Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

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. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

At April 22, 2022,26, 2023, 935.51 shares of common stock were outstanding, all of which were held by the registrant’s parent, The Dow Chemical Company.

The registrant meets the conditions set forth in General Instruction H(1)(a) and (b) for Form 10-Q and is therefore filing this form with a reduced disclosure format.

Throughout this Quarterly Report on Form 10-Q, except as otherwise indicated by the context, the terms "Corporation" or "UCC" as used herein mean Union Carbide Corporation and its subsidiaries.

Certain statements in this report are "forward-looking statements" within the meaning of the federal securities laws, including Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Such statements often address expected future business and financial performance, financial condition, and other matters, and often contain words or phrases such as “anticipate,” “believe,” “estimate,” “expect,” “intend,” “may,” “opportunity,” “outlook,” “plan,” “project,” “seek,” “should,” “strategy,” “target,” “will,” “will be,” “will continue,” “will likely result,” “would” and similar expressions, and variations or negatives of these words or phrases.

Forward-looking statements are based on current assumptions and expectations of future events that are subject to risks, uncertainties and other factors that are beyond the Corporation’s control, which may cause actual results to differ materially from those projected, anticipated or implied in the forward-looking statements and speak only as of the date the statements were made. These factors include, but are not limited to: sales of UCC's products; UCC's expenses, future revenues and profitability; the continuing global and regional economic impacts of the coronavirus disease 2019 pandemic and other public health-related risks and events on the Corporation’s business; any sanctions, export restrictions, supply chain disruptions or increased economic uncertainty related to the ongoing conflict between Russia and Ukraine; capital requirements and need for and availability of financing; unexpected barriers in the development of technology, including with respect to UCC’s contemplated capital and operating projects; significant litigation and environmental matters and related contingencies and unexpected expenses; the success of competing technologies that are or may become available; the ability to protect UCC's intellectual property in the United States and abroad; developments related to contemplated restructuring activities and proposed divestitures or acquisitions such as workforce reduction, manufacturing facility and/or asset closure and related exit and disposal activities, and the benefits and costs associated with each of the foregoing; fluctuations in energy and raw material prices; management of process safety and product stewardship; changes in consumer preferences and demand; changes in laws and regulations, political conditions or industry development; global economic and capital markets conditions, such as inflation, market uncertainty, interest and currency exchange rates, and equity and commodity prices; business or supply disruptions; security threats, such as acts of sabotage, terrorism or war, including the ongoing conflict between Russia and Ukraine; weather events and natural disasters; disruptions in the Corporation’s information technology networks and systems; and, since The Dow Chemical Company ("TDCC"), a wholly owned subsidiary of Dow Inc. (together, with TDCC and its consolidated subsidiaries, "Dow"), is the primary customer of UCC:UCC, Dow's ability to realize its commitment to carbon neutrality on the contemplated timeframe; the size of the markets for Dow’s products and services and its ability to compete in such markets; Dow's failure to develop and market new products and optimally manage product life cycles; the rate and degree of market acceptance of Dow’s products; and changes in relationships with Dow’s significant customers and suppliers.

Where, in any forward-looking statement, an expectation or belief as to future results or events is expressed, such expectation or belief is based on the current plans and expectations of management and expressed in good faith and believed to have a reasonable basis, but there can be no assurance that the expectation or belief will result or be achieved or accomplished. A detailed discussion of principal risks and uncertainties which may cause actual results and events to differ materially from such forward-looking statements is included in the section titled "Risk Factors" contained in Part II, Item 1A of this Quarterly Report on Form 10-Q and in Part I, Item 1A of the Corporation's Annual Report on Form 10-K for the year ended December 31, 2021.2022. These are not the only risks and uncertainties that the Corporation faces. There may be other risks and uncertainties that the Corporation is unable to identify at this time or that it does not currently expect to have a material impact on its business. If any of those risks or uncertainties develops into an actual event, it could have a material adverse effect on the Corporation’s business. The Corporation assumes no obligation to update or revise publicly any forward-looking statements whether because of new information, future events, or otherwise, except as required by securities and other applicable laws.

The unaudited interim consolidated financial statements of Union Carbide Corporation and its subsidiaries (the "Corporation" or "UCC") were prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") and reflect all adjustments (including normal recurring accruals) which, in the opinion of management, are considered necessary for the fair presentation of the results for the periods presented. These statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 20212022 ("20212022 10-K").

The Corporation is a wholly owned subsidiary of The Dow Chemical Company ("TDCC"). In accordance with the accounting guidance for earnings per share, the presentation of earnings per share is not required in financial statements of wholly owned subsidiaries.

