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
Aspen Aerogels Common 04523Y105 15,520 3,167,322 SH   SOLE n/a 3,167,322 0 0
BOK Financial Common 05561Q201 264,145 2,809,755 SH   SOLE n/a 2,809,755 0 0
Allergan PLC Common G0177J108 897 5,378 SH   OTR n/a 0 0 5,378
Alphabet Inc Class C Common 02079K107 1,813 1,625 SH   OTR n/a 0 0 1,625
Berkshire Hathaway Inc. - CL B Common 084670702 3,069 16,443 SH   OTR n/a 0 0 16,443
Boston Omaha Corp - CL A Common 101044105 601 28,530 SH   OTR n/a 0 0 28,530
Cimpress N.V. Common N20146101 1,901 13,116 SH   OTR n/a 0 0 13,116
Comcast Corp New - CL A Common 20030N101 1,177 35,875 SH   OTR n/a 0 0 35,875
Costco Wholesale Corp Common 22160K105 927 4,434 SH   OTR n/a 0 0 4,434
JPMorgan Chase & Co Common 46625H100 3,653 35,056 SH   OTR n/a 0 0 35,056
Liberty Broadband Corp Common 530307305 2,768 36,557 SH   OTR n/a 0 0 36,557
Liberty Media Corp Series C Sirius XM Group Common 531229607 1,635 36,034 SH   OTR n/a 0 0 36,034
Microsoft Corp Common 594918104 2,710 27,481 SH   OTR n/a 0 0 27,481
Moodys Corp Common 615369105 1,566 9,181 SH   OTR n/a 0 0 9,181
S&P Global Inc. Common 78409V104 2,074 10,170 SH   OTR n/a 0 0 10,170
Starbucks Corp Common 855244109 1,145 23,444 SH   OTR n/a 0 0 23,444
TripAdvisor Inc Common 896945201 1,232 22,119 SH   OTR n/a 0 0 22,119