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 FIGI (to the nearest dollar) PRN AMT PRN CALL DISCRETION MANAGER SOLE SHARED NONE
BERKSHIRE HATHAWAY INC DEL CL A 084670108   40,392,252 76 SH   SOLE   76 0 0
BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702   385,330 1,100 SH   SOLE   1,100 0 0
AIRBNB INC COM CL A 009066101   4,869,171 35,487 SH   SOLE   35,487 0 0
COURSERA INC COM 22266M104   265,174 14,188 SH   SOLE   14,188 0 0
DISC MEDICINE INC COM 254604101   3,696,480 78,682 SH   SOLE   78,682 0 0
RAPT THERAPEUTICS INC COM 75382E109   1,219,625 73,383 SH   SOLE   73,383 0 0
ROVER GROUP INC COM CL A 77936F103   272,980 43,607 SH   SOLE   43,607 0 0
SANA BIOTECHNOLOGY INC COM 799566104   380,626 98,353 SH   SOLE   98,353 0 0
SURROZEN INC COM 86889P109   352,285 718,950 SH   SOLE   718,950 0 0
SURROZEN INC *W EXP 08/01/2 86889P117   1,367 33,333 SH   SOLE   33,333 0 0
TENAYA THERAPEUTICS INC COM 87990A106   744,162 291,828 SH   SOLE   291,828 0 0
VIGIL NEUROSCIENCE INC COM 92673K108   1,040,124 192,973 SH   SOLE   192,973 0 0
VOR BIOPHARMA INC COM 929033108   194,849 91,910 SH   SOLE   91,910 0 0
XILIO THERAPEUTICS INC COM 98422T100   526,730 249,635 SH   SOLE   249,635 0 0