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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Form 13F

Form 13F COVER PAGE

Report for the Calendar Year or Quarter Ended: September 30, 2007

Check here if Amendment [ ]; Amendment Number: This Amendment (Check only one.): [ ] is a restatement.
[ ] adds new holdings entries.

Institutional Investment Manager Filing this Report: 

Name: Piper Jaffray Companies
Address: 800 Nicollet Mall
 Suite 800
 Minneapolis, MN 55402-7020

Form 13F File Number: 28-10776

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager: 

Name: Greg Meyer
Title: Controller
Phone: 612-303-6000

Signature, Place, and Date of Signing: 

Greg Meyer Minneapolis, MN 11/13/07
------------------------------ ------------------------------- -------------
[Signature] [City, State] [Date]

Report Type (Check only one.):

[X] 13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.)

[ ] 13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).)

[ ] 13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)

FORM 13F
SUMMARY PAGE

Report Summary: 

Number of Other Included Managers: 0

 112
Form 13F Information Table Entry Total: _________

 90,975
Form 13F Information Table Value Total: $_________
 (thousands)

List of Other Included Managers:

Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report. NONE 

 COLUMN 5
 ------------------ COLUMN 6 COLUMN 7 COLUMN 8
 COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 SHRS OR SH/ PUT/ INVESTMENT OTHER ---------------------
 NAME OF ISSUER TITLE OF CLASS CUSIP VALUE (X$1000) PRN AMT PRN CALL DISCRETION MANAGERS SOLE SHARED NONE
 -------------- --------------- --------- -------------- --------- --- ---- ---------- -------- --------- ------ ----
ACTIVISION INC NEW COM NEW 004930202 108 5,000 SH SOLE 5,000 0 0
ACXIOM CORP COM 005125109 28 1,400 SH SOLE 1,400 0 0
ALEXION PHARMACEUTICALS INC NOTE 1.375% 2/0 015351AF6 5,502 2,580,000 PRN SOLE 2,580,000 0 0
ALLERGAN INC COM 018490102 193 3,000 SH SOLE 3,000 0 0
ALLIANCE IMAGING INC COM NEW 018606202 138 15,200 SH SOLE 15,200 0 0
ANDERSONS INC COM 034164103 32 673 SH SOLE 673 0 0
ANNTAYLOR STORES CORP COM 036115103 16 500 SH SOLE 500 0 0
ARCADIA RES INC COM 039209101 4 4,500 SH SOLE 4,500 0 0
AUDIOCODES LTD ORD M15342104 1,368 250,100 SH SOLE 250,100 0 0
BARE ESCENTUALS INC COM 067511105 2 100 SH SOLE 100 0 0
BON-TON STORES INC COM 09776J101 10 430 SH SOLE 430 0 0
BORLAND SOFTWARE CORP COM 099849101 3 620 SH SOLE 620 0 0
BRIGHTPOINT INC COM NEW 109473405 41 2,758 SH SOLE 2,758 0 0
BRISTOL MYERS SQUIBB CO COM 110122108 58 2,000 SH SOLE 2,000 0 0
CAI INTERNATIONAL INC COM 12477X106 1,505 106,722 SH SOLE 106,722 0 0
CANADIAN SOLAR INC COM 136635109 2 181 SH SOLE 181 0 0
CASUAL MALE RETAIL GRP INC COM 148711104 1 100 SH SOLE 100 0 0
CBL & ASSOC PPTYS INC COM 124830100 14 407 SH SOLE 407 0 0
CHEESECAKE FACTORY INC COM 163072101 42 1,779 SH SOLE 1,779 0 0
CHEMED CORP NEW NOTE 1.875% 5/1 16359RAC7 1,963 2,000,000 PRN SOLE 2,000,000 0 0
CHINA SUNERGY CO LTD SPON ADR 16942X104 1 100 SH SOLE 100 0 0
