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 102,461 1,622,755 SH   SOLE   1,622,755 0 0
ALIBABA GROUP HLDG LTD SPONSORED ADS 01609w102 576 3,335 SH   SOLE   3,335 0 0
ALPHABET INC CAP STK CL A 02079K305 633,872 650,980 SH   SOLE   650,980 0 0
ALPHABET INC CAP STK CL C 02079K107 794,748 828,631 SH   SOLE   828,631 0 0
AMAZON COM INC COM 023135106 388,308 403,919 SH   SOLE   403,919 0 0
AMERICAN ELEC PWR INC COM 025537101 1,011 14,390 SH   SOLE   14,390 0 0
AMERICAN EXPRESS CO COM 025816109 1,221 13,500 SH   SOLE   13,500 0 0
ATHENAHEALTH INC COM 04685w103 24,531 197,257 SH   SOLE   197,257 0 0
BAIDU INC SPON ADR REP A 056752108 75,030 302,917 SH   SOLE   302,917 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108 1,051,979 3,829 SH   SOLE   3,829 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 382,661 2,087,391 SH   SOLE   2,087,391 0 0
BMC STK HLDGS INC COM 05591b109 55,510 2,600,000 SH   SOLE   2,600,000 0 0
BUILDERS FIRSTSOURCE INC COM 12008R107 97,298 5,408,465 SH   SOLE   5,408,465 0 0
CABLE ONE INC COM 12685J105 7,221 10,000 SH   SOLE   10,000 0 0
CAPITAL ONE FINL CORP COM 14040H105 135,541 1,601,000 SH   SOLE   1,601,000 0 0
CARMAX INC COM 143130102 729,715 9,625,581 SH   SOLE   9,625,581 0 0
CARS COM INC COM 14575e105 16,259 611,021 SH   SOLE   611,021 0 0
CHIPOTLE MEXICAN GRILL INC COM 169656105 47,081 152,944 SH   SOLE   152,944 0 0
COCA COLA CO COM 191216100 2,076 46,130 SH   SOLE   46,130 0 0
COSTCO WHSL CORP NEW COM 22160k105 3,480 21,184 SH   SOLE   21,184 0 0
CREDIT ACCEP CORP MICH COM 225310101 300,742 1,073,427 SH   SOLE   1,073,427 0 0
CRESUD S A C I F Y A SPONSORED ADR 226406106 11,517 616,883 SH   SOLE   616,883 0 0
D R HORTON INC COM 23331a109 18,168 455,000 SH   SOLE   455,000 0 0
DENTSPLY SIRONA INC COM 24906P109 531,750 8,890,655 SH   SOLE   8,890,655 0 0
EDISON INTL COM 281020107 2,925 37,900 SH   SOLE   37,900 0 0
EMCOR GROUP INC COM 29084Q100 100,001 1,441,346 SH   SOLE   1,441,346 0 0
ETSY INC COM 29786a106 9,959 590,000 SH   SOLE   590,000 0 0
EXPEDITORS INTL WASH INC COM 302130109 6,545 109,341 SH   SOLE   109,341 0 0
EXXON MOBIL CORP COM 30231g102 2,716 33,128 SH   SOLE   33,128 0 0
FACEBOOK INC CL A 30303m102 52,051 304,624 SH   SOLE   304,624 0 0
FASTENAL CO COM 311900104 233 5,122 SH   SOLE   5,122 0 0
FIAT CHRYSLER AUTOMOBILES N SHS n31738102 448,849 25,061,340 SH   SOLE   25,061,340 0 0
GOLDMAN SACHS GROUP INC COM 38141G104 135,118 569,663 SH   SOLE   569,663 0 0
GRAHAM HLDGS CO COM 384637104 5,851 10,000 SH   SOLE   10,000 0 0
HDFC BANK LTD ADR REPS 3 SHS 40415f101 874 9,074 SH   SOLE   9,074 0 0
