UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 13F Form 13F COVER PAGE Report for the Calendar Year or Quarter Ended: June 30, 2011 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: Cowen Group, Inc. Address: 599 Lexington Avenue, 2Oth Flr. New York, NY 10022 13F File Number: 028-NEW 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: Owen Littman Title: General Counsel Phone: 212-201-4841 Signature, Place, and Date of Signing: /s/ Owen Littman New York, NY August 15, 2011 Report Type (Check only one.): [ X] 13F HOLDINGS REPORT. [ ] 13F NOTICE. [ ] 13F COMBINATION REPORT. FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 5 Form 13F Information Table Entry Total: 326 Form 13F Information Table Value Total: $827,275 (thousands) List of Other Included Managers: Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional managers with respect to which this report is filed, other than the manager filing this report. No. 13F File Number Name 05 028-NEW Cowen and Company LLC 01 028-06309 Ramius LLC 02 028-10674 Ramius Advisors, LLC 03 028-14361 Ramius Alternative Solutions LLC 04 028-10501 Cowen Capital LLC FORM 13F INFORMATION TABLE VALUE SHARES/ SH/ PUT/ INVSTMT OTHER VOTING AUTHORITY NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DSCRETN MANAGERS SOLE SHARED NONE ------------------------------ ---------------- --------- -------- -------- --- ---- ------- ------------ -------- -------- -------- ABOVENET INC COM 00374N107 1762 25000 SH CALL DEFINED 02 25000 0 0 ADVANCED ANALOGIC TECHNOLOGI COM 00752J108 930 153667 SH DEFINED 02 153667 0 0 AGL RES INC COM 001204106 1706 41910 SH DEFINED 02 41910 0 0 AGL RES INC COM 001204106 6 147 SH DEFINED 05 147 0 0 AGRIUM INC COM 008916108 709 8074 SH DEFINED 04 8074 0 0 AGRIUM INC COM 008916108 1843 21000 SH PUT DEFINED 04 21000 0 0 ALCOA INC COM 013817101 4758 300000 SH CALL DEFINED 04 300000 0 0 ALLERGAN INC COM 018490102 1457 17500 SH CALL DEFINED 05 17500 0 0 ALLIED WRLD ASSUR COM HLDG A SHS H01531104 288 5000 SH CALL DEFINED 02 5000 0 0 AMGEN INC COM 031162100 414 7098 SH DEFINED 04 7098 0 0 AMGEN INC NOTE 0.375% 2/0 031162AQ3 684 680000 PRN DEFINED 05 680000 0 0 AMYLIN PHARMACEUTICALS INC COM 032346108 200 15000 SH CALL DEFINED 05 15000 0 0 ARCH COAL INC COM 039380100 35 1331 SH DEFINED 05 1331 0 0 ARCH COAL INC COM 039380100 1016 38100 SH CALL DEFINED 05 38100 0 0 ARIAD PHARMACEUTICALS INC COM 04033A100 1416 125000 SH DEFINED 02 125000 0 0 AUTOZONE INC COM 053332102 886 3002 SH DEFINED 05 3002 0 0 AUTOZONE INC COM 053332102 737 2500 SH CALL DEFINED 05 2500 0 0 AVANIR PHARMACEUTICALS INC CL A NEW 05348P401 164 48600 SH PUT DEFINED 05 48600 0 0 AVANIR PHARMACEUTICALS INC CL A NEW 05348P401 151 45000 SH