<SEC-DOCUMENT>0001350312-11-000007.txt : 20111012
<SEC-HEADER>0001350312-11-000007.hdr.sgml : 20111012
<ACCEPTANCE-DATETIME>20111012151001
ACCESSION NUMBER:		0001350312-11-000007
CONFORMED SUBMISSION TYPE:	13F-HR
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20110930
FILED AS OF DATE:		20111012
DATE AS OF CHANGE:		20111012
EFFECTIVENESS DATE:		20111012

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Rail-Splitter Capital Management, LLC
		CENTRAL INDEX KEY:			0001350312
		IRS NUMBER:				731628864

	FILING VALUES:
		FORM TYPE:		13F-HR
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	028-11592
		FILM NUMBER:		111137459

	BUSINESS ADDRESS:	
		STREET 1:		20 N. WACKER DRIVE
		STREET 2:		SUITE 4120
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606
		BUSINESS PHONE:		312-629-4950

	MAIL ADDRESS:	
		STREET 1:		20 N. WACKER DRIVE
		STREET 2:		SUITE 4120
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606
</SEC-HEADER>
<DOCUMENT>
<TYPE>13F-HR
<SEQUENCE>1
<FILENAME>rs3q11.txt
<TEXT>
                               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, 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:     Rail-Splitter Capital Managemet
Address:  303 W. Madison St. - Suite 1325
	  Chicago, IL  60606

13 File Number:

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
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:      Kurt D. Koeplin
Title:     CFO
Phone:     312.629.4952
Signature, 			Place and 	Date of Signing:
Kurt D. Koeplin			Chicago, IL	_________________10/12/2011______________

Report Type (Check only one.):
[ X]        13F HOLDINGS REPORT.
[  ]        13F NOTICE.
[  ]        13F COMBINATION REPORT.


I AM SIGNING THIS REPORT AS REQUIRED BY THE SECURITIES EXCHANGE
ACT OF 1934
<PAGE>
                           FORM 13F SUMMARY PAGE


Report Summary:

