3M CO COM COM 88579Y101 1368 6232 SH SOLE 6232 0 0 ACCENTURE PLC IRELAND SHS CLAS COM G1151C101 955 6221 SH SOLE 6221 0 0 ALPHABET INC CAP STK CL A COM 02079K305 2300 2218 SH SOLE 2218 0 0 ALPHABET INC CAP STK CL C COM 02079K107 629 610 SH SOLE 610 0 0 ALTRIA GROUP INC COM COM 02209S103 287 4600 SH SOLE 4600 0 0 AMAZON COM INC COM COM 023135106 1708 1180 SH SOLE 1180 0 0 AMERICAN EXPRESS CO COM COM 025816109 1112 11922 SH SOLE 11922 0 0 AMETEK INC NEW COM COM 031100100 25061 329885 SH SOLE 329885 0 0 AMPHENOL CORP NEW CL A COM 032095101 5137 59638 SH SOLE 59638 0 0 ANGIODYNAMICS INC COM COM 03475V101 213 12325 SH SOLE 12325 0 0 ANHEUSER BUSCH INBEV SA/NV SPO COM 03524A108 13824 125738 SH SOLE 125738 0 0 APPLE INC COM COM 037833100 6742 40186 SH SOLE 40186 0 0 ARCH CAP GROUP LTD ORD COM G0450A105 14121 164985 SH SOLE 164985 0 0 AUTOZONE INC COM COM 053332102 8395 12941 SH SOLE 12941 0 0 BANK AMER CORP COM COM 060505104 1643 54800 SH SOLE 54800 0 0 BANK NEW YORK MELLON CORP COM COM 064058100 421 8173 SH SOLE 8173 0 0 BECTON DICKINSON & CO COM COM 075887109 310 1431 SH SOLE 1431 0 0 BERKSHIRE HATHAWAY CLASS B COM 084670702 11276 56527 SH SOLE 56527 0 0 BLACKROCK INC COM COM 09247X101 1476 2725 SH SOLE 2725 0 0 BROWN FORMAN CORP CL B COM 115637209 330 6075 SH SOLE 6075 0 0 CAE INC COM COM 124765108 949 51055 SH SOLE 51055 0 0 CANADIAN PAC RY LTD COM COM 13645T100 16738 94835 SH SOLE 94835 0 0 CASEYS GEN STORES INC COM COM 147528103 5893 53685 SH SOLE 53685 0 0 CASS INFORMATION SYS INC COM COM 14808P109 206 3459 SH SOLE 3459 0 0 CHUBB LIMITED COM COM H1467J104 530 3872 SH SOLE 3872 0 0 CITIGROUP INC COM NEW COM 172967424 238 3525 SH SOLE 3525 0 0 COLGATE PALMOLIVE CO COM COM 194162103 7115 99265 SH SOLE 99265 0 0 COMCAST CORP NEW CL A COM 20030N101 1438 42071 SH SOLE 42071 0 0 COPART INC COM COM 217204106 8011 157302 SH SOLE 157302 0 0 CSW INDUSTRIALS INC COM COM 126402106 351 7800 SH SOLE 7800 0 0 DIAGEO P L C SPON ADR NEW COM 25243Q205 841 6207 SH SOLE 6207 0 0 DIAMOND HILL INVESTMENT GROUP COM 25264R207 219 1058 SH SOLE 1058 0 0 DORMAN PRODUCTS INC COM COM 258278100 11559 174575 SH SOLE 174575 0 0 DUKE ENERGY CORP NEW COM NEW COM 26441C204 214 2763 SH SOLE 2763 0 0 EATON CORP PLC SHS COM G29183103 365 4572 SH SOLE 4572 0 0 ENSTAR GROUP LIMITED SHS COM G3075P101 1013 4820 SH SOLE 4820 0 0 EQUITY COMWLTH COM SH BEN INT COM 294628102 3020 98470 SH SOLE 98470 0 0 EXXON MOBIL CORP COM COM 30231G102 362 4853 SH SOLE 4853 0 0 FACEBOOK INC CL A COM 30303M102 481 3012 SH SOLE 3012 0 0 FEDEX CORP COM COM 31428X106 418 1740 SH SOLE 1740 0 0 FIDELITY NATL INFORMATION SVCS COM 31620M106 2831 29401 SH SOLE 29401 0 0 GENERAL DYNAMICS CORP COM COM 369550108 218 989 SH