MAD RIVER INVESTORS MSB holdings history
MESABI TRUST · CUSIP 590672101 · CIK 1384484
As of 2026-06-30, MAD RIVER INVESTORS reported 323.74K MSB (shares), valued at $8.19M, or 3.06% of its reported non-derivative portfolio. Filed 2026-08-03.
Verify history & sources →Shares increased 0.68%; reported value decreased 19.14%, and weight changed -0.59 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds.
Left: % · Right: Shares · Independently scaled axes
Exact data and methodology
Axes scale independently; a crossing does not mean equal values. Weight uses each quarter's total reported non-derivative value. Same CUSIP; missing quarters are gaps, not zero. Revised history may include later disclosures.
| Quarter | Weight | Quantity | Source |
|---|---|---|---|
| Q2 2026 | 3.06% | 323,735 | SEC filing ↗Filed Aug 3, 2026 |
| Q1 2026 | 3.65% | 321,546 | SEC filing ↗Filed Apr 23, 2026 |
| Q4 2025 | 5.21% | 296,649 | SEC filing ↗Filed Feb 6, 2026 |
| Q3 2025 | 3.71% | 295,523 | SEC filing ↗Filed Oct 14, 2025 |
| Q2 2025 | 3.17% | 295,413 | SEC filing ↗Filed Jul 8, 2025 |
| Q1 2025 | 3.42% | 296,457 | SEC filing ↗Filed Apr 22, 2025 |
| Q4 2024 | 3.85% | 294,901 | SEC filing ↗Filed Jan 16, 2025 |
| Q3 2024 | 3.68% | 293,069 | SEC filing ↗Filed Oct 22, 2024 |
| Q2 2024 | 3.37% | 291,646 | SEC filing ↗Filed Aug 2, 2024 |
| Q1 2024 | 3.51% | 285,837 | SEC filing ↗Filed Apr 19, 2024 |
| Q4 2023 | 4.95% | 260,547 | SEC filing ↗Filed Jan 26, 2024 |
| Q3 2023 | 5.05% | 355,310 | SEC filing ↗Filed Oct 18, 2023 |
History & evidence by quarter
| Quarter | Weight | Quantity | Value | Change explained | Source |
|---|---|---|---|---|---|
| Q3 2023 | 5.05% | 355,310 | $7.13M | The prior quarter is outside the free window. Sign in for the comparison. | SEC filing ↗ Filed Oct 18, 2023 |
| Q4 2023 | 4.95% | 260,547 | $5.33M | Shares decreased 26.67%; reported value decreased 25.21%, and weight changed -0.10 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Jan 26, 2024 |
| Q1 2024 | 3.51% | 285,837 | $5.06M | Shares increased 9.71%; reported value decreased 5.14%, and weight changed -1.44 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Apr 19, 2024 |
| Q2 2024 | 3.37% | 291,646 | $5.03M | Shares increased 2.03%; reported value decreased 0.68%, and weight changed -0.14 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Aug 2, 2024 |
| Q3 2024 | 3.68% | 293,069 | $6.64M | Shares increased 0.49%; reported value increased 32.10%, and weight changed +0.31 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Oct 22, 2024 |
| Q4 2024 | 3.85% | 294,901 | $8.29M | Shares increased 0.63%; reported value increased 24.88%, and weight changed +0.17 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Jan 16, 2025 |
| Q1 2025 | 3.42% | 296,457 | $8.06M | Shares increased 0.53%; reported value decreased 2.73%, and weight changed -0.43 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Apr 22, 2025 |
| Q2 2025 | 3.17% | 295,413 | $7.08M | Shares decreased 0.35%; reported value decreased 12.22%, and weight changed -0.25 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Jul 8, 2025 |
| Q3 2025 | 3.71% | 295,523 | $8.65M | Shares increased 0.04%; reported value increased 22.21%, and weight changed +0.54 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Oct 14, 2025 |
| Q4 2025 | 5.21% | 296,649 | $11.43M | Shares increased 0.38%; reported value increased 32.10%, and weight changed +1.50 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Feb 6, 2026 |
| Q1 2026 | 3.65% | 321,546 | $10.13M | Shares increased 8.39%; reported value decreased 11.36%, and weight changed -1.56 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Apr 23, 2026 |
| Q2 2026 | 3.06% | 323,735 | $8.19M | Shares increased 0.68%; reported value decreased 19.14%, and weight changed -0.59 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Aug 3, 2026 |
Take these holdings further.
This page includes 12 of 12 reported holdings. Sign in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.
- Download CSV
- Earlier quarters
- Advanced screening & filtering
- API & AI access
＋ New accounts get free API credits to explore data beyond ownership filings.
For AI agents & developers
The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account.
Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP.
MCP https://api.akkrudata.ai/mcp
get_institutional_portfolio
{"cik":"1384484","quarter":"2026Q2","cusip":"590672101"}
get_institutional_manager_history
{"cik":"1384484","page_size":100}Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.
- MCP endpoint
- https://api.akkrudata.ai/mcp
- API / MCP documentation
- /documents
- llms.txt
- /llms.txt
Sources, coverage & how to read this data
Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.