SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 -------------------------------- AMENDMENT NO. 1 TO FORM 8-K/A CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 JUNE 2, 1999 (Date of Report - earliest event reported) TRIANGLE PHARMACEUTICALS, INC. (Exact name of registrant as specified in charter) DELAWARE 000-21589 56-1930728 (State of incorporation or organization) (Commission (IRS Employer File Number) Identification No.) 4 University Place, 4611 University Drive, Durham, North Carolina 27707 Registrant's telephone number, including area code: (919)493-5980 NONE ----------------------------------------------------------------------- (Former name or former address, if changed since last report.) Item 7. EXHIBITS. * 2.1 Collaboration Agreement, dated as of June 2, 1999 by and between Triangle Pharmaceuticals, Inc. and Abbott Laboratories. * 2.2 Co-Promotion Agreement, dated as of June 2, 1999 by and between Triangle Pharmaceuticals, Inc. and Abbott Laboratories. + 2.3 Triangle Pharmaceuticals, Inc. Common Stock Purchase Agreement, dated as of June 2, 1999 by and between Triangle Pharmaceuticals, Inc. and Abbott Laboratories. + 2.4 Triangle Pharmaceuticals, Inc. Stockholder Rights Agreement, dated as of June 2, 1999 by and between Triangle Pharmaceuticals, Inc. and Abbott Laboratories. # 4.1 Amendment to Rights Agreement, dated as of June 2, 1999 by and between Triangle Pharmaceuticals, Inc. and Abbott Laboratories. + 99.1 Press Release dated June 3, 1999. * Certain confidential portions of this Exhibit were omitted by means of marking such portions with an asterisk (the "Mark"). This Exhibit has been filed with the Secretary of the Commission without the Mark pursuant to the Company's application requesting confidential treatment under Rule 24b-2 under the Securities Exchange Act of 1934, as amended. # Previously filed. + Filed as an exhibit to Abbott Laboratories' Schedule 13D filed with the Securities and Exchange Commission on June 11, 1999 and incorporated herein by reference. SIGNATURE 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 thereunto duly authorized. TRIANGLE PHARMACEUTICALS, INC. Date: November 2, 1999 By: /s/ Thomas R. Staab, II ------------------------------------- Thomas R. Staab, II Acting Chief Financial Officer and Treasurer TRIANGLE PHARMACEUTICALS, INC. FORM 8-K EXHIBIT INDEX EXHIBIT DOCUMENT DESCRIPTION NUMBER -------------------- ------- * 2.1 Collaboration Agreement, dated as of June 2, 1999 by and between Triangle Pharmaceuticals, Inc. and Abbott Laboratories. * 2.2 Co-Promotion Agreement, dated as of June 2, 1999 by and between Triangle Pharmaceuticals, Inc. and Abbott Laboratories. + 2.3 Triangle Pharmaceuticals, Inc. Common Stock Purchase Agreement, dated as of June 2, 1999 by and between Triangle Pharmaceuticals, Inc. and Abbott Laboratories. + 2.4 Triangle Pharmaceuticals, Inc. Stockholder Rights Agreement, dated as of June 2, 1999 by and between Triangle Pharmaceuticals, Inc. and Abbott Laboratories. # 4.1 Amendment to Rights Agreement, dated as of June 2, 1999 by and between Triangle Pharmaceuticals, Inc. and Abbott Laboratories. + 99.1 Press Release dated June 3, 1999. * Certain confidential portions of this Exhibit were omitted by means of marking such portions with an asterisk (the "Mark"). This Exhibit has been filed with the Secretary of the Commission without the Mark pursuant to the Company's application requesting confidential treatment under Rule 24b-2 under the Securities Exchange Act of 1934, as amended. # Previously filed. + Filed as an exhibit to Abbott Laboratories' Schedule 13D filed with the Securities and Exchange Commission on June 11, 1999 and incorporated herein by reference.