SOLE 989 0 0 GOLDMAN SACHS GROUP INC COM COM 38141G104 607 2411 SH SOLE 2411 0 0 GRACO INC COM COM 384109104 7419 162280 SH SOLE 162280 0 0 HEICO CORP NEW CL A COM 422806208 35825 504936 SH SOLE 504936 0 0 HEXCEL CORP NEW COM COM 428291108 20634 319455 SH SOLE 319455 0 0 HINGHAM INSTN SVGS MASS COM COM 433323102 9921 48159 SH SOLE 48159 0 0 HOME DEPOT INC COM COM 437076102 340 1910 SH SOLE 1910 0 0 HOWARD HUGHES CORP COM COM 44267D107 1621 11650 SH SOLE 11650 0 0 IDEX CORP COM COM 45167R104 11446 80316 SH SOLE 80316 0 0 ILLINOIS TOOL WKS INC COM COM 452308109 805 5142 SH SOLE 5142 0 0 INGREDION INC COM COM 457187102 6645 51545 SH SOLE 51545 0 0 INTEL CORP COM COM 458140100 2327 44678 SH SOLE 44678 0 0 INTERCONTINENTAL EXCHANGE INC COM 45866F104 16279 224470 SH SOLE 224470 0 0 INTERNATIONAL BUSINESS MACHS C COM 459200101 743 4840 SH SOLE 4840 0 0 INTREPID POTASH INC COM COM 46121Y102 91 25000 SH SOLE 25000 0 0 ISHARES GOLD TRUST ISHARES COM 464285105 544 42700 SH SOLE 42700 0 0 JOHNSON & JOHNSON COM COM 478160104 2488 19418 SH SOLE 19418 0 0 JONES LANG LASALLE INC COM COM 48020Q107 795 4550 SH SOLE 4550 0 0 JPMORGAN CHASE & CO COM COM 46625H100 7074 64326 SH SOLE 64326 0 0 KAR AUCTION SVCS INC COM COM 48238T109 17292 319040 SH SOLE 319040 0 0 LEGACY TEX FINL GROUP INC COM COM 52471Y106 17880 417573 SH SOLE 417573 0 0 M & T BK CORP COM COM 55261F104 10857 58890 SH SOLE 58890 0 0 MARTIN MARIETTA MATLS INC COM COM 573284106 422 2035 SH SOLE 2035 0 0 MASTERCARD INCORPORATED CL A COM 57636Q104 10686 61005 SH SOLE 61005 0 0 MCDONALDS CORP COM COM 580135101 327 2088 SH SOLE 2088 0 0 MEDTRONIC PLC SHS COM G5960L103 210 2620 SH SOLE 2620 0 0 MICROSOFT CORP COM COM 594918104 4973 54482 SH SOLE 54482 0 0 MONDELEZ INTL INC CL A COM 609207105 355 8500 SH SOLE 8500 0 0 NEWMARKET CORP COM COM 651587107 6565 16345 SH SOLE 16345 0 0 NIKE INC CL B COM 654106103 294 4428 SH SOLE 4428 0 0 NORTHERN TR CORP COM COM 665859104 543 5270 SH SOLE 5270 0 0 NRG YIELD INC CL A NEW COM 62942X306 454 27600 SH SOLE 27600 0 0 NRG YIELD INC CL C COM 62942X405 527 31000 SH SOLE 31000 0 0 O REILLY AUTOMOTIVE INC NEW CO COM 67103H107 9858 39850 SH SOLE 39850 0 0 ORACLE CORP COM COM 68389X105 230 5033 SH SOLE 5033 0 0 PAYPAL HLDGS INC COM COM 70450Y103 2111 27826 SH SOLE 27826 0 0 PEPSICO INC COM COM 713448108 922 8446 SH SOLE 8446 0 0 PHILIP MORRIS INTL INC COM COM 718172109 405 4079 SH SOLE 4079 0 0 PRAXAIR INC COM COM 74005P104 17060 118225 SH SOLE 118225 0 0 PROCTER AND GAMBLE CO COM COM 742718109 715 9021 SH SOLE 9021 0 0 RBC BEARINGS INC COM COM 75524B104 15644 125959 SH SOLE 125959 0 0 RLI CORP COM COM 749607107 20502 323419 SH SOLE 323419 0 0 ROPER TECHNOLOGIES INC COM COM 776696106 