UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F COVER PAGE
OMB APPROVAL
OMB Number:3235-0006
Expires:July 31, 2015
Estimated average burden
hours per response:23.8
Report for the Calendar Year or Quarter Ended:
06-30-2019
Check here if Amendment: ☐ Amendment Number:
This Amendment (Check only one.):☐ is a restatement.
☐ adds new holdings entries.

Institutional Investment Manager Filing this Report:

Name:
MAD RIVER INVESTORS
Address:
84 STATE STREET
SUITE 1060
BOSTON, MA 02109
Form 13F File Number:
028-12322

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.


Person Signing this Report on Behalf of Reporting Manager:
Name:
Stephen C. Carluccio
Title:
Chief Compliance Officer
Phone:
617-728-0333


Signature, Place, and Date of Signing:

/Stephen C Carluccio/
                         [Signature]
Boston, MASSACHUSETTS
                 [City, State]
08-07-2019
                           [Date]
                          

Report Type (Check only one.):

☒ 13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.) 

☐ 13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).) 

☐ 13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)


Form 13F Summary Page

Report Summary:

Number of Other Included Managers:
0
Form 13F Information table Entry Total:
28
Form 13F Information table Value Total:
114150
          (thousands)

List of Other Included Managers:

Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report.
[If there are no entries in this list, state "NONE" and omit the column headings and list entries.]

  
NONE


UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F INFORMATION TABLE
OMB APPROVAL
OMB Number:3235-0006
Expires:July 31, 2015
Estimated average burden
hours per response:23.8
COLUMN 1COLUMN 2COLUMN 3COLUMN 4COLUMN 5COLUMN 6COLUMN 7COLUMN 8
VALUESHRS ORSH/PUT/INVESTMENTOTHERVOTING AUTHORITY
NAME OF ISSUERTITLE OF CLASSCUSIP(x$1000)PRN AMTPRNCALLDISCRETIONMANAGERSOLESHAREDNONE
3M COCOM88579Y1012891,670SHSOLE0324 0 1,346
ASSOCIATED CAP GROUP INCCL A0455281065,274141,025SHSOLE083,175 0 57,850
BERKSHIRE HATHAWAY INC DELCL B0846707025,16024,204SHSOLE019,111 0 5,093
BROOKFIELD ASSET MGMT INCCL A1125851042,40950,428SHSOLE041,921 0 8,507
CACI INTL INCCL A1271903042,25911,044SHSOLE06,759 0 4,285
CBOE GLOBAL MARKETS INCCOM12503M1081,48614,340SHSOLE08,520 0 5,820
CIVEO CORP CDACOM17878Y1086,0943,543,267SHSOLE02,177,367 0 1,365,900
CME GROUP INCCOM12572Q1052,16611,157SHSOLE06,527 0 4,630
DISH NETWORK CORPCL A25470M10982121,373SHSOLE013,461 0 7,912
DISNEY WALT COCOM2546871063352,400SHSOLE02,400 0 0
ECHOSTAR CORPCL A2787681061,04723,617SHSOLE013,867 0 9,750
FRANCO NEVADA CORPCOM3518581051,80821,300SHSOLE012,825 0 8,475
GCI LIBERTY INCCOM CLASS A36164V3054,75577,365SHSOLE041,670 0 35,695
HOWARD HUGHES CORPCOM44267D10710,20382,392SHSOLE043,649 0 38,743
LIBERTY BROADBAND CORPCOM SER A5303071071,54715,043SHSOLE08,703 0 6,340
LIBERTY BROADBAND CORPCOM SER C5303073054,68944,994SHSOLE026,830 0 18,164
LIBERTY MEDIA CORP DELAWARECOM SER A FRMLA53122987056815,838SHSOLE09,282 0 6,556
LIBERTY MEDIA CORP DELAWARECOM SER C FRMLA5312298541,74346,589SHSOLE028,622 0 17,967
LIBERTY MEDIA CORP DELAWARECOM A SIRIUSXM5312294092,37262,743SHSOLE037,188 0 25,555
LIBERTY MEDIA CORP DELAWARECOM C SIRIUSXM5312296075,153135,668SHSOLE081,130 0 54,538
LIONS GATE ENTMNT CORPCL B NON VTG53591950030025,874SHSOLE016,548 0 9,326
NAVIGATOR HOLDINGS LTDSHSY6213210835037,367SHSOLE025,267 0 12,100
NUVEEN AMT FREE QLTY MUN INCCOM67065710545733,097SHSOLE0 0 0 33,097
PINGTAN MARINE ENTERPRISE LTSHSG7114V10213949,769SHSOLE0 0 0 49,769
RLI CORPCOM7496071071,33915,620SHSOLE07,810 0 7,810
TEXAS PAC LD TRSUB CTF PROP I T88261010844,95357,120SHSOLE036,812 0 20,308
UNITEDHEALTH GROUP INCCOM91324P1023291,350SHSOLE0600 0 750
WHEATON PRECIOUS METALS CORPCOM9628791026,105252,467SHSOLE0153,442 0 99,025