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
ALIBABA GROUP HLDG LTD SPONSORED ADS 01609W102 413 1,945 SH   SOLE   1,945 0 0
ALPHABET INC CAP STK CL C 02079K107 970,844 726,125 SH   SOLE   726,125 0 0
ALPHABET INC CAP STK CL A 02079K305 369,729 276,043 SH   SOLE   276,043 0 0
AMAZON COM INC COM 023135106 289,056 156,429 SH   SOLE   156,429 0 0
AMERICAN ELEC PWR CO INC COM 025537101 840 8,892 SH   SOLE   8,892 0 0
ARISTA NETWORKS INC COM 040413106 354,063 1,740,724 SH   SOLE   1,740,724 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 325,230 1,435,893 SH   SOLE   1,435,893 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108 649,296 1,912 SH   SOLE   1,912 0 0
BOOKING HLDGS INC COM 09857L108 342,963 166,995 SH   SOLE   166,995 0 0
BUILDERS FIRSTSOURCE INC COM 12008R107 1,858 73,121 SH   SOLE   73,121 0 0
CARMAX INC COM 143130102 697,041 7,950,740 SH   SOLE   7,950,740 0 0
COCA COLA CO COM 191216100 789 14,260 SH   SOLE   14,260 0 0
CREDIT ACCEP CORP MICH COM 225310101 509,371 1,151,564 SH   SOLE   1,151,564 0 0
EDISON INTL COM 281020107 826 10,957 SH   SOLE   10,957 0 0
EXPEDITORS INTL WASH INC COM 302130109 7,968 102,132 SH   SOLE   102,132 0 0
FACEBOOK INC CL A 30303M102 466,697 2,273,800 SH   SOLE   2,273,800 0 0
FIAT CHRYSLER AUTOMOBILES N SHS N31738102 554 37,738 SH   SOLE   37,738 0 0
GTT COMMUNICATIONS INC COM 362393100 274 24,100 SH   SOLE   24,100 0 0
JACOBS ENGR GROUP INC COM 469814107 504,921 5,620,847 SH   SOLE   5,620,847 0 0
JD COM INC SPON ADR CL A 47215P106 423 12,000 SH   SOLE   12,000 0 0
JPMORGAN CHASE & CO COM 46625H100 238 1,708 SH   SOLE   1,708 0 0
LIBERTY BROADBAND CORP COM SER C 530307305 367,689 2,923,967 SH   SOLE   2,923,967 0 0
LIBERTY BROADBAND CORP COM SER A 530307107 125,725 1,009,350 SH   SOLE   1,009,350 0 0
LIBERTY MEDIA CORP DELAWARE COM SER A FRMLA 531229870 15,812 361,180 SH   SOLE   361,180 0 0
LIBERTY MEDIA CORP DELAWARE COM SER C FRMLA 531229854 466,640 10,152,070 SH   SOLE   10,152,070 0 0
MASTERCARD INC CL A 57636Q104 409,437 1,371,235 SH   SOLE   1,371,235 0 0
MOHAWK INDS INC COM 608190104 1,911 14,009 SH   SOLE   14,009 0 0
PROCTER & GAMBLE CO COM 742718109 825 6,602 SH   SOLE   6,602 0 0
RIMINI STR INC DEL COM 76674Q107 39 10,119 SH   SOLE   10,119 0 0
SAILPOINT TECHNLGIES HLDGS I COM 78781P105 378 16,032 SH   SOLE   16,032 0 0
TAIWAN SEMICONDUCTOR MFG LTD SPONSORED ADS 874039100 173,279 2,982,431 SH   SOLE   2,982,431 0 0
THE CHARLES SCHWAB CORPORATI COM 808513105 406,543 8,548,008 SH   SOLE   8,548,008 0 0
TJX COS INC NEW COM 872540109 497 8,141 SH   SOLE   8,141 0 0
UNION PACIFIC CORP COM 907818108 843 4,665 SH   SOLE   4,665 0 0
UNITEDHEALTH GROUP INC COM 91324P102 105,585 359,157 SH   SOLE   359,157 0 0
VISA INC COM CL A 92826C839 156,873 834,874 SH   SOLE   834,874 0 0
WAITR HLDGS INC COM 930752100 9 29,044 SH   SOLE   29,044 0 0
WAYFAIR INC CL A 94419L101 361,111 3,995,919 SH   SOLE   3,995,919 0 0
WELLS FARGO CO NEW COM 949746101 225 4,181 SH   SOLE   4,181 0 0