The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F INFORMATION TABLE
OMB APPROVAL
OMB Number: 3235-0006
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COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8
VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY
NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DISCRETION MANAGER SOLE SHARED NONE
2U Inc. COM 90214J101 133,770 1,888,080 SH   SOLE   1,857,145 0 30,935
AAC Holdings Inc. COM 000307108 3,400 1,847,900 SH   SOLE   1,847,900 0 0
Acceleron Pharma Inc COM 00434H108 42,878 920,715 SH   SOLE   903,915 0 16,800
ACI Worldwide Inc. COM 004498101 51,118 1,555,160 SH   SOLE   1,522,360 0 32,800
Addus Home Care Corp COM 006739106 56,133 882,730 SH   SOLE   882,730 0 0
Adobe Inc. COM 00724F101 6,721 25,220 SH   SOLE   24,120 0 1,100
Aercap Holdings NV SHS N00985106 61,450 1,320,375 SH   SOLE   1,026,275 0 294,100
Agilent Technologies Inc COM 00846U101 80,999 1,007,700 SH   SOLE   723,250 0 284,450
Albany International Corp CL A 012348108 77,502 1,082,575 SH   SOLE   1,082,575 0 0
Alphabet Inc Class C CAP STK CL C 02079K107 14,167 12,074 SH   SOLE   11,537 0 537
Altice USA Inc CL A 02156K103 77,816 3,622,700 SH   SOLE   2,597,075 0 1,025,625
Amazon.com Inc. COM 023135106 15,916 8,938 SH   SOLE   8,550 0 388
Amdocs Limited SHS G02602103 86,224 1,593,500 SH   SOLE   1,168,950 0 424,550
American Renal Associates COM 029227105 5,866 955,431 SH   SOLE   955,431 0 0
AMERISAFE Inc. COM 03071H100 21,079 354,862 SH   SOLE   354,862 0 0
Ametek Inc COM 031100100 88,585 1,067,670 SH   SOLE   791,765 0 275,905
Amphenol Corp. Cl A CL A 032095101 69,395 734,800 SH   SOLE   527,575 0 207,225
Apergy Corporation COM 03755L104 19,315 470,400 SH   SOLE   470,400 0 0
Apollo Global Management CL A SHS 037612306 117,870 4,172,375 SH   SOLE   3,303,575 0 868,800
Apple Inc COM 037833100 4,415 23,245 SH   SOLE   22,225 0 1,020
AptarGroup Inc. COM 038336103 15,693 147,500 SH   SOLE   140,200 0 7,300
APTIV Plc SHS G6095L109 55,571 699,100 SH   SOLE   501,950 0 197,150
Argenx SE ADR SPONSORED ADR 04016X101 15,375 123,155 SH   SOLE   123,155 0 0
Argo Group International COM G0464B107 31,691 448,500 SH   SOLE   448,500 0 0
ASGN Incorporated COM 00191U102 97,816 1,540,655 SH   SOLE   1,535,595 0 5,060
Assured Guaranty Ltd COM G0585R106 64,161 1,444,100 SH   SOLE   1,036,400 0 407,700
Atlassian Corporation Plc CL A G06242104 46,754 416,000 SH   SOLE   298,675 0 117,325
Avalara Inc COM 05338G106 101,595 1,821,025 SH   SOLE   1,439,365 0 381,660
Beacon Roofing Supply Inc COM 073685109 98,126 3,051,176 SH   SOLE   2,997,446 0 53,730
BJs Wholesale Club Holdin COM 05550J101 83,230 3,037,590 SH   SOLE   2,983,590 0 54,000
BlackLine Inc COM 09239B109 43,351 935,910 SH   SOLE   935,910 0 0
Blueprint Medicines Corp. COM 09627Y109 68,412 854,620 SH   SOLE   839,920 0 14,700
Booz Allen & Hamilton Inc CL A 099502106 204,967 3,525,400 SH   SOLE   2,712,900 0 812,500