Number of Other Included Managers:        1

Form 13F Information Table Entry Total:    50

Form 13F Information Table Value Total:  327,963


<PAGE>
<TABLE>                          <C>               <C>
                                                                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 		DISCRETN MANAGERS   SOLE   	 SHARED    NONE
  --------------	---------------- ---------------- --------- -------- -------- --- ---- -------- --------- -------- --------  ----
GROUPE AEROPLAN INC CMN		COMMON STOCK	B3B9M11	 	 6,442 	 563,800 	SH		Share Defined	1		563800	0
ABERCROMBIE & FITCH CO. CLASS A COMMON STOCK	002896207	 6,156 	 100,000 	SH		Share Defined	1		100000	0
ADVANCED AUTO PARTS INC CMN	COMMON STOCK	00751Y106	 7,263 	 125,000 	SH		Share Defined	1		125000	0
AFFILIATED MANAGERS GROUP INC   COMMON STOCK	008252108	 5,476 	 70,165 	SH		Share Defined	1		70165	0
AIRGAS INC CMN			COMMON STOCK	009363102	 7,626 	 119,500 	SH		Share Defined	1		119500	0
ALLIANCE DATA SYSTEMS CORP	COMMON STOCK	018581108	 12,591  135,826 	SH		Share Defined	1		135826	0
AMERICAN TOWER CORPORATION 	COMMON STOCK	029912201	 13,189  245,145 	SH		Share Defined	1		245145	0
APPLE, INC. CMN			COMMON STOCK	037833100	 13,765  36,098 	SH		Share Defined	1		36098	0
ARCOS DORADOS HOLDINGS INC CMN	COMMON STOCK	G0457F107	 2,117 	 91,300 	SH		Share Defined	1		91300	0
BALCHEM CORPORATION CMN		COMMON STOCK	057665200	 1,362 	 36,500 	SH		Share Defined	1		36500	0
CHECK POINT SOFTWARE TECH. LTD 	COMMON STOCK	M22465104	 11,355  215,219 	SH		Share Defined	1		215219	0
CME GROUP INC. CMN CLASS A	COMMON STOCK	12572Q105	 6,479 	 26,295 	SH		Share Defined	1		26295	0
COGNIZANT TECHNOLOGY SOLUTIONS 	COMMON STOCK	192446102	 5,047 	 80,488 	SH		Share Defined	1		80488	0
CROCS, INC. CMN			COMMON STOCK	227046109	 5,755 	 243,052 	SH		Share Defined	1		243052	0
CVS CAREMARK CORPORATION CMN	COMMON STOCK	126650100	 5,555 	 165,379 	SH		Share Defined	1		165379	0
DICKS SPORTING GOODS INC CMN	COMMON STOCK	253393102	 7,612 	 227,500 	SH		Share Defined	1		227500	0
ENDOLOGIX INC CMN		COMMON STOCK	29266S106	 5,830 	 580,645 	SH		Share Defined	1		580645	0
ENERGY XXI (BERMUDA) LTD CMN	COMMON STOCK	G10082140	 4,079 	 189,900 	SH		Share Defined	1		189900	0
EXAMWORKS GROUP, INC. CMN	COMMON STOCK	30066A105	 1,986 	 195,100 	SH		Share Defined	1		195100	0
FOSSIL INC CMN			COMMON STOCK	349882100	 8,945 	 110,350 	SH		Share Defined	1		110350	0
GILEAD SCIENCES CMN		COMMON STOCK	375558103	 8,558 	 220,574 	SH		Share Defined	1		220574	0
GREEN MNTN COFFEE ROASTERS 	COMMON STOCK	393122106	 9,177 	 98,740 	SH		Share Defined	1		98740	0
HANSEN NATURAL CORP CMN		COMMON STOCK	411310105	 4,832 	 55,360 	SH		Share Defined	1		55360	0
HARLEY-DAVIDSON INC CMN		COMMON STOCK	412822108	 6,650 	 193,702 	SH		Share Defined	1		193702	0
HIGHER ONE HOLDINGS, INC. CMN	COMMON STOCK	42983D104	 1,768 	 108,640 	SH		Share Defined	1		108640	0
INFORMATICA CORP CMN		COMMON STOCK	45666Q102	 5,286 	 129,096 	SH		Share Defined	1		129096	0
INTEGRATED DEVICE TECH INC CMN	COMMON STOCK	458118106	 4,627 	 898,381 	SH		Share Defined	1		898381	0
KOHL'S CORP (WISCONSIN) CMN	COMMON STOCK	500255104	 4,912 	 100,034 	SH		Share Defined	1		100034	0
KROGER COMPANY CMN		COMMON STOCK	501044101	 5,197 	 236,640 	SH		Share Defined	1		236640	0
MASTERCARD INCORPORATED CMN 	COMMON STOCK	57636Q104	 9,298 	 29,316 	SH		Share Defined	1		29316	0
MERGE HEALTHCARE INC. CMN	COMMON STOCK	589499102	 9,059 	 1,487,521 	SH		Share Defined	1		1487521	0
NPS PHARMACEUTICALS INC CMN	COMMON STOCK	62936P103	 4,725 	 725,781 	SH		Share Defined	1		725781	0
PARAMETRIC TECHNOLOGY CORP	COMMON STOCK	699173209	 4,671 	 303,724 	SH		Share Defined	1		303724	0
PAREXEL INTERNATIONAL CORP CMN	COMMON STOCK	699462107	 8,868 	 468,461 	SH		Share Defined	1		468461	0
PETSMART, INC. CMN		COMMON STOCK	716768106	 10,723  251,429 	SH		Share Defined	1		251429	0
PRAXAIR, INC CMN SERIES		COMMON STOCK	74005P104	 7,891 	 84,417 	SH		Share Defined	1		84417	0
PRECISION CASTPARTS CORP. CMN	COMMON STOCK	740189105	 4,434 	 28,524 	SH		Share Defined	1		28524	0
QUALCOMM INC CMN		COMMON STOCK	747525103	 10,511  216,152 	SH		Share Defined	1		216152	0
SELECT COMFORT CORPORATION CMN	COMMON STOCK	81616X103	 3,859 	 276,216 	SH		Share Defined	1		276216	0
SODASTREAM INTERNATIONAL 	COMMON STOCK	M9068E105	 5,325 	 161,130 	SH		Share Defined	1		161130	0
SOLERA HOLDINGS INC CMN		COMMON STOCK	83421A104	 4,578 	 90,650 	SH		Share Defined	1		90650	0
STAPLES, INC. CMN		COMMON STOCK	855030102	 5,635 	 423,700 	SH		Share Defined	1		423700	0
TEMPUR-PEDIC INTL INC. CMN	COMMON STOCK	88023U101	 3,215 	 61,115 	SH		Share Defined	1		61115	0
THE FRESH MARKET, INC. CMN	COMMON STOCK	35804H106	 12,374  324,278 	SH		Share Defined	1		324278	0
THERMON GROUP HOLDINGS, INC. 	COMMON STOCK	88362T103	 5,726 	 414,300 	SH		Share Defined	1		414300	0
UNITEDHEALTH GROUP INCORPORATE*	COMMON STOCK	91324P102	 6,904 	 149,700 	SH		Share Defined	1		149700	0
VALEANT PHARMACEUTICALS INTL 	COMMON STOCK	91911K102	 4,699 	 126,600 	SH		Share Defined	1		126600	0
VODAFONE GROUP PLC SPONSORED 	COMMON STOCK	92857W209	 5,701 	 222,163 	SH		Share Defined	1		222163	0
WEBMD HEALTH CORP. CMN		COMMON STOCK	94770V102	 6,030 	 200,000 	SH		Share Defined	1		200000	0
BM&F BOVESPA SA CMN 		COMMON STOCK	B2RHNV9	 	 4,098 	 879,017 	SH		Share Defined	1		879017	0


Records	50	Total Mkt Value	327,963


</table>


</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>