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

FORM 13F

FORM 13F COVER PAGE

REPORT FOR THE QUARTER ENDED:  09/28/01

CHECK HERE IF AMENDMENT  [   ];  AMENDMENT NUMBER:
THIS AMENDMENT (CHECK ONE ONLY):  [   ] IS A RESTATEMENT
                                  [   ] ADDS NEW HOLDINGS
ENTRIES.
INSTITUTIONAL INVESTMENT MANAGER FILING THIS REPORT:
NAME:    LIBERTY WANGER ASSET MANAGEMENT, LP
ADRESS:  227 W MONROE
         SUITE 3000
         CHICAGO, IL  60606

13F FILE NUMBER: 801-41391

THE INSTITUTIONAL INVESTMENT MANAGER FILING THIS REORT AND
THE PERSON TO WHOM IT IS SIGNED HEREBY REPRESENT THAT THE
PERSON SIGNING THE REPORT IS AUTHORIZED TO SUBMIT IT, THAT
ALL INFORMATION CONTAINED HERIN 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:     BRUCE H. LAUER
TITLE:    CHIEF ADMINISTRATIVE OFFICER
PHONE:    312 634 9230
SIGNATURE, PLACE, AND DATE OF SIGNING

BRUCE H. LAUER     CHICAGO, ILLINOIS        SEPTEMBER 18, 2001

REPORT TYPE (CHECK ONLY ONE):

[ X ]  13F HOLDINGS REPORT

[   ]  13F NOTICE

[   ]  13 F COMBINATION REPORT

LIST OF OTHER MANAGERS REPORTING FOR THIS
MANAGER:




I AM SIGNING THIS REPORT AS REQUIRED BY

THE SECURITIES EXCHANGE ACT OF 1934.



FORM 13F SUMMARY PAGE

REPORT SUMMARY:

NUMBER OF OTHER INCLUDED MANAGERS:       2

FORM 13F INFORMATION TABLE ENTRY TOTAL: 269

FORM 13F INFORMATION TABLE VALUE TOTAL: $4,686,948

LIST OF OTHER INCLUDED MANAGERS:
NO. 13F FILE NUMBER  NAME
01  28-4798          LIBERTY ACORN INVESTMENT TRUST
02  28-5842          WANGER ADVISORS TRUST













Name Of Issuer	 	Class	Cusip		Share Total	Ticker  Fair Market
									Value ( in 000'S)

