OMB APPROVAL
                                                      --------------------------
                                                      OMB Number:     3235-0006
                                                      Expires: October 31, 2003
                                                      Estimated average burden
                                                      hours per response....23.3

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

                                    Form 13F

                               Form 13F COVER PAGE

Report for the Calendar Year or Quarter Ended: March 31, 2008

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            4/29/08
-------------------------------------   ----------------------   ---------------
[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

Form 13F Information Table Entry Total:          207

Form 13F Information Table Value Total:   $   88,477
                                           (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 1               COLUMN 2     COLUMN 3 COLUMN 4     COLUMN 5        COLUMN 6  COLUMN 7       COLUMN 8
---------------------------- --------------- --------- -------- ------------------ ---------- -------- ---------------------
                                                        Value    SHRS OR  SH/ PUT/ INVESTMENT  OTHER
NAME OF ISSUER               TITLE OF CLASS    CUSIP   (X$1000)   PRN AMT PRN CALL DISCRETION MANAGERS    SOLE   SHARED NONE
--------------               --------------- --------- -------- --------- --- ---- ---------- -------- --------- ------ ----
                                                                                       
ACTEL CORP                   COM             004934105       26     1,700 SH                               1,700      0    0
ACTUANT CORP                 CL A NEW        00508X203       30     1,000 SH                               1,000      0    0
AFFILIATED MANAGERS GROUP    COM             008252108       27       300 SH                                 300      0    0
AGCO CORP                    COM             001084102       30       500 SH                                 500      0    0
AIR METHODS CORP             COM PAR $.06    009128307       24       500 SH                                 500      0    0
AIRGAS INC                   COM             009363102       32       700 SH                                 700      0    0
AKAMAI TECHNOLOGIES INC      COM             00971T101       11       400 SH                                 400      0    0
AKORN INC                    COM             009728106       22     4,600 SH                               4,600      0    0
ALEXANDRIA REAL ESTATE EQ IN COM             015271109       19       200 SH                                 200      0    0
ALLETE INC                   COM NEW         018522300       23       600 SH                                 600      0    0
ALLIANCE IMAGING INC         COM NEW         018606202       44     5,100 SH                               5,100      0    0
AMDOCS LTD                   ORD             G02602103       28       990 SH                                 990      0    0
AMERICAN MED SYS HLDGS INC   NOTE 3.250% 7/0 02744MAA6    4,973 5,100,000 PRN                          5,100,000      0    0
AMERICAN TOWER CORP          CL A            029912201       20       500 SH                                 500      0    0
AMICAS INC                   COM             001712108       14     6,180 SH                               6,180      0    0
AMYLIN PHARMACEUTICALS INC   NOTE 3.000% 6/1 032346AF5    5,428 6,500,000 PRN                          6,500,000      0    0
ANNALY CAP MGMT INC          COM             035710409       23     1,500 SH                               1,500      0    0
APPLE INC                    COM             037833100       29       200 SH                                 200      0    0
ASSURANT INC                 COM             04621X108       24       400 SH                                 400      0    0
ATS MED INC                  NOTE 6.000%10/1 002083AB9    2,621 3,000,000 PRN                          3,000,000      0    0
AXIS CAPITAL HOLDINGS        SHS             G0692U109       20       600 SH                                 600      0    0
BELDEN INC                   COM             077454106       18       500 SH                                 500      0    0
BIGBAND NETWORKS INC         COM             089750509      110    19,134 SH                              19,134      0    0
BIOMARIN PHARMACEUTICAL INC  COM             09061G101       60     1,700 SH                               1,700      0    0
BIOMED REALTY TRUST INC      COM             09063H107       33     1,400 SH                               1,400      0    0
BJ SVCS CO                   COM             055482103        9       299 SH                                 299      0    0
BLACKROCK INC                COM             09247X101       20       100 SH                                 100      0    0
BLOCKBUSTER INC              CL A            093679108      426   130,540 SH                             130,540      0    0
BOEING CO                    COM             097023105      112     1,500 SH                               1,500      0    0
BORLAND SOFTWARE CORP        COM             099849101       13     6,520 SH                               6,520      0    0
CADENCE DESIGN SYSTEM INC    NOTE 1.375%12/1 127387AD0    1,760 2,000,000 PRN                          2,000,000      0    0
CALIFORNIA PIZZA KITCHEN INC COM             13054D109       33     2,500 SH                               2,500      0    0
CAMERON INTERNATIONAL CORP   NOTE 2.500% 6/1 13342BAB1    4,204 3,000,000 PRN                          3,000,000      0    0
CARPENTER TECHNOLOGY CORP    COM             144285103       22       400 SH                                 400      0    0
CAVCO INDS INC DEL           COM             149568107       21       600 SH                                 600      0    0
