account_balance
Investment manager · 13F filer · SEC CIK 1384484
Mad River Investors
Reported value$245Mas of Sep 30, 2026
Positions30 2 new, 1 sold out
Top 10 weight88.9%TPL alone is 38%
FiledOct 2727 days after quarter end
Portfolio · as of Sep 30, 2026
Where the money is
The top 10 stocks are 88.9% of this fund. 20 other stocks make up the rest.
TPL Texas Pacific Land Corporati 37.8% HeldPBT Permian Basin Rty Tr 13.6% Added +5%GBTC Grayscale Bitcoin Trust ETF 9.4% HeldLB Landbridge Company LLC 8.8% HeldHE Hawaiian Elec Inds Inc MTN B 4.8% HeldMIAX Miami Intl Hldgs Inc 4.1% Added +3%WBI Waterbridge Infrastructure L 3.1% HeldMSB Mesabi Tr 2.6% HeldWPM Wheaton Precious Metals Corp 2.5% Trimmed −20%FBTC Fidelity Wise Origin Bitcoin 2.3% Added +11%
20 other stocks11.1%
Bar length compares each stock with the biggest holding. Tags compare share counts with the Jun 30, 2026 filing. 13F only covers US-listed stocks, so foreign holdings and short positions are missing.
What changed