IAC INTERACTIVECORP COM 44919P508 141,708 1,205,205 SH   SOLE   1,205,205 0 0
IDEXX LABS INC COM 45168D104 454 2,919 SH   SOLE   2,919 0 0
INTERACTIVE BROKERS GROUP IN COM 45841n107 77,167 1,713,298 SH   SOLE   1,713,298 0 0
IRSA INVERSIONES Y REP S A GLOBL DEP RCPT 450047204 14,018 571,000 SH   SOLE   571,000 0 0
JACOBS ENGR GROUP INC DEL COM 469814107 331,711 5,692,656 SH   SOLE   5,692,656 0 0
JD COM INC SPON ADR CL A 47215P106 152,800 4,000,000 SH   SOLE   4,000,000 0 0
LENNOX INTL INC COM 526107107 328 1,831 SH   SOLE   1,831 0 0
LIBERTY MEDIA CORP DELAWARE COM SER A FRMLA 531229870 4,496 123,205 SH   SOLE   123,205 0 0
LIBERTY MEDIA CORP DELAWARE COM SER C FRMLA 531229854 561,045 14,729,438 SH   SOLE   14,729,438 0 0
MASTERCARD INCORPORATED CL A 57636Q104 572,050 4,051,345 SH   SOLE   4,051,345 0 0
MERITAGE HOMES CORP COM 59001a102 13,986 315,000 SH   SOLE   315,000 0 0
MOHAWK INDS INC COM 608190104 340,959 1,377,558 SH   SOLE   1,377,558 0 0
O REILLY AUTOMOTIVE INC NEW COM 67103H107 286,486 1,330,204 SH   SOLE   1,330,204 0 0
OMNICOM GROUP INC COM 681919106 284,847 3,845,649 SH   SOLE   3,845,649 0 0
PRICELINE GRP INC COM NEW 741503403 319,775 174,662 SH   SOLE   174,662 0 0
PRIMERICA INC COM 74164M108 163,783 2,008,377 SH   SOLE   2,008,377 0 0
PROCTER AND GAMBLE CO COM 742718109 2,925 32,146 SH   SOLE   32,146 0 0
PROGRESSIVE CORP OHIO COM 743315103 850 17,557 SH   SOLE   17,557 0 0
RYANAIR HLDGS PLC SPONSORED ADR NE 783513203 533 5,058 SH   SOLE   5,058 0 0
SCHWAB CHARLES CORP NEW COM 808513105 365,165 8,348,548 SH   SOLE   8,348,548 0 0
SIGNET JEWELERS LIMITED SHS G81276100 4,271 64,174 SH   SOLE   64,174 0 0
SPS COMM INC COM 78463M107 43,401 765,318 SH   SOLE   765,318 0 0
THIRD PT REINS LTD COM g8827u100 5,704 365,637 SH   SOLE   365,637 0 0
TJX COS INC NEW COM 872540109 563,854 7,647,548 SH   SOLE   7,647,548 0 0
TOLL BROTHERS INC COM 889478103 11,197 270,000 SH   SOLE   270,000 0 0
TRIMBLE INC COM 896239100 478 12,186 SH   SOLE   12,186 0 0
TRUPANION INC COM 898202106 47,411 1,795,180 SH   SOLE   1,795,180 0 0
UNION PAC CORP COM 907818108 3,170 27,335 SH   SOLE   27,335 0 0
VISA INC COM CL A 92826C839 304,691 2,895,205 SH   SOLE   2,895,205 0 0
WATERS CORP COM 941848103 205,045 1,142,182 SH   SOLE   1,142,182 0 0
WAYFAIR INC CL A 94419L101 8,452 125,400 SH   SOLE   125,400 0 0
WELLS FARGO CO NEW COM 949746101 368,033 6,673,316 SH   SOLE   6,673,316 0 0
WEST PHARMACEUTICAL SVSC INC COM 955306105 3,984 41,383 SH   SOLE   41,383 0 0
JPMORGAN CHASE & CO *W EXP 10/28/201 46634e114 32,436 600,000 SH   SOLE   600,000 0 0