Oriental Harbor Investment Master Fund
Long book
$1.13B
Q1 2026
Positions
12
Top-10 weight
98%
concentration
Last quarter
+26.7%
SPY +14.8%
Turnover
43%
of book per quarter
Strategy in plain words
auto-generated from filingsOriental Harbor Investment Master Fund is a concentrated fundamental stock-picker, specialised in technology (89% of the long book), running a $1.13B US long book across 12 positions.
The portfolio is extremely concentrated — the top 10 positions are almost the whole book. The portfolio is actively managed, with meaningful quarterly turnover. Current anchor positions: ALPHABET INC-CL C, NVIDIA CORP, APPLE INC, PROSHARES ULTRAPRO QQQ, ALPHABET INC-CL A.
Over the last 7 quarters its long book ran on average 2.8pp per quarter ahead of the S&P 500, beating the index in 4 of 7 quarters. We rate its filings highest-signal: new buys here are worth attention.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q3 2024
+9.7%
Q4 2024
-16.6%
Q1 2025
+26.4%
Q2 2025
+16.5%
Q3 2025
+1.0%
Q4 2025
-13.8%
Q1 2026
+26.7%
Sector allocation
Technology 88%
Industrials 8%
Consumer discretionary 4%
Financials 0%
Long book by quarter
What does Oriental Harbor own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| GOOG ALPHABET INC-CL C | Technology | 1.2M | $345.6M | 30.5% | -6.8% |
| NVDA NVIDIA CORP | Technology | 1.3M | $224.2M | 19.8% | +1.1% |
| AAPL APPLE INC | Technology | 344.3K | $87.4M | 7.7% | +0.8% |
| GOOGL ALPHABET INC-CL A | Technology | 277.1K | $79.7M | 7.0% | New |
| META META PLATFORMS INC-CLASS A | Technology | 136.8K | $78.3M | 6.9% | -0.1% |
| TSLA TESLA INC | Industrials | 199.4K | $74.1M | 6.5% | +0.8% |
| AMZN AMAZON.COM INC | Consumer discretionary | 181.5K | $37.8M | 3.3% | -1.2% |
| MU MICRON TECHNOLOGY INC | Technology | 73.0K | $24.7M | 2.2% | New |
| CRCL CIRCLE INTERNET GROUP INC | Financials | 31.7K | $3.0M | 0.3% | New |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | Apr 28, 2026 | 12 | $1.13B | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Jan 27, 2026 | 10 | $1.32B | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Oct 14, 2025 | 17 | $1.29B | canonical | SEC ↗ |
| Q2 2025 | 13F-HR/ARESTATEMENT | Jul 29, 2025 | 13 | $1.13B | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Jul 21, 2025 | 17 | $1.61B | SEC ↗ | |
| Q1 2025 | 13F-HR | May 