Exhibit 99.1

Huntsman Announces Second Quarter 2026 Earnings

Second Quarter Highlights

See end of press release for footnote explanations and reconciliations of non-GAAP measures.              

THE WOODLANDS, Texas – Huntsman Corporation (NYSE: HUN) today reported second quarter 2026 results with revenues of $1,663 million, net loss attributable to Huntsman of $6 million, adjusted net income attributable to Huntsman of nil and adjusted EBITDA of $120 million.

Peter R. Huntsman, Chairman, President, and CEO, commented:

“We delivered a solid quarter, supported by higher volumes across all three segments and pricing actions that offset a significant increase in raw material costs. Improved industrial demand helped counter continued softness in construction. Rising and volatile energy and crude oil related costs, particularly in Europe, remain a headwind, and we will stay focused on additional price increases and cost-reduction initiatives to help offset these pressures.

Our planned merger of equals with Olin Corporation continues to progress at pace. The strong collaboration between our teams reinforces my confidence in our ability to deliver the synergy targets we have outlined. We also expect the combined company to benefit from vertical integration, greater scale, and a stronger financial profile, creating meaningful value for shareholders of both companies. The stockholder vote is scheduled for August 25, 2026, and we are excited about the future of OlinHuntsman.”

Segment Analysis for 2Q26 Compared to 2Q25

Polyurethanes

The increase in revenues in our Polyurethanes segment for the three months ended June 30, 2026 compared to the same period of 2025 was primarily due to higher average selling prices and higher sales volumes. MDI average selling prices increased across all three regions due to improved supply and demand dynamics. MDI sales volumes increased in the Americas and Europe regions. The increase in segment adjusted EBITDA was primarily due to higher average selling prices, higher sales volumes, higher equity earnings from our minority-owned joint venture in China and cost savings achieved from our cost optimization program, partially offset by higher raw materials costs.

Performance Products

The increase in revenues in our Performance Products segment for the three months ended June 30, 2026 compared to the same period of 2025 was primarily due to higher sales volumes and slightly higher average selling prices. Sales volumes increased primarily due to favorable demand in our performance amines business. Average selling prices increased primarily due to higher raw materials costs. The increase in segment adjusted EBITDA was primarily due to higher sales volumes and lower fixed costs achieved from our cost optimization program.

Advanced Materials

The increase in revenues in our Advanced Materials segment for the three months ended June 30, 2026 compared to the same period of 2025 was primarily due to higher average selling prices and higher sales volumes. Average selling prices increased primarily due to favorable sales mix and the positive impact of major foreign currency exchange rate movements against the U.S. dollar. Sales volumes increased primarily in our aerospace, power and automotive markets. The increase in segment adjusted EBITDA was primarily due to higher margins and higher sales volumes.

Liquidity and Capital Resources

During the three months ended June 30, 2026, our free cash flow used was $90 million as compared to a source of cash of $55 million in the same period of 2025. As of June 30, 2026, we had approximately $0.9 billion of combined cash and unused borrowing capacity.

During the three months ended June 30, 2026, we spent $30 million on capital expenditures as compared to $37 million in the same period of 2025. During 2026, we expect capital expenditures to be approximately $170 million.

Income Taxes

In the second quarter of 2026, our effective tax rate was 65% and our adjusted effective tax rate was 61%.

Earnings Conference Call Information

We will hold a conference call to discuss our second quarter 2026 financial results on Friday, July 31, 2026, at 10:00 a.m. ET.

Webcast link: https://event.choruscall.com/mediaframe/webcast.html?webcastid=r4UuXqgQ

Participant dial-in numbers:

The conference call will be accompanied by presentation slides that will be accessible via the webcast link and Huntsman’s investor relations website, www.huntsman.com/investors. Upon conclusion of the call, the webcast replay will be accessible via Huntsman’s website.

Upcoming Conferences 

During the third quarter 2026, a member of management is expected to present at: 

Seaport Summer Investor Conference, August 18, 2026 

UBS Conference, September 9, 2026 

Jefferies Industrials Conference, September 10, 2026 

Alembic Conference, September 14, 2026 

Deutsche Bank Leveraged Finance Conference, September 28, 2026

A webcast of the presentation, if applicable, along with accompanying materials will be available at www.huntsman.com/investors.

Table 1 – Results of Operations

See end of press release for footnote explanations.                                

Table 2 -- Results of Operations by Segment

N/M = not meaningful

See end of press release for footnote explanations.

Table 3 -- Factors Impacting Sales Revenue

Table 4 – Reconciliation of U.S. GAAP to Non-GAAP Measures

N/M = not meaningful

N/A = not applicable

See end of press release for footnote explanations.

Table 5 – Balance Sheets

See end of press release for footnote explanations.

Table 6 – Outstanding Debt

See end of press release for footnote explanations.

Table 7 – Summarized Statements of Cash Flows

Footnotes

Adjusted EBITDA, adjusted net income (loss) and adjusted diluted income (loss) per share, as used herein, are not necessarily comparable to other similarly titled measures of other companies.

