================================================================================ SEC 1745 (6-01) Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. ================================================================================ ------------------------------ OMB APPROVAL ------------------------------ OMB Number 3235-0145 Expires: October 31, 2002 Estimated average burden hours per response ..... 14.90 ------------------------------ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* INTRABIOTICS PHARMACEUTICALS, INC. ________________________________________________________________________________ (Name of Issuer) Common Stock, $.001 par value ________________________________________________________________________________ (Title of Class of Securities) 46116T 10 0 _______________________ (CUSIP Number) February 13, 2003 ________________________________________________________________________________ (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [_] Rule 13d-1(b) [x] Rule 13d-1(c) [_] Rule 13d-1(d) * 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 the disclosures provided in a prior cover page. The information required in 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 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 1 of 8 pages CUSIP No. 46116T 10 0 13G Page 2 of 8 Pages ________________________________________________________________________________ 1. Name of Reporting Persons I.R.S. Identification Nos. of above persons (entities only) Tang Capital Partners, LP ________________________________________________________________________________ 2. Check the Appropriate Box If a Member of a Group (See Instructions) (a) [_] (b) [X] Joint-Filing ________________________________________________________________________________ 3. SEC Use Only ________________________________________________________________________________ 4. Citizenship or Place of Organization United States ________________________________________________________________________________ 5. Sole Voting Power NUMBER OF 1,572,242 SHARES _________________________________________________________________ BENEFICIALLY 6. Shared Voting Power OWNED BY 0 EACH _________________________________________________________________ REPORTING 7. Sole Dispositive Power PERSON 1,572,242 WITH: _________________________________________________________________ 8. Shared Dispositive Power 0 ________________________________________________________________________________ 9. Aggregate Amount Beneficially Owned by Each Reporting Person 1,572,242 ________________________________________________________________________________ 10. Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [_] ________________________________________________________________________________ 11. Percent of Class Represented by Amount in Row (9) 4.0% ________________________________________________________________________________ 12. Type of Reporting Person (See Instructions) PN ________________________________________________________________________________ CUSIP No. 46116T 10 0 13G Page 3 of 8 Pages ________________________________________________________________________________ 1. Name of Reporting Persons I.R.S. Identification Nos. of above persons (entities only) Tang Capital Management, LLC ________________________________________________________________________________ 2. Check the Appropriate Box If a Member of a Group (See Instructions) (a) [_] (b) [X] Joint-Filing ________________________________________________________________________________ 3. SEC Use Only ________________________________________________________________________________ 4. Citizenship or Place of Organization United States ________________________________________________________________________________ 5. Sole Voting Power NUMBER OF 1,572,242 SHARES _________________________________________________________________ BENEFICIALLY 6. Shared Voting Power OWNED BY 0 EACH _________________________________________________________________ REPORTING 7. Sole Dispositive Power PERSON 1,572,242 WITH: _________________________________________________________________ 8. Shared Dispositive Power 0 ________________________________________________________________________________ 9. Aggregate Amount Beneficially Owned by Each Reporting Person 1,572,242 ________________________________________________________________________________ 10. Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [_] ________________________________________________________________________________ 11. Percent of Class Represented by Amount in Row (9) 4.0% ________________________________________________________________________________ 12. Type of Reporting Person (See Instructions) OO ________________________________________________________________________________ CUSIP No. 46116T 10 0 13G Page 4 of 8 Pages ________________________________________________________________________________ 1. Name of Reporting Persons I.R.S. Identification Nos. of above persons (entities only) Kevin C. Tang ________________________________________________________________________________ 2. Check the Appropriate Box If a Member of a Group (See Instructions) (a) [_] (b) [X] Joint-Filing ________________________________________________________________________________ 3. SEC Use Only ________________________________________________________________________________ 4. Citizenship or Place of Organization United States ________________________________________________________________________________ 5. Sole Voting Power NUMBER OF 1,572,242 SHARES _________________________________________________________________ BENEFICIALLY 6. Shared Voting Power OWNED BY 0 EACH _________________________________________________________________ REPORTING 7. Sole Dispositive Power PERSON 1,572,242 WITH: _________________________________________________________________ 8. Shared Dispositive Power 0 ________________________________________________________________________________ 9. Aggregate Amount Beneficially Owned by Each Reporting Person 1,572,242 ________________________________________________________________________________ 10. Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [_] ________________________________________________________________________________ 11. Percent of Class Represented by Amount in Row (9) 4.0% ________________________________________________________________________________ 12. Type of Reporting Person (See Instructions) IN ________________________________________________________________________________ CUSIP No. 46116T 10 0 13G Page 5 of 8 Pages ________________________________________________________________________________ 1. Name of Reporting Persons I.R.S. Identification Nos. of above persons (entities only) Oscar L. Tang ________________________________________________________________________________ 2. Check the Appropriate Box If a Member of a Group (See Instructions) (a) [_] (b) [X] Joint-Filing ________________________________________________________________________________ 3. SEC Use Only ________________________________________________________________________________ 4. Citizenship or Place of Organization United States ________________________________________________________________________________ 5. Sole Voting Power NUMBER OF 281,000 SHARES _________________________________________________________________ BENEFICIALLY 6. Shared Voting Power OWNED BY 114,500 EACH _________________________________________________________________ REPORTING 7. Sole Dispositive Power PERSON 281,000 WITH: _________________________________________________________________ 8. Shared Dispositive Power 114,500 ________________________________________________________________________________ 9. Aggregate Amount Beneficially Owned by Each Reporting Person 395,500 ________________________________________________________________________________ 10. Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [_] ________________________________________________________________________________ 11. Percent of Class Represented by Amount in Row (9) 1.0% ________________________________________________________________________________ 12. Type of Reporting Person (See Instructions) IN ________________________________________________________________________________ ________________________________________________________________________________ Item 1(a). Name of Issuer: Intrabiotics Pharmaceuticals, Inc. ________________________________________________________________________________ Item 1(b). Address of Issuer's Principal Executive Offices: 1245 Terra Bella Avenue, Mountain View, CA 94043 ________________________________________________________________________________ Item 2(a). Name of Person Filing: Tang Capital Partners, LP Tang Capital Management, LLC Kevin C. Tang Oscar L. Tang ________________________________________________________________________________ Item 2(b). Address of Principal Business Office, or if None, Residence: Tang Capital Partners, LP Tang Capital Management, LLC Kevin C. Tang 4401 Eastgate Mall San Diego, CA 92121 Oscar L. Tang c/o Reich & Tang Asset Management LLC 600 Fifth Avenue, 8th Floor New York, NY 10020 ________________________________________________________________________________ Item 2(c). Citizenship: United States ________________________________________________________________________________ Item 2(d). Title of Class of Securities: Common Stock, par value $.001 ________________________________________________________________________________ Item 2(e). CUSIP Number: 46116T 10 0 ________________________________________________________________________________ ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO SS.240.13d-1(b) OR 240.13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A: (a) [_] Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o). (b) [_] Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c). (c) [_] Insurance company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c). (d) [_] Investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8). (e) [_] An investment adviser in accordance with ss.240.13d-1(b)(1)(ii)(E); (f) [_] An employee benefit plan or endowment fund in accordance with ss.240.13d-1(b)(1)(ii)(F); (g) [_] A parent holding company or control person in accordance with ss.240.13d-1(b)(1)(ii)(G); (h) [_] A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813); (i) [_] A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3); (j) [_] Group, in accordance with ss.240.13d-1(b)(1)(ii)(J). Not applicable. ITEM 4. OWNERSHIP. (a) Amount beneficially owned as of February 13, 2003: The aggregate number and percentage of securities to which this Schedule 13G relates is 1,967,742 shares, representing 5.0% of the 39,184,886 shares outstanding as reported by the Issuer in its registration statement on Form S-3 (Reg. No. 333-101633). The Filing Persons beneficially own those securities set forth below: Tang Capital Partners, LP 1,572,242 shares Tang Capital Management, LLC 1,572,242 shares Kevin C. Tang 1,572,242 shares Oscar L. Tang 395,500 shares (b) Percent of class: Tang Capital Partners, LP 4.0% Tang Capital Management, LLC 4.0% Kevin C. Tang 4.0% Oscar L. Tang 1.0% (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: Tang Capital Partners, LP 1,572,242 shares Tang Capital Management, LLC 1,572,242 shares Kevin C. Tang 1,572,242 shares Oscar L. Tang 281,000 shares (ii) Shared power to vote or to direct the vote: Tang Capital Partners, LP 0 shares Tang Capital Management, LLC 0 shares Kevin C. Tang 0 shares Oscar L. Tang 114,500 shares (iii) Sole power to dispose or to direct the disposition of: Tang Capital Partners, LP 1,572,242 shares Tang Capital Management, LLC 1,572,242 shares Kevin C. Tang 1,572,242 shares Oscar L. Tang 281,000 shares (iv) Shared power to dispose or to direct the disposition of: Tang Capital Partners, LP 0 shares Tang Capital Management, LLC 0 shares Kevin C. Tang 0 shares Oscar L. Tang 114,500 shares ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS. If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [ ]. ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON: NOT APPLICABLE ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY: NOT APPLICABLE ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP: See Item 12 of Cover Pages and Item 2 of this Schedule 13G. Tang Capital Partners, LP is the registered holder of the shares. Tang Capital Management, LLC is the general partner of Tang Capital Partners, LP. Kevin C. Tang is the Manager of Tang Capital Management, LLC. Kevin C. Tang is the son of Oscar L. Tang. ITEM 9. NOTICE OF DISSOLUTION OF GROUP Not applicable. ITEM 10. CERTIFICATION By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect. 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. March 3, 2003 ---------------------------------------- (Date) TANG CAPITAL PARTNERS, LP By: Tang Capital Management, LLC By: /s/ Kevin C. Tang ------------------------ Kevin C. Tang, Manager TANG CAPITAL MANAGEMENT, LLC By: /s/ Kevin C. Tang ------------------------ Kevin C. Tang, Manager /s/ Kevin C. Tang ------------------------ KEVIN C. TANG /s/ Oscar L. Tang ------------------------ OSCAR L. TANG EXHIBIT I TO SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED Pursuant to Rule 13d-1(k)(1), TANG CAPITAL PARTNERS, LP affirms that it is individually eligible to use Schedule 13G and agrees that this Schedule is filed on its behalf. TANG CAPITAL PARTNERS, LP By: Tang Capital Management, LLC By: /s/ Kevin C. Tang ------------------------ Kevin C. Tang, Manager EXHIBIT II TO SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED Pursuant to Rule 13d-1(k)(1), TANG CAPITAL MANAGEMENT, LLC affirms that it is individually eligible to use Schedule 13G and agrees that this Schedule is filed on its behalf. TANG CAPITAL MANAGEMENT, LLC By: /s/ Kevin C. Tang ------------------------ Kevin C. Tang, Manager EXHIBIT III TO SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED Pursuant to Rule 13d-1(k)(1), KEVIN C. TANG affirms that he is individually eligible to use Schedule 13G and agrees that this Schedule is filed on his behalf. /s/ Kevin C. Tang ------------------------ Kevin C. Tang EXHIBIT IV TO SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED Pursuant to Rule 13d-1(k)(1), OSCAR L. TANG affirms that he is individually eligible to use Schedule 13G and agrees that this Schedule is filed on his behalf. /s/ Oscar L. Tang ------------------------ Oscar L. Tang