Bottomline Technologies I COM 101388106 56,936 1,136,680 SH   SOLE   1,136,680 0 0
Bright Horizons Family So COM 109194100 79,554 625,870 SH   SOLE   600,165 0 25,705
Broadridge Financial Solu COM 11133T103 48,226 465,100 SH   SOLE   447,100 0 18,000
Brooks Automation Inc. COM 114340102 37,997 1,295,500 SH   SOLE   1,295,500 0 0
Brunswick Corp. COM 117043109 98,317 1,953,440 SH   SOLE   1,538,265 0 415,175
Burlington Stores Inc COM 122017106 75,520 482,000 SH   SOLE   346,550 0 135,450
BWX Technologies Inc. COM 05605H100 142,983 2,883,875 SH   SOLE   2,282,480 0 601,395
Cable One Inc COM 12685J105 66,703 67,969 SH   SOLE   67,169 0 800
Cabot Microelectronics Co COM 12709P103 34,697 309,903 SH   SOLE   309,903 0 0
Cactus Inc Cl A CL A 127203107 38,444 1,079,895 SH   SOLE   1,061,395 0 18,500
Cadence BanCorporation CL A 12739A100 43,842 2,363,450 SH   SOLE   2,363,450 0 0
Callaway Golf Co. COM 131193104 37,876 2,377,630 SH   SOLE   2,377,630 0 0
Casella Waste Systems Inc CL A 147448104 27,427 771,300 SH   SOLE   771,300 0 0
CBRE Group Inc CL A 12504L109 164,560 3,327,800 SH   SOLE   2,345,550 0 982,250
Centene Corp. COM 15135B101 62,426 1,175,625 SH   SOLE   844,525 0 331,100
Charles River Laboratorie COM 159864107 125,434 863,575 SH   SOLE   687,625 0 175,950
Chegg Inc COM 163092109 59,552 1,562,220 SH   SOLE   1,542,720 0 19,500
Chemed Corp. COM 16359R103 54,316 169,700 SH   SOLE   123,650 0 46,050
Cintas Corp. COM 172908105 77,368 382,800 SH   SOLE   275,175 0 107,625
Circor International Inc. COM 17273K109 31,510 966,570 SH   SOLE   966,570 0 0
Cision Ltd. SHS G1992S109 62,310 4,525,035 SH   SOLE   4,478,035 0 47,000
Clean Harbors Inc COM 184496107 121,321 1,696,082 SH   SOLE   1,671,582 0 24,500
Cogent Communications Gro COM NEW 19239V302 38,060 701,570 SH   SOLE   701,570 0 0
Cognex Corp. COM 192422103 15,833 311,300 SH   SOLE   298,300 0 13,000
Comcast Corp. Cl A CL A 20030N101 7,478 187,035 SH   SOLE   178,895 0 8,140
Concho Resources Inc COM 20605P101 78,593 708,300 SH   SOLE   509,100 0 199,200
Copart Inc. COM 217204106 74,235 1,225,200 SH   SOLE   880,350 0 344,850
Corporacion America Airpo COM L1995B107 83 10,000 SH   SOLE   0 0 10,000
Costar Group Inc COM 22160N109 185,805 398,365 SH   SOLE   322,340 0 76,025
Coupa Software Incorporat COM 22266L106 82,228 903,800 SH   SOLE   787,475 0 116,325
Covetrus Inc COM 22304C100 11,077 347,800 SH   SOLE   331,200 0 16,600
Cushman & Wakefield PLC SHS G2717B108 38,649 2,171,300 SH   SOLE   2,091,300 0 80,000
Davita Inc COM 23918K108 91,967 1,694,000 SH   SOLE   1,226,200 0 467,800
DexCom Inc. COM 252131107 28,798 241,800 SH   SOLE   173,000 0 68,800
Dolby Laboratories Inc. C COM CL A 25659T107 83,045 1,318,800 SH   SOLE   947,325 0 371,475
Domino's Pizza Inc. COM 25754A201 93,506 362,285 SH   SOLE   267,070 0 95,215
Elanco Animal Health Inco COM 28414H103 66,735 2,080,930 SH   SOLE   1,557,685 0 523,245
