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 117,978 2,674,638 SH   SOLE   2,674,638 0 0
ALIBABA GROUP HLDG LTD SPONSORED ADS 01609w102 470 3,335 SH   SOLE   3,335 0 0
ALIGN TECHNOLOGY INC COM 016255101 6,026 40,144 SH   SOLE   40,144 0 0
ALPHABET INC CAP STK CL A 02079K305 417,795 449,397 SH   SOLE   449,397 0 0
ALPHABET INC CAP STK CL C 02079K107 401,969 442,342 SH   SOLE   442,342 0 0
AMAZON COM INC COM 023135106 389,188 402,054 SH   SOLE   402,054 0 0
AMERICAN ELEC PWR INC COM 025537101 1,000 14,390 SH   SOLE   14,390 0 0
AMERICAN EXPRESS CO COM 025816109 1,158 13,751 SH   SOLE   13,751 0 0
APPFOLIO INC COM CL A 03783c100 821 25,177 SH   SOLE   25,177 0 0
ATHENAHEALTH INC COM 04685w103 43,071 306,444 SH   SOLE   306,444 0 0
BAIDU INC SPON ADR REP A 056752108 268,832 1,503,032 SH   SOLE   1,503,032 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108 937,296 3,680 SH   SOLE   3,680 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 373,816 2,207,099 SH   SOLE   2,207,099 0 0
BUILDERS FIRSTSOURCE INC COM 12008R107 82,858 5,408,465 SH   SOLE   5,408,465 0 0
CAPITAL ONE FINL CORP COM 14040H105 132,192 1,600,000 SH   SOLE   1,600,000 0 0
CARMAX INC COM 143130102 640,022 10,149,416 SH   SOLE   10,149,416 0 0
CHIPOTLE MEXICAN GRILL INC COM 169656105 211,353 507,937 SH   SOLE   507,937 0 0
COCA COLA CO COM 191216100 2,069 46,130 SH   SOLE   46,130 0 0
COSTCO WHSL CORP NEW COM 22160k105 3,726 23,300 SH   SOLE   23,300 0 0
CREDIT ACCEP CORP MICH COM 225310101 277,648 1,079,755 SH   SOLE   1,079,755 0 0
CRESUD S A C I F Y A SPONSORED ADR 226406106 11,998 616,883 SH   SOLE   616,883 0 0
D R HORTON INC COM 23331a109 15,729 455,000 SH   SOLE   455,000 0 0
DANAHER CORP DEL COM 235851102 139,079 1,648,054 SH   SOLE   1,648,054 0 0
DENTSPLY SIRONA INC COM 24906P109 573,827 8,849,888 SH   SOLE   8,849,888 0 0
EDISON INTL COM 281020107 2,963 37,900 SH   SOLE   37,900 0 0
EMCOR GROUP INC COM 29084q100 92,681 1,417,571 SH   SOLE   1,417,571 0 0
ETSY INC COM 29786a106 14,775 985,000 SH   SOLE   985,000 0 0
EXPEDITORS INTL WASH INC COM 302130109 407 7,209 SH   SOLE   7,209 0 0
EXXON MOBIL CORP COM 30231g102 338 4,185 SH   SOLE   4,185 0 0
FACEBOOK INC CL A 30303m102 45,992 304,624 SH   SOLE   304,624 0 0
FASTENAL CO COM 311900104 563 12,924 SH   SOLE   12,924 0 0
FIAT CHRYSLER AUTOMOBILES N SHS n31738102 212,937 20,031,657 SH   SOLE   20,031,657 0 0
GOLDMAN SACHS GROUP INC COM 38141g104 135,049 608,601 SH   SOLE   608,601 0 0
HDFC BANK LTD ADR REPS 3 SHS 40415f101 1,146 13,180 SH   SOLE   13,180 0 0
IAC INTERACTIVECORP COM 44919P508 124,425 1,205,205 SH   SOLE   1,205,205 0 0
