Results of Operations

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549     Form 8-K     CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report: April 24, 2025     CARPENTER TECHNOLOGY CORPORATION (Exact name of registrant as specified in its charter)       Delaware   1-5828   23-0458500 (State of or other jurisdiction of incorporation)   (Commission File Number)   (IRS Employer I.D. No.) 1735 Market Street Philadelphia , Pennsylvania     19103 (Address of principal executive offices)     (Zip Code) (610) 208-2000 Registrant’s telephone number, including area code     Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:   ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)   ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)   ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))   ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered or required to be registered pursuant to Section 12(b) of the Act:   Title of each class   Trading Symbol   Name of each exchange on which registered Common Stock, $5 Par Value   CRS   New York Stock Exchange Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b.2 of this chapter). Emerging growth company  ☐ 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. ☐       Item 2.02 - Results of Operations and Financial Condition. On April 24, 2025, Carpenter Technology Corporation held its third quarter fiscal year 2025 earnings call, broadcast live by webcast. A copy of the slides presented during the call are furnished as Exhibit 99.1 to this Form 8-K and shall not be deemed to be “filed” for any purpose. Item 9.01 - Financial Statements and Exhibits (d) Exhibits   Exhibit No.    Descriptions 99.1    Slides presented during Carpenter Technology Corporation third quarter fiscal year 2025 earnings call 104    Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101) 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 hereunto duly authorized.   CARPENTER TECHNOLOGY CORPORATION By   /s/ Timothy Lain   Timothy Lain   Senior Vice President and Chief Financial Officer Date: April 29, 2025