Elastic NV ORD SHS N14506104 18,474 231,300 SH   SOLE   181,575 0 49,725
EMCOR Group Inc COM 29084Q100 100,552 1,375,910 SH   SOLE   1,353,910 0 22,000
Encompass Health Corporat COM 29261A100 55,992 958,772 SH   SOLE   922,772 0 36,000
Entegris Inc. COM 29362U104 115,364 3,232,400 SH   SOLE   2,521,325 0 711,075
Envestnet Inc. COM 29404K106 30,983 473,825 SH   SOLE   473,825 0 0
ETSY Inc COM 29786A106 12,059 179,400 SH   SOLE   170,661 0 8,739
Evo Payments Inc Class A CL A COM 26927E104 62,750 2,160,070 SH   SOLE   2,137,570 0 22,500
Exela Technologies Inc COM 30162V102 9,740 2,916,294 SH   SOLE   2,916,294 0 0
Exlservice Holdings Inc COM 302081104 58,870 980,836 SH   SOLE   980,836 0 0
Exponent Inc. COM 30214U102 44,476 770,545 SH   SOLE   770,545 0 0
Facebook Inc CL A 30303M102 8,380 50,275 SH   SOLE   48,080 0 2,195
Fleetcor Technologies Inc COM 339041105 134,499 545,435 SH   SOLE   405,885 0 139,550
Floor & Decor Holdings In CL A 339750101 50,221 1,218,355 SH   SOLE   1,198,355 0 20,000
Focus Financial Partners COM CL A 34417P100 44,942 1,261,000 SH   SOLE   1,261,000 0 0
Gartner Inc COM 366651107 163,974 1,081,050 SH   SOLE   829,000 0 252,050
Global Payments Inc COM 37940X102 289,885 2,123,390 SH   SOLE   1,527,595 0 595,795
Grand Canyon Education In COM 38526M106 43,633 381,045 SH   SOLE   365,940 0 15,105
Green Dot Corp Class A CL A 39304D102 18,215 300,330 SH   SOLE   300,330 0 0
Grubhub Inc COM 400110102 53,426 769,050 SH   SOLE   604,550 0 164,500
Guidewire Software Inc COM 40171V100 18,266 188,000 SH   SOLE   178,500 0 9,500
Hamilton Lane Inc Class A CL A 407497106 75,205 1,725,685 SH   SOLE   1,697,185 0 28,500
Health Insurance Innovati COM CL A 42225K106 37,158 1,385,445 SH   SOLE   1,364,445 0 21,000
Healthcare Services Group COM 421906108 48,226 1,461,830 SH   SOLE   1,461,830 0 0
Healthequity Inc COM 42226A107 22,416 303,000 SH   SOLE   288,000 0 15,000
Henry Schein Inc. COM 806407102 45,882 763,300 SH   SOLE   548,400 0 214,900
Hexcel Corp. COM 428291108 92,529 1,337,900 SH   SOLE   1,014,575 0 323,325
Hilton Grand Vacations In COM 43283X105 64,193 2,080,797 SH   SOLE   2,042,797 0 38,000
Home Depot Inc. COM 437076102 7,024 36,605 SH   SOLE   34,995 0 1,610
Houlihan Lokey Inc CL A 441593100 18,187 396,668 SH   SOLE   396,668 0 0
Hudson Ltd CL A COM CL A G46408103 38,647 2,810,700 SH   SOLE   2,810,700 0 0
IAC/InterActiveCorp. COM 44919P508 68,118 324,200 SH   SOLE   232,975 0 91,225
ICF International Inc. COM 44925C103 18,023 236,900 SH   SOLE   236,900 0 0
IHS Markit Ltd. SHS G47567105 52,411 963,800 SH   SOLE   691,125 0 272,675
Imax Corporation COM 45245E109 47,442 2,091,791 SH   SOLE   2,071,791 0 20,000
Immunomedics Inc. COM 452907108 44,379 2,310,200 SH   SOLE   2,271,200 0 39,000
Innovative Industrial Pro COM 45781V101 12,196 149,300 SH   SOLE   149,300 0 0
Inspire Medical Systems I COM 457730109 20,609 362,965 SH   SOLE   362,965 0 0