TDCC conducts its worldwide operations through global businesses. The Corporation’s business activities comprise components of TDCC’s global operations rather than stand-alone operations. TDCC conducts its worldwide operations through global businesses. Because there are no separate reportable business segments for UCC under the accounting guidance related to segment reporting and no detailed business information is provided to a chief operating decision maker regarding the Corporation’s stand-alone operations, the Corporation’s results are reported as a single operating segment.

Intercompany transactions and balances are eliminated in consolidation. Transactions with the Corporation’s parent company, TDCC, and other subsidiaries of TDCC, have been reflected as related company transactions in the consolidated financial statements. See Note 1012 for additional information.

The Corporation’s contract liabilities include payments received in advance of performance under long-term contracts for product sales and royalties with remaining contract terms that range up to 1817 years. Amounts are recognized in revenue when the performance obligations for the contract are met. The Corporation has rights to additional consideration when product is delivered to the customer. The balance of contract liabilities was $32 million at

The Corporation disaggregates its revenue from contracts with customers by type of customer (sales(net sales to related companies and net sales to trade customers) as presented in the consolidated statements of income and believes this disaggregation best depicts the nature, amount, timing and uncertainty of its revenue and cash flows. Substantially all of the product sales are made to the Corporation's parent company, TDCC, and there are no unique economic factors that affect revenue recognition and cash flows associated with these product sales.

In the first quarter of 2023, the Corporation initiated restructuring actions to achieve its structural cost improvement initiatives in response to the continued economic impact from the global recessionary environment and to enhance its agility and long-term competitiveness across the economic cycle. The following table providesprogram includes workforce cost reductions and actions to rationalize the Corporation's manufacturing assets, which includes asset write-down and write-off charges. As a breakdownresult of inventories:these actions, the Corporation recorded pretax restructuring charges of $14 million, included in "Restructuring and asset related charges - net" in the consolidated statements of income. The charges consist of severance and related benefit costs of $12 million and asset write-downs and write-offs of $2 million. These actions are expected to be substantially complete by the end of 2024. The Corporation paid $1 million for severance and related benefit costs through March 31, 2023.

A summary of the Corporation's commitments and contingencies can be found in Note 1413 to the Consolidated Financial Statements included in the 20212022 10-K, which is incorporated by reference herein.

Accruals for environmental matters are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated, based on current law and existing technologies. At March 31, 2022,2023, the Corporation had accrued obligations of $177$199 million for probable environmental remediation and restoration costs ($148183 million at December 31, 2021)2022), including $23$39 million for the remediation of Superfund sites ($2336 million at December 31, 2021)2022). This is management’s best estimate of the costs for remediation and restoration with respect to environmental matters for which the Corporation has accrued liabilities, although it is reasonably possible that the ultimate cost with respect to these particular matters could range up to approximately two times that amount. Consequently, it is reasonably possible that environmental remediation and restoration costs in excess of amounts accrued could have a material impact on the Corporation's results of operations, financial condition and cash flows. It is the opinion of the Corporation’s management that the possibility is remote that costs in excess of the range disclosed will have a material impact on the Corporation’s results of operations, financial condition and cash flows. Inherent uncertainties exist in these estimates primarily due to unknown environmental conditions, changing governmental regulations and legal standards regarding liability, and emerging remediation technologies for handling site remediation and restoration. As new or additional information becomes available and/or certain spending trends become known, management will evaluate such information in determination of the current estimate of the environmental liability.

During the first quarter of 2022, the Corporation recorded a pretax charge of $37 million, included in "Cost of sales" in the consolidated statements of income, related to environmental remediation at a number of current and historical locations. The charge primarily resulted from updated remediation estimates and scope changes on existing matters.

Each quarter, the Corporation reviews asbestos-related claims filed, settled and dismissed, as well as average settlement and resolution costs by disease category. The Corporation also considers additional quantitative and qualitative factors such as the nature of pending claims, trial experience of the Corporation and other asbestos defendants, current spending for defense and processing costs, significant appellate rulings and legislative developments, trends in the tort system, and their respective effects on expected future resolution costs. UCC management considers these factors in conjunction with the most recent actuarial study and determines whether a change in the estimate is warranted. Based on the Corporation's review of 20222023 activity, it was determined that no adjustment to the accrual was required at March 31, 2022.2023.

The Corporation’s total asbestos-related liability for pending and future claims and defense and processing costs was $1,005$929 million at March 31, 20222023 ($1,016947 million at December 31, 2021)2022), and was included in “Asbestos-related liabilities - current” and “Asbestos-related liabilities - noncurrent” in the consolidated balance sheets. At March 31, 2022,2023, approximately 2625 percent of the recorded claim liability related to pending claims and approximately 7475 percent related to future claims.