CHIPOTLE MEXICAN GRILL INC CL B 169656204 1,284 12,000 SH SOLE 12,000 0 0
CIENA CORP COM NEW 171779309 857 22,500 SH SOLE 22,500 0 0
CISCO SYS INC COM 17275R102 1,657 50,000 SH CALL SOLE 50,000 0 0
CITRIX SYS INC COM 177376100 1,210 30,000 SH PUT SOLE 30,000 0 0
CLAYTON HLDGS INC COM 18418N107 34 4,289 SH SOLE 4,289 0 0
CONMED CORP NOTE 2.500%11/1 207410AD3 956 1,000,000 PRN SOLE 1,000,000 0 0
CORE LABORATORIES LP NOTE 0.250%10/3 21868FAB9 2,982 2,100,000 PRN SOLE 2,100,000 0 0
COREL CORP NEW COM 21869X103 13 1,000 SH SOLE 1,000 0 0
CROCS INC COM 227046109 168 2,500 SH SOLE 2,500 0 0
DEXCOM INC COM 252131107 15 1,519 SH SOLE 1,519 0 0
ENERGY CONVERSION DEVICES IN COM 292659109 189 8,297 SH SOLE 8,297 0 0
EVERGREEN SOLAR INC COM 30033R108 1 100 SH SOLE 100 0 0
FCSTONE GROUP INC COM 31308T100 16 500 SH SOLE 500 0 0
FEI CO NOTE 6/1 30241LAD1 51 42,000 PRN SOLE 42,000 0 0
FEI CO NOTE 2.875% 6/0 30241LAF6 489 386,000 PRN SOLE 386,000 0 0
FINANCIAL FED CORP DBCV 2.000% 4/1 317492AF3 2,163 2,000,000 PRN SOLE 2,000,000 0 0
FIRST SOLAR INC COM 336433107 589 5,000 SH SOLE 5,000 0 0
FOCUS MEDIA HLDG LTD SPONSORED ADR 34415V109 435 7,500 SH SOLE 7,500 0 0
GANDER MOUNTAIN CO COM 36471P108 2 300 SH SOLE 300 0 0
GENZYME CORP COM 372917104 1,239 20,000 SH CALL SOLE 20,000 0 0
HARTE-HANKS INC COM 416196103 26 1,300 SH SOLE 1,300 0 0
HEALTH CARE REIT INC NOTE 4.750%12/0 42217KAP1 4,813 4,650,000 PRN SOLE 4,650,000 0 0
INFORMATICA CORP NOTE 3.000% 3/1 45666QAB8 3,773 3,650,000 PRN SOLE 3,650,000 0 0
INTEL CORP COM 458140100 5 200 SH SOLE 200 0 0
INTERACTIVE DATA CORP COM 45840J107 8 300 SH SOLE 300 0 0
INTERMEC INC COM 458786100 68 2,600 SH SOLE 2,600 0 0
ISILON SYS INC COM 46432L104 26 3,400 SH SOLE 3,400 0 0
JAMBA INC COM 47023A101 15 2,100 SH SOLE 2,100 0 0
KENDLE INTERNATIONAL INC NOTE 3.375% 7/1 48880LAA5 2,203 2,000,000 PRN SOLE 2,000,000 0 0
LAWSON SOFTWARE INC NEW NOTE 2.500% 4/1 52078PAA0 2,950 2,770,000 PRN SOLE 2,770,000 0 0
LIFE TIME FITNESS INC COM 53217R207 178 2,902 SH SOLE 2,902 0 0
LIMELIGHT NETWORKS INC COM 53261M104 59 6,650 SH SOLE 6,650 0 0
LINEAR TECHNOLOGY CORP NOTE 3.125% 5/0 535678AD8 3,474 3,500,000 PRN SOLE 3,500,000 0 0
LKQ CORP COM 501889208 3 82 SH SOLE 82 0 0
MACROVISION CORP NOTE 2.625% 8/1 555904AB7 2,719 2,500,000 PRN SOLE 2,500,000 0 0
MAGMA DESIGN AUTOMATION NOTE 2.000% 5/1 559181AC6 1,228 1,150,000 PRN SOLE 1,150,000 0 0
MARLIN BUSINESS SVCS CORP COM 571157106 1,188 82,936 SH SOLE 82,936 0 0
MATHSTAR INC COM 576801203 9 8,254 SH SOLE 8,254 0 0
MAXTOR CORP NOTE 2.375% 8/1 577729AE6 3,922 2,500,000 PRN SOLE 2,500,000 0 0
MCCLATCHY CO CL A 579489105 26 1,300 SH SOLE 1,300 0 0
MEDAREX INC COM 583916101 1 100 SH SOLE 100 0 0
METABOLIX INC COM 591018809 182 7,500 SH SOLE 7,500 0 0
MICRON TECHNOLOGY INC COM 595112103 569 51,300 SH SOLE 51,300 0 0
MORTONS RESTAURANT GRP INC N COM 619430101 80 5,000 SH SOLE 5,000 0 0
MWI VETERINARY SUPPLY INC COM 55402X105 6 170 SH SOLE 170 0 0
NEUROMETRIX INC COM 641255104 218 25,000 SH SOLE 25,000 0 0
NMS COMMUNICATIONS CORP COM 629248105 74 60,000 SH SOLE 60,000 0 0
