MAD RIVER INVESTORS

CIK 0001384484 · BOSTON, MA · Quarter end: 2026-06-30 · Filed on: 2026-08-03 · Open the SEC source

MAD RIVER INVESTORS reported 30 positions worth $268.1M as of June 30, 2026 (13F filed August 3, 2026). Largest holding: TPL (46.6%).

Portfolio Value (AUM)Total value of the fund's US stock portfolio reported to the SEC.
$268.1M
2026 Q2
Positions
30
Top-10 ConcentrationHow much of the portfolio sits in the 10 largest holdings. High = concentrated bets.
91.3%
Est. Net Flow (Q)
2026 Q2
10 / 30 positions shown
#SymbolCompanyTypeValue% Port.Shares1YYTD
1TPLTEXAS PACIFIC LAND CORPORATISH$124.9M46.58%285,330
2PBTPERMIAN BASIN RTY TRSH$25.2M9.39%1,005,152
3LBLANDBRIDGE COMPANY LLCSH$21.2M7.92%267,953
4HEHAWAIIAN ELEC INDS INC MTN BSH$17.9M6.67%1,321,850
5GBTCGRAYSCALE BITCOIN TRUST ETFSH$16.4M6.11%360,139
6MIAXMIAMI INTL HLDGS INCSH$10.7M4.01%289,000
7WBIWATERBRIDGE INFRASTRUCTURE LSH$9.2M3.42%267,801
8MSBMESABI TRSH$8.2M3.05%323,735
9WPMWHEATON PRECIOUS METALS CORPSH$6.3M2.35%56,173
10FNVFRANCO NEV CORPSH$4.7M1.75%22,506

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Read the 2026-Q2 quarterly report · 13F Filing Calendar

Frequently Asked Questions

What stocks does MAD RIVER INVESTORS hold as of Q2 2026?

MAD RIVER INVESTORS reported 30 positions worth $268.1M in its Q2 2026 13F filing. Largest positions: TPL (46.6%), PBT (9.4%), LB (7.9%), HE (6.7%) and GBTC (6.1%).

What did MAD RIVER INVESTORS buy in Q2 2026?

No previous quarter is available yet; the comparison appears with the next filing.

What did MAD RIVER INVESTORS sell in Q2 2026?

No previous quarter is available yet.

13F data shows quarter-end positions, is delayed by up to 45 days and covers only long positions in US-listed securities; short positions, most derivatives and non-US assets are not reported.