SC 13D/A 1 d72535_sc13da.txt AMENDMENT TO GEN. STATE. OF BEN. OWNERSHIP UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 6) RADISYS CORPORATION (RSYS) (Name of Issuer) Common Stock (Title of Class of Securities) 750459109 (CUSIP Number) David Nierenberg The D3 Family Funds 19605 NE 8th Street Camas, WA 98607 (360) 604-8600 With a copy to: Henry Lesser, Esq. DLA Piper US LLP 2000 University Avenue East Palo Alto, CA 94303 (650) 833-2000 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) August 10, 2007 (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 that is the subject of this Schedule 13D and is filing this schedule because of ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box |_|. -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only) The D3 Family Fund, L.P. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (a) |X| (b) |_| -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (See Instructions) WC -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) |_| -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Washington -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 563,835 Common shares (2.6%) NUMBER OF --------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 0 EACH --------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH 563,835 --------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON For the reporting person listed on this page, 563,835; for all reporting persons as a group, 3,308,908 shares (15.0%) -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions) |_| -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.0% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (See Instructions) PN -------------------------------------------------------------------------------- 2 -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only) The DIII Offshore Fund, L.P. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (a) |X| (b) |_| -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (See Instructions) WC -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) |_| -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Bahamas -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 669,657 common shares (3.0%) NUMBER OF --------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 0 EACH --------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH 669,657 --------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON For the reporting person listed on this page, 669,657 shares; for all reporting persons as a group, 3,308,908 shares (15.0%) -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions) |_| -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.0% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (See Instructions) PN -------------------------------------------------------------------------------- 3 -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only) The D3 Family Bulldog Fund, L.P. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (a) |X| (b) |_| -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (See Instructions) WC -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) |_| -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Washington -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 2,022,521 common shares (9.2%) NUMBER OF --------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 0 EACH --------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH 2,022,521 --------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON For the reporting person listed on this page, 2,022,521 shares; for all reporting persons as a group, 3,308,908 shares (15.0%) -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions) |_| -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.0% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (See Instructions) PN -------------------------------------------------------------------------------- 4 -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only) The D3 Family Canadian Fund, L.P. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (c) |X| (d) |_| -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (See Instructions) WC -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) |_| -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Washington -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 52,895 common shares (0.2%) NUMBER OF --------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 0 EACH --------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH 52,895 --------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON For the reporting person listed on this page, 52,895 shares; for all reporting persons as a group, 3,308,908 shares (15.0%) -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions) |_| -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.0% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (See Instructions) PN -------------------------------------------------------------------------------- 5 -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only) Nierenberg Investment Management Company, Inc. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (a) |X| (b) |_| -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (See Instructions) WC -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) |_| -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Washington -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 0 NUMBER OF --------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 3,308,908 shares (15.0%) EACH --------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH 0 --------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 3,308,908 shares -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON For the reporting person listed on this page, 3,308,908; for all reporting persons as a group, 3,308,908 shares (15.0 %) -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions) |_| -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.0% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (See Instructions) CO -------------------------------------------------------------------------------- 6 -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only) Nierenberg Investment Management Offshore, Inc. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (a) |X| (b) |_| -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (See Instructions) WC -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) |_| -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Bahamas -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 0 NUMBER OF --------------------------------------------------------------- SHARES 8 SHARED VOTING POWER BENEFICIALLY OWNED BY 669,657 common shares (3.0%) EACH --------------------------------------------------------------- REPORTING 9 SOLE DISPOSITIVE POWER PERSON WITH 0 --------------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 669,657 common shares -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON For the reporting person listed on this page, 669,657 shares; for all reporting persons as a group, 3,308,908 shares (15.0%) -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions) |_| -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.0% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (See Instructions) CO -------------------------------------------------------------------------------- 7 This Amendment No. 6 to Schedule 13D (this "Amendment") amends the below-indicated items from the Schedule 13D previously filed by or on behalf of the undersigned parties (the "Reporting Persons"), as previously amended (the "Schedule 13D"), by supplementing such Items with the information below: Item 5. Interest in Securities of the Issuer. (a, b) The Reporting Persons, in the aggregate, beneficially own 3,308,908 common shares, constituting approximately 15.0% of the outstanding shares. (c) Since the prior amendment to the Schedule 13D the following purchases of Shares were made by D(3) Family Funds in open market transactions: Fund Transaction Date Shares Bought Price ---- ---------------- ------------- ----- D3 Family Fund 8/3/2007 18,000 11.54 D3 Family Bulldog Fund 8/3/2007 63,240 11.54 D3 Family Canadian Fund 8/3/2007 1,600 11.54 D3 Family Fund 8/6/2007 15,945 11.03 D3 Family Bulldog Fund 8/6/2007 62,400 11.03 D3 Family Canadian Fund 8/6/2007 2,450 11.03 D3 Family Fund 8/7/2007 6,000 10.94 D3 Family Bulldog Fund 8/7/2007 23,300 10.94 D3 Family Canadian Fund 8/7/2007 700 10.94 D3 Family Fund 8/10/2007 25,100 11.53 D3 Family Bulldog Fund 8/10/2007 91,800 11.53 D3 Family Canadian Fund 8/10/2007 3,100 11.53 D3 Family Fund 8/13/2007 11,050 10.86 D3 Family Bulldog Fund 8/13/2007 39,650 10.86 D3 Family Canadian Fund 8/13/2007 1,047 10.86 8 SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, each of the undersigned certifies that the information set forth in the Statement is true, complete and correct. D3 Family Fund, L.P., D3 Family Bulldog Fund, L.P., and D3 Family Canadian Fund, L.P. By: Nierenberg Investment Management Company, Inc. Its: General Partner August 14, 2007 By: /s/ David Nierenberg ------------------------- ----------------------------------------- David Nierenberg, President DIII Offshore Fund, L.P. By: Nierenberg Investment Management Offshore, Inc. Its: General Partner August 14, 2007 By: /s/ David Nierenberg ------------------------- ----------------------------------------- David Nierenberg, President Nierenberg Investment Management Company, Inc. August 14, 2007 By: /s/ David Nierenberg ------------------------- ----------------------------------------- David Nierenberg, President Nierenberg Investment Management Offshore, Inc. August 14, 2007 By: /s/ David Nierenberg ------------------------- ----------------------------------------- David Nierenberg, President 9