CELLCOM ISRAEL LTD           SHS             M2196U109       22       700 SH                                 700      0    0
CENTERPLATE INC              UNIT 99/99/9999 15200E204       25     2,500 SH                               2,500      0    0
CENTRAL EUROPEAN DIST CORP   NOTE 3.000% 3/1 153435AA0    2,123 2,000,000 PRN                          2,000,000      0    0
CHARLOTTE RUSSE HLDG INC     COM             161048103      434    25,000 SH                              25,000      0    0
CHINA SEC & SURVE TECH INC   COM             16942J105       27     1,500 SH                               1,500      0    0
CHURCH & DWIGHT INC          COM             171340102       22       400 SH                                 400      0    0
CIENA CORP                   NOTE 0.875% 6/1 171779AE1    1,913 2,000,000 PRN                          2,000,000      0    0
CISCO SYS INC                COM             17275R102       24     1,000 SH                               1,000      0    0
CME GROUP INC                COM             12572Q105       12        25 SH                                  25      0    0
COGNIZANT TECHNOLOGY SOLUTIO CL A            192446102       17       600 SH                                 600      0    0
COMMSCOPE INC                COM             203372107       28       800 SH                                 800      0    0
COMPASS MINERALS INTL INC    COM             20451N101       53       900 SH                                 900      0    0
CONMED CORP                  NOTE 2.500%11/1 207410AD3      930 1,000,000 PRN                          1,000,000      0    0
CORE LABORATORIES LP         NOTE 0.250%10/3 21868FAB9    6,148 4,500,000 PRN                          4,500,000      0    0
CORE LABORATORIES N V        COM             N22717107       21       175 SH                                 175      0    0
CORRECTIONS CORP AMER NEW    COM NEW         22025Y407       19       700 SH                                 700      0    0
CREE INC                     COM             225447101      210     7,522 SH                               7,522      0    0
DARDEN RESTAURANTS INC       COM             237194105       26       800 SH                                 800      0    0
DAVITA INC                   COM             23918K108       14       300 SH                                 300      0    0
DEXCOM INC                   COM             252131107      104    25,000 SH                              25,000      0    0
DIGITAL RIV INC              COM             25388B104       63     2,025 SH                               2,025      0    0
DIODES INC                   NOTE 2.250%10/0 254543AA9      453   500,000 PRN                            500,000      0    0
DOLAN MEDIA CO               COM             25659P402       28     1,400 SH                               1,400      0    0
DUPONT FABROS TECHNOLOGY INC COM             26613Q106       23     1,400 SH                               1,400      0    0
EATON VANCE CORP             COM NON VTG     278265103        9       300 SH                                 300      0    0
ENTERGY CORP NEW             COM             29364G103       22       200 SH                                 200      0    0
EQUINIX INC                  NOTE 3.000%10/1 29444UAG1    1,833 2,000,000 PRN                          2,000,000      0    0
EQUITABLE RES INC            COM             294549100       47       800 SH                                 800      0    0
EURONET WORLDWIDE INC        DBCV 1.625%12/1 298736AD1    2,081 2,290,000 PRN                          2,290,000      0    0
EV3 INC                      COM             26928A200      122    15,000 SH                              15,000      0    0
EXPEDITORS INTL WASH INC     COM             302130109       18       400 SH                                 400      0    0
EXPRESS SCRIPTS INC          COM             302182100       13       200 SH                                 200      0    0
F M C CORP                   COM NEW         302491303       53       950 SH                                 950      0    0
FACTSET RESH SYS INC         COM             303075105       11       200 SH                                 200      0    0
FEI CO                       NOTE 2.875% 6/0 30241LAF6    1,381 1,386,000 PRN                          1,386,000      0    0
FMC TECHNOLOGIES INC         COM             30249U101       40       700 SH                                 700      0    0
GAMESTOP CORP NEW            CL A            36467W109       52     1,000 SH                               1,000      0    0
GENERAL CABLE CORP DEL NEW   COM             369300108       35       600 SH                                 600      0    0
GIANT INTERACTIVE GROUP INC  ADR             374511103       63     5,000 SH                               5,000      0    0
GILDAN ACTIVEWEAR INC        COM             375916103       19       500 SH                                 500      0    0
GREENHILL & CO INC           COM             395259104       21       300 SH                                 300      0    0
HALLMARK FINL SVCS INC    EC COM NEW         40624Q203        2       200 SH                                 200      0    0
HANSEN NAT CORP              COM             411310105       11       300 SH                                 300      0    0
HCP INC                      COM             40414L109       24       700 SH                                 700      0    0
HOLOGIC INC                  COM             436440101       39       700 SH                                 700      0    0
HOLOGIC INC                  FRNT 2.000%12/1 436440AA9    3,004 3,125,000 PRN                          3,125,000      0    0
HOME DEPOT INC               COM             437076102       87     3,100 SH                               3,100      0    0
HOME DIAGNOSTICS INC DEL     COM             437080104       33     4,804 SH                               4,804      0    0
ICONIX BRAND GROUP INC       NOTE 1.875% 6/3 451055AB3    1,359 1,500,000 PRN                          1,500,000      0    0