Adjusted EBITDA is computed by eliminating the following from net income (loss): (a) net income attributable to noncontrolling interests; (b) interest expense, net; (c) income taxes; (d) depreciation and amortization; (e) amortization of pension and postretirement actuarial losses; (f) restructuring, impairment and plant closing and transition costs; and further adjusted for certain other items set forth in the reconciliation of net income (loss) to adjusted EBITDA in Table 4 above.

Adjusted net income (loss) and adjusted diluted income (loss) per share are computed by eliminating the after tax impact of the following items from net income (loss): (a) net income attributable to noncontrolling interests; (b) amortization of pension and postretirement actuarial losses; (c) restructuring, impairment and plant closing and transition costs; and further adjusted for certain other items set forth in the reconciliation of net income (loss) to adjusted net income (loss) in Table 4 above. The income tax impacts, if any, of each adjusting item represent a ratable allocation of the total difference between the unadjusted tax expense and the total adjusted tax expense, computed without consideration of any adjusting items using a with and without approach.

We may disclose forward-looking adjusted EBITDA because we cannot adequately forecast certain items and events that may or may not impact us in the near future, such as business acquisition and integration expenses and purchase accounting inventory adjustments, net, certain legal and other settlements and related expenses, gains on sale of businesses/assets and certain tax only items, including tax law changes not yet enacted. Each of such adjustment has not yet occurred, is out of our control and/or cannot be reasonably predicted. In our view, our forward-looking adjusted EBITDA represents the forecast net income on our underlying business operations but does not reflect any adjustments related to the items noted above that may occur and can cause our adjusted EBITDA to differ.

About Huntsman:

Huntsman Corporation is a publicly traded global manufacturer and marketer of diversified chemical products with 2025 revenues of approximately $6 billion from our continuing operations. Our chemical products number in the thousands and are sold worldwide to manufacturers serving a broad and diverse range of consumer and industrial end markets. We operate more than 55 manufacturing, R&D and operations facilities in approximately 25 countries and employ approximately 6,000 associates within our continuing operations. For more information about Huntsman, please visit the company's website at www.huntsman.com.

Social Media:

X: http://www.x.com/Huntsman_Corp
Facebook: www.facebook.com/huntsmancorp
LinkedIn: www.linkedin.com/company/huntsman

Forward-Looking Statements:

This press release includes "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. These forward-looking statements include statements concerning our plans, objectives, goals, strategies, future events, future revenue or performance, capital expenditures, financing needs, plans or intentions relating to acquisitions, divestitures or strategic transactions, including the planned merger of equals with Olin Corporation, statements about the anticipated benefits of the contemplated transaction, including future expected synergies and cost savings related to the contemplated transaction, the plans, objectives, expectations and intentions of Olin, Huntsman or the combined company business trends and any other information that is not historical information. When used in this press release, the words "estimates," "expects," "anticipates," "likely," "projects," "outlook," "plans," "intends," "believes," "forecasts," or future or conditional verbs, such as "will," "should," "could" or "may," and variations of such words or similar expressions are intended to identify forward-looking statements. These forward-looking statements, including, without limitation, management's examination of historical operating trends and data, are based upon our current expectations and various assumptions and beliefs. In particular, such forward-looking statements are subject to uncertainty and changes in circumstances and involve risks and uncertainties that may affect the Company's operations, markets, products, prices and other factors as discussed in the Company's filings with the Securities and Exchange Commission (the "SEC"). Significant risks and uncertainties may relate to, but are not limited to, uncertainties as to the timing of the contemplated merger; uncertainties as to the approval of Huntsman's stockholders and Olin's shareholders required in connection with the contemplated merger; the possibility that the closing conditions to the contemplated merger may not be satisfied or waived, including that a governmental entity may prohibit, delay or refuse to grant a necessary regulatory approval; the effects of disruption caused by the announcement of the contemplated merger making it more difficult to maintain relationships with employees, customers, vendors and other business partners; the risk that stockholder litigation in connection with the contemplated merger may affect the timing or occurrence of the contemplated merger or result in significant costs of defense, indemnification and liability; ability to refinance existing indebtedness of Huntsman in connection with the contemplated merger; other business effects, including the effects of industry, economic or political conditions outside of the control of the parties to the contemplated merger; transaction costs, high energy costs in Europe, inflation and high capital costs, geopolitical instability, volatile global economic conditions, cyclical and volatile product markets, disruptions in production at manufacturing facilities, reorganization or restructuring of the Company's operations, including any delay of, or other negative developments affecting the ability to implement cost reductions and manufacturing optimization improvements in the Company's businesses and to realize anticipated cost savings, and other financial, operational, economic, competitive, environmental, political, legal, regulatory and technological factors. Any forward-looking statement should be considered in light of the risks set forth under the caption "Risk Factors" in our Annual Report on Form 10-K for the year ended December 31, 2025, which may be supplemented by other risks and uncertainties disclosed in any subsequent reports filed or furnished by the Company from time to time. All forward-looking statements apply only as of the date made. Except as required by law, the Company undertakes no obligation to update or revise forward-looking statements to reflect events or circumstances that arise after the date made or to reflect the occurrence of unanticipated events.