ACTEL CORP		CS	004934105	180,000		ACTL	3,197
ACTIVISION INC		CS	004930202	535,000		ATVI	14,563
ADVANCED LIGHTING	CS	00753C102	931,400		ADLT	1,602
AFFILIATED MANAGERS	CS	008252108	1,320,000	AMG	74,989
AIRNET SYSTEMS		CS	009417106	600,000		ANS	3,486
AMDOCS			FS	G02602103	372,200		DOX	9,919
AMERICAN DENTAL		CS	025353103	409,000		ADPI	3,068
AMERICAN MANAGEMENT	CS	027352103	1,214,000	AMSY	14,580
AMERICAN POWER CONVE	CS	029066107	503,000		APCC	5,875
AMERICREDIT CORP	CS	03060R101	5,936,900	ACF	187,725
AMETEK INC		CS	031100100	595,000		AME	15,637
AMLI RESIDENTIAL	CS	001735109	650,000		AML	15,340
ANALYSTS INTERNATION	CS	032681108	1,006,000	ANLY	3,068
ANCHOR BANCORP WI	CS	032839102	579,200		ABCW	9,615
ANCHOR GAMING		CS	033037102	1,070,000	SLOT	44,405
APPLIED INDUSTRIAL T	CS	03820C105	652,000		AIT	11,012
AQUILA INC.		CS	03840J106	738,100		ILA	16,091
ASE TEST		FS	Y02516105	600,000		ASTSF	4,620
ASPECT TELECOM		CS	04523Q102	347,800		ASPT	623
ASSOCIATED BANCORP	CS	045487105	1,128,000	ASBC	38,228
ASYST TECH INC		CS	04648X107	630,200		ASYT	5,703
ATCHISON CASTING	CS	046613105	593,400		FDY	1,786
ATMOS ENERGY		CS	049560105	1,162,000	ATO	25,099
AUTOLIV			FS	052800109	577,400		ALV	9,088
AVNET INC		CS	053807103	540,000		AVT	9,823
AVOCENTCORP		CS	053893103	452,000		AVCT	6,726
AXCELIS TECH		CS	054540109	1,285,000	ACLS	12,143
BALLY TOTAL FITNESS	CS	05873K108	2,008,000	BFT	40,782
BEVERLY ENTERPRISES	CS	087851309	2,375,000	BEV	24,225
BIGFOOT IMS INC		PC	089990949	263,158		BIG-IMS	1
BIGFOOT INTL		CS	409992948	2,683		BIGFOOT	134
BKF CAPITAL GROUP	CS	05548G102	352,900		BKF	9,528
BORDERS GROUP INC	CS	099709107	2,175,000	BGP	41,651
BOSTON SCIENTIFIC	CS	101137107	475,000		BSX	9,738
BRE PROPERTIES		CS	05564E106	535,000		BRE	16,023
BSQUARE CORP.		CS	11776U102	1,550,000	BSQR	4,108
CADIZ INC		CS	127537108	720,000		CLCI	6,170
CALLOWAY GOLF		CS	131193104	2,200,000	ELY	28,160
CAPITAL TRUST		CS	14052H100	1,837,300	CT	10,105
CARBO CERAMICS		CS	140781105	670,000		CRR	18,559
CARNIVAL CORP		CS	143658102	1,583,000	CCL	34,858
CH ENERGY GROUP INC	CS	12541M102	200,000		CHG	8,120
CHELSEA PROPERTY	CS	163421100	100,000		CPG	4,545
CHESTER COUNTY, PA 4	MB	165578AU	100,000		#APA01	100
CHILES OFFSHORE		CS	16888M104	767,800		COD	15,510
CHITTENDEN CORP		CS	170228100	955,000		CHZ	24,257
CHOICEPOINT INC		CS	170388102	638,500		CPS	26,587
CHRISTOPHER& BANKS	CS	171046105	1,122,000	CHBS	33,783
CIBER INC.		CS	17163B102	2,594,800	CBR	16,347
CINAR CORP		FS	171905300	425,000		CINRB	1,233
CITIZENS UTILS CO DE	CS	17453B101	25,160		CZN	237
CLARCOR INC		CS	179895107	1,781,000	CLC	42,566
CLICKSOFTWARE TECHS	CS	M25082104	1,660,000	CKSW	1,677
COACH INC		CS	189754104	820,000		COH	21,738
COMARCO INC		CS	200080109	1,293,950	CMRO	16,368
