UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 4)* CARPENTER TECHNOLOGY CORPORATION ----------------------------------------------------------------- (Name of Issuer) Common Stock, par value $5.00 per share ----------------------------------------------------------------- (Title of Class of Securities) 144285 10 3 ----------------------------------- (CUSIP Number) John A. Martin c/o PNC Advisors - Hawthorn 249 Fifth Avenue, 2nd Floor Pittsburgh, PA 15222 (412) 762-2766 ----------------------------------------------------------------- (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) February 21, 2006 ------------------------------------------------------- (Date of Event which Requires Filing of this Statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box [ ]. Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See ss.240.13d-7 for other parties to whom copies are to be sent. *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. CUSIP NO. 144285 10 3 Page 2 of 6 Pages The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). Page 3 of 6 Pages SCHEDULE 13D/A (Amendment No. 4) CUSIP No. 144285 10 3 1. NAME OF REPORTING PERSON Ada E. Rossin I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (Entities Only) 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [ X ] 3. SEC USE ONLY 4. SOURCE OF FUNDS 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) [ ] 6. CITIZENSHIP OR PLACE OF ORGANIZATION United States Citizen NUMBER OF 7. SOLE VOTING POWER 174,770 SHARES --------------------------------------------------------- BENEFICIALLY 8. SHARED VOTING POWER 850,100 OWNED BY --------------------------------------------------------- EACH 9. SOLE DISPOSITIVE POWER 174,770 REPORTING --------------------------------------------------------- PERSON WITH 10. SHARED DISPOSITIVE POWER 850,100 --------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,024,870 --------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.05% --------- 14. TYPE OF REPORTING PERSON IN CUSIP NO. 144285 10 3 Page 4 of 6 Pages This Schedule 13D/A, Amendment No. 4 (the "Amendment") relates to the common stock, par value $5.00 per share ("Common Stock") of Carpenter Technology Corporation ("CTC"). Except as specifically set forth in this Amendment, the Schedule 13D, as amended on November 5, 2004, May 26, 2005 and November 7, 2005 (the "Schedule 13D"), remains unmodified. Item 5. Interest in Securities of the Issuer. Items 5(a), (b) and (e) of the Schedule 13D are hereby amended and restated to read as set forth below. Items 5(c)-(d) remain unchanged. (a) Ada E. Rossin may be deemed to indirectly beneficially own (i) 40,000 shares of CTC Common Stock as co-trustee of two trusts (the "Trusts) for the benefit of her two grandchildren, (ii) 810,100 shares of CTC Common Stock as co-trustee and lifetime beneficiary of the Ada E. Rossin Revocable Trust and (iii) 174,770 shares of CTC Common Stock as trustee and beneficiary of the Ada E. Rossin QTIP Trust. Accordingly, Ada E. Rossin may be deemed to be the beneficial owner of a total of 1,024,870 shares of CTC Common Stock or approximately 4.05% of the outstanding shares of CTC Common Stock. (b) Ada E. Rossin has sole voting and dispositive power over the 174,770 shares of CTC Common Stock in the Ada E. Rossin QTIP Trust. In addition, Ada E. Rossin has shared voting and dispositive power over 40,000 shares of CTC Common Stock in the Trusts and the 810,100 shares in the Ada E. Rossin Revocable Trust. (e) On February 21, 2006, the reporting person, Ada E. Rossin, ceased to be the beneficial owner of more than five percent of the outstanding shares of CTC Common Stock. Item 7. Material to be Filed as Exhibits. Exhibit No. Description ----------- ----------- 24.1 Power of Attorney (incorporated by reference from Exhibit 24.1 to the amended Schedule 13D filed by Ada E. Rossin on November 5, 2004). CUSIP NO. 144285 10 3 Page 5 of 6 Pages Signature After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete, and correct. Dated: February 22, 2006 /s/ John A. Martin ------------------------------------ John A. Martin, Attorney-in-Fact for Ada E. Rossin CUSIP NO. 144285 10 3 Page 6 of 6 Pages Exhibit Index ------------- Exhibit No. Description ----------- ----------- 24.1 Power of Attorney (incorporated by reference from Exhibit 24.1 to the amended Schedule 13D filed by Ada E.Rossin on November 5, 2004).