3m Co COM 88579Y101 1457 7012 SH SOLE NONE 0 0 7012 Abbott Labs COM 002824100 1818 22743 SH SOLE NONE 0 0 22743 Abbvie Inc COM 00287Y109 1283 15920 SH SOLE NONE 0 0 15920 Align Technology, Inc. COM 016255101 2846 10010 SH SOLE NONE 3830 0 6180 Alphabet Cl A CAP STK CL A 02079K305 2956 2512 SH SOLE NONE 365 0 2147 Alphabet Cl C CAP STK CL C 02079K107 3250 2770 SH SOLE NONE 1039 0 1731 Altria Group Inc COM 02209S103 989 17226 SH SOLE NONE 0 0 17226 Amazon.Com COM 023135106 4619 2594 SH SOLE NONE 995 0 1599 American Tower Corp COM 03027X100 6208 31505 SH SOLE NONE 8977 0 22528 American Water Works COM 030420103 3237 31045 SH SOLE NONE 8470 0 22575 Ametek Inc COM 031100100 2815 33925 SH SOLE NONE 13045 0 20880 Amgen Inc COM 031162100 743 3913 SH SOLE NONE 0 0 3913 Apple Computer Inc COM 037833100 4937 25990 SH SOLE NONE 4238 0 21752 At&t Corp Com New COM 00206R102 297 9475 SH SOLE NONE 0 0 9475 Bank Of Amer Corp COM 060505104 26 930 SH SOLE NONE 0 0 930 Berkshire Hathaway Class A CL A 084670108 301 1 SH SOLE NONE 0 0 1 Berkshire Hathaway Class B New CL B NEW 084670702 1877 9344 SH SOLE NONE 1195 0 8149 Blackrock Inc. COM 09247X101 3248 7599 SH SOLE NONE 2720 0 4879 Blackstone Group LP COM UNIT LTD 09253U108 223 6371 SH SOLE NONE 1449 0 4922 Booking Hldgs Inc COM 09857L108 1084 621 SH SOLE NONE 163 0 458 Bright Horizons Family COM 109194100 1861 14640 SH SOLE NONE 4900 0 9740 Bristol Myers Squibb Co COM 110122108 333 6983 SH SOLE NONE 0 0 6983 CME Group COM CL A 12572Q105 3631 22065 SH SOLE NONE 8015 0 14050 Celgene Corporation COM 151020104 109 1153 SH SOLE NONE 0 0 1153 Chevron Texaco Corp COM 166764100 410 3326 SH SOLE NONE 0 0 3326 Cisco Systems Inc COM 17275R102 780 14449 SH SOLE NONE 2496 0 11953 Coca Cola Co COM 191216100 225 4810 SH SOLE NONE 987 0 3823 Comcast Corp New Cl A CL A 20030N101 360 9006 SH SOLE NONE 0 0 9006 Danaher Corp COM 235851102 5369 40671 SH SOLE NONE 12741 0 27930 Disney Walt Co Holding Co COM DISNEY 254687106 317 2853 SH SOLE NONE 0 0 2853 Dover Corp COM 260003108 2456 26183 SH SOLE NONE 8510 0 17673 Ecolab Inc. COM 278865100 4017 22755 SH SOLE NONE 7328 0 15427 Emerson Electric Co COM 291011104 335 4892 SH SOLE NONE 0 0 4892 Equinix Inc COM 29444U700 2236 4935 SH SOLE NONE 1630 0 3305 Exxon Mobil Corp COM 30231G102 1368 16927 SH SOLE NONE 1200 0 15727 Facebook CL A 30303M102 493 2955 SH SOLE NONE 304 0 2651 First Republic Bank San Franci COM 33616C100 4467 44465 SH SOLE NONE 14320 0 30145 Fiserv Inc Wis COM 337738108 2925 33131 SH SOLE NONE 11622 0 21509 Genuine Parts Co COM 372460105 432 3854 SH SOLE NONE 0 0 3854 Home Depot Inc COM 437076102 1687 8794 SH SOLE NONE 0 0 8794 Idexx Laboratories Inc COM 45168D104 3263 14595 SH SOLE NONE 5425 0 9170 Illumina Inc COM 452327109 3367 10837 SH SOLE NONE 4195 0 6642 Intel