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
ALPHABET INC CL-A CL A 02079K305 5,891 5,638 SH   DFND   0 0 0
ALPHABET INC CL-C CL C 02079K107 35,411 34,193 SH   DFND   0 0 0
AMETEK INC COM 031100100 51,833 765,626 SH   DFND   0 0 0
APPLE INC COM 037833100 344 2,178 SH   SOLE   0 0 0
BALCHEM CORP COM 057665200 178 2,266 SH   DFND   0 0 0
BANK OZK COM 06417N103 15,342 671,992 SH   DFND   0 0 0
BERKSHIRE HATHAWAY-A-NEW CL A 084670108 918 3 SH   DFND   0 0 0
BERKSHIRE HATHAWAY-B-NEW CL B 084670702 164,981 808,018 SH   DFND   0 0 0
BROOKFIELD ASSET MGT-A LV CL A 112585104 496 12,938 SH   DFND   0 0 0
CARMAX INC COM 143130102 72,490 1,155,593 SH   DFND   0 0 0
DISNEY WALT COMPANY COM 254687106 21,016 191,663 SH   DFND   0 0 0
EDWARDS LIFESCIENCES CORP COM 28176E108 18,714 122,178 SH   DFND   0 0 0
FACEBOOK INC CL-A CL A 30303M102 15,320 116,870 SH   DFND   0 0 0
FASTENAL CO COM 311900104 213 4,077 SH   DFND   0 0 0
FIVE BELOW INC COM 33829M101 368 3,596 SH   DFND   0 0 0
FORTUNE BRNDS HME&SEC COM 34964C106 22,205 584,497 SH   DFND   0 0 0
HEICO CORP CLASS A CL A 422806208 28,770 456,666 SH   DFND   0 0 0
JP MORGAN CHASE & CO COM 46625H100 29,500 302,194 SH   DFND   0 0 0
LIBERTY MEDIA-C LIB FORM CL C 531229854 20,432 665,538 SH   DFND   0 0 0
LITTELFUSE INC COM 537008104 17,368 101,282 SH   SOLE   0 0 0
LKQ CORP COM 501889208 10,277 433,083 SH   DFND   0 0 0
LULULEMON ATHLETICA INC CO COM 550021109 559 4,600 SH   SOLE   0 0 0
M & T BANK CORP COM 55261F104 17,714 123,764 SH   DFND   0 0 0
MARKEL CORP HOLDING COM 570535104 35,748 34,438 SH   DFND   0 0 0
MASTERCARD INC CL-A CL A 57636Q104 391 2,074 SH   DFND   0 0 0
MOHAWK INDS INC COM 608190104 26,191 223,935 SH   DFND   0 0 0
O'REILLY AUTOMOTIVE COM 67103H107 17,269 50,152 SH   DFND   0 0 0
SOUTHWEST AIRLINES CO COM 844741108 184 3,961 SH   DFND   0 0 0
SPDR S&P 500 ETF TR TR UNIT 78462F103 1,323 5,295 SH   DFND   0 0 0
UNION PACIFIC CORP COM 907818108 26,865 194,347 SH   DFND   0 0 0
VISA INC CLASS-A CL A 92826C839 39,287 297,762 SH   DFND   0 0 0
TJX COMPANIES INC CM COM 872540109 489 10,934 SH   DFND   0 0 0
SCHWAB CHARLES CORP COM 808513105 27,590 664,346 SH   DFND   0 0 0
NVR INC COM 62944T105 32,643 13,395 SH   DFND   0 0 0
HEALTH CARE SERVICES GRP COM 421906108 372 9,266 SH   DFND   0 0 0