COMMONWEALTH BANCORP	CS	20268X102	894,000		CMSB	18,434
COMMONWEALTH TELEPHO	CS	203349105	1,031,300	CTCO	37,900
CONCORD EFS INC		CS	206197105	722,500		CEFT	35,366
CONECTIV		CS	206829103	1,845,000	CIV	43,358
CONSOLIDATED TOMOKA	CS	210226106	275,400		CTO	5,715
CORVAS INTERNATIONAL	CS	221005101	1,383,000	CVAS	7,952
COVANTA ENERGY		CS	22281N103	960,000		COV	11,213
CUBIC CORP		CS	229669106	235,000		CUB	8,108
CUMULUS MEDIA		CS	231082108	280,000		CMLS	1,946
DENVER GO 5.25		MB	2491637L	200,000		#DCO04	205
DIONEX			CS	254546104	457,800		DNEX	11,546
DIVERSA CORP		CS	255064107	423,300		DVSA	3,979
DREYFUS MUN BD FD CO	MF	26201Q104	109,017		DRTAX	1,304
DVI INC			CS	233343102	1,120,000	DVI	19,029
DYNEGY INC		CS	26816Q101	2,304,800	DYN	79,861
EATON VANCE CORP	CS	278265103	397,000		EV	12,446
EDWARDS LIFESCIENCES	CS	28176E108	1,282,000	EW	28,717
ELAN PHARM		AD	284131208	12,000		ELN	581
EMBRAER AIRCRAFT	FS	29081M102	131,500		ERJ	1,677
EQUITABLE RESOURCES	CS	294549100	1,774,600	EQT	53,256
EQUITY OFFICE PROP	CS	294741103	155,000		EOP	4,960
EQUITY RESIDENTIAL P	CS	29476L107	9,000		EQR	526
EURONET WORLDWIDE	FS	298736109	244,000		EEFT	2,696
EVERGREEN RESOURCES	CS	299900308	754,500		EVG	25,615
EXCEL TECH		CS	30067T103	355,000		XLTC	5,584
EXPEDITORS INTL WASH	CS	302130109	1,907,000	EXPD	90,296
FIRST HEALTH GROUP	CS	320960107	4,766,000	FHCC	140,025
FIRST INDUSTRIAL	CS	32054K103	895,000		FR	26,850
FIRST YEARS INC		CS	337610109	641,000		KIDD	6,634
FMC TECHNOLOGIES	CS	30249U101	964,000		FTI	11,134
FOREST CITY ENT CL A	CS	345550107	100,000		FCE.A	4,800
FOREST CITY ENT CL B	CS	345550305	466,000		FCE.B	22,578
FORWARD AIR		CS	349853101	840,000		FWRD	19,774
FURNITURE BRANDS	CS	360921100	685,500		FBN	13,354
GADZOOKS INC		CS	362553109	1,352,000	GADZ	18,590
GAIAM			CS	36268Q103	340,000		GAIA	5,352
GENE LOGIC INC		CS	368689105	252,000		GLGC	3,316
GENERAL GROWTH PROP	CS	370021107	450,000		GGP	15,647
GENZYME MOLECULAR	CS	372917500	380,000		GZMO	2,945
GETTY IMAGES INC	CS	374276103	1,748,500	GETY	19,286
GIBRALTAR STEEL CORP	CS	37476F103	1,065,000	ROCK	16,082
GLACIER BANCORP		CS	37637Q105	386,200		GBCI	7,338
GLOBAL PAYMENTS		CS	37940X102	1,933,040	GPN	56,831
GP STRATEGIES CORP	CS	36225V104	820,000		GPX	3,239
GPO AEROPORTUARIO	AD	40051E202	626,500		ASR	5,889
GROUP 1 SOFTWARE	CS	39943Y103	158,100		GSOF	1,576
GUILFORD PHARM		CS	401829106	381,000		GLFD	3,280
H & R BLOCK INC		CS	093671105	205,000		HRB	7,905
HAEMONETICS CORP	CS	405024100	350,000		HAE	12,114
HARLEY DAVIDSON INC	CS	412822108	2,128,000	HDI	86,184
HCC INSURANCE HLDGS	CS	404132102	1,340,000	HCC	35,242
HELEN OF TROY		CS	G4388N106	2,700,000	HELE	28,215
HERMAN MILLER		CS	600544100	1,137,000	MLHR	22,137
