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
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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 351,936 248,183 SH   SOLE   248,183 0 0
ALPHABET INC CAP STK CL C 02079K107 726,774 514,126 SH   SOLE   514,126 0 0
AMAZON COM INC COM 023135106 318,211 115,343 SH   SOLE   115,343 0 0
AMERICAN ELEC PWR CO INC COM 025537101 532 6,686 SH   SOLE   6,686 0 0
ANGI HOMESERVICES INC COM CL A 00183L102 178 14,674 SH   SOLE   14,674 0 0
ARISTA NETWORKS INC COM 040413106 415,440 1,978,002 SH   SOLE   1,978,002 0 0
Alibaba Group Sh ADR SPONSORED ADS 01609W102 420 1,945 SH   SOLE   1,945 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 197,414 1,105,900 SH   SOLE   1,105,900 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108 274,784 1,028 SH   SOLE   1,028 0 0
BUILDERS FIRSTSOURCE INC COM 12008R107 1,647 79,562 SH   SOLE   79,562 0 0
CARMAX INC COM 143130102 602,625 6,729,480 SH   SOLE   6,729,480 0 0
COCA COLA CO COM 191216100 471 10,550 SH   SOLE   10,550 0 0
CREDIT ACCEP CORP MICH COM 225310101 505,415 1,206,213 SH   SOLE   1,206,213 0 0
DISNEY WALT CO COM DISNEY 254687106 313,816 2,814,237 SH   SOLE   2,814,237 0 0
EDISON INTL COM 281020107 427 7,868 SH   SOLE   7,868 0 0
EXPEDITORS INTL WASH INC COM 302130109 7,766 102,132 SH   SOLE   102,132 0 0
Facebook Inc Cl A CL A 30303M102 520,517 2,292,319 SH   SOLE   2,292,319 0 0
Fiat Chrysler Automobiles NV s SHS N31738102 387 37,777 SH   SOLE   37,777 0 0
GTT COMMUNICATIONS INC COM 362393100 197 24,100 SH   SOLE   24,100 0 0
JACOBS ENGR GROUP INC COM 469814107 355,991 4,198,002 SH   SOLE   4,198,002 0 0
JD.COM INC SPON ADR CL A 47215P106 722 12,000 SH   SOLE   12,000 0 0
LIBERTY BROADBAND CORP COM SER C 530307305 276,691 2,232,097 SH   SOLE   2,232,097 0 0
LIBERTY BROADBAND CORP COM SER A 530307107 119,718 979,772 SH   SOLE   979,772 0 0
LIBERTY MEDIA CORP DEL COM SER C FRMLA 531229854 324,361 10,228,970 SH   SOLE   10,228,970 0 0
LIBERTY MEDIA CORP DEL COM SER A FRMLA 531229870 10,158 348,113 SH   SOLE   348,113 0 0
MASTERCARD INCORPORATED CL A 57636Q104 295,087 997,928 SH   SOLE   997,928 0 0
MOHAWK INDS INC COM 608190104 1,102 10,833 SH   SOLE   10,833 0 0
PROCTER AND GAMBLE CO COM 742718109 615 5,144 SH   SOLE   5,144 0 0
SCHWAB CHARLES CORP COM 808513105 331,849 9,835,466 SH   SOLE   9,835,466 0 0
SINCLAIR BROADCAST GROUP INC CL A 829226109 385 20,845 SH   SOLE   20,845 0 0
Sailpoint Technologies Holding COM 78781P105 388 14,663 SH   SOLE   14,663 0 0
TAIWAN SEMICONDUCTOR MFG LTD SPONSORED ADS 874039100 387,595 6,827,455 SH   SOLE   6,827,455 0 0
UNION PAC CORP COM 907818108 568 3,360 SH   SOLE   3,360 0 0
Unitedhealth Group Inc COM 91324P102 422,945 1,433,955 SH   SOLE   1,433,955 0 0
VISA INC COM CL A 92826C839 107,924 558,702 SH   SOLE   558,702 0 0
WAITR HLDGS INC COM 930752100 50 18,989 SH   SOLE   18,989 0 0
WAYFAIR INC CL A 94419L101 586,675 2,968,852 SH   SOLE   2,968,852 0 0