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 341 2,038 SH   SOLE   2,038 0 0
ALPHABET INC CAP STK CL C 02079K107 917,440 752,617 SH   SOLE   752,617 0 0
ALPHABET INC CAP STK CL A 02079K305 339,829 278,288 SH   SOLE   278,288 0 0
AMAZON COM INC COM 023135106 373,655 215,250 SH   SOLE   215,250 0 0
AMERICAN ELEC PWR CO INC COM 025537101 1,159 12,366 SH   SOLE   12,366 0 0
APPLE INC COM 037833100 224 1,000 SH   SOLE   1,000 0 0
ARISTA NETWORKS INC COM 040413106 860 3,600 SH   SOLE   3,600 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 282,793 1,359,451 SH   SOLE   1,359,451 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108 691,955 2,219 SH   SOLE   2,219 0 0
BOOKING HLDGS INC COM 09857L108 343,474 175,009 SH   SOLE   175,009 0 0
BUILDERS FIRSTSOURCE INC COM 12008R107 1,502 72,991 SH   SOLE   72,991 0 0
CARMAX INC COM 143130102 864,490 9,823,746 SH   SOLE   9,823,746 0 0
COCA COLA CO COM 191216100 1,063 19,531 SH   SOLE   19,531 0 0
COSTCO WHSL CORP NEW COM 22160K105 696 2,415 SH   SOLE   2,415 0 0
CREDIT ACCEP CORP MICH COM 225310101 497,988 1,079,509 SH   SOLE   1,079,509 0 0
EDISON INTL COM 281020107 1,092 14,480 SH   SOLE   14,480 0 0
EXPEDITORS INTL WASH INC COM 302130109 7,587 102,132 SH   SOLE   102,132 0 0
FACEBOOK INC CL A 30303M102 412,280 2,315,139 SH   SOLE   2,315,139 0 0
FIAT CHRYSLER AUTOMOBILES N SHS N31738102 489 37,738 SH   SOLE   37,738 0 0
GTT COMMUNICATIONS INC COM 362393100 227 24,100 SH   SOLE   24,100 0 0
IDEXX LABS INC COM 45168D104 312 1,146 SH   SOLE   1,146 0 0
JACOBS ENGR GROUP INC COM 469814107 532,668 5,821,512 SH   SOLE   5,821,512 0 0
JD COM INC SPON ADR CL A 47215P106 366 12,986 SH   SOLE   12,986 0 0
JPMORGAN CHASE & CO COM 46625H100 201 1,708 SH   SOLE   1,708 0 0
LIBERTY BROADBAND CORP COM SER A 530307107 106,986 1,023,590 SH   SOLE   1,023,590 0 0
LIBERTY BROADBAND CORP COM SER C 530307305 325,313 3,107,983 SH   SOLE   3,107,983 0 0
LIBERTY MEDIA CORP DELAWARE COM SER C FRMLA 531229854 503,041 12,095,236 SH   SOLE   12,095,236 0 0
LIBERTY MEDIA CORP DELAWARE COM SER A FRMLA 531229870 14,746 372,465 SH   SOLE   372,465 0 0
MASTERCARD INC CL A 57636Q104 385,528 1,419,626 SH   SOLE   1,419,626 0 0
MOHAWK INDS INC COM 608190104 174,377 1,405,473 SH   SOLE   1,405,473 0 0
PROCTER & GAMBLE CO COM 742718109 1,136 9,136 SH   SOLE   9,136 0 0
RIMINI STR INC DEL COM 76674Q107 44 10,119 SH   SOLE   10,119 0 0
SAILPOINT TECHNLGIES HLDGS I COM 78781P105 262 14,000 SH   SOLE   14,000 0 0
THE CHARLES SCHWAB CORPORATI COM 808513105 364,049 8,703,050 SH   SOLE   8,703,050 0 0
TJX COS INC NEW COM 872540109 958 17,181 SH   SOLE   17,181 0 0
UNION PACIFIC CORP COM 907818108 1,029 6,351 SH   SOLE   6,351 0 0
VISA INC COM CL A 92826C839 147,086 855,103 SH   SOLE   855,103 0 0
WAITR HLDGS INC COM 930752100 36 28,096 SH   SOLE   28,096 0 0
WAYFAIR INC CL A 94419L101 323,023 2,881,046 SH   SOLE   2,881,046 0 0
WELLS FARGO CO NEW COM 949746101 233 4,624 SH   SOLE   4,624 0 0