IDEXX LABS INC COM 45168D104 543 3,365 SH   SOLE   3,365 0 0
INTERACTIVE BROKERS GROUP IN COM 45841n107 56,446 1,508,433 SH   SOLE   1,508,433 0 0
IRSA INVERSIONES Y REP S A GLOBL DEP RCPT 450047204 11,216 465,000 SH   SOLE   465,000 0 0
JACOBS ENGR GROUP INC DEL COM 469814107 283,131 5,205,567 SH   SOLE   5,205,567 0 0
JD COM INC SPON ADR CL A 47215P106 117,660 3,000,000 SH   SOLE   3,000,000 0 0
JPMORGAN CHASE & CO COM 46625h100 614 6,713 SH   SOLE   6,713 0 0
LENNOX INTL INC COM 526107107 349 1,903 SH   SOLE   1,903 0 0
LIBERTY MEDIA CORP DELAWARE COM SER A FRMLA 531229870 4,379 124,994 SH   SOLE   124,994 0 0
LIBERTY MEDIA CORP DELAWARE COM SER C FRMLA 531229854 541,141 14,777,202 SH   SOLE   2,846,922 0 0
MASTERCARD INCORPORATED CL A 57636q104 580,473 4,779,519 SH   SOLE   4,779,519 0 0
MERITAGE HOMES CORP COM 59001a102 13,293 315,000 SH   SOLE   315,000 0 0
MOHAWK INDS INC COM 608190104 317,303 1,312,851 SH   SOLE   1,312,851 0 0
O REILLY AUTOMOTIVE INC NEW COM 67103h107 349,716 1,598,775 SH   SOLE   1,598,775 0 0
OMNICOM GROUP INC COM 681919106 320,822 3,869,993 SH   SOLE   3,869,993 0 0
PRICELINE GRP INC COM NEW 741503403 327,863 175,279 SH   SOLE   175,279 0 0
PRIMERICA INC COM 74164M108 152,135 2,008,377 SH   SOLE   2,008,377 0 0
PROCTER AND GAMBLE CO COM 742718109 3,702 42,481 SH   SOLE   42,481 0 0
PROGRESSIVE CORP OHIO COM 743315103 774 17,557 SH   SOLE   17,557 0 0
RYANAIR HLDGS PLC SPONSORED ADR NE 783513203 547 5,081 SH   SOLE   5,081 0 0
SCHWAB CHARLES CORP NEW COM 808513105 352,903 8,214,679 SH   SOLE   8,214,679 0 0
SIGNET JEWELERS LIMITED SHS G81276100 4,116 65,091 SH   SOLE   65,091 0 0
SPS COMM INC COM 78463M107 32,467 509,201 SH   SOLE   509,201 0 0
THIRD PT REINS LTD COM g8827u100 42,106 3,029,190 SH   SOLE   3,029,190 0 0
TIME WARNER INC COM NEW 887317303 4,325 43,072 SH   SOLE   43,072 0 0
TJX COS INC NEW COM 872540109 663,149 9,188,711 SH   SOLE   9,188,711 0 0
TOLL BROTHERS INC COM 889478103 10,668 270,000 SH   SOLE   270,000 0 0
TRIMBLE INC COM 896239100 442 12,399 SH   SOLE   12,399 0 0
TRUPANION INC COM 898202106 40,179 1,795,300 SH   SOLE   1,795,300 0 0
UNION PAC CORP COM 907818108 4,491 41,235 SH   SOLE   41,235 0 0
VISA INC COM CL A 92826C839 240,065 2,559,878 SH   SOLE   2,559,878 0 0
WATERS CORP COM 941848103 328,888 1,788,992 SH   SOLE   1,788,992 0 0
WAYFAIR INC CL A 94419L101 16,553 215,316 SH   SOLE   215,316 0 0
WELLS FARGO CO NEW COM 949746101 272,068 4,910,081 SH   SOLE   4,910,081 0 0
WEST PHARMACEUTICAL SVSC INC COM 955306105 4,045 42,794 SH   SOLE   42,794 0 0
JPMORGAN CHASE & CO *W EXP 10/28/201 46634e114 30,174 600,000 SH   SOLE   600,000 0 0