The components of lease cost for operating and finance leases for the three months ended March 31, 20222023 and 20212022 were as follows:

The changes in the balances for each component of accumulated other comprehensive loss ("AOCL") for the three months ended March 31, 20222023 and 20212022 were as follows:

A summary of the Corporation's pension and other postretirement benefit plans can be found in Note 1716 to the Consolidated Financial Statements included in the 20212022 10-K. The following table provides the components of the Corporation's net periodic benefit cost (credit) for all significant plans:

Net periodic benefit cost (credit), other than the service cost component, is included in "Sundry income (expense) - net" in the consolidated statements of income.

The Corporation's financial instruments are classified as Level 2 measurements. For assets and liabilities classified as Level 2 measurements, where the security is frequently traded in less active markets, fair value is based on the closing price at the end of the period; where the security is less frequently traded, fair value is based on the price a dealer would pay for the security or similar securities, adjusted for any terms specific to that asset or liability, or by

using observable market data points of similar, more liquid securities to imply the price. Market inputs are obtained from well-established and recognized vendors of market data and subjected to tolerance and quality checks.

The following table summarizes the fair value of the Corporation's financial instruments at March 31, 20222023 and December 31, 2021:2022:

Cost approximates fair value for all other financial instruments.

The following table summarizes cash dividends declared and paid to TDCC for the three months ended March 31, 20222023 and 2021:2022:

Plaintiffs' lawyers often sue numerous defendants in individual lawsuits or on behalf of numerous claimants. As a result, the damages alleged are not expressly identified as to UCC, Amchem or any other particular defendant, even when specific damages are alleged with respect to a specific disease or injury. In fact, there are no personal injury cases in which only the Corporation and/or Amchem are the sole named defendants. For these reasons and based upon the Corporation's litigation and settlement experience, the Corporation does not consider the damages alleged against it and Amchem to be a meaningful factor in its determination of any potential asbestos-related liability.

For additional information, see Asbestos-Related Matters in Note 57 to the Consolidated Financial Statements; Part II, Item 1. Legal Proceedings; and Note 1413 to the Consolidated Financial Statements included in the 20212022 10-K.

The Corporation’s outstanding public debt has been issued under indentures which contain, among other provisions, covenants that the Corporation must comply with while the underlying notes are outstanding. Such covenants are typically based on the Corporation’s size and financial position and include, subject to the exceptions and qualifications contained in the indentures, obligations not to (i) allow liens on principal U.S. manufacturing facilities, (ii) enter into sale and lease-back transactions with respect to principal U.S. manufacturing facilities, or (iii) merge into or consolidate with any other entity or sell or convey all or substantially all of its assets. Failure of the Corporation to comply with any of these covenants could, after the passage of any applicable grace period, result in a default under the applicable indenture which would allow the note holders to accelerate the due date of the outstanding principal and accrued interest on the subject notes. Management believes the Corporation was in compliance with the covenants referred to above at March 31, 2022.2023.

On a quarterly basis, the Corporation's Board of Directors ("the Board") reviews and determines if there will be a dividend distribution to its parent company and sole shareholder, TDCC. The Board takes into consideration the level of earnings and cash flows, among other factors, in determining the amount of the dividend distribution. InFor the first quarterthree months of 2022,2023, the Corporation declared and paid a cash dividenddividends of $225$135 million to TDCC ($40225 million infor the first quarterthree months of 2021)2022). On April 18, 2022,24, 2023, the Board approved a dividend to TDCC of $296$115 million, payable on or before June 24, 2022.30, 2023.

As of the end of the period covered by this Quarterly Report on Form 10-Q, the Corporation carried out an evaluation, under the supervision and with the participation of the Corporation's Disclosure Committee and the Corporation's management, including the Chief Executive Officer and the Chief Financial Officer, of the effectiveness of the design and operation of the Corporation's disclosure controls and procedures pursuant to paragraph (b) of Exchange Act Rules 13a-15 and 15d-15. Based upon that evaluation, the Chief Executive Officer and the Chief Financial Officer concluded that the Corporation's disclosure controls and procedures were effective.

There were no changes in the Corporation's internal control over financial reporting identified in connection with the evaluation required by paragraph (d) of Exchange Act Rules 13a-15 and 15d-15 that was conducted during the last fiscal quarter ended March 31, 2023, that have materially affected, or are reasonably likely to materially affect, the Corporation's internal control over financial reporting.

No material developments in asbestos-related matters occurred in the first three months of 2022.2023. For a current status of asbestos-related matters, see Note 57 to the Consolidated Financial Statements.

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 thereunto duly authorized.