SCHEDULE 13D/A 0001140361-24-042264 0001032211 XXXXXXXX LIVE 4 Common Stock, par value $0.01 per share 07/31/2025 false 0001013880 89854H102 TTEC Holdings, Inc.

5251 DTC Parkway Suite 995 Greenwood Village CO 80111

Kenneth D. Tuchman (303) 397-8100 5251 DTC Parkway, Suite 995 Greenwood Village CO 80111 Andrew J. Nussbaum (212) 403-1000 Wachtell, Lipton, Rosen & Katz 51 W. 52nd Street New York NY 10019 0001032211 TUCHMAN KENNETH D a OO X1 6526401 21326806 6526401 21326806 27853207 N 58.2 IN (1) Consists of (i) 14,766,806 shares beneficially owned by Mr. Tuchman in his capacity as the controlling person of Mantucket Capital Management Corporation, the sole general partner of KDT Family, LLLP, (ii) 6,550,000 shares beneficially owned by Mr. Tuchman in his capacity as the sole trustee of KDT Stock Revocable Trust, and (iii) 10,000 shares beneficially owned by Mr. Tuchman's spouse. Mr. Tuchman disclaims beneficial ownership of all shares beneficially owned by his spouse. (2) Based on 47,833,188 shares of Common Stock outstanding as of May 1, 2025, according to information provided by TTEC Holdings, Inc., a Delaware corporation (the "Company"). Y KDT Stock Revocable Trust a OO CO 0 6550000 0 6550000 6550000 N 13.7 OO (1) Power is shared with its sole trustee, Kenneth D. Tuchman. (2) Based on 47,833,188 shares of Common Stock outstanding as of May 1, 2025, according to information provided by the Company. Y KDT Family, LLLP a OO CO 0 14766806 0 14766806 14766806 N 30.9 PN (1) Power is shared with its sole general partner, Mantucket Capital Management Corporation, and Kenneth D. Tuchman, the controlling person of Mantucket Capital Management Corporation. (2) Based on 47,833,188 shares of Common Stock outstanding as of May 1, 2025, according to information provided by the Company. Y Mantucket Capital Management Corporation a OO CO 0 14766806 0 14766806 14766806 N 30.9 CO (1) Consists of 14,766,806 shares beneficially owned by Mantucket Capital Management Corporation in its capacity as the sole general partner of KDT Family, LLLP. (2) Based on 47,833,188 shares of Common Stock outstanding as of May 1, 2025, according to information provided by the Company. Common Stock, par value $0.01 per share TTEC Holdings, Inc. 5251 DTC Parkway Suite 995 Greenwood Village CO 80111 Item 4 of the 13D is hereby supplemented to include the following information at the end of Item 4: On July 31, 2025, Mr. Tuchman delivered a letter to the Board of Directors of the Company withdrawing his previously disclosed non-binding proposal to acquire all of the outstanding shares of Common Stock not already owned by the Reporting Persons for cash consideration at a purchase price of $6.85 per share of Common Stock. A copy of the letter is filed as Exhibit 99.1 to this Amendment. The Reporting Persons will continue to review their investment in the Company on a continuing basis and may in the future take or propose to take such actions with respect to their investment in the Company as they deem appropriate. The information set forth on rows 11 and 13 of each of the cover pages of this 13D is incorporated herein by reference. To the knowledge of each of the Reporting Persons, none of the Covered Persons (as defined and identified in the initial 13D) owns beneficially pursuant to Rule 13d-3 of the Act any shares of Common Stock. The information set forth in rows 7 through 10 of each of the cover pages of this 13D is incorporated herein by reference. None of the Reporting Persons have effected any transactions in the Common Stock in the last sixty (60) days. Not applicable. Not applicable. Item 6 of the 13D is hereby supplemented to incorporate by reference the information set forth in Item 4 above. Item 7 of the 13D is hereby supplemented by adding the following exhibit: Exhibit Number Description 99.1 Letter, dated July 31, 2025 from Kenneth D. Tuchman to the Board of Directors of TTEC Holdings, Inc. TUCHMAN KENNETH D /s/ Kenneth D. Tuchman 08/01/2025 KDT Stock Revocable Trust /s/ Kenneth D. Tuchman 08/01/2025 KDT Family, LLLP /s/ Kenneth D. Tuchman 08/01/2025 Mantucket Capital Management Corporation /s/ Kenneth D. Tuchman 08/01/2025