1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 14) TRANSATLANTIC HOLDINGS, INC. - ------------------------------------------------------------------------------- (Name of Issuer) COMMON STOCK, PAR VALUE $1.00 PER SHARE - ------------------------------------------------------------------------------- (Title of Class of Securities) 893521 10 4 ----------------------------------------- (CUSIP Number) KATHLEEN E. SHANNON VICE PRESIDENT AND SECRETARY AMERICAN INTERNATIONAL GROUP, INC. 70 PINE STREET, NEW YORK, NEW YORK 10270 (212) 770-5123 - ------------------------------------------------------------------------------- (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) DECEMBER 10, 1999 ------------------------------------------------------- (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(b)(3) or (4), check the following box / /. 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.

2 SCHEDULE 13D CUSIP No. 893521 10 4 PAGE 2 of 6 PAGES 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AMERICAN INTERNATIONAL GROUP, INC. IRS NO. 13-2592361 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) / / (B) / / 3 SEC USE ONLY 4 SOURCE OF FUNDS WC 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or (e) / / 6 CITIZENSHIP OR PLACE OF ORGANIZATION INCORPORATED IN THE STATE OF DELAWARE 7 SOLE VOTING POWER NUMBER OF 8,868,168 SHARES BENEFICIALLY 8 SHARED VOTING POWER OWNED BY 20,611,620 EACH REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH 8,868,168 10 SHARED DISPOSITIVE POWER 20,611,620 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 20,611,620 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 59.4 14 TYPE OF REPORTING PERSON HC, CO

3 SCHEDULE 13D CUSIP No. 893521 10 4 PAGE 3 of 6 PAGES 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AMERICAN HOME ASSURANCE COMPANY IRS ID# 13-5124990 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) / / (B) / / 3 SEC USE ONLY 4 SOURCE OF FUNDS WC 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or (e) / / 6 CITIZENSHIP OR PLACE OF ORGANIZATION INCORPORATED IN THE STATE OF NEW YORK 7 SOLE VOTING POWER NUMBER OF SHARES BENEFICIALLY 8 SHARED VOTING POWER OWNED BY 11,743,452 EACH REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH 10 SHARED DISPOSITIVE POWER 11,743,452 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 11,743,452 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 33.8 14 TYPE OF REPORTING PERSON IC, CO

4 ITEM 1. Security and Issuer. This Statement relates to the common stock, par value $1.00 per share ("Common Stock"), of Transatlantic Holdings, Inc., a Delaware corporation ("Company"). This Statement amends and supplements Items 1, 3 and 5 of the Statement on Schedule 13D dated August 13, 1991, Amendment No. 1 to such Schedule 13D dated November 3, 1993, Amendment No. 2 to such Schedule 13D dated March 4, 1994, Amendment No. 3 to such Schedule 13D dated March 31, 1994, Amendment No. 4 to such Schedule 13D dated November 21, 1995, Amendment No. 5 to such Schedule 13D dated July 9, 1998, Amendment No. 6 to such Schedule 13D dated August 7, 1998, Amendment No. 7 to such Schedule 13D dated September 11, 1998, Amendment No. 8 to such Schedule 13D dated January 19, 1999, Amendment No. 9 to such Schedule 13D dated March 4, 1999, Amendment No. 10 to such Schedule 13D dated March 11, 1999, Amendment No. 11 to such Schedule 13D dated April 19, 1999, Amendment No. 12 to such Schedule 13D dated July 26, 1999 and Amendment No. 13 to such Schedule 13D dated September 10, 1999 (hereinafter collectively referred to as the "Schedule 13D"), previously filed by American International Group, Inc., a Delaware corporation ("AIG"), on behalf of itself and its wholly owned subsidiary, American Home Assurance Company, a New York corporation ("AHAC"). The principal executive offices of the Company are located at 80 Pine Street, New York, New York 10005. Capitalized terms used herein and not otherwise defined shall have the meaning ascribed to such terms as in the Schedule 13D. ITEM 3. Source and Amount of Funds or Other Consideration. During the period from September 13, 1999 through December 10, 1999, AIG purchased 354,700 additional shares of Common Stock at prices ranging from $69.1250 to $75.7500 per share. AIG used its available working capital to purchase the shares of Common Stock. ITEM 5. Interest in Securities of Issuer. (a) and (b). The information required by these paragraphs is set forth in Items 7 through 11 and 13 of each of the cover pages to this Amendment No. 14 to Schedule 13D and is based upon the number of shares of Common Stock outstanding on September 30, 1999 (34,715,549), as reported in the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 1999. (c). Since the filing of Amendment No. 13 to Schedule 13D dated September 10, 1999, AIG has acquired 354,700 shares of Common Stock as follows: Date Number of Shares Purchased Price Per Share ---- -------------------------- --------------- 09/13/99 2,400 72.6875 " 2,600 72.7500 09/15/99 1,000 71.4375 " 200 71.5000 " 8,800 71.9375 " 3,100 71.8750 09/16/99 3,400 71.8750 " 1,200 71.8125 " 2,800 71.7500 09/17/99 3,000 72.0000 " 200 71.9375 09/20/99 2,000 72.3125 " 6,800 72.3750 09/21/99 8,000 72.3750 " 2,000 72.3125 " 1,300 72.2500 09/22/99 12,300 72.3750 " 400 72.3125 09/23/99 1,800 72.3750 " 1,600 72.3125 09/24/99 5,000 71.4375 " 2,300 72.3125 " 1,700 72.2500 " 11,000 72.1875 09/27/99 3,300 71.6250 09/28/99 5,500 71.5625 " 100 71.5000 " 200 71.4375 " 1,400 71.3750 " 300 71.3125 " 4,000 71.2500 " 1,400 71.1875 " 900 71.1250 " 2,100 71.0625 " 2,000 70.9375 09/29/99 5,000 70.7500 " 4,000 70.5625 " 1,000 70.3750 09/30/99 8,400 70.5625 " 200 70.6250 Page 4 of 6 Pages