IDENIX PHARMACEUTICALS INC   COM             45166R204        4       700 SH                                 700      0    0
IHS INC                      CL A            451734107       26       400 SH                                 400      0    0
ILLUMINA INC                 NOTE 0.625% 2/1 452327AB5    9,133 5,060,000 PRN                          5,060,000      0    0
IMAX CORP                    COM             45245E109        8     1,100 SH                               1,100      0    0
IMCLONE SYS INC              COM             45245W109        1        16 SH                                  16      0    0
IMMUCOR INC                  COM             452526106       11       500 SH                                 500      0    0
INCYTE CORP                  COM             45337C102       30     2,900 SH                               2,900      0    0
INFORMATICA CORP             COM             45666Q102      853    50,000 SH  PUT                         50,000      0    0
INTERFACE INC                CL A            458665106        8       600 SH                                 600      0    0
IPC THE HOSPITALIST CO INC   COM             44984A105    1,014    51,269 SH                              51,269      0    0
ITC HLDGS CORP               COM             465685105       31       600 SH                                 600      0    0
ITRON INC                    COM             465741106       27       300 SH                                 300      0    0
JAMES RIVER COAL CO          COM NEW         470355207       25     1,400 SH                               1,400      0    0
JONES LANG LASALLE INC       COM             48020Q107       15       200 SH                                 200      0    0
JOY GLOBAL INC               COM             481165108       65     1,000 SH                               1,000      0    0
JUNIPER NETWORKS INC         NOTE 6/1        48203RAC8    7,568 6,000,000 PRN                          6,000,000      0    0
KINDER MORGAN ENERGY PARTNER UT LTD PARTNER  494550106       22       400 SH                                 400      0    0
KINDER MORGAN MANAGEMENT LLC SHS             49455U100       20       400 SH                                 400      0    0
KINROSS GOLD CORP            COM NO PAR      496902404       24     1,100 SH                               1,100      0    0
L-3 COMMUNICATIONS HLDGS INC COM             502424104       33       300 SH                                 300      0    0
LABORATORY CORP AMER HLDGS   COM NEW         50540R409       15       200 SH                                 200      0    0
LAMAR ADVERTISING CO         CL A            512815101        7       200 SH                                 200      0    0
LAWSON SOFTWARE INC NEW      NOTE 2.500% 4/1 52078PAA0    2,764 3,000,000 PRN                          3,000,000      0    0
LDK SOLAR CO LTD             SPONSORED ADR   50183L107       16       600 SH                                 600      0    0
LEAPFROG ENTERPRISES INC     CL A            52186N106       18     2,500 SH                               2,500      0    0
LHC GROUP INC                COM             50187A107       12       700 SH                                 700      0    0
LIMITED BRANDS INC           COM             532716107       86     5,000 SH                               5,000      0    0
LINEAR TECHNOLOGY CORP       COM             535678106      239     7,800 SH                               7,800      0    0
LINEAR TECHNOLOGY CORP       NOTE 3.125% 5/0 535678AD8    3,283 3,424,000 PRN                          3,424,000      0    0
LKQ CORP                     COM             501889208       38     1,700 SH                               1,700      0    0
LOGITECH INTL S A            SHS             H50430232       18       700 SH                                 700      0    0
MAGMA DESIGN AUTOMATION      NOTE 2.000% 5/1 559181AC6    1,689 1,869,000 PRN                          1,869,000      0    0
MASTERCARD INC               CL A            57636Q104       22       100 SH                                 100      0    0
MCCORMICK & SCHMICKS SEAFD R COM             579793100       29     2,500 SH                               2,500      0    0
MECHEL OAO                   SPONSORED ADR   583840103       23       200 SH                                 200      0    0
METABOLIX INC                COM             591018809       58     5,300 SH                               5,300      0    0
MICREL INC                   COM             594793101       25     2,700 SH                               2,700      0    0
MICROCHIP TECHNOLOGY INC     COM             595017104       13       400 SH                                 400      0    0
MICROS SYS INC               COM             594901100        7       200 SH                                 200      0    0
MICROSOFT CORP               COM             594918104       99     3,500 SH                               3,500      0    0
MIDCAP SPDR TR               UNIT SER 1      595635103        7        50 SH                                  50      0    0
MORNINGSTAR INC              COM             617700109        6       100 SH                                 100      0    0
MORTONS RESTAURANT GRP INC N COM             619430101       20     2,500 SH                               2,500      0    0
MOSAIC CO                    COM             61945A107       21       200 SH                                 200      0    0
NATIONAL CINEMEDIA INC       COM             635309107       18       800 SH                                 800      0    0
NEW ORIENTAL ED & TECH GRP I SPON ADR        647581107       19       300 SH                                 300      0    0
NEWMONT MINING CORP          COM             651639106      136     3,000 SH                               3,000      0    0
NII HLDGS INC                CL B NEW        62913F201       11       350 SH                                 350      0    0
NIKE INC                     CL B            654106103       20       300 SH                                 300      0    0