HON INDUSTRIES INC	CS	438092108	540,000		HNI	11,858
HUB GROUP		CS	443320106	1,403,300	HUBG	14,875
HYPERION SOLUTIONS	CS	44914M104	795,000		HYSL	10,621
IGATE CAPITAL		CS	45169U105	2,845,400	IGTE	7,170
IL HEALTH FACILITIES	MB	45200KYL	75,000		#ILL03	76
IMMUNEX CORP		CS	452528102	225,000		IMNX	4,203
INDUS INTERNATIONAL	CS	45578L100	1,440,000	IINT	8,582
INFORMATION HOLDINGS	CS	456727106	991,500		IHI	19,473
INFOUSA INC		CS	456818301	2,900,000	IUSA	11,774
INHALE THERAPEUTIC S	CS	457191104	598,000		INHL	7,953
INSIGHT COMMS		CS	45768V108	200,000		ICCI	3,680
INSITUFORM TECH		CS	457667103	200,000		INSUA	3,410
INSURANCE AUTO AUCTI	CS	457875102	664,000		IAAI	8,964
INTEGRATED CIRCUIT	CS	45811K208	890,000		ICST	11,374
INTERMAGNETICS GEN	CS	458771102	294,800		IMGC	6,857
INTERNATIONAL GAME T	CS	459902102	2,397,000	IGT	101,873
INVESTMENT CO. OF CH	FS	045933009	300,000		INVCHINA 1,155
ISLE OF CAPRI		CS	464592104	1,250,000	ISLE	8,874
ITT EDUCATIONAL		CS	45068B109	2,546,000	ESI	81,472
J D EDWARDS & CO	CS	281667105	3,780,000	JDEC	26,914
JABIL CIRCUIT		CS	466313103	361,000		JBL	6,462
JACKSONVILLE ELECTRI	MB	4693632K	50,000		#JFL02	50
JACKSONVILLE POWER	MB	469364DV2	150,000		JACPWR	153
JDA SOFTWARE GROUP	CS	46612K108	2,620,000	JDAS	34,427
JONES APPAREL		CS	480074103	1,765,777	JNY	45,010
KHANTY MANSISYK ORD	FS	649991916	8,083		KMOC	4,244
KHANTY MANSIYSK		CB	649992922	1,500,000	KHANTY	1,500
KRONOS INC		CS	501052104	1,132,800	KRON	46,501
LABOR READY		CS	505401208	3,181,000	LRW	10,147
LAKES GAMING INC	CS	51206P109	113,000		LACO	627
LASALLE HOTEL PROP	CS	517942108	1,444,000	LHO	13,343
LEUCADIA NATIONAL CO	CS	527288104	728,000		LUK	22,714
LIBERTY MEDIA CORP	CS	530718105	3,671,848	LMC.A	46,632
LINCARE HOLDINGS INC	CS	532791100	2,400,800	LNCR	63,789
LOCUS			CS	54099C979	2,500,000	LOCUS	10,000
LOUIS DREYFUS		CS	546011107	525,000		LD	20,423
MACERICH CO.		CS	554382101	625,000		MAC	13,813
MAGELLAN HEALTH SERV	CS	559079108	1,448,800	MGL	16,618
MANUFACTURED HOME CO	CS	564682102	787,300		MHC	23,950
MAPICS INC		CS	564910107	2,276,000	MAPX	12,791
MARKEL CORP		CS	570535104	146,988		MKL	28,663
MAVERICK TUBE CORP	CS	577914104	1,606,800	MVK	14,558
MAXYGEN			CS	577776107	325,000		MAXY	5,150
MDSI-MOBILE DATA SOL	FS	55268N100	152,600		MDSI	429
MEDIACOM COMM		CS	58446K105	1,810,000	MCCC	23,584
MERCANTILE BANK		CS	587405101	83,000		MRBK	3,295
METABOLEX SERIES F P	PS	591014998	363,636		MBOLEX	582
METTLER TOLEDO INT'L	CS	592688105	379,000		MTD	15,971
MICHAELS STORES		CS	594087108	490,000		MIKE	17,905
MICROCIDE		CS	595018102	795,000		MCDE	2,496
MICRODOSE TECH		CS	596999995	326,000		MICRODOS 601
MICROS SYSTEMS		CS	594901100	2,182,500	MCRS	38,783
MICROSEMI CORP		CS	595137100	390,000		MSCC	10,160
