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 C 02079K107 953,707 854,844 SH   SOLE   854,844 0 0
ALPHABET INC CAP STK CL A 02079K305 937,775 830,485 SH   SOLE   830,485 0 0
ALTABA INC COM 021346101 293,093 4,003,459 SH   SOLE   4,003,459 0 0
AMAZON COM INC COM 023135106 820,832 482,899 SH   SOLE   482,899 0 0
AMERICAN ELEC PWR INC COM 025537101 997 14,390 SH   SOLE   14,390 0 0
AMERICAN EXPRESS CO COM 025816109 1,348 13,751 SH   SOLE   13,751 0 0
BAIDU INC SPON ADR REP A 056752108 48,600 200,000 SH   SOLE   200,000 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108 828,069 2,936 SH   SOLE   2,936 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 270,507 1,449,276 SH   SOLE   1,449,276 0 0
BMC STK HLDGS INC COM 05591B109 83,400 4,000,000 SH   SOLE   4,000,000 0 0
BOOKING HLDGS INC COM 09857L108 352,693 173,990 SH   SOLE   173,990 0 0
BRASILAGRO BRAZILIAN AGRIC R SPONSORED ADR 10554B104 47 13,460 SH   SOLE   13,460 0 0
BUILDERS FIRSTSOURCE INC COM 12008R107 102,559 5,607,377 SH   SOLE   5,607,377 0 0
CARMAX INC COM 143130102 870,804 11,950,104 SH   SOLE   11,950,104 0 0
COCA COLA CO COM 191216100 1,650 37,630 SH   SOLE   37,630 0 0
COSTCO WHSL CORP NEW COM 22160K105 4,328 20,709 SH   SOLE   20,709 0 0
CREDIT ACCEP CORP MICH COM 225310101 388,809 1,100,194 SH   SOLE   1,100,194 0 0
CRESUD S A C I F Y A SPONSORED ADR 226406106 9,142 616,883 SH   SOLE   616,883 0 0
D R HORTON INC COM 23331A109 20,500 500,000 SH   SOLE   500,000 0 0
DENTSPLY SIRONA INC COM 24906P109 1,280 29,241 SH   SOLE   29,241 0 0
EDISON INTL COM 281020107 1,909 30,165 SH   SOLE   30,165 0 0
EMCOR GROUP INC COM 29084Q100 723 9,492 SH   SOLE   9,492 0 0
EXPEDITORS INTL WASH INC COM 302130109 7,987 109,267 SH   SOLE   109,267 0 0
FACEBOOK INC CL A 30303M102 476,195 2,450,572 SH   SOLE   2,450,572 0 0
FASTENAL CO COM 311900104 242 5,026 SH   SOLE   5,026 0 0
FIAT CHRYSLER AUTOMOBILES N SHS N31738102 463,550 24,539,430 SH   SOLE   24,539,430 0 0
GOLDMAN SACHS GROUP INC COM 38141G104 1,416 6,421 SH   SOLE   6,421 0 0
GTT COMMUNICATIONS INC COM 362393100 76,982 1,805,008 SH   SOLE   1,805,008 0 0
IDEXX LABS INC COM 45168D104 390 1,789 SH   SOLE   1,789 0 0
IQIYI INC SPONSORED ADS 46267X108 20,349 630,000 SH   SOLE   630,000 0 0
IRSA INVERSIONES Y REP S A GLOBL DEP RCPT 450047204 6,399 370,085 SH   SOLE   370,085 0 0
IRSA PROPIEDADES COMERCIALES SPONSORED ADR 463588103 3,254 105,000 SH   SOLE   105,000 0 0
JACOBS ENGR GROUP INC DEL COM 469814107 411,582 6,482,623 SH   SOLE   6,482,623 0 0
JD COM INC SPON ADR CL A 47215P106 234,875 6,030,158 SH   SOLE   6,030,158 0 0
JPMORGAN CHASE & CO *W EXP 10/28/201 46634E114 38,058 600,000 SH   SOLE   600,000 0 0
LIBERTY BROADBAND CORP COM SER C 530307305 266,408 3,518,328 SH   SOLE   3,518,328 0 0
LIBERTY BROADBAND CORP COM SER A 530307107 86,383 1,142,031 SH   SOLE   1,142,031 0 0
LIBERTY MEDIA CORP DELAWARE COM SER A FRMLA 531229870 12,569 355,975 SH   SOLE   355,975 0 0
LIBERTY MEDIA CORP DELAWARE COM SER C FRMLA 531229854 556,883 14,998,201 SH   SOLE   14,998,201 0 0
MASTERCARD INCORPORATED CL A 57636Q104 556,279 2,830,648 SH   SOLE   2,830,648 0 0
MERITAGE HOMES CORP COM 59001A102 19,426 442,000 SH   SOLE   442,000 0 0
MOHAWK INDS INC COM 608190104 296,197 1,382,355 SH   SOLE   1,382,355 0 0
NETSHOES CAYMAN LTD COM G6455X107 5,570 2,350,000 SH   SOLE   2,350,000 0 0
O REILLY AUTOMOTIVE INC NEW COM 67103H107 3,570 13,051 SH   SOLE   13,051 0 0
OMNICOM GROUP INC COM 681919106 1,001 13,126 SH   SOLE   13,126 0 0
PRIMERICA INC COM 74164M108 471 4,727 SH   SOLE   4,727 0 0
PROCTER AND GAMBLE CO COM 742718109 1,386 17,760 SH   SOLE   17,760 0 0
PROGRESSIVE CORP OHIO COM 743315103 1,020 17,248 SH   SOLE   17,248 0 0
RH COM 74967X103 27,940 200,000 SH   SOLE   200,000 0 0
SCHWAB CHARLES CORP NEW COM 808513105 422,388 8,265,912 SH   SOLE   8,265,912 0 0
SECOO HLDG LTD ADR 81367P101 1,329 164,446 SH   SOLE   164,446 0 0
SINCLAIR BROADCAST GROUP INC CL A 829226109 64,300 2,000,000 SH   SOLE   2,000,000 0 0
SPS COMM INC COM 78463M107 12,124 165,000 SH   SOLE   165,000 0 0
TJX COS INC NEW COM 872540109 557,000 5,852,066 SH   SOLE   5,852,066 0 0
TRIMBLE INC COM 896239100 401 12,213 SH   SOLE   12,213 0 0
UNION PAC CORP COM 907818108 1,944 13,720 SH   SOLE   13,720 0 0
VISA INC COM CL A 92826C839 274,152 2,069,853 SH   SOLE   2,069,853 0 0
WATERS CORP COM 941848103 1,803 9,316 SH   SOLE   9,316 0 0
WELLS FARGO CO NEW COM 949746101 233,660 4,214,651 SH   SOLE   4,214,651 0 0
WEST PHARMACEUTICAL SVSC INC COM 955306105 2,304 23,200 SH   SOLE   23,200 0 0
YANDEX N V SHS CLASS A N97284108 21,361 595,000 SH   SOLE   595,000 0 0