Union Carbide Corp

For the transition period from __________to___________

Commission File Number: 1-1463 Union Carbide Corporation (Exact name of registrant as specified in its charter) New York 13-1421730 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)

7501 STATE HIGHWAY 185 NORTH , SEADRIFT , TX 77983 (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code: 361 - 553-2769

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. ☑ Yes ☐ No

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). ☑ Yes ☐ No

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). ☐ Yes ☑ No

At October 23, 2026, 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 therefore is filing this form with the reduced disclosure format. 1

QUARTERLY REPORT ON FORM 10-Q For the quarterly period ended September 30, 2026

Consolidated Statements of Comprehensive Income . 5

Consolidated Statements of Cash Flows . 7

Notes to the Consolidated Financial Statements . 9

Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations . 16

Item 3. Quantitative and Qualitative Disclosures About Market Risk . 19