Additional Information and Where to Find It

This release may be deemed to be solicitation material in respect of the proposed transaction between Olin Corporation (“Olin”) and Huntsman Corporation (“Huntsman”). In connection with the proposed transaction, Olin and Huntsman have filed and intend to file relevant materials with the United States Securities and Exchange Commission (the “SEC”), including, among other filings, an Olin registration statement on Form S-4, as filed on July 2, 2026 and as amended on July 10, 2026 (the “Form S-4”), in connection with the proposed issuance of shares of Olin’s common stock pursuant to the proposed transaction, which Form S-4 contains a joint proxy statement/prospectus of Olin and Huntsman. The registration statement was declared effective by the SEC on July 13, 2026 and Olin filed a prospectus and each of Olin and Huntsman filed a definitive proxy statement, respectively, and commenced mailing the definitive joint proxy statement/prospectus on July 13, 2026 to each of the shareholders of Olin and stockholders of Huntsman entitled to vote on their respective transaction-related proposals at the respective special meetings. INVESTORS AND STOCKHOLDERS OF OLIN AND HUNTSMAN ARE URGED TO READ ALL RELEVANT DOCUMENTS FILED WITH THE SEC IN THEIR ENTIRETY, INCLUDING THE REGISTRATION STATEMENT AND THE DEFINITIVE JOINT PROXY STATEMENT/PROSPECTUS, AS EACH MAY BE AMENDED OR SUPPLEMENTED FROM TIME TO TIME, BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION, THE PARTIES TO THE PROPOSED TRANSACTION AND ANY SOLICITATION. This release is not a substitute for the registration statement, the definitive joint proxy statement/prospectus or any other document that Olin or Huntsman may file with the SEC and send to their respective shareholders and stockholders in connection with the proposed transaction. Investors and securityholders will be able to obtain free copies of the registration statement and the definitive joint proxy statement/prospectus, as each may be amended or supplemented from time to time, and other relevant documents filed with the SEC by Olin and Huntsman from the SEC’s website at http://www.sec.gov, on Olin’s website at https://olin.com under the tab “Investors” and under the heading “SEC Filings” and on Huntsman’s website at https://www.huntsman.com under the tab “Investors” and under the heading “Financials” and subheading “SEC filings.”

Participants in the Solicitation

Olin, Huntsman, their respective directors, executive officers and certain other members of management and employees, under SEC rules, may be deemed to be “participants” in the solicitation of proxies from Olin’s shareholders and Huntsman’s stockholders in connection with the proposed transaction. Information about Olin’s directors and executive officers is set forth in Olin’s Proxy Statement on Schedule 14A for its 2026 Annual Meeting of shareholders, which was filed with the SEC on March 20, 2026, its Annual Report on Form 10-K for the year ended December 31, 2025, which was filed with the SEC on February 20, 2026, its Current Report on Form 8-K, which was filed with the SEC on April 30, 2026, and subsequent statements of changes in beneficial ownership on file with the SEC, including the Initial Statements of Beneficial Ownership on Form 3, Statements of Change in Ownership on Form 4 or Annual Statements of Beneficial Ownership on Form 5 on file with the SEC, including filings made on March 20, 2026, May 5, 2026, May 5, 2026, May 5, 2026, May 5, 2026, May 5, 2026, May 5, 2026, May 5, 2026, May 5, 2026, May 19, 2026, June 3, 2026 and June 18, 2026. Information about Huntsman’s directors and executive officers is set forth in the Huntsman Proxy Statement on Schedule 14A for its 2026 Annual Meeting of stockholders, which was filed with the SEC on March 16, 2026, its Annual Report on Form 10-K for the year ended December 31, 2025, which was filed with the SEC on February 18, 2026, its Current Report on Form 8-K, which was filed with the SEC since May 1, 2026, and subsequent statements of changes in beneficial ownership on file with the SEC, including the Initial Statement of Beneficial Ownership on Form 3, Statements of Change in Ownership on Form 4 or Annual Statements of Beneficial Ownership on Form 5 on file with the SEC, including filings made on June 3, 2026.

Additional information concerning the interests of potential participants in the solicitation of proxies in connection with the proposed transaction, which may, in some cases, be different than those of Olin’s shareholders or Huntsman’s stockholders generally, are set forth in the registration statement, the definitive joint proxy statement/prospectus and other relevant materials filed with and to be filed with the SEC relating to the proposed transaction. You may obtain these documents free of charge through the website maintained by the SEC at http://www.sec.gov and from the Olin or Huntsman websites described above.

No Offer or Solicitation

This release does not constitute an offer to sell or the solicitation of an offer to buy or exchange any securities or a solicitation of any vote or approval in any jurisdiction. It does not constitute a prospectus or prospectus equivalent document. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the U.S. Securities Act of 1933, as amended.