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 CAP STK CL A 02079K305 301,478 278,424 SH   SOLE   278,424 0 0
ALPHABET INC CAP STK CL C 02079K107 808,556 748,033 SH   SOLE   748,033 0 0
ALTABA INC COM 021346101 1,045 15,068 SH   SOLE   15,068 0 0
AMAZON COM INC COM 023135106 411,480 217,297 SH   SOLE   217,297 0 0
AMERICAN ELEC PWR CO INC COM 025537101 1,152 13,090 SH   SOLE   13,090 0 0
ARISTA NETWORKS INC COM 040413106 935 3,600 SH   SOLE   3,600 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 292,540 1,372,332 SH   SOLE   1,372,332 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108 718,198 2,256 SH   SOLE   2,256 0 0
BOOKING HLDGS INC COM 09857L108 330,748 176,426 SH   SOLE   176,426 0 0
BUILDERS FIRSTSOURCE INC COM 12008R107 1,239 73,480 SH   SOLE   73,480 0 0
CARMAX INC COM 143130102 861,357 9,920,039 SH   SOLE   9,920,039 0 0
COCA COLA CO COM 191216100 1,165 22,888 SH   SOLE   22,888 0 0
COSTCO WHSL CORP NEW COM 22160K105 655 2,479 SH   SOLE   2,479 0 0
CREDIT ACCEP CORP MICH COM 225310101 525,702 1,086,543 SH   SOLE   1,086,543 0 0
DENTSPLY SIRONA INC COM 24906P109 234 4,018 SH   SOLE   4,018 0 0
EDISON INTL COM 281020107 1,277 18,939 SH   SOLE   18,939 0 0
EXPEDITORS INTL WASH INC COM 302130109 7,748 102,132 SH   SOLE   102,132 0 0
FACEBOOK INC CL A 30303M102 407,709 2,112,481 SH   SOLE   2,112,481 0 0
FIAT CHRYSLER AUTOMOBILES N SHS N31738102 527 38,165 SH   SOLE   38,165 0 0
IDEXX LABS INC COM 45168D104 316 1,146 SH   SOLE   1,146 0 0
JACOBS ENGR GROUP INC COM 469814107 495,817 5,875,311 SH   SOLE   5,875,311 0 0
JD COM INC SPON ADR CL A 47215P106 403 13,319 SH   SOLE   13,319 0 0
LIBERTY BROADBAND CORP COM SER A 530307107 106,062 1,031,326 SH   SOLE   1,031,326 0 0
LIBERTY BROADBAND CORP COM SER C 530307305 327,173 3,139,251 SH   SOLE   3,139,251 0 0
LIBERTY MEDIA CORP DELAWARE COM SER C FRMLA 531229854 459,074 12,271,419 SH   SOLE   12,271,419 0 0
LIBERTY MEDIA CORP DELAWARE COM SER A FRMLA 531229870 13,366 372,740 SH   SOLE   372,740 0 0
MASTERCARD INC CL A 57636Q104 533,534 2,016,913 SH   SOLE   2,016,913 0 0
MOHAWK INDS INC COM 608190104 208,530 1,414,049 SH   SOLE   1,414,049 0 0
PROCTER AND GAMBLE CO COM 742718109 1,203 10,971 SH   SOLE   10,971 0 0
RIMINI STR INC DEL COM 76674Q107 57 10,779 SH   SOLE   10,779 0 0
SAILPOINT TECHNLGIES HLDGS I COM 78781P105 281 14,000 SH   SOLE   14,000 0 0
THE CHARLES SCHWAB CORPORATI COM 808513105 352,070 8,760,150 SH   SOLE   8,760,150 0 0
TJX COS INC NEW COM 872540109 918 17,364 SH   SOLE   17,364 0 0
UNION PACIFIC CORP COM 907818108 1,138 6,731 SH   SOLE   6,731 0 0
VISA INC COM CL A 92826C839 251,215 1,447,506 SH   SOLE   1,447,506 0 0
WAITR HLDGS INC COM 930752100 94 14,882 SH   SOLE   14,882 0 0
WELLS FARGO CO NEW COM 949746101 232 4,899 SH   SOLE   4,899 0 0