MIH LTD			FS	G6116R101	834,000		MIHL	6,547
MILLENNIUM CELL		CS	60038B105	800,000		MCEL	2,992
MOBILE MINI INC		CS	60740F105	650,000		MINI	16,874
MOHAWK INDUSTRIES	CS	608190104	470,000		MHK	17,273
MONACO COACH		CS	60886R103	1,184,700	MNC	16,882
MONARCH CASINO AND R	CS	609027107	752,700		MCRI	4,514
MRO SOFTWARE		CS	55347W105	758,000		MROI	7,732
MULTEX.COM INC.		CS	625367107	3,266,000	MLTX	6,761
MYRIAD GENETICS		CS	62855J104	234,000		MYGN	7,170
NATIONAL DATA CORP	CS	635621105	2,850,800	NDC	102,629
NAUTICA			CS	639089101	1,084,000	NAUT	12,835
NAVIGANT CONSULTING	CS	63935N107	3,120,000	NCI	11,575
NEO PLANET		PS	64099B921	53,376		NPLANETB 27
NEOPLANET INC SERIES	PS	640994935	250,000		NPLANET	125
NEUBERGER BERMAN	CS	641234109	1,373,399	NEU	47,904
NEVADA STATE GO 4.50	MB	641459ZS	90,000		#NEV05	90
NEW HORIZONS WW		CS	645526104	475,000		NEWH	5,474
NEWPARK RESOURCE	CS	651718504	5,697,000	NR	38,455
NEXELL THERAPEUTICS	CS	65332H203	147		NEXL	0
NORTHWEST PIPE CO.	CS	667746101	97,000		NWPX	1,455
NOVELL INC		CS	670006105	8,335,000	NOVL	30,506
NOVOSTE CORP		CS	67010C100	1,489,300	NOVT	8,832
NPS PHARM		CS	62936P103	516,000		NPSP	16,099
NTL INC			FS	629407107	1,095,000	NLI	3,395
ORION POWER		CS	686286105	580,000		ORN	14,790
ORTHOFIX INTL NV	FS	N6748L102	810,700		OFIX	23,105
OWENS & MINOR		CS	690732102	780,000		OMI	15,834
PARADIGM GEO		FS	69900J104	430,000		PGEO	1,711
PARKER DRILLING		CS	701081101	1,440,000	PKD	4,435
PEMSTAR INC		CS	706552106	670,500		PMTR	7,711
PEOPLES BANK BRIDGEP	CS	710198102	1,391,200	PBCT	30,885
PERLEGEN SCIENCES	PS	714999992	1,249,999	PERLEGEN 4,500
PHILADELPHIA CONS	CS	717528103	875,100		PHLY	30,401
PIER ONE IMPORTS	CS	720279108	1,330,000	PIR	11,039
PINNACLE ENTERTAIN	CS	723456109	790,000		PNK	4,701
PINNACLE HOLDINGS	CS	72346N101	410,000		BIGT	160
PIONEER STANDARD ELE	CS	723877106	985,000		PIOS	8,885
POMEROY COMPUTER	CS	731822102	875,300		PMRY	10,547
PRIMEDIA INC		CS	74157K101	2,276,500	PRM	5,350
PROQUEST CO		CS	74346P102	240,000		PQE	7,896
PROTECTIVE LIFE		CS	743674103	995,000		PL	28,855
PROTEIN DESIGN LABS	CS	74369L103	132,000		PDLI	6,234
RAINBOW TECH		CS	750862104	200,000		RNBO	700
RCM TECHOLOGIES		CS	749360400	1,969,000	RCMT	7,581
REPUBLIC BANCORP	CS	760282103	784,900		RBNC	11,232
RIVERDEEP		CS	76870Q109	40,000		RVDP	585
RLI CORP		CS	749607107	360,000		RLI	14,760
ROUSE CO		CS	779273101	1,104,000	RSE	26,684
ROYAL OLYMPIC CRUISE	CS	V7780Z109	391,000		ROCLF	704
RSA SECURITY INC	CS	749719100	180,000		RSAS	2,423
SALEM COMMUNICATIONS	CS	794093104	1,809,000	SALM	35,276
SEACHANGE INTL		CS	811699107	480,000		SEAC	8,386
SECURITY CAPITAL EUR	CS	99HWQS906	1,062,498	SCGLOBAL 19,125
SEI INVESTMENTS CO	CS	784117103	3,026,000	SEIC	96,832