                                                                                       
NMS COMMUNICATIONS CORP      COM             629248105       90    60,000 SH                              60,000      0    0
NORTHEAST UTILS              COM             664397106       34     1,400 SH                               1,400      0    0
NORTHWESTERN CORP            COM NEW         668074305       10       400 SH                                 400      0    0
NYSE EURONEXT                COM             629491101    3,421    55,440 SH                              55,440      0    0
ODYSSEY HEALTHCARE INC       COM             67611V101        2       250 SH                                 250      0    0
OIL STS INTL INC             COM             678026105        9       200 SH                                 200      0    0
ON SEMICONDUCTOR CORP        COM             682189105      568   100,000 SH  PUT                        100,000      0    0
ON SEMICONDUCTOR CORP        NOTE 4/1        682189AE5    4,550 5,000,000 PRN                          5,000,000      0    0
ONLINE RES CORP              COM             68273G101       75     7,760 SH                               7,760      0    0
ORASURE TECHNOLOGIES INC     COM             68554V108       58     7,943 SH                               7,943      0    0
ORIENTAL FINL GROUP INC      COM             68618W100       24     1,200 SH                               1,200      0    0
OSHKOSH CORP                 COM             688239201       44     1,200 SH                               1,200      0    0
OSI PHARMACEUTICALS INC      NOTE 2.000%12/1 671040AF0      355   250,000 PRN                            250,000      0    0
PARKERVISION INC             COM             701354102        5       600 SH                                 600      0    0
PARTNER COMMUNICATIONS CO LT ADR             70211M109       25     1,100 SH                               1,100      0    0
PC MALL INC                  COM             69323K100        5       500 SH                                 500      0    0
PEGASYSTEMS INC              COM             705573103      288    29,857 SH                              29,857      0    0
PENGROWTH ENERGY TR          TR UNIT NEW     706902509       25     1,300 SH                               1,300      0    0
PEPSIAMERICAS INC            COM             71343P200       77     3,000 SH                               3,000      0    0
PERMIAN BASIN RTY TR         UNIT BEN INT    714236106       24     1,100 SH                               1,100      0    0
PERRIGO CO                   COM             714290103       53     1,400 SH                               1,400      0    0
PETROLEUM DEV CORP           COM             716578109       21       300 SH                                 300      0    0
PHASE FORWARD INC            COM             71721R406       22     1,300 SH                               1,300      0    0
PHOENIX TECHNOLOGY LTD       COM             719153108       22     1,400 SH                               1,400      0    0
POLO RALPH LAUREN CORP       CL A            731572103       17       300 SH                                 300      0    0
POLYMET MINING CORP          COM             731916102       32    10,000 SH                              10,000      0    0
PRAXAIR INC                  COM             74005P104       17       200 SH                                 200      0    0
PROASSURANCE CORP            COM             74267C106       27       500 SH                                 500      0    0
PROGENICS PHARMACEUTICALS IN COM             743187106        1       168 SH                                 168      0    0
PROSHARES TR                 ULTRASHRT O&G   74347R586      154     4,000 SH                               4,000      0    0
PROSHARES TR                 ULTRA XIN CH25  74347R321      187     2,000 SH                               2,000      0    0
PROSHARES TR                 BASIC MTRL PRO  74347R651      237     6,000 SH                               6,000      0    0
PSYCHIATRIC SOLUTIONS INC    COM             74439H108       14       400 SH                                 400      0    0
RESMED INC                   COM             761152107       21       494 SH                                 494      0    0
RICKS CABARET INTL INC       COM NEW         765641303       27     1,200 SH                               1,200      0    0
RUBIOS RESTAURANTS INC       COM             78116B102        1       200 SH                                 200      0    0
SANDISK CORP                 NOTE 1.000% 5/1 80004CAC5    1,381 1,879,000 PRN                          1,879,000      0    0
