William Marsh Rice University
Long book
$220.6M
Q1 2026
Positions
2
Top-10 weight
100%
concentration
Last quarter
+6.5%
SPY +14.8%
Turnover
0%
of book per quarter
Strategy in plain words
auto-generated from filingsWilliam Marsh Rice University is a wealth-management firm allocating client money, specialised in energy (100% of the long book), running a $220.6M US long book across 2 positions.
The portfolio is extremely concentrated — the top 10 positions are almost the whole book. The book barely moves quarter to quarter — a patient, low-turnover holder. Current anchor positions: VANGUARD S&P 500 ETF, BLACK STONE MINERALS LP.
Over the last 9 quarters its long book ran on average 2.3pp per quarter behind the S&P 500, beating the index in 3 of 9 quarters. Its holdings are mechanical (indexing / client flows), so position changes carry no stock-picking signal.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
+0.3%
Q2 2024
-1.0%
Q3 2024
-0.9%
Q4 2024
+0.2%
Q1 2025
+2.6%
Q2 2025
+5.4%
Q3 2025
+3.1%
Q4 2025
+3.2%
Q1 2026
+6.5%
Sector allocation
Energy 100%
Long book by quarter
What does William Marsh own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| BSM BLACK STONE MINERALS LP | Energy | 5.7M | $85.6M | 38.8% | Held |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 11, 2026 | 2 | $220.6M | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Jan 15, 2026 | 2 | $203.5M | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Oct 31, 2025 | 2 | $145.9M | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Jul 16, 2025 | 2 | $140.4M | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | Apr 15, 2025 | 3 | $236.9M | canonical | SEC ↗ |
| Q4 2024 | 13F-HR/ANEW HOLDINGS | Apr 15, 2025 | 1 | $131.9M | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Jan 13, 2025 | 2 | $83.3M | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Oct 16, 2024 | 2 | $85.8M | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Jul 19, 2024 | 2 | $89.3M | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | Apr 17, 2024 | 1 | $90.5M | canonical | SEC ↗ |
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