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
ADAPTIVE BIOTECHNOLOGIES COR COM 00650F109 1,656 28,000 SH   SOLE 0 28,000 0 0
AES CORP COM 00130H105 50,735 2,158,937 SH   SOLE 0 2,158,937 0 0
AMAZON COM INC COM 023135106 49,427 15,176 SH   SOLE 0 15,176 0 0
AMERICAN INTL GROUP INC *W EXP 01/19/21 026874156 3 22,230 SH   SOLE 0 22,230 0 0
AMERICAN INTL GROUP INC COM NEW 026874784 811 21,411 SH   SOLE 0 21,411 0 0
AMERICAN TOWER CORP CL A 03027X100 136,660 608,838 SH   SOLE 0 608,838 0 0
ANTARES PHARMA INC COM 036642106 1,202 301,297 SH   SOLE 0 301,297 0 0
APPLE INC COM 037833100 44,553 335,766 SH   SOLE 0 335,766 0 0
ATOMERA INC COM 04965B100 3,862 239,996 SH   SOLE 0 239,996 0 0
BANK AMER CORP COM 060505104 28,032 924,841 SH   SOLE 0 924,841 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108 2,087 6 SH   SOLE 0 6 0 0
BERKSHIRE HATHAWAY INC DEL CL B 084670702 36,397 156,971 SH   SOLE 0 156,971 0 0
B O K FINL CORP COM NEW 05561Q201 9,206 134,440 SH   SOLE 0 134,440 0 0
BROOKFIELD ASSET MGMT INC CL A LTD VT SH 112585104 565 13,695 SH   SOLE 0 13,695 0 0
BROOKFIELD INFRASTRUCTURE CO COM SB VTG SHS A 11275Q107 791 10,937 SH   SOLE 0 10,937 0 0
BROOKFIELD INFRAST PARTNERS LP INT UNIT G16252101 6,096 123,410 SH   SOLE 0 123,410 0 0
CABLE ONE INC COM 12685J105 312 140 SH   SOLE 0 140 0 0
CARMAX INC COM 143130102 44,982 476,204 SH   SOLE 0 476,204 0 0
CITIGROUP INC COM NEW 172967424 2,788 45,213 SH   SOLE 0 45,213 0 0
CITY OFFICE REIT INC COM 178587101 617 63,200 SH   SOLE 0 63,200 0 0
COLONY CAP INC NEW CL A COM 19626G108 17,142 3,563,838 SH   SOLE 0 3,563,838 0 0
COLONY CR REAL ESTATE INC COM CL A 19625T101 75 10,000 SH   SOLE 0 10,000 0 0
COPART INC COM 217204106 49,892 392,078 SH   SOLE 0 392,078 0 0
COSTCO WHSL CORP NEW COM 22160K105 207 550 SH   SOLE 0 550 0 0
CYTOSORBENTS CORP COM NEW 23283X206 1,648 206,740 SH   SOLE 0 206,740 0 0
DENNYS CORP COM 24869P104 1,565 106,611 SH   SOLE 0 106,611 0 0
DOLLAR TREE INC COM 256746108 48,772 451,426 SH   SOLE 0 451,426 0 0
DUCK CREEK TECHNOLOGIES INC SHS 264120106 8,485 195,957 SH   SOLE 0 195,957 0 0
ENERGY RECOVERY INC COM 29270J100 21,427 1,570,863 SH   SOLE 0 1,570,863 0 0
ENERGY TRANSFER LP COM UT LTD PTN 29273V100 2,862 463,075 SH   SOLE 0 463,075 0 0
ENTERPRISE PRODS PARTNERS LP COM 293792107 2,480 126,608 SH   SOLE 0 126,608 0 0
ENVIVA PARTNERS LP COM UNIT 29414J107 1,136 25,000 SH   SOLE 0 25,000 0 0
EQUINIX COM NEW 29444U700 2,363 3,309 SH   SOLE 0 3,309 0 0
FAUQUIER BANKSHARES INC VA COM 312059108 278 16,000 SH   SOLE 0 16,000 0 0
GENERAL ELECTRIC CO COM 369604103 133 12,350 SH   SOLE 0 12,350 0 0
GLADSTONE COML CORP COM 376536108 1,673 92,950 SH   SOLE 0 92,950 0 0
IRON MTN INC NEW COM 46284V101 1,154 39,130 SH   SOLE 0 39,130 0 0
JPMORGAN CHASE & CO COM 46625H100 392 3,088 SH   SOLE 0 3,088 0 0
KINDER MORGAN INC COM 49456B101 2,069 151,320 SH   SOLE 0 151,320 0 0
LOCKHEED MARTIN CORP COM 539830109 38,869 109,495 SH   SOLE 0 109,495 0 0
LUNA INNOVATIONS COM 550351100 1,140 115,350 SH   SOLE 0 115,350 0 0
MACQUARIE INFRASTR CO LLC MEMBERSHIP INT 55608B105 4,071 108,422 SH   SOLE 0 108,422 0 0
MARKEL CORP COM 570535104 84,842 82,108 SH   SOLE 0 82,108 0 0
MASTERCARD INC CL A 57636Q104 30,303 84,896 SH   SOLE 0 84,896 0 0
MICROSOFT CORP COM 594918104 122,985 552,942 SH   SOLE 0 552,942 0 0
MPLX LP COM UNIT REP LTD 55336V100 4,982 230,132 SH   SOLE 0 230,132 0 0
NEW RESIDENTIAL INVT CORP COM NEW 64828T201 278 28,010 SH   SOLE 0 28,010 0 0
NOVAVAX INC COM 670002104 6,574 58,954 SH   SOLE 0 58,954 0 0
OPTIMIZERX CORP COM NEW 68401U204 21,960 704,756 SH   SOLE 0 704,756 0 0
O REILLY AUTOMOTIVE INC NEW COM 67103H107 40,363 89,187 SH   SOLE 0 89,187 0 0
PIONEER NAT RES CO COM 723787107 1,807 15,869 SH   SOLE 0 15,869 0 0
PROCTER AND GAMBLE CO COM 742718109 309 2,221 SH   SOLE 0 2,221 0 0
SBA COMMUNICATIONS CORP COM 78410G104 1,805 6,398 SH   SOLE 0 6,398 0 0
SPDR GOLD TRUST GOLD SHS 78463V107 316 1,769 SH   SOLE 0 1,769 0 0
SPROTT PHYSICAL GOLD TRUST UNIT 85207H104 586 38,860 SH   SOLE 0 38,860 0 0
STARWOOD PPTY TR INC COM 85571B105 1,156 59,877 SH   SOLE 0 59,877 0 0
STORE CAP CORP COM 862121100 222 6,528 SH   SOLE 0 6,528 0 0
TRUPANION INC COM 898202106 31,829 265,887 SH   SOLE 0 265,887 0 0
UNIVERSAL DISPLAY CORP COM 91347P105 49,391 214,929 SH   SOLE 0 214,929 0 0
VANGUARD INDEX FDS S&P 500 ETF SHS 922908363 663 1,930 SH   SOLE 0 1,930 0 0
VISA INC COM CL A 92826C839 18,130 82,890 SH   SOLE 0 82,890 0 0
DISNEY WALT CO COM DISNEY 254687106 547 3,020 SH   SOLE 0 3,020 0 0