Instructure Inc COM 45781U103 67,386 1,430,085 SH   SOLE   1,430,085 0 0
Integer Holdings Corp COM 45826H109 52,820 700,350 SH   SOLE   687,050 0 13,300
Intercontinental Exchange COM 45866F104 6,122 80,410 SH   SOLE   76,895 0 3,515
International Flavors & F COM 459506101 93,192 723,600 SH   SOLE   528,200 0 195,400
International Game Techno SHS USD G4863A108 28,332 2,181,100 SH   SOLE   1,670,800 0 510,300
Intuit Inc. COM 461202103 8,489 32,475 SH   SOLE   31,050 0 1,425
iRhythm Technologies Inc COM 450056106 29,798 397,525 SH   SOLE   397,525 0 0
iShares MSCI India ETF MSCI INDIA ETF 46429B598 14 400 SH   SOLE   400 0 0
ITT Inc COM 45073V108 22,318 384,800 SH   SOLE   367,800 0 17,000
J2 Global Inc. COM 48123V102 111,888 1,292,008 SH   SOLE   1,272,208 0 19,800
Jack Henry and Associates COM 426281101 63,238 455,800 SH   SOLE   437,800 0 18,000
Kennedy-Wilson Holdings I COM 489398107 66,549 3,111,233 SH   SOLE   3,111,233 0 0
Knight Transportation Inc CL A 499049104 73,395 2,245,884 SH   SOLE   1,778,184 0 467,700
L3 Technologies Inc COM 502413107 67,008 324,700 SH   SOLE   233,575 0 91,125
Lam Research Corp. COM 512807108 60,613 338,600 SH   SOLE   243,300 0 95,300
Lamb Weston Holdings Inc COM 513272104 75,667 1,009,700 SH   SOLE   725,600 0 284,100
LHC Group COM 50187A107 93,372 842,252 SH   SOLE   828,152 0 14,100
Littelfuse Inc. COM 537008104 61,233 335,560 SH   SOLE   329,560 0 6,000
Martin Marietta Materials COM 573284106 95,098 472,700 SH   SOLE   339,600 0 133,100
Marvell Technology Group ORD G5876H105 124,223 6,245,498 SH   SOLE   4,844,448 0 1,401,050
Matador Resources Company COM 576485205 46,584 2,409,955 SH   SOLE   2,366,255 0 43,700
MGP Ingredients Inc. COM 55303J106 34,099 441,985 SH   SOLE   441,985 0 0
Microchip Technology Inc. COM 595017104 44,915 541,400 SH   SOLE   388,700 0 152,700
Microsoft Corp. COM 594918104 18,809 159,480 SH   SOLE   152,485 0 6,995
Mirati Therapeutics Inc. COM 60468T105 17,687 241,300 SH   SOLE   236,800 0 4,500
MKS Instruments Inc. COM 55306N104 95,728 1,028,780 SH   SOLE   1,011,780 0 17,000
Monolithic Power Systems COM 609839105 81,545 601,850 SH   SOLE   466,075 0 135,775
Monro Inc. COM 610236101 60,923 704,149 SH   SOLE   697,649 0 6,500
MorphoSys AG ADR SPONSORED ADS 617760202 16,324 718,500 SH   SOLE   685,700 0 32,800
National Storage Affiliat COM SHS BEN IN 637870106 21,799 764,595 SH   SOLE   764,595 0 0
National Vision Holdings COM 63845R107 96,935 3,084,140 SH   SOLE   3,037,640 0 46,500
Netflix Inc. COM 64110L106 5,805 16,280 SH   SOLE   15,575 0 705
New Relic Inc COM 64829B100 19,049 193,000 SH   SOLE   193,000 0 0
NICE Ltd SPONSORED ADR 653656108 22,866 186,650 SH   SOLE   178,350 0 8,300
NLight Inc COM 65487K100 41,000 1,840,205 SH   SOLE   1,840,205 0 0
Nordson Corporation COM 655663102 77,409 584,130 SH   SOLE   454,155 0 129,975
Novocure Ltd ORD SHS G6674U108 47,611 988,390 SH   SOLE   970,890 0 17,500