5 Date Number of Shares Purchased Price Per Share ---- -------------------------- --------------- 10/01/99 5,000 70.2500 " 2,100 70.1250 " 1,000 70.0000 " 900 69.8750 " 1,000 69.7500 " 6,600 69.3750 " 400 69.3125 " 1,000 69.2500 " 1,000 69.1875 " 1,000 69.1250 10/04/99 400 69.3750 10/05/99 1,000 70.5000 " 800 70.5625 " 2,500 70.6250 " 10,700 70.7500 10/08/99 4,000 71.0000 10/11/99 2,600 71.0625 " 6,000 71.1250 10/12/99 10,000 71.0000 " 10,000 71.0625 10/13/99 15,000 71.0000 10/14/99 3,600 70.5625 " 1,400 70.6250 " 2,000 69.6875 " 300 69.8750 10/15/99 9,000 69.9375 " 700 69.8750 10/18/99 500 71.0625 " 500 71.1250 10/19/99 1,200 70.1250 10/20/99 2,600 71.0625 10/21/99 300 71.1250 " 900 71.1875 10/22/99 5,000 71.2500 " 1,400 71.3750 11/03/99 2,500 74.9375 11/10/99 3,000 74.8750 " 300 74.9375 11/11/99 3,300 74.9375 " 2,900 74.8750 11/12/99 20,000 74.8750 " 20,000 74.8125 11/19/99 6,000 74.9375 " 4,900 74.8750 " 4,100 74.8125 11/22/99 8,700 74.8750 " 1,300 74.8125 " 7,100 74.6875 " 2,900 74.6250 11/23/99 1,000 74.7500 " 2,000 74.6875 " 6,100 74.5625 " 7,600 74.5625 12/10/99 5,000 74.9375 " 5,000 74.8750 " 10,000 75.7500 The above purchases were made in Open Market Purchases. AIG, AHAC, SICO and Starr and, to the best of AIG's and AHAC's knowledge, the Covered Persons, have not engaged in any transactions in Common Stock within the past 60 days other than those transactions described above. Page 5 of 6 Pages

6 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: December 10, 1999 AMERICAN INTERNATIONAL GROUP, INC. By: /s/ KATHLEEN E. SHANNON ------------------------------- Kathleen E. Shannon Vice President and Secretary AMERICAN HOME ASSURANCE COMPANY By: /s/ EDWARD E. MATTHEWS ------------------------------- Edward E. Matthews Senior Vice President Page 6 of 6 Pages