SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 1)* Sonus Pharmaceuticals, Inc. - -------------------------------------------------------------------------------- (Name of Issuer) Common Stock - -------------------------------------------------------------------------------- (Title of Class of Securities) 0008356921 - -------------------------------------------------------------------------------- (CUSIP Number) *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. 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). (Continued on following pages) Page 1 of 9 Pages
- -------------------------------------------------------- --------------------------------------- CUSIP NO. 0008356921 13 G Page 2 of 9 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Delphi Ventures III, L.P. ("DV III") Tax ID Number: - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ----------------------------------- -------- ----------------------------------------------------------------------- 5 SOLE VOTING POWER NUMBER OF 0 shares SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH -------- ----------------------------------------------------------------------- 6 SHARED VOTING POWER 0 shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 shares. - ----------------------------------- -------- ----------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.00% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------------------------------------------------- --------------------------------------- CUSIP NO. 0008356921 13 G Page 3 of 9 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Delphi BioInvestments III, L.P. ("DBI III") Tax ID Number: - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ----------- -------------------------------------------------------------------------------------------------------- 5 SOLE VOTING POWER NUMBER OF 0 shares. SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH -------- ----------------------------------------------------------------------- 6 SHARED VOTING POWER 0 shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 shares. - ----------------------------------- -------- ----------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.00% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------------------------------------------------- --------------------------------------- CUSIP NO. 0008356921 13 G Page 4 of 9 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Delphi Management Partners III, LLC ("DMP III") Tax ID Number: - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ----------------------------------- -------- ----------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 shares. BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH -------- ----------------------------------------------------------------------- 6 SHARED VOTING POWER 0 shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 shares. - ----------------------------------- -------- ----------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.00% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------------------------------------------------- --------------------------------------- CUSIP NO. 0008356921 13 G Page 5 of 9 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON James R. Bochnowski ("Bochnowski") Tax ID Number: - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION U.S. Citizen - ----------------------------------- -------- ----------------------------------------------------------------------- 5 SOLE VOTING POWER NUMBER OF 16,103 shares. SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH -------- ----------------------------------------------------------------------- 6 SHARED VOTING POWER 0 shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 16,103 shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 shares. - ----------------------------------- -------- ----------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 16,103 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.19% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------------------------------------------------- --------------------------------------- CUSIP NO. 0008356921 13 G Page 6 of 9 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON David Douglass ("Douglass") Tax ID Number: - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION U.S. Citizen - ----------------------------------- -------- ----------------------------------------------------------------------- 5 SOLE VOTING POWER NUMBER OF 0 shares. SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH -------- ----------------------------------------------------------------------- 6 SHARED VOTING POWER 0 shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 shares. - ----------- -------------------------------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.00% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!
- -------------------------------------------------------- --------------------------------------- CUSIP NO. 0008356921 13 G Page 7 of 9 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Donald J. Lothrop ("Lothrop") Tax ID Number: - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION U.S. Citizen - ----------------------------------- -------- ----------------------------------------------------------------------- NUMBER OF SHARES 5 SOLE VOTING POWER BENEFICIALLY 0 shares. OWNED BY EACH REPORTING PERSON WITH -------- ----------------------------------------------------------------------- 6 SHARED VOTING POWER 0 shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 shares. - ----------- -------------------------------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.00% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!
Page 8 of 9 Pages This Statement amends the Statement on Schedule 13(G) (the "Original Statement") filed by Delphi Ventures III, L.P., a Delaware limited partnership ("DV III"), Delphi BioInvestments III, L.P. ("DBI III"), Delphi Management Partners III, LLC, a Delaware limited liability company ("DMP III"), James R. Bochnowski ("Bochnowski"), David Douglass ("Douglass"), and Donald J. Lothrop ("Lothrop"). The foregoing entities and individuals are collectively referred to as the "Reporting Persons." Only those items as to which there has been a change are included in this Amendment. ITEM 4. OWNERSHIP The following information with respect to the ownership of the Common Stock of the issuer by the persons filing this Statement is provided as of December 31, 1997: (a) Amount beneficially owned: See Row 9 of cover page for each Reporting Person. (b) Percent of Class: See Row 11 of cover page for each Reporting Person. (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: See Row 5 of cover page for each Reporting Person. (ii) Shared power to vote or to direct the vote: See Row 6 of cover page for each Reporting Person. (iii) Sole power to dispose or to direct the disposition of: See Row 7 of cover page for each Reporting Person. (iv) Shared power to dispose or to direct the disposition of: See Row 8 of cover page for each Reporting Person. Page 9 of 9 Pages 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: [X] SIGNATURES 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 6, 1998 /s/ James R. Bochnowski --------------------------------------------- James R. Bochnowski, individually, and on behalf of DV II, in his capacity as a general partner of DMP II, the general partner of DV II, on behalf of DBI II, in his capacity as a general partner of DMP II, the general partner of DBI II, and on behalf of DMP II in his capacity as a general partner thereof. /s/ David Douglass --------------------------------------------- David Douglass /s/ Donald J. Lothrop --------------------------------------------- Donald J. Lothrop