NVIDIA Corp. COM 67066G104 3,125 17,405 SH   SOLE   16,605 0 800
O'Reilly Automotive Inc COM 67103H107 135,478 348,900 SH   SOLE   255,275 0 93,625
Ollie s Bargain Outlet Ho COM 681116109 48,425 567,500 SH   SOLE   567,500 0 0
OneSpaWorld Holdings Limi COM P73684113 37,702 2,760,000 SH   SOLE   2,760,000 0 0
PacWest Bancorp. COM 695263103 13,549 360,257 SH   SOLE   345,857 0 14,400
PagSeguro Digital Ltd Cl COM CL A G68707101 16,280 545,400 SH   SOLE   518,400 0 27,000
Paylocity Holding Corp COM 70438V106 125,958 1,412,248 SH   SOLE   1,386,748 0 25,500
Paypal Inc COM 70450Y103 8,231 79,270 SH   SOLE   75,805 0 3,465
Pegasystems Inc. COM 705573103 45,563 700,975 SH   SOLE   700,975 0 0
Performance Foods Group C COM 71377A103 29,106 734,250 SH   SOLE   701,750 0 32,500
Petiq Inc COM CL A 71639T106 39,950 1,271,900 SH   SOLE   1,248,400 0 23,500
Pivotal Software Inc CLA COM CL A 72582H107 64,158 3,077,100 SH   SOLE   2,349,300 0 727,800
Planet Fitness Inc Cla CL A 72703H101 29,481 429,000 SH   SOLE   412,500 0 16,500
PluralSight Inc Cl A COM CL A 72941B106 129,137 4,068,600 SH   SOLE   4,008,400 0 60,200
Pool Corporation COM 73278L105 63,022 382,020 SH   SOLE   276,770 0 105,250
Priority Technology Holdi COM 74275G107 14,942 2,253,710 SH   SOLE   2,253,710 0 0
Proassurance Corporation COM 74267C106 28,245 816,105 SH   SOLE   816,105 0 0
Progressive Corp. COM 743315103 257,091 3,566,255 SH   SOLE   2,548,685 0 1,017,570
Proto Labs Inc COM 743713109 13,710 130,400 SH   SOLE   122,900 0 7,500
PTC Inc COM 69370C100 61,549 667,700 SH   SOLE   480,100 0 187,600
Q2 Holdings Inc COM 74736L109 119,315 1,722,707 SH   SOLE   1,701,207 0 21,500
RBC Bearings Inc COM 75524B104 34,530 271,524 SH   SOLE   271,524 0 0
RealPage Inc COM 75606N109 91,245 1,503,458 SH   SOLE   1,503,458 0 0
Renaissancere Holdings Lt COM G7496G103 144,110 1,004,248 SH   SOLE   789,798 0 214,450
Rexnord Holdings Inc COM 76169B102 48,952 1,947,167 SH   SOLE   1,947,167 0 0
Rhythm Pharmaceuticals In COM 76243J105 20,285 740,050 SH   SOLE   740,050 0 0
Rosetta Stone Inc. COM 777780107 36,826 1,685,405 SH   SOLE   1,685,405 0 0
RPM International Inc COM 749685103 22,508 387,797 SH   SOLE   368,097 0 19,700
Ryanair Holdings plc - SP SPONSORED ADS 783513203 74,977 1,000,500 SH   SOLE   718,550 0 281,950
SAGE Therapeutics Inc. COM 78667J108 78,762 495,200 SH   SOLE   388,200 0 107,000
SailPoint Technologies Ho COM 78781P105 26,396 919,085 SH   SOLE   902,085 0 17,000
Sarepta Therapeutics Inc COM 803607100 130,624 1,095,935 SH   SOLE   867,825 0 228,110
SBA Communications Corp CL A 78410G104 148,234 742,430 SH   SOLE   533,725 0 208,705
Select Medical Holdings C COM 81619Q105 25,275 1,793,800 SH   SOLE   1,704,300 0 89,500
Shenandoah Telecommunicat COM 82312B106 30,473 686,940 SH   SOLE   686,940 0 0
Smartsheet Inc Class A COM CL A 83200N103 22,129 542,500 SH   SOLE   542,500 0 0