DEFINED 05 45000 0 0 AVANIR PHARMACEUTICALS INC CL A NEW 05348P401 458 136100 SH CALL DEFINED 05 136100 0 0 BALL CORP COM 058498106 5958 154900 SH CALL DEFINED 05 154900 0 0 BARCLAYS BK PLC DJUBS CMDT ETN36 06738C778 10386 219900 SH DEFINED 03 219900 0 0 BARCLAYS BK PLC IPATH S&P MT ETN 06740C519 9559 189768 SH DEFINED 03 189768 0 0 BARCLAYS BK PLC IPTH S&P VIX NEW 06740C261 370 17500 SH DEFINED 02 17500 0 0 BARCLAYS BK PLC IPTH S&P VIX NEW 06740C261 1786 84500 SH DEFINED 03 84500 0 0 BARCLAYS BK PLC IPTH S&P VIX NEW 06740C261 846 40000 SH CALL DEFINED 02 40000 0 0 BARNES & NOBLE INC COM 067774109 1245 75100 SH PUT DEFINED 02 75100 0 0 BIOGEN IDEC INC COM 09062X103 3165 29600 SH CALL DEFINED 04 29600 0 0 BIONOVO INC COM NEW 090643206 344 450000 SH DEFINED 05 450000 0 0 BIONOVO INC COM NEW 090643206 342 447048 SH DEFINED 02 447048 0 0 BJS WHOLESALE CLUB INC COM 05548J106 2130 42300 SH PUT DEFINED 02 42300 0 0 BJS WHOLESALE CLUB INC COM 05548J106 1511 30000 SH DEFINED 02 30000 0 0 BJS WHOLESALE CLUB INC COM 05548J106 1536 30500 SH CALL DEFINED 02 30500 0 0 BLACKBOARD INC COM 091935502 29 679 SH DEFINED 05 679 0 0 BLACKBOARD INC COM 091935502 334 7700 SH CALL DEFINED 02 7700 0 0 BMC SOFTWARE INC COM 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COWEN GROUP INC NEW CL A 223622101 332 88334 SH DEFINED 02 88334 0 0 COWEN GROUP INC NEW CL A 223622101 1 370 SH DEFINED 05 370 0 0 CREDIT SUISSE NASSAU BRH ETN IDX-LKD 20 22542D845 13144 630709 SH DEFINED 03 630709 0 0 CROWN HOLDINGS INC COM 228368106 4134 106500 SH CALL DEFINED 05 106500 0 0 CUBIST PHARMACEUTICALS INC NOTE 2.500%11/0 229678AD9 2798 2000000 PRN DEFINED 05 2000000 0 0 CURRENCYSHARES AUSTRALIAN DL AUSTRALIAN DOL 23129U101 216 2000 SH CALL DEFINED 04 2000 0 0 CURRENCYSHS BRIT POUND STER BRIT POUND STE 23129S106 1000 6277 SH DEFINED 04 6277 0 0 CURRENCYSHS JAPANESE YEN TR JAPANESE YEN 23130A102 1958 15978 SH DEFINED 04 15978 0 0 D R HORTON INC COM 23331A109 970 84200 SH PUT DEFINED 05 84200 0 0 DELCATH SYS INC COM 24661P104 11 2152 SH DEFINED 04 2152 0 0 DELCATH SYS INC COM 24661P104 116 22500 SH DEFINED 05 22500 0 0 DELCATH SYS INC COM 24661P104 5 1000 SH CALL DEFINED 04 1000 0 0 DELCATH SYS INC COM 24661P104 387 75000 SH CALL DEFINED 05 75000 0 0 DELCATH SYS INC COM 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375558103 1483 35800 SH CALL DEFINED 05 35800 0 0 GILEAD SCIENCES INC COM 375558103 828 20000 SH PUT DEFINED 05 20000 0 0 GOLDCORP INC NEW COM 380956409 1566 32450 SH DEFINED 04 32450 0 0 GOLDMAN SACHS GROUP INC COM 38141G104 3327 25000 SH PUT DEFINED 02 25000 0 0 GRAHAM PACKAGING CO INC COM 384701108 3123 123839 SH DEFINED 02 123839 0 0 GSI COMMERCE INC COM 36238G102 2603 88000 SH CALL