0001384484-21-000005.txt : 20210503 0001384484-21-000005.hdr.sgml : 20210503 20210503160545 ACCESSION NUMBER: 0001384484-21-000005 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20210331 FILED AS OF DATE: 20210503 DATE AS OF CHANGE: 20210503 EFFECTIVENESS DATE: 20210503 FILER: COMPANY DATA: COMPANY CONFORMED NAME: MAD RIVER INVESTORS CENTRAL INDEX KEY: 0001384484 IRS NUMBER: 043446822 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 13F-HR SEC ACT: 1934 Act SEC FILE NUMBER: 028-12322 FILM NUMBER: 21883534 BUSINESS ADDRESS: STREET 1: 84 STATE STREET STREET 2: SUITE 1060 CITY: BOSTON STATE: MA ZIP: 02109 BUSINESS PHONE: 617-728-0333 MAIL ADDRESS: STREET 1: 84 STATE STREET STREET 2: SUITE 1060 CITY: BOSTON STATE: MA ZIP: 02109 FORMER COMPANY: FORMER CONFORMED NAME: MRM-Horizon Advisors LLC DATE OF NAME CHANGE: 20061222 13F-HR 1 primary_doc.xml 13F-HR LIVE false false false 0001384484 XXXXXXXX 03-31-2021 03-31-2021 MAD RIVER INVESTORS

84 STATE STREET SUITE 1060 BOSTON MA 02109

13F HOLDINGS REPORT 028-12322 N Stephen C Carluccio 617-728-0333 // Stephen C Carluccio // Boston MA 05-03-2021 0 23 150000 false INFORMATION TABLE 2 1Q21_13F.xml MRMH 1Q21 13F ASSOCIATED CAP GROUP INC CL A 045528106 4541 126625 SH SOLE 0 0 126625 BOEING CO COM 097023105 2254 8850 SH SOLE 0 0 8850 BERKSHIRE HATHAWAY INC DEL CL B NEW 084670702 4123 16139 SH SOLE 0 0 16139 CACI INTL INC CL A 127190304 6186 25080 SH SOLE 0 0 25080 CBOE GLOBAL MKTS INC COM 12503M108 1168 11835 SH SOLE 0 0 11835 CME GROUP INC COM 12572Q105 2185 10699 SH SOLE 0 0 10699 CIVEO CORP CDA COM NEW 17878Y207 5801 378925 SH SOLE 0 0 378925 DISNEY WALT CO COM 254687106 443 2400 SH SOLE 0 0 2400 FRANCO NEV CORP COM 351858105 5020 40065 SH SOLE 0 0 40065 LIBERTY MEDIA CORP DEL COM SER A FRMLA 531229870 521 13635 SH SOLE 0 0 13635 LIBERTY MEDIA CORP DEL COM SER C FRMLA 531229854 1861 42981 SH SOLE 0 0 42981 HOWARD HUGHES CORP COM 44267D107 4527 47586 SH SOLE 0 0 47586 INTERCONTINENTAL EXCHANGE IN COM 45866F104 1522 13625 SH SOLE 0 0 13625 LIBERTY BROADBAND CORP COM SER A 530307107 707 4868 SH SOLE 0 0 4868 LIBERTY BROADBAND CORP COM SER C 530307305 3703 24661 SH SOLE 0 0 24661 LIBERTY MEDIA CORP DEL COM A SIRIUSXM 531229409 508 11520 SH SOLE 0 0 11520 LIBERTY MEDIA CORP DEL COM C SIRIUSXM 531229607 2876 65197 SH SOLE 0 0 65197 MESABI TR CTF BEN INT 590672101 5648 187750 SH SOLE 0 0 187750 NUVEEN AMT FREE QLTY MUN INC COM 670657105 490 33097 SH SOLE 0 0 33097 RLI CORP COM 749607107 781 7000 SH SOLE 0 0 7000 TEXAS PACIFIC LAND CORPORATI COM 88262P102 86570 54466 SH SOLE 0 0 54466 MAMMOTH ENERGY SVCS INC COM 56155L108 57 10700 SH SOLE 0 0 10700 WHEATON PRECIOUS METALS CORP COM 962879102 8508 222677 SH SOLE 0 0 222677