MRM-Horizon Advisors
Latest statistics and disclosures from Mad River Investors's latest quarterly 13F-HR filing:
- Top 5 stock holdings are TPL, PBT, LB, HE, GBTC, and represent 76.91% of Mad River Investors's stock portfolio.
- Added to shares of these 10 stocks: MIAX (+$7.7M), CCL, FRMI, LB, TPL, HE, MSB, PBT, ICE, BTC.
- Started 2 new stock positions in FRMI, CCL.
- Reduced shares in these 10 stocks: Carnival Corporation, WPM, VTI, RGLD, , FNV, VIG, CACI, WBI, BRK.B.
- Sold out of its positions in Carnival Corporation, JPM, RGLD, VIG.
- Mad River Investors was a net buyer of stock by $658k.
- Mad River Investors has $268M in assets under management (AUM), dropping by -3.51%.
- Central Index Key (CIK): 0001384484
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Portfolio Holdings for Mad River Investors
Mad River Investors holds 29 positions in its portfolio as reported in the June 2026 quarterly 13F filing
| Company (Ticker) | Portfolio Weight | Valued At | Change in Shares | Share Count | Share Price | |
|---|---|---|---|---|---|---|
| Texas Pacific Land Corp (TPL) | 46.6 | $125M | 285k | 437.64 |
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| Permian Basin Rty Tr Unit Ben Int (PBT) | 9.4 | $25M | 1.0M | 25.04 |
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| Landbridge Company Cl A (LB) | 7.9 | $21M | 268k | 79.24 |
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| Hawaiian Elec Inds Inc Mtn B Call Call Option (Principal) (HE) | 6.9 | $19M | 1.4M | 13.53 |
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| Grayscale Bitcoin Trust Etf Shs Rep Com Ut (GBTC) | 6.1 | $16M | 360k | 45.52 |
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| Miami Intl Hldgs (MIAX) | 4.0 | $11M | +255% | 289k | 37.16 |
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| Waterbridge Infrastructure L Cl A Shs Repstg (WBI) | 3.4 | $9.2M | 268k | 34.27 |
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| Mesabi Tr Ctf Ben Int (MSB) | 3.1 | $8.2M | 324k | 25.30 |
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| Wheaton Precious Metals Corp (WPM) | 2.4 | $6.3M | -37% | 56k | 112.32 |
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| Franco-Nevada Corporation (FNV) | 1.7 | $4.7M | -4% | 23k | 208.44 |
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| Fidelity Wise Origin Bitcoin SHS (FBTC) | 1.3 | $3.6M | 70k | 51.05 |
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| Carnival Corp Common Shares (CCL) | 1.0 | $2.7M | NEW | 95k | 28.57 |
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| Vanguard Index Fds Total Stk Mkt (VTI) | 0.9 | $2.5M | -22% | 6.8k | 370.04 |
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| Grayscale Bitcoin Mini Tr Et Shs New (BTC) | 0.8 | $2.1M | 82k | 25.95 |
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| Palo Alto Networks (PANW) | 0.7 | $1.9M | 5.5k | 341.02 |
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| CBOE Holdings (CBOE) | 0.6 | $1.6M | 6.7k | 242.66 |
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| Apple (AAPL) | 0.5 | $1.5M | 5.1k | 289.36 |
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| Oracle Corporation (ORCL) | 0.4 | $1.2M | 8.1k | 146.55 |
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| Intercontinental Exchange (ICE) | 0.4 | $966k | +2% | 7.8k | 123.10 |
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| Amazon (AMZN) | 0.3 | $810k | -2% | 3.4k | 238.34 |
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| UnitedHealth (UNH) | 0.3 | $707k | 1.7k | 415.63 |
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| Cisco Systems (CSCO) | 0.3 | $705k | 6.0k | 117.46 |
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| Cincinnati Financial Corporation (CINF) | 0.2 | $667k | 3.6k | 185.14 |
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| Eaton Corp SHS (ETN) | 0.2 | $511k | 1.2k | 426.12 |
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| Rli (RLI) | 0.1 | $354k | 6.0k | 59.07 |
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| Berkshire Hathaway Inc Del Cl B New (BRK.B) | 0.1 | $313k | -24% | 625.00 | 500.39 |
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| Johnson & Johnson (JNJ) | 0.1 | $305k | 1.2k | 253.97 |
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| Caci Intl Cl A (CACI) | 0.1 | $211k | -43% | 455.00 | 463.26 |
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| Fermi (FRMI) | 0.1 | $151k | NEW | 17k | 9.16 |
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Past Filings by Mad River Investors
SEC 13F filings are viewable for Mad River Investors going back to 2010
- Mad River Investors 2026 Q2 filed Aug. 3, 2026
- Mad River Investors 2026 Q1 filed April 23, 2026
- Mad River Investors 2025 Q4 filed Feb. 6, 2026
- Mad River Investors 2025 Q3 filed Oct. 14, 2025
- Mad River Investors 2025 Q2 filed July 8, 2025
- Mad River Investors 2025 Q1 filed April 22, 2025
- Mad River Investors 2024 Q4 filed Jan. 16, 2025
- Mad River Investors 2024 Q3 filed Oct. 22, 2024
- Mad River Investors 2024 Q2 filed Aug. 2, 2024
- Mad River Investors 2024 Q1 filed April 19, 2024
- Mad River Investors 2023 Q4 filed Jan. 26, 2024
- Mad River Investors 2023 Q3 filed Oct. 18, 2023
- Mad River Investors 2023 Q2 filed Aug. 3, 2023
- Mad River Investors 2023 Q1 filed May 4, 2023
- Mad River Investors 2022 Q4 filed Feb. 6, 2023
- Mad River Investors 2022 Q3 filed Oct. 26, 2022