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 1,091 148,254 SH   SOLE   148,254 0 0
ADAPTIMMUNE THERAPEUTICS PLC SPONDS ADR 00653A107 798 185,537 SH   SOLE   185,537 0 0
ADVERUM BIOTECHNOLOGIES INC COM 00773U108 4,657 888,722 SH   SOLE   888,722 0 0
ALIBABA GROUP HLDG LTD SPONSORED ADS 01609W102 18,245 100,000 SH Put SOLE   100,000 0 0
ALLEGHENY TECHNOLOGIES INC COM 01741R102 59,434 2,324,379 SH   SOLE   2,324,379 0 0
ALPHABET INC CAP STK CL A 02079K305 81,994 69,670 SH   SOLE   69,670 0 0
AMAZON COM INC COM 023135106 9,399 5,278 SH   SOLE   5,278 0 0
AMYRIS INC COM NEW 03236M200 1,150 550,319 SH   SOLE   550,319 0 0
APPLE INC COM 037833100 30,120 158,568 SH   SOLE   158,568 0 0
ASA GOLD AND PRECIOUS MTLS L SHS G3156P103 7,286 710,791 SH   SOLE   710,791 0 0
AUDENTES THERAPEUTICS INC COM 05070R104 5,620 144,022 SH   SOLE   144,022 0 0
AUTONATION INC COM 05329W102 10,210 285,823 SH   SOLE   285,823 0 0
BERKSHIRE HATHAWAY INC DEL CL A 084670108 437,063 1,451 SH   SOLE   1,451 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 44,414 221,086 SH   SOLE   221,086 0 0
BIOMARIN PHARMACEUTICAL INC COM 09061G101 4,463 50,242 SH   SOLE   50,242 0 0
BLACK KNIGHT INC COM 09215C105 5,317 97,567 SH   SOLE   97,567 0 0
BLUEBIRD BIO INC COM 09609G100 2,834 18,015 SH   SOLE   18,015 0 0
CARMAX INC COM 143130102 37,513 537,441 SH   SOLE   537,441 0 0
CARVANA CO CL A 146869102 49,529 853,067 SH   SOLE   853,067 0 0
CELLECTIS S A SPONSORED ADS 15117K103 1,500 81,772 SH   SOLE   81,772 0 0
CHIPOTLE MEXICAN GRILL INC COM 169656105 30,041 42,293 SH   SOLE   42,293 0 0
CONOCOPHILLIPS COM 20825C104 17,926 268,601 SH   SOLE   268,601 0 0
COSTCO WHSL CORP NEW COM 22160K105 18,889 78,010 SH   SOLE   78,010 0 0
CRISPR THERAPEUTICS AG NAMEN AKT H17182108 1,083 30,316 SH   SOLE   30,316 0 0
DELTA AIR LINES INC DEL COM NEW 247361702 12,231 236,812 SH   SOLE   236,812 0 0
DEXCOM INC COM 252131107 5,955 50,000 SH Put SOLE   50,000 0 0
EDITAS MEDICINE INC COM 28106W103 1,131 46,270 SH   SOLE   46,270 0 0
ENTERCOM COMMUNICATIONS CORP CL A 293639100 2,347 446,981 SH   SOLE   446,981 0 0
ENTERPRISE PRODS PARTNERS L COM 293792107 5,820 200,000 SH Call SOLE   200,000 0 0
EXXON MOBIL CORP COM 30231G102 5,789 71,641 SH   SOLE   71,641 0 0
FIAT CHRYSLER AUTOMOBILES N SHS N31738102 8,037 541,211 SH   SOLE   541,211 0 0
FIDELITY NATIONAL FINANCIAL FNF GROUP COM 31620R303 14,535 397,671 SH   SOLE   397,671 0 0
G-III APPAREL GROUP LTD COM 36237H101 13,597 340,257 SH   SOLE   340,257 0 0
GRUBHUB INC COM 400110102 3,126 45,000 SH Put SOLE   45,000 0 0
HERON THERAPEUTICS INC COM 427746102 11,174 457,203 SH   SOLE   457,203 0 0
HOUGHTON MIFFLIN HARCOURT CO COM 44157R109 60,079 8,263,967 SH   SOLE   8,263,967 0 0
INTELLIA THERAPEUTICS INC COM 45826J105 1,096 64,168 SH   SOLE   64,168 0 0
JETBLUE AWYS CORP COM 477143101 8,618 526,762 SH   SOLE   526,762 0 0
KNIGHT SWIFT TRANSN HLDGS IN CL A 499049104 7,199 220,276 SH   SOLE   220,276 0 0
LAMAR ADVERTISING CO NEW CL A 512816109 15,422 194,572 SH   SOLE   194,572 0 0
LAREDO PETROLEUM INC COM 516806106 10,991 3,556,896 SH   SOLE   3,556,896 0 0
MARATHON PETE CORP COM 56585A102 11,922 199,202 SH   SOLE   199,202 0 0
MICRON TECHNOLOGY INC COM 595112103 12,399 300,000 SH Call SOLE   300,000 0 0
MICRON TECHNOLOGY INC COM 595112103 12,399 300,000 SH Put SOLE   300,000 0 0
MICRON TECHNOLOGY INC COM 595112103 81,651 1,975,581 SH   SOLE   1,975,581 0 0
PRA GROUP INC COM 69354N106 15,703 585,731 SH   SOLE   585,731 0 0
RANGE RES CORP COM 75281A109 26,276 2,337,714 SH   SOLE   2,337,714 0 0
REGENERON PHARMACEUTICALS COM 75886F107 36,997 90,100 SH Put SOLE   90,100 0 0
REGENXBIO INC COM 75901B107 2,040 35,600 SH Call SOLE   35,600 0 0
REGENXBIO INC COM 75901B107 57,067 995,760 SH   SOLE   995,760 0 0
RYMAN HOSPITALITY PPTYS INC COM 78377T107 47,812 581,375 SH   SOLE   581,375 0 0
SANDERSON FARMS INC COM 800013104 16,997 128,919 SH   SOLE   128,919 0 0
SANGAMO THERAPEUTICS INC COM 800677106 1,234 129,372 SH   SOLE   129,372 0 0
SAREPTA THERAPEUTICS INC COM 803607100 12,505 104,917 SH   SOLE   104,917 0 0
SCHLUMBERGER LTD COM 806857108 6,194 142,159 SH   SOLE   142,159 0 0
SOUTHWEST AIRLS CO COM 844741108 58,154 1,120,286 SH   SOLE   1,120,286 0 0
SPDR GOLD TRUST GOLD SHS 78463V107 78,390 642,488 SH   SOLE   642,488 0 0
SPDR SERIES TRUST S&P BIOTECH 78464A870 13,581 150,000 SH Put SOLE   150,000 0 0
TJX COS INC NEW COM 872540109 22,468 422,254 SH   SOLE   422,254 0 0
ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 1,771 25,528 SH   SOLE   25,528 0 0
UNIQURE NV SHS N90064101 3,597 60,304 SH   SOLE   60,304 0 0
URBAN OUTFITTERS INC COM 917047102 8,997 303,534 SH   SOLE   303,534 0 0
WALMART INC COM 931142103 12,067 123,722 SH   SOLE   123,722 0 0
WAVE LIFE SCIENCES LTD SHS Y95308105 2,680 68,977 SH   SOLE   68,977 0 0
WELLS FARGO CO NEW COM 949746101 40,289 833,793 SH   SOLE   833,793 0 0