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
ABEONA THERAPEUTICS INC COM 00289Y107 634 132,615 SH   SOLE   132,615 0 0
ADAPTIMMUNE THERAPEUTICS PLC SPONDS ADR 00653A107 667 165,947 SH   SOLE   165,947 0 0
ADVERUM BIOTECHNOLOGIES INC COM 00773U108 7,303 614,199 SH   SOLE   614,199 0 0
ALLEGHENY TECHNOLOGIES INC COM 01741R102 47,463 1,883,466 SH   SOLE   1,883,466 0 0
ALPHABET INC CAP STK CL A 02079K305 67,861 62,672 SH   SOLE   62,672 0 0
AMAZON COM INC COM 023135106 8,595 4,539 SH   SOLE   4,539 0 0
APPLE INC COM 037833100 22,615 114,264 SH   SOLE   114,264 0 0
ASA GOLD AND PRECIOUS MTLS L SHS G3156P103 7,811 682,758 SH   SOLE   682,758 0 0
AUDENTES THERAPEUTICS INC COM 05070R104 4,978 131,495 SH   SOLE   131,495 0 0
AUTONATION INC COM 05329W102 6,875 163,921 SH   SOLE   163,921 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108 312,938 983 SH   SOLE   983 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 142,416 668,086 SH   SOLE   668,086 0 0
BIOMARIN PHARMACEUTICAL INC COM 09061G101 3,835 44,775 SH   SOLE   44,775 0 0
BLACK KNIGHT INC COM 09215C105 5,111 84,968 SH   SOLE   84,968 0 0
BLUEBIRD BIO INC COM 09609G100 2,049 16,109 SH   SOLE   16,109 0 0
CARMAX INC COM 143130102 30,852 355,319 SH   SOLE   355,319 0 0
CARVANA CO CL A 146869102 47,576 760,118 SH   SOLE   760,118 0 0
CELLECTIS S A SPONSORED ADS 15117K103 1,141 73,124 SH   SOLE   73,124 0 0
CHIPOTLE MEXICAN GRILL INC COM 169656105 27,718 37,821 SH   SOLE   37,821 0 0
CONOCOPHILLIPS COM 20825C104 14,581 239,039 SH   SOLE   239,039 0 0
COSTCO WHSL CORP NEW COM 22160K105 18,390 69,590 SH   SOLE   69,590 0 0
CRISPR THERAPEUTICS AG NAMEN AKT H17182108 1,277 27,112 SH   SOLE   27,112 0 0
DELTA AIR LINES INC DEL COM NEW 247361702 13,089 230,636 SH   SOLE   230,636 0 0
DEXCOM INC COM 252131107 8,016 53,500 SH Put SOLE   53,500 0 0
EDITAS MEDICINE INC COM 28106W103 1,024 41,372 SH   SOLE   41,372 0 0
ENTERCOM COMMUNICATIONS CORP CL A 293639100 2,528 435,860 SH   SOLE   435,860 0 0
EXXON MOBIL CORP COM 30231G102 5,144 67,133 SH   SOLE   67,133 0 0
FIDELITY NATIONAL FINANCIAL FNF GROUP COM 31620R303 14,534 360,641 SH   SOLE   360,641 0 0
G-III APPAREL GROUP LTD COM 36237H101 9,300 316,117 SH   SOLE   316,117 0 0
HERON THERAPEUTICS INC COM 427746102 7,628 410,340 SH   SOLE   410,340 0 0
HOUGHTON MIFFLIN HARCOURT CO COM 44157R109 39,282 6,819,848 SH   SOLE   6,819,848 0 0
INTELLIA THERAPEUTICS INC COM 45826J105 940 57,392 SH   SOLE   57,392 0 0
INVESCO QQQ TR UNIT SER 1 46090E103 29,878 160,000 SH Call SOLE   160,000 0 0
KNIGHT SWIFT TRANSN HLDGS IN CL A 499049104 6,488 197,551 SH   SOLE   197,551 0 0
LAMAR ADVERTISING CO NEW CL A 512816109 14,450 179,039 SH   SOLE   179,039 0 0
LAREDO PETROLEUM INC COM 516806106 8,039 2,772,051 SH   SOLE   2,772,051 0 0
MARATHON PETE CORP COM 56585A102 10,434 186,720 SH   SOLE   186,720 0 0
MICRON TECHNOLOGY INC COM 595112103 5,789 150,000 SH Call SOLE   150,000 0 0
MICRON TECHNOLOGY INC COM 595112103 54,631 1,415,679 SH   SOLE   1,415,679 0 0
NVIDIA CORP COM 67066G104 8,452 51,466 SH   SOLE   51,466 0 0
PRA GROUP INC COM 69354N106 15,044 534,598 SH   SOLE   534,598 0 0
PUBLIC STORAGE COM 74460D109 10,408 43,700 SH Call SOLE   43,700 0 0
PUBLIC STORAGE COM 74460D109 32,153 135,000 SH Put SOLE   135,000 0 0
RANGE RES CORP COM 75281A109 14,152 2,027,472 SH   SOLE   2,027,472 0 0
REGENERON PHARMACEUTICALS COM 75886F107 24,539 78,400 SH Put SOLE   78,400 0 0
REGENXBIO INC COM 75901B107 5,137 100,000 SH Call SOLE   100,000 0 0
REGENXBIO INC COM 75901B107 51,356 999,728 SH   SOLE   999,728 0 0
RYMAN HOSPITALITY PPTYS INC COM 78377T107 41,253 508,731 SH   SOLE   508,731 0 0
SANDERSON FARMS INC COM 800013104 1,625 11,900 SH   SOLE   11,900 0 0
SANGAMO THERAPEUTICS INC COM 800677106 1,247 115,739 SH   SOLE   115,739 0 0
SAREPTA THERAPEUTICS INC COM 803607100 13,402 88,201 SH   SOLE   88,201 0 0
SCHLUMBERGER LTD COM 806857108 5,105 128,457 SH   SOLE   128,457 0 0
SOUTHWEST AIRLS CO COM 844741108 51,014 1,004,609 SH   SOLE   1,004,609 0 0
SPDR GOLD TRUST GOLD SHS 78463V107 6,660 50,000 SH Call SOLE   50,000 0 0
SPDR GOLD TRUST GOLD SHS 78463V107 13,320 100,000 SH Put SOLE   100,000 0 0
SPDR GOLD TRUST GOLD SHS 78463V107 131,930 990,465 SH   SOLE   990,465 0 0
SPDR SERIES TRUST S&P BIOTECH 78464A870 8,771 100,000 SH Put SOLE   100,000 0 0
TJX COS INC NEW COM 872540109 19,975 377,734 SH   SOLE   377,734 0 0
ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 1,449 22,824 SH   SOLE   22,824 0 0
UNION PACIFIC CORP COM 907818108 8,456 50,000 SH Put SOLE   50,000 0 0
URBAN OUTFITTERS INC COM 917047102 6,750 296,682 SH   SOLE   296,682 0 0
WALMART INC COM 931142103 12,020 108,788 SH   SOLE   108,788 0 0
WAVE LIFE SCIENCES LTD SHS Y95308105 1,607 61,585 SH   SOLE   61,585 0 0
WELLS FARGO CO NEW COM 949746101 33,147 700,492 SH   SOLE   700,492 0 0
ZILLOW GROUP INC CL C CAP STK 98954M200 9,278 200,000 SH   SOLE   200,000 0 0