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
Estimated average burden
hours per response: 23.8
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
AES Corp COM 00130H105 242 10,700 SH   SOLE NONE 0 0 10,700
Abbott Labs COM 002824100 1,912 19,756 SH   SOLE NONE 0 0 19,756
Abbott Labs COM 002824100 252 2,600 SH   OTR NONE 0 0 2,600
Abbvie Inc COM 00287Y109 2,012 14,988 SH   SOLE NONE 0 0 14,988
Alphabet Cl A CAP STK CL A 02079K305 3,453 36,100 SH   SOLE NONE 7,300 0 28,800
Alphabet Cl A CAP STK CL A 02079K305 258 2,700 SH   OTR NONE 0 0 2,700
Alphabet Cl C CAP STK CL C 02079K107 4,887 50,829 SH   SOLE NONE 18,360 0 32,469
Alphabet Cl C CAP STK CL C 02079K107 260 2,700 SH   OTR NONE 0 0 2,700
Amazon.Com COM 023135106 5,537 49,003 SH   SOLE NONE 14,160 0 34,843
American Tower Corp COM 03027X100 4,162 19,387 SH   SOLE NONE 6,810 0 12,577
American Tower Corp COM 03027X100 333 1,550 SH   OTR NONE 0 0 1,550
American Water Works COM 030420103 3,556 27,320 SH   SOLE NONE 8,113 0 19,207
Ametek Inc COM 031100100 3,347 29,515 SH   SOLE NONE 12,270 0 17,245
Amgen Inc COM 031162100 684 3,033 SH   SOLE NONE 0 0 3,033
Apple Computer Inc COM 037833100 14,705 106,405 SH   SOLE NONE 14,801 0 91,603
Apple Computer Inc COM 037833100 1,125 8,140 SH   OTR NONE 0 0 8,140
Applied Materials Inc COM 038222105 242 2,959 SH   SOLE NONE 0 0 2,959
Bank Of Amer Corp COM 060505104 270 8,933 SH   SOLE NONE 0 0 8,933
Berkshire Hathaway Class A CL A 084670108 406 1 SH   SOLE NONE 0 0 1
Berkshire Hathaway Class B New CL B NEW 084670702 3,852 14,425 SH   SOLE NONE 3,170 0 11,255
Blackrock Inc. COM 09247X101 4,635 8,422 SH   SOLE NONE 2,506 0 5,916
Blackstone Group Inc Cl A COM 09260D107 2,158 25,786 SH   SOLE NONE 7,186 0 18,600
Booking Hldgs Inc COM 09857L108 246 150 SH   SOLE NONE 0 0 150
Bristol Myers Squibb Co COM 110122108 570 8,022 SH   SOLE NONE 0 0 8,022
CME Group COM 12572Q105 4,589 25,909 SH   SOLE NONE 7,853 0 18,055
Cadence Design Sys Inc COM 127387108 845 5,169 SH   SOLE NONE 2,800 0 2,369
Chevron Texaco Corp COM 166764100 676 4,706 SH   OTR NONE 0 0 4,706
Cisco Systems Inc COM 17275R102 255 6,365 SH   SOLE NONE 0 0 6,365
Coca Cola Co COM 191216100 202 3,597 SH   SOLE NONE 987 0 2,610
Copart Inc. COM 217204106 2,574 24,191 SH   SOLE NONE 6,825 0 17,366
Danaher Corp COM 235851102 8,357 32,354 SH   SOLE NONE 10,111 0 22,243
Dover Corp COM 260003108 3,994 34,261 SH   SOLE NONE 9,862 0 24,398
Ecolab Inc. COM 278865100 2,834 19,625 SH   SOLE NONE 6,688 0 12,937
Emerson Electric Co COM 291011104 212 2,900 SH   SOLE NONE 0 0 2,900
Equinix Inc COM 29444U700 2,788 4,901 SH   SOLE NONE 1,695 0 3,206
Exxon Mobil Corp COM 30231G102 752 8,616 SH   OTR NONE 0 0 8,616
First Republic Bank San Franci COM 33616C100 1,333 10,209 SH   SOLE NONE 355 0 9,854
Genuine Parts Co COM 372460105 575 3,854 SH   SOLE NONE 0 0 3,854
Goldman Sachs Group Inc COM 38141G104 283 966 SH   SOLE NONE 36 0 930
Heico Corp. COM 422806109 3,236 22,475 SH   SOLE NONE 7,065 0 15,410
