850 Total assets $ 465,639 $ 441,758 LIABILITIES AND STOCKHOLDERS’ EQUITY Current debt $ 5,067 $ 5,170 Accounts payable 23,353 22,327 Accrued liabilities 27,175 29,647 Total current liabilities 55,595 57,144 Long-term debt, less current portion 21,229 11,692 Noncurrent operating lease liabilities 9,778 9,877 Deferred tax liabilities 11,039 7,476 Other noncurrent liabilities 1,908 4,413 Total liabilities 99,549 90,602 Common stock, $0.01 par value (200,000,000 shares authorized and 89,969,464 and90,134,477 shares issued, respectively) 900 902 Paid-in capital 489,664 489,632 Accumulated other comprehensive loss (2,716) (1,610) Retained earnings (deficit) (71,993) (100,527) Treasury stock, at cost (6,046,343 and 5,616,798 shares, respectively) (49,765) (37,241) Total stockholders’ equity 366,090 351,156 Total liabilities and stockholders’ equity $ 465,639 $ 441,758 7
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NPK International Inc. Condensed Consolidated Statements of Cash Flows (Unaudited) Nine Months Ended September 30, (In thousands) 2026 2025 Cash flows from operating activities: Net income $ 28,534 $ 24,335 Adjustments to reconcile net income to net cash provided by operations: Gain on divestitures (500) — Depreciation and amortization 25,404 18,235 Stock-based compensation expense 6,154 4,137 Provision for deferred income taxes 7,697 9,362 Credit loss expense 95 19 Gain on sale of assets (1,261) (2,203) Amortization of original issue discount and debt issuance costs 237 394 Change in assets and liabilities: Increase in receivables (7,558) (2,462) (Increase) decrease in inventories (4,790) 5,007 Increase in other assets (3,119) (3,711) Increase in accounts payable 2,425 1,466 Increase (decrease) in accrued liabilities and other (3,172) 405 Net cash provided by operating activities 50,146 54,984 Cash flows from investing activities: Capital expenditures (45,519) (34,419) Proceeds from divestitures 5,490 14,485 Proceeds from sale of property, plant and equipment 1,811 3,819 Other investing activities (627) 3,089 Net cash used in investing activities (38,845) (13,026) Cash flows from financing activities: Borrowings on lines of credit 49,100 — Payments on lines of credit (38,500) — Debt issuance costs — (811) Purchases of treasury stock (19,330) (22,695) Proceeds from employee stock plans 528 1,497 Other financing activities (3,979) (2,639) Net cash used in financing activities (12,181) (24,648) Effect of exchange rate changes on cash (30) 91 Net increase (decrease) in cash, cash equivalents, and restricted cash (910) 17,401 Cash, cash equivalents, and restricted cash at beginning of period 5,140 18,237 Cash, cash equivalents, and restricted cash at end of period $ 4,230 $ 35,638 8
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NPK International Inc. Non-GAAP Reconciliations (Unaudited) To help understand the Company’s financial performance, the Company has supplemented its financial results that it provides in accordance with generally accepted accounting principles (“GAAP”) with non-GAAP financial measures. Such financial measures include Adjusted Income from Continuing Operations, Adjusted Income from Continuing Operations Per Common Share, earnings before interest, taxes, depreciation and amortization (“EBITDA”) from Continuing Operations, Adjusted EBITDA from Continuing Operations, Adjusted EBITDA Margin from Continuing Operations, and Free Cash Flow. 