12302 43829 SH SOLE 43829 0 0 SCHEIN HENRY INC COM COM 806407102 13967 207805 SH SOLE 207805 0 0 SEMGROUP CORP CL A COM 81663A105 7653 357601 SH SOLE 357601 0 0 STARBUCKS CORP COM COM 855244109 1288 22241 SH SOLE 22241 0 0 TARGA RES CORP COM COM 87612G101 8974 203959 SH SOLE 203959 0 0 TD AMERITRADE HLDG CORP COM COM 87236Y108 966 16306 SH SOLE 16306 0 0 TE CONNECTIVITY LTD REG SHS COM H84989104 2981 29836 SH SOLE 29836 0 0 TELEDYNE TECHNOLOGIES INC COM COM 879360105 14439 77145 SH SOLE 77145 0 0 TEXAS INSTRS INC COM COM 882508104 2725 26230 SH SOLE 26230 0 0 TEXAS PAC LD TR SUB CTF PROP I COM 882610108 394 780 SH SOLE 780 0 0 TRANSDIGM GROUP INC COM COM 893641100 9606 31295 SH SOLE 31295 0 0 TWITTER INC COM COM 90184L102 377 13002 SH SOLE 13002 0 0 UNILEVER PLC SPON ADR NEW COM 904767704 531 9562 SH SOLE 9562 0 0 UNITED TECHNOLOGIES CORP COM COM 913017109 774 6155 SH SOLE 6155 0 0 UNITEDHEALTH GROUP INC COM COM 91324P102 1873 8752 SH SOLE 8752 0 0 US BANCORP DEL COM NEW COM 902973304 280 5547 SH SOLE 5547 0 0 VANGUARD SCOTTSDALE FDS SHRT T COM 92206C409 217 2762 SH SOLE 2762 0 0 VERISIGN INC COM COM 92343E102 6351 53570 SH SOLE 53570 0 0 VERISK ANALYTICS INC COM COM 92345Y106 312 3000 SH SOLE 3000 0 0 VERSUM MATLS INC COM COM 92532W103 4762 126535 SH SOLE 126535 0 0 VISA INC COM CL A COM 92826C839 8904 74435 SH SOLE 74435 0 0 WATERS CORP COM COM 941848103 278 1400 SH SOLE 1400 0 0 WELLS FARGO CO NEW COM COM 949746101 1597 30477 SH SOLE 30477 0 0 WHITE MTNS INS GROUP LTD COM COM G9618E107 6934 8430 SH SOLE 8430 0 0 WILLIAMS COS INC DEL COM COM 969457100 2167 87166 SH SOLE 87166 0 0 WINMARK CORP COM COM 974250102 2304 17615 SH SOLE 17615 0 0 DBX ETF TR XTRACK MSCI EURP XTRACK MSCI EURP 233051853 524 19080 SH SOLE 19080 0 0 ISHARES INC MSCI PAC JP ETF MSCI PAC JP ETF 464286665 443 9545 SH SOLE 9545 0 0 ISHARES TR CORE S&P SCP ETF CORE S&P SCP ETF 464287804 1727 22428 SH SOLE 22428 0 0 ISHARES TR MSCI ACWI ETF MSCI ACWI ETF 464288257 215 3000 SH SOLE 3000 0 0 ISHARES TR RUS 1000 VAL ETF RUS 1000 VAL ETF 464287598 329 2741 SH SOLE 2741 0 0 ISHARES TR RUS MDCP VAL ETF RUS MDCP VAL ETF 464287473 9437 109182 SH SOLE 109182 0 0 ISHARES TR SELECT DIVID ETF SELECT DIVID ETF 464287168 16549 173980 SH SOLE 173980 0 0 RYDEX ETF TRUST GUG S&P500 EQ WT 78355W106 17455 175459 SH SOLE 175459 0 0 SCHWAB STRATEGIC TR INTL EQTY INTL EQTY ETF 808524805 1851 54900 SH SOLE 54900 0 0 SPDR S&P 500 ETF TR TR UNIT 78462F103 10890 41384 SH SOLE 41384 0 0 VANGUARD TAX MANAGED INTL FD FTSE DEV MKT ETF 921943858 673 15203 SH SOLE 15203 0 0 VANGUARD WHITEHALL FDS INC HIGH DIV YLD 921946406 1105 13400 SH SOLE 13400 0 0 VANGUARD INDEX FDS TOTAL STK MKT 922908769 500 3685 SH SOLE 3685 0 0