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
58 COM INC SPON ADR REP A 31680q104 80,233 1,121,037 SH   SOLE   1,121,037 0 0
ALIBABA GROUP HLDG LTD SPONSORED ADS 01609w102 368 2,134 SH   SOLE   2,134 0 0
ALPHABET INC CAP STK CL A 02079K305 886,173 841,250 SH   SOLE   841,250 0 0
ALPHABET INC CAP STK CL C 02079K107 860,970 822,793 SH   SOLE   822,793 0 0
AMAZON COM INC COM 023135106 916,569 783,747 SH   SOLE   783,747 0 0
AMERICAN ELEC PWR INC COM 025537101 1,059 14,390 SH   SOLE   14,390 0 0
AMERICAN EXPRESS CO COM 025816109 1,366 13,751 SH   SOLE   13,751 0 0
ATHENAHEALTH INC COM 04685w103 325 2,441 SH   SOLE   2,441 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108 1,095,466 3,681 SH   SOLE   3,681 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 402,679 2,031,475 SH   SOLE   2,031,475 0 0
BMC STK HLDGS INC COM 05591b109 99,004 3,913,196 SH   SOLE   3,913,196 0 0
BUILDERS FIRSTSOURCE INC COM 12008R107 89,500 4,107,377 SH   SOLE   4,107,377 0 0
CAPITAL ONE FINL CORP COM 14040H105 159,428 1,601,000 SH   SOLE   1,601,000 0 0
CARMAX INC COM 143130102 425,280 6,631,532 SH   SOLE   6,631,532 0 0
CARS COM INC COM 14575e105 17,595 610,078 SH   SOLE   610,078 0 0
CHIPOTLE MEXICAN GRILL INC COM 169656105 41,810 144,656 SH   SOLE   144,656 0 0
COCA COLA CO COM 191216100 2,116 46,130 SH   SOLE   46,130 0 0
COSTCO WHSL CORP NEW COM 22160k105 3,936 21,150 SH   SOLE   21,150 0 0
CREDIT ACCEP CORP MICH COM 225310101 346,233 1,070,338 SH   SOLE   1,070,338 0 0
CRESUD S A C I F Y A SPONSORED ADR 226406106 13,627 616,883 SH   SOLE   616,883 0 0
D R HORTON INC COM 23331a109 7,150 140,000 SH   SOLE   140,000 0 0
DENTSPLY SIRONA INC COM 24906P109 582,653 8,850,874 SH   SOLE   8,850,874 0 0
EDISON INTL COM 281020107 2,192 34,665 SH   SOLE   34,665 0 0
EMCOR GROUP INC COM 29084q100 2,289 27,994 SH   SOLE   27,994 0 0
ETSY INC COM 29786a106 12,066 590,000 SH   SOLE   590,000 0 0
EXPEDITORS INTL WASH INC COM 302130109 7,073 109,341 SH   SOLE   109,341 0 0
EXXON MOBIL CORP COM 30231g102 312 3,728 SH   SOLE   3,728 0 0
FACEBOOK INC CL A 30303m102 53,754 304,624 SH   SOLE   304,624 0 0
FASTENAL CO COM 311900104 356 6,503 SH   SOLE   6,503 0 0
FIAT CHRYSLER AUTOMOBILES N SHS n31738102 447,059 25,059,365 SH   SOLE   25,059,365 0 0
FRESENIUS MED CARE AG&CO KGA SPONSORED ADR 358029106 535 10,185 SH   SOLE   10,185 0 0
GOLDMAN SACHS GROUP INC COM 38141g104 135,069 530,183 SH   SOLE   530,183 0 0
HDFC BANK LTD ADR REPS 3 SHS 40415f101 923 9,074 SH   SOLE   9,074 0 0
IAC INTERACTIVECORP COM 44919P508 98,060 801,930 SH   SOLE   801,930 0 0
IDEXX LABS INC COM 45168D104 370 2,365 SH   SOLE   2,365 0 0
INTERACTIVE BROKERS GROUP IN COM 45841n107 59,415 1,003,467 SH   SOLE   1,003,467 0 0
IRSA INVERSIONES Y REP S A GLOBL DEP RCPT 450047204 16,902 571,000 SH   SOLE   571,000 0 0
JACOBS ENGR GROUP INC DEL COM 469814107 374,134 5,672,134 SH   SOLE   5,672,134 0 0
JD COM INC SPON ADR CL A 47215P106 274,375 6,624,213 SH   SOLE   6,624,213 0 0
JPMORGAN CHASE & CO *W EXP 10/28/201 46634e114 39,858 600,000 SH   SOLE   600,000 0 0
LENNOX INTL INC COM 526107107 381 1,831 SH   SOLE   1,831 0 0
LIBERTY MEDIA CORP DELAWARE COM SER A FRMLA 531229870 3,951 120,742 SH   SOLE   120,742 0 0
LIBERTY MEDIA CORP DELAWARE COM SER C FRMLA 531229854 502,462 14,709,072 SH   SOLE   14,709,072 0 0
MASTERCARD INCORPORATED CL A 57636q104 604,982 3,996,977 SH   SOLE   3,996,977 0 0
MERITAGE HOMES CORP COM 59001a102 16,128 315,000 SH   SOLE   315,000 0 0
MOHAWK INDS INC COM 608190104 377,655 1,368,810 SH   SOLE   1,368,810 0 0
NETSHOES CAYMAN LTD COM g6455x107 11,155 1,412,000 SH   SOLE   1,412,000 0 0
O REILLY AUTOMOTIVE INC NEW COM 67103h107 292,075 1,214,248 SH   SOLE   1,214,248 0 0
OMNICOM GROUP INC COM 681919106 278,332 3,821,664 SH   SOLE   3,821,664 0 0
PRICELINE GRP INC COM NEW 741503403 302,183 173,894 SH   SOLE   173,894 0 0
PRIMERICA INC COM 74164M108 102,326 1,007,642 SH   SOLE   1,007,642 0 0
PROCTER AND GAMBLE CO COM 742718109 2,816 30,646 SH   SOLE   30,646 0 0
PROGRESSIVE CORP OHIO COM 743315103 989 17,557 SH   SOLE   17,557 0 0
RYANAIR HLDGS PLC SPONSORED ADR NE 783513203 525 5,037 SH   SOLE   5,037 0 0
SCHWAB CHARLES CORP NEW COM 808513105 426,836 8,309,056 SH   SOLE   8,309,056 0 0
SINCLAIR BROADCAST GROUP INC CL A 829226109 51,665 1,365,000 SH   SOLE   1,365,000 0 0
SPS COMM INC COM 78463M107 38,655 795,536 SH   SOLE   795,536 0 0
TJX COS INC NEW COM 872540109 579,527 7,579,475 SH   SOLE   7,579,475 0 0
TRIMBLE INC COM 896239100 496 12,213 SH   SOLE   12,213 0 0
UNION PAC CORP COM 907818108 3,154 23,520 SH   SOLE   23,520 0 0
VISA INC COM CL A 92826C839 329,423 2,889,168 SH   SOLE   2,889,168 0 0
WAL-MART STORES INC COM 931142103 204 2,067 SH   SOLE   2,067 0 0
WATERS CORP COM 941848103 219,446 1,135,909 SH   SOLE   1,135,909 0 0
WAYFAIR INC CL A 94419L101 93,260 1,161,823 SH   SOLE   1,161,823 0 0
WELLS FARGO CO NEW COM 949746101 402,388 6,632,404 SH   SOLE   6,632,404 0 0
WEST PHARMACEUTICAL SVSC INC COM 955306105 2,537 25,713 SH   SOLE   25,713 0 0