Corp COM 458140100 245 4557 SH SOLE NONE 0 0 4557 Intl Business Mach COM 459200101 218 1548 SH SOLE NONE 0 0 1548 JP Morgan Chase COM 46625H100 8145 80456 SH SOLE NONE 10554 0 69902 Johnson & Johnson Com COM 478160104 3412 24405 SH SOLE NONE 7785 0 16620 Markel COM 570535104 1890 1897 SH SOLE NONE 571 0 1326 Massimo Corporation COM 574795100 1782 12884 SH SOLE NONE 4500 0 8384 Mastercard Inc. CL A 57636Q104 7446 31626 SH SOLE NONE 9295 0 22331 Medtronic Inc SHS G5960L103 415 4560 SH SOLE NONE 0 0 4560 Merck & Co Inc New Com COM 58933Y105 1118 13440 SH SOLE NONE 0 0 13440 Microsoft Corp Com COM 594918104 2178 18469 SH SOLE NONE 3312 0 15157 Morgan Stanley COM NEW 617446448 56 1320 SH SOLE NONE 0 0 1320 Netflix, Inc COM 64110L106 3181 8920 SH SOLE NONE 3470 0 5450 Nike Inc CL B 654106103 600 7130 SH SOLE NONE 0 0 7130 Novartis Ag Spon Adr SPONSORED ADR 66987V109 225 2339 SH SOLE NONE 0 0 2339 Pepsico Inc COM 713448108 377 3077 SH SOLE NONE 0 0 3077 Pfizer Inc Com COM 717081103 890 20950 SH SOLE NONE 890 0 20060 Philip Morris International COM 718172109 1108 12538 SH SOLE NONE 444 0 12094 Pnc Financial Services Group I COM 693475105 236 1928 SH SOLE NONE 0 0 1928 Price T Rowe Group Inc. COM 74144T108 436 4356 SH SOLE NONE 0 0 4356 Procter & Gamble Co COM 742718109 1688 16224 SH SOLE NONE 827 0 15397 Roper Technologies COM 776696106 5746 16802 SH SOLE NONE 5379 0 11423 Royal Dutch Shell Class A SPONS ADR A 780259206 1852 29582 SH SOLE NONE 0 0 29582 Steris Plc SHS USD G8473T100 1047 8179 SH SOLE NONE 3145 0 5034 Target Corp COM 87612E106 245 3054 SH SOLE NONE 0 0 3054 Teladoc Health Inc. COM 87918A105 717 12895 SH SOLE NONE 5850 0 7045 Teleflex Incorporated COM 879369106 2118 7010 SH SOLE NONE 2585 0 4425 Teradyne COM 880770102 1177 29546 SH SOLE NONE 15931 0 13615 Tyler Technologies Inc COM 902252105 1096 5360 SH SOLE NONE 2005 0 3355 Unilever Plc SPON ADR NEW 904767704 509 8814 SH SOLE NONE 0 0 8814 United Technologies Corp COM 913017109 400 3100 SH SOLE NONE 0 0 3100 V. F. Corporation COM 918204108 904 10407 SH SOLE NONE 40 0 10367 Varian Medical Systems COM 92220P105 227 1600 SH SOLE NONE 0 0 1600 Verizon Communications COM 92343V104 730 12347 SH SOLE NONE 0 0 12347 Visa Inc. COM CL A 92826C839 3403 21788 SH SOLE NONE 5237 0 16551 Wells Fargo & Co New COM 949746101 96 1988 SH SOLE NONE 0 0 1988 West Pharmaceuticals Services COM 955306105 2345 21279 SH SOLE NONE 6220 0 15059 Worldpay Inc. CL A 981558109 2808 24741 SH SOLE NONE 9441 0 15300 XYLEM Inc. COM 98419M100 1407 17795 SH SOLE NONE 6370 0 11425 Zoetis Inc. CL A 98978V103 2625 26080 SH SOLE NONE 9200 0 16880 ETF Ishares TR 2022 Term Corp IBONDS DEC22 ETF 46434VBA7 808 32425 SH SOLE NONE 0 0 32425 ISHARES TR DEC 2023 Term Cor IBONDS DEC23 ETF 46434VAX8 1090 43600 SH SOLE NONE 0 0 43600