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. Adjusted Income from Continuing Operations and Adjusted Income from Continuing Operations Per Common Share 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: Consolidated Three Months Ended Nine Months Ended (In thousands) September 30,2026 June 30, 2026 September 30,2025 September 30,2026 September 30,2025 Income from continuing operations(GAAP) $ 6,330 $ 11,989 $ 6,063 $ 28,677 $ 25,222 Strategic planning, diligence, andacquisition-related costs 719 — — 751 — Modification of retirement terms — 858 — 858 — Plant expansion expenses 107 226 — 333 — Severance and related costs 1,210 — 69 1,210 455 Tax on adjustments (428) (228) (14) (662) (96) Adjusted Income from ContinuingOperations (non-GAAP) $ 7,938 $ 12,845 $ 6,118 $ 31,167 $ 25,581 Adjusted Income from ContinuingOperations (non-GAAP) $ 7,938 $ 12,845 $ 6,118 $ 31,167 $ 25,581 Weighted average common sharesoutstanding - basic 84,420 84,526 84,359 84,454 84,959 Dilutive effect of restricted stockawards and stock options 952 1,318 707 1,234 862 Weighted average common sharesoutstanding - diluted 85,372 85,844 85,066 85,688 85,821 Adjusted Income from ContinuingOperations Per Common Share -Diluted (non-GAAP): $ 0.09 $ 0.15 $ 0.07 $ 0.36 $ 0.30 9
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NPK International Inc. Non-GAAP Reconciliations (Continued) (Unaudited) EBITDA from Continuing Operations, Adjusted EBITDA from Continuing Operations, and Adjusted EBITDA Margin from Continuing Operations 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: Consolidated Three Months Ended Nine Months Ended (In thousands) September 30,2026 June 30, 2026 September 30,2025 September 30,2026 September 30,2025 Revenues $ 76,276 $ 81,585 $ 68,838 $ 232,931 $ 201,848 Operating income from continuingoperations (GAAP) $ 9,159 $ 16,090 $ 9,057 $ 39,672 $ 34,214 Income from continuing operations(GAAP) $ 6,330 $ 11,989 $ 6,063 $ 28,677 $ 25,222 Interest (income) expense, net 460 347 (47) 1,130 (94) Provision for income taxes fromcontinuing operations 2,268 3,908 3,010 9,773 9,995 Depreciation and amortization 8,859 8,378 6,261 25,404 18,235 EBITDA from ContinuingOperations (non-GAAP) 17,917 24,622 15,287 64,984 53,358 Strategic planning, diligence, andacquisition-related costs 719 — — 751 — Modification of retirement terms — 858 — 858 — Plant expansion expenses 107 226 — 333 — Severance and related costs 1,210 — 69 1,210 455 Adjusted EBITDA from ContinuingOperations (non-GAAP) $ 19,953 $ 25,706 $ 15,356 $ 68,136 $ 53,813 Operating Margin from ContinuingOperations (GAAP) 12.0 % 19.7 % 13.2 % 17.0 % 17.0 % Adjusted EBITDA Margin fromContinuing Operations (non-GAAP) 26.2 % 31.5 % 22.3 % 29.3 % 26.7 % Free Cash Flow 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: Consolidated Three Months Ended Nine Months Ended (In thousands) September 30,2026 June 30, 2026 September 30,2025 September 30,2026 September 30,2025 Net cash provided by operatingactivities (GAAP) $ 7,119 $ 21,916 $ 24,716 $ 50,146 $ 54,984 Capital expenditures (12,304) (16,531) (12,714) (45,519) (34,419) Proceeds from sale of property, plantand equipment 792 536 499 1,811 3,819 Free Cash Flow (non-GAAP) $ (4,393) $ 5,921 $ 12,501 $ 6,438 $ 24,384 10
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NPK International Inc. Non-GAAP Reconciliations (Continued) (Unaudited) Trailing Twelve Months (“TTM”) Consolidated Three Months Ended TTM (In thousands) December 31,2025 March 31,2026 June 30, 2026 September 30,2026 September 30,2026 Revenues $ 75,195 $ 75,070 $ 81,585 $ 76,276 $ 308,126 Operating income from continuingoperations (GAAP) $ 12,565 $ 14,423 $ 16,090 $ 9,159 $ 52,237 Income from continuing operations(GAAP) $ 10,723 $ 10,358 $ 11,989 $ 6,330 $ 39,400 Interest (income) expense, net 107 323 347 460 1,237 Provision (benefit) for income taxes fromcontinuing operations 1,710 3,597 3,908 2,268 11,483 Depreciation and amortization 7,302 8,167 8,378 8,859 32,706 EBITDA from Continuing Operations(non-GAAP) 19,842 22,445 24,622 17,917 84,826 Strategic planning, diligence, andacquisition-related costs 1,088 32 — 719 1,839 Modification of retirement terms — — 858 — 858 Plant expansion expenses — — 226 107 333 Severance and related costs 763 — — 1,210 1,973 Adjusted EBITDA from ContinuingOperations (non-GAAP) $ 21,693 $ 22,477 $ 25,706 $ 19,953 $ 89,829 Operating Margin from ContinuingOperations (GAAP) 16.7 % 19.2 % 19.7 % 12.0 % 17.0 % Adjusted EBITDA Margin fromContinuing Operations (non-GAAP) 28.8 % 29.9 % 31.5 % 26.2 % 29.2 % 11