OCWEN FINL CORP NOTE 3.250% 8/0 675746AD3 950 1,000,000 PRN SOLE 1,000,000 0 0
ON SEMICONDUCTOR CORP NOTE 4/1 682189AE5 7,975 5,848,000 PRN SOLE 5,848,000 0 0
ORBITZ WORLDWIDE INC COM 68557K109 113 10,000 SH SOLE 10,000 0 0
OSCIENT PHARMACEUTICALS CORP NOTE 3.500% 4/1 68812RAC9 14 23,000 PRN SOLE 23,000 0 0
OSI PHARMACEUTICALS INC NOTE 2.000%12/1 671040AF0 4,221 3,250,000 PRN SOLE 3,250,000 0 0
P F CHANGS CHINA BISTRO INC COM 69333Y108 15 500 SH SOLE 500 0 0
PANTRY INC COM 698657103 26 1,000 SH SOLE 1,000 0 0
PEABODY ENERGY CORP COM 704549104 349 7,300 SH SOLE 7,300 0 0
PEOPLESUPPORT INC COM 712714302 1 64 SH SOLE 64 0 0
PMC-SIERRA INC COM 69344F106 19 2,209 SH SOLE 2,209 0 0
PMC-SIERRA INC NOTE 2.250%10/1 69344FAD8 5,518 4,696,000 PRN SOLE 4,696,000 0 0
POOL CORPORATION COM 73278L105 27 1,100 SH SOLE 1,100 0 0
POWERSHARES QQQ TRUST UNIT SER 1 73935A104 5,141 100,000 SH PUT SOLE 100,000 0 0
PROSHARES TR ULTRASHT SP500 74347R883 481 9,500 SH SOLE 9,500 0 0
PROTEIN DESIGN LABS INC NOTE 2.000% 2/1 74369LAF0 2,979 2,800,000 PRN SOLE 2,800,000 0 0
PSS WORLD MED INC NOTE 2.250% 3/1 69366AAB6 236 200,000 PRN SOLE 200,000 0 0
RAIT FINANCIAL TRUST COM 749227104 66 8,000 SH SOLE 8,000 0 0
RED ROBIN GOURMET BURGERS IN COM 75689M101 60 1,400 SH SOLE 1,400 0 0
RF MICRODEVICES INC COM 749941100 45 6,700 SH SOLE 6,700 0 0
ROYAL BK SCOTLAND GROUP PLC SP ADR PREF S 780097739 1 50 SH SOLE 50 0 0
ROYAL BK SCOTLAND GROUP PLC ADR PREF SER N 780097770 48 2,150 SH SOLE 2,150 0 0
SCIELE PHARMA INC NOTE 2.625% 5/1 808627AA1 2,681 2,500,000 PRN SOLE 2,500,000 0 0
SHORETEL INC COM 825211105 1 100 SH SOLE 100 0 0
SKYWORKS SOLUTIONS INC COM 83088M102 97 10,700 SH SOLE 10,700 0 0
SKYWORKS SOLUTIONS INC NOTE 1.500% 3/0 83088MAH5 342 300,000 PRN SOLE 300,000 0 0
SONOSITE INC COM 83568G104 3 100 SH SOLE 100 0 0
SONOSITE INC NOTE 3.750% 7/1 83568GAA2 252 250,000 PRN SOLE 250,000 0 0
SPREADTRUM COMMUNICATIONS IN ADR 849415203 80 5,620 SH SOLE 5,620 0 0
STRATS TR AMBAC FIN GP 2007- CL A CTF CALLA 784786204 134 6,070 SH SOLE 6,070 0 0
SUNPOWER CORP COM CL A 867652109 373 4,500 SH SOLE 4,500 0 0
SYMANTEC CORP NOTE 0.750% 6/1 871503AD0 570 500,000 PRN SOLE 500,000 0 0
TCF FINL CORP COM 872275102 92 3,500 SH SOLE 3,500 0 0
TECHWELL INC COM 87874D101 142 13,386 SH SOLE 13,386 0 0
TEKTRONIX INC COM 879131100 25 900 SH SOLE 900 0 0
THE9 LTD ADR 88337K104 62 1,800 SH SOLE 1,800 0 0
TRIZETTO GROUP INC NOTE 2.750%10/0 896882AB3 3,876 3,500,000 PRN SOLE 3,500,000 0 0
TUESDAY MORNING CORP COM NEW 899035505 4 400 SH SOLE 400 0 0
U.S. AUTO PARTS NETWORK INC COM 90343C100 56 6,380 SH SOLE 6,380 0 0
UNIVERSAL FST PRODS INC COM 913543104 24 800 SH SOLE 800 0 0


US BIOENERGY CORP COM 90342V109 1 96 SH SOLE 96 0 0
VISUAL SCIENCES INC COM 92845H108 446 30,899 SH SOLE 30,899 0 0
VOLCOM INC COM 92864N101 4 100 SH SOLE 100 0 0
WET SEAL INC CL A 961840105 29 7,500 SH SOLE 7,500 0 0
WILSON GREATBATCH TECHNOLOGI SDCV 2.250% 6/1 972232AB8 192 200,000 PRN SOLE 200,000 0 0

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