SAVIENT PHARMACEUTICALS INC  COM             80517Q100       30     1,500 SH                               1,500      0    0
SCHEIN HENRY INC             NOTE 3.000% 8/1 806407AB8    2,971 2,195,000 PRN                          2,195,000      0    0
SEACOR HOLDINGS INC          COM             811904101       26       300 SH                                 300      0    0
SEARS HLDGS CORP             COM             812350106       20       200 SH                                 200      0    0
SKILLSOFT PLC                SPONSORED ADR   830928107       25     2,400 SH                               2,400      0    0
SONIC INNOVATIONS INC        COM             83545M109       30     6,311 SH                               6,311      0    0
SONOSITE INC                 NOTE 3.750% 7/1 83568GAA2    1,014 1,000,000 PRN                          1,000,000      0    0
SOTHEBYS                     COM             835898107       17       600 SH                                 600      0    0
SOUTHWESTERN ENERGY CO       COM             845467109       27       800 SH                                 800      0    0
SPDR TR                      UNIT SER 1      78462F103       79       600 SH                                 600      0    0
SPECTRANETICS CORP           COM             84760C107       34     4,021 SH                               4,021      0    0
STARENT NETWORKS CORP        COM             85528P108      153    11,338 SH                              11,338      0    0
STERICYCLE INC               COM             858912108       10       200 SH                                 200      0    0
SYNGENTA AG                  SPONSORED ADR   87160A100       64     1,100 SH                               1,100      0    0
TCF FINL CORP                COM             872275102       90     5,000 SH                               5,000      0    0
TD AMERITRADE HLDG CORP      COM             87236Y108       28     1,700 SH                               1,700      0    0
TECHNE CORP                  COM             878377100       64       950 SH                                 950      0    0
TEMPUR PEDIC INTL INC        COM             88023U101        9       800 SH                                 800      0    0
THERMO FISHER SCIENTIFIC INC COM             883556102        6       100 SH                                 100      0    0
TIFFANY & CO NEW             COM             886547108        4       100 SH                                 100      0    0
TIME WARNER CABLE INC        CL A            88732J108       25     1,000 SH                               1,000      0    0
ULTA SALON COSMETCS & FRAG I COM             90384S303        1       100 SH                                 100      0    0
UNITEDHEALTH GROUP INC       COM             91324P102       31       900 SH                                 900      0    0
URBAN OUTFITTERS INC         COM             917047102       16       500 SH                                 500      0    0
US BANCORP DEL               COM NEW         902973304      129     4,000 SH                               4,000      0    0
VASCO DATA SEC INTL INC      COM             92230Y104        8       600 SH                                 600      0    0
VCA ANTECH INC               COM             918194101       16       600 SH                                 600      0    0
VERIFONE HLDGS INC           COM             92342Y109        8       500 SH                                 500      0    0
VITAL SIGNS INC              COM             928469105        8       157 SH                                 157      0    0
WARNER CHILCOTT LIMITED      COM CL A        G9435N108       29     1,600 SH                               1,600      0    0
WASTE MGMT INC DEL           COM             94106L109      338    10,081 SH                              10,081      0    0
WEST PHARMACEUTICAL SVSC INC COM             955306105       27       600 SH                                 600      0    0
WILLIAMS PARTNERS L P        COM UNIT L P    96950F104       22       700 SH                                 700      0    0
WISCONSIN ENERGY CORP        COM             976657106       22       500 SH                                 500      0    0
WRIGLEY WM JR CO             COM             982526105       25       400 SH                                 400      0    0
XTO ENERGY INC               COM             98385X106       43       700 SH                                 700      0    0
YINGLI GREEN ENERGY HLDG CO  ADR             98584B103       41     2,400 SH                               2,400      0    0