SENSABLE SERIES C PF	PS	817252984	301,205		SENSABLE 1,000
SEROLOGICALS CORPORA	CS	817523103	1,853,900	SERO	33,574
SHUFFLE MASTER INC	CS	825549108	1,160,000	SHFL	14,628
SIDERCA  ADR		FS	825863103	480,400		SDT	6,346
SIGMA			FS	720673SDL	213,875		SIGMA	2,994
SIX FLAGS INC.		CS	83001P109	480,000		PKS	5,870
SKECHERS USA		CS	830566105	785,000		SKX	9,169
SL GREEN REALTY		CS	78440X101	1,041,000	SLG	32,812
SOLECTRON CORP		CS	834182107	350,000		SLR	4,078
SPARTECH		CS	847220209	1,316,000	SEH	27,215
SPSS INC		CS	78462K102	200,000		SPSS	3,442
STANCORP FINANCIAL	CS	852891100	300,000		SFG	14,520
STARTEC GLOBAL COMM	CS	85569E103	498,000		STGC	95
STATION CASINOS		CS	857689103	2,888,550	STN	24,264
STEINER LEISURE		CS	P8744Y102	1,206,400	STNR	19,302
STERIS CORP		CS	859152100	1,470,500	STE	28,910
STEVEN MADDEN		CS	556269108	1,081,200	SHOO	10,974
STONE ENERGY CORP	CS	861642106	200,000		SGY	6,440
STRATEGIC HOTEL BOND	CV	68599Q9A6	2,500,000	STRAT.B	2,500
STRATEGIC HOTEL CAP	CS	862723103	208,333		STRAT.C	1,669
SUMMIT PROPERTIES	CS	866239106	540,000		SMT	14,175
SYMYX TECHNOLOGIES	CS	87155S108	347,000		SMMX	5,118
SYNCOR			CS	87157J106	792,000		SCOR	25,209
SYRRX INC SER C PFD	PS	87299N981	769,231		SYRRX	5,000
SYSTEMS AND COMPUTER	CS	871873105	2,130,000	SCTC	19,170
TCF FINANCIAL CORP	CS	872275102	1,233,000	TCB	56,792
TECHNE CORPORATION	CS	878377100	101,000		TECH	2,972
TEKTRONIX		CS	879131100	402,000		TEK	7,031
TELEPHONE AND DATA S	CS	879433100	713,000		TDS	67,236
TESORO PETROLEUM COR	CS	881609101	3,055,700	TSO	36,363
TETRA TECH INC		CS	88162G103	380,000		TTEK	8,398
TEXAS REGIONAL BANKS	CS	882673106	909,750		TRBS	31,086
THQ INQ			CS	872443403	825,000		THQI	35,599
TIDEL TECH		CS	886368109	940,000		ATMS	658
TIDEL TECHNOLOGIES 6	CV	8863689A9	3,000,000	TIDEL6%	900
TIPPERARY CORP		CS	888002300	1,200,000	TPY	1,920
ULTRA PETROLEUM		CS	903914109	1,062,200	UPL	4,249
UMPQUA CORP		CS	904214103	48,500		UMPQ	599
UNISOURCE		CS	909205106	1,411,400	UNS	19,760
UNITED MICROELEC ADR	FS	910873207	206,595		UMC	1,099
USX US STEEL CO		CS	90337T101	250,000		X	3,495
VAIL RESORTS INC.	CS	91879Q109	1,010,000	MTN	14,039
VARIAN INC.		CS	922206107	281,300		VARI	7,168
VISX INC		CS	92844S105	1,206,000	EYE	15,955
VITALSTREAM		PC	927993998	225,461		VITALSTR 1,578
WACKENHUT CORP CL B	CS	929794303	2,623,400	WAK.B	48,533
WATERS CORP		CS	941848103	92,000		WAT	3,291
WHOLE FOODS		CS	966837106	951,000		WFMI	29,871
WORLD ACCEPTANCE COR	CS	981419104	3,036,200	WRLD	21,253
XTO ENERGY INC		CS	98385X106	6,697,000	XTO	93,423
YOUNG BROADCASTING A	CS	987434107	400,000		YBTVA	5,800
ZALE CORP		CS	988858106	599,000		ZLC	15,862
ZEBRA TECH		CS	989207105	154,400		ZBRA	5,784
ZENITH NATIONAL INSU	CS	989390109	2,380		ZNT	59

									4,686,948