Solaris Oilfield Infrastr COM CL A 83418M103 19,740 1,200,720 SH   SOLE   1,200,720 0 0
StoneCo Ltd COM CL A G85158106 1,575 38,300 SH   SOLE   38,300 0 0
Strategic Ed Inc COM 86272C103 128,659 979,810 SH   SOLE   969,510 0 10,300
Summit Materials Inc CL A 86614U100 42,009 2,647,081 SH   SOLE   2,594,066 0 53,015
SVB Financial Group COM 78486Q101 141,888 638,100 SH   SOLE   447,775 0 190,325
Tableau Software Inc. Cla CL A 87336U105 59,363 466,400 SH   SOLE   334,875 0 131,525
Talend SA ADR ADS 874224207 30,069 594,600 SH   SOLE   594,600 0 0
Tandem Diabetes Care Inc. COM NEW 875372203 79,090 1,245,515 SH   SOLE   1,221,830 0 23,685
TD Ameritrade Holding Cor COM 87236Y108 42,511 850,400 SH   SOLE   611,100 0 239,300
Total System Services Inc COM 891906109 75,067 790,100 SH   SOLE   567,550 0 222,550
Tractor Supply Company COM 892356106 63,192 646,400 SH   SOLE   464,350 0 182,050
Transdigm Group Inc COM 893641100 46,852 103,200 SH   SOLE   74,225 0 28,975
Transunion COM 89400J107 187,933 2,811,680 SH   SOLE   2,200,615 0 611,065
Trinet Group Inc COM 896288107 115,713 1,936,950 SH   SOLE   1,914,950 0 22,000
Tyler Technologies Inc. COM 902252105 121,312 593,503 SH   SOLE   493,328 0 100,175
Ulta Salon Cosmetics & Fr COM 90384S303 51,263 147,000 SH   SOLE   105,575 0 41,425
Under Armour Inc Class A CL A 904311107 17,071 807,500 SH   SOLE   767,500 0 40,000
USA Technologies Inc COM NO PAR 90328S500 7,603 1,832,165 SH   SOLE   1,832,165 0 0
VanEck Vectors India Smal INDIA SMALL CAP 92189F767 215 4,900 SH   SOLE   4,900 0 0
Verisk Analytics Inc. Cl COM 92345Y106 101,810 765,490 SH   SOLE   566,815 0 198,675
Vertex Pharmaceuticals In COM 92532F100 95,797 520,775 SH   SOLE   381,475 0 139,300
Viad Corp. COM NEW 92552R406 36,051 640,450 SH   SOLE   640,450 0 0
Visa Inc. COM CL A 92826C839 13,410 85,855 SH   SOLE   82,100 0 3,755
Wabco Holdings Inc COM 92927K102 58,335 442,500 SH   SOLE   350,850 0 91,650
WageWorks Inc COM 930427109 77,364 2,048,833 SH   SOLE   2,016,833 0 32,000
Waste Connections Inc. COM 94106B101 105,015 1,185,400 SH   SOLE   869,500 0 315,900
Wellcare Health Plans Inc COM 94946T106 142,671 528,900 SH   SOLE   372,550 0 156,350
Wex Inc COM 96208T104 106,988 557,257 SH   SOLE   478,482 0 78,775
Willdan Group Inc. COM 96924N100 26,754 721,710 SH   SOLE   721,710 0 0
Williams Scotsman Corp COM 971375126 25,661 2,313,900 SH   SOLE   2,313,900 0 0
Wintrust Financial Corp. COM 97650W108 23,855 354,300 SH   SOLE   336,300 0 18,000
WisdomTree Investments In COM 97717P104 48,362 6,850,108 SH   SOLE   6,738,108 0 112,000
WNS Holdings Ltd ADR SPON ADR 92932M101 80,754 1,515,940 SH   SOLE   1,478,440 0 37,500
Woodward Inc. COM 980745103 20,012 210,900 SH   SOLE   201,900 0 9,000
Xtrackers Harvest CSI 300 XTRACK HRVST CSI 233051879 69 2,400 SH   SOLE   0 0 2,400
Zendesk Inc. COM 98936J101 95,838 1,127,500 SH   SOLE   893,600 0 233,900
Zynga Inc CL A 98986T108 70,656 13,256,300 SH   SOLE   10,335,200 0 2,921,100