DEFINED 02 88000 0 0 HALLIBURTON CO COM 406216101 255 5000 SH PUT DEFINED 04 5000 0 0 HALLIBURTON CO COM 406216101 5355 105000 SH CALL DEFINED 04 105000 0 0 HARTFORD FINL SVCS GROUP INC COM 416515104 185 7000 SH DEFINED 05 7000 0 0 HARTFORD FINL SVCS GROUP INC COM 416515104 2460 93300 SH PUT DEFINED 05 93300 0 0 HUMAN GENOME SCIENCES INC COM 444903108 1963 80000 SH CALL DEFINED 05 80000 0 0 INDEXIQ ETF TR US RL EST SMCP 45409B628 372 17871 SH DEFINED 05 17871 0 0 INTEL CORP SDCV 2.950%12/1 458140AD2 1101 1050000 PRN DEFINED 05 1050000 0 0 INTERNATIONAL BUSINESS MACHS COM 459200101 858 5000 SH DEFINED 02 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192 3063 SH DEFINED 04 3063 0 0 ISHARES INC MSCI NETHR INVES 464286814 216 10021 SH DEFINED 04 10021 0 0 ISHARES INC MSCI SINGAPORE 464286673 583 42479 SH DEFINED 04 42479 0 0 ISHARES INC MSCI SINGAPORE 464286673 4 300 SH CALL DEFINED 04 300 0 0 ISHARES INC MSCI SPAIN 464286764 3796 90092 SH DEFINED 04 90092 0 0 ISHARES INC MSCI STH AFRCA 464286780 1385 19485 SH DEFINED 04 19485 0 0 ISHARES INC MSCI SWEDEN 464286756 101 3174 SH DEFINED 04 3174 0 0 ISHARES INC MSCI SWITZERLD 464286749 179 6744 SH DEFINED 04 6744 0 0 ISHARES INC MSCI TAIWAN 464286731 759 50000 SH DEFINED 04 50000 0 0 ISHARES S&P GSCI COMMODITY I UNIT BEN INT 46428R107 2741 80352 SH DEFINED 03 80352 0 0 ISHARES SILVER TRUST ISHARES 46428Q109 338 10000 SH DEFINED 02 10000 0 0 ISHARES TR BARCLYS TIPS BD 464287176 1067 9643 SH DEFINED 04 9643 0 0 ISHARES TR DJ US REAL EST 464287739 10 165 SH DEFINED 04 165 0 0 ISHARES TR FTSE CHINA25 IDX 464287184 2631 61252 SH DEFINED 04 61252 0 0 ISHARES TR HIGH YLD CORP 464288513 38686 423681 SH DEFINED 03 423681 0 0 ISHARES TR MSCI EAFE INDEX 464287465 1210 20115 SH DEFINED 03 20115 0 0 ISHARES TR MSCI EMERG MKT 464287234 952 20000 SH CALL DEFINED 04 20000 0 0 ISHARES TR MSCI EMERG MKT 464287234 9520 200000 SH PUT DEFINED 02 200000 0 0 ISHARES TR MSCI EMERG MKT 464287234 714 15000 SH PUT DEFINED 04 15000 0 0 ISHARES TR MSCI PERU CAP 464289842 1184 31460 SH DEFINED 04 31460 0 0 ISHARES TR RUSSELL 2000 464287655 19458 235000 SH PUT DEFINED 02 235000 0 0 ISHARES TR S&P SMLCAP 600 464287804 527 7186 SH DEFINED 05 7186 0 0 ISHARES TR US PFD STK IDX 464288687 40 1000 SH CALL DEFINED 04 1000 0 0 ISHARES TR US PFD STK IDX 464288687 40 1000 SH PUT DEFINED 04 1000 0 0 JOHNSON & JOHNSON COM 478160104 241 3630 SH DEFINED 02 3630 0 0 JOHNSON & JOHNSON COM 478160104 0 3 SH DEFINED 05 3 0 0 JPMORGAN CHASE & CO COM 46625H100 1228 30000 SH CALL DEFINED 04 30000 0 0 JPMORGAN CHASE & CO COM 46625H100 4606 112500 SH CALL DEFINED 05 112500 0 0 K V PHARMACEUTICAL CO CL A 482740206 608 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