Home Depot Inc COM 437076102 1,157 4,194 SH   SOLE NONE 0 0 4,194
Home Depot Inc COM 437076102 243 880 SH   OTR NONE 0 0 880
Honeywell Inc COM 438516106 264 1,583 SH   SOLE NONE 0 0 1,583
Idexx Laboratories Inc COM 45168D104 2,889 8,868 SH   SOLE NONE 3,605 0 5,263
Illumina Inc COM 452327109 1,171 6,137 SH   SOLE NONE 3,525 0 2,612
Intuit COM 461202103 1,792 4,626 SH   SOLE NONE 1,325 0 3,301
Intuitive Surgical Inc. COM NEW 46120E602 626 3,340 SH   SOLE NONE 1,825 0 1,515
JP Morgan Chase COM 46625H100 6,211 59,436 SH   SOLE NONE 12,382 0 47,054
Johnson & Johnson Com COM 478160104 3,273 20,037 SH   SOLE NONE 7,785 0 12,252
Johnson & Johnson Com COM 478160104 315 1,930 SH   OTR NONE 0 0 1,930
MSCI COM 55354G100 3,305 7,836 SH   SOLE NONE 2,150 0 5,686
Markel COM 570535104 3,144 2,900 SH   SOLE NONE 832 0 2,068
Mastercard Inc. CL A 57636Q104 5,498 19,334 SH   SOLE NONE 5,575 0 13,759
Medtronic Inc SHS G5960L103 431 5,343 SH   SOLE NONE 0 0 5,343
Merck & Co Inc New Com COM 58933Y105 1,011 11,739 SH   SOLE NONE 0 0 11,739
Microsoft Corp Com COM 594918104 5,069 21,763 SH   SOLE NONE 3,413 0 18,350
Microsoft Corp Com COM 594918104 233 1,000 SH   OTR NONE 0 0 1,000
Netflix, Inc COM 64110L106 301 1,280 SH   SOLE NONE 680 0 600
Novartis Ag Spon Adr SPONSORED ADR 66987V109 415 5,463 SH   SOLE NONE 0 0 5,463
Nvidia Corp COM 67066G104 302 2,485 SH   SOLE NONE 885 0 1,600
Paycom Software Inc COM 70432V102 3,250 9,850 SH   SOLE NONE 2,520 0 7,330
Pepsico Inc COM 713448108 258 1,581 SH   SOLE NONE 0 0 1,581
Pfizer Inc Com COM 717081103 904 20,664 SH   SOLE NONE 0 0 20,664
Philip Morris International COM 718172109 201 2,427 SH   SOLE NONE 0 0 2,427
Procter & Gamble Co COM 742718109 917 7,265 SH   SOLE NONE 390 0 6,875
Procter & Gamble Co COM 742718109 240 1,900 SH   OTR NONE 0 0 1,900
Roper Technologies COM 776696106 4,874 13,552 SH   SOLE NONE 4,794 0 8,758
SBA Communications Corp. CL A 78410G104 274 962 SH   SOLE NONE 15 0 947
Steris Plc SHS USD G8473T100 1,976 11,884 SH   SOLE NONE 3,155 0 8,729
Target Corp COM 87612E106 515 3,473 SH   SOLE NONE 0 0 3,473
Teledyne Inc COM 879360105 2,155 6,385 SH   SOLE NONE 1,595 0 4,790
Teleflex Incorporated COM 879369106 403 2,000 SH   SOLE NONE 0 0 2,000
Teradyne COM 880770102 520 6,921 SH   SOLE NONE 1,920 0 5,001
Thermo Fisher Scientific COM 883556102 2,971 5,858 SH   SOLE NONE 1,720 0 4,138
Trade Web Markets, Inc. CL A 892672106 403 7,137 SH   SOLE NONE 4,650 0 2,487
Tyler Technologies Inc COM 902252105 3,122 8,984 SH   SOLE NONE 2,470 0 6,514
Veeva Systems, Inc. CL A COM 922475108 1,981 12,015 SH   SOLE NONE 3,830 0 8,185
Verizon Communications COM 92343V104 314 8,275 SH   SOLE NONE 0 0 8,275
Visa Inc. COM CL A 92826C839 3,166 17,822 SH   SOLE NONE 4,032 0 13,790
Visa Inc. COM CL A 92826C839 355 2,000 SH   OTR NONE 0 0 2,000
Wells Fargo & Co New COM 949746101 265 6,600 SH   OTR NONE 0 0 6,600
West Pharmaceuticals Services COM 955306105 3,566 14,493 SH   SOLE NONE 4,880 0 9,613
Zoetis Inc. CL A 98978V103 3,795 25,592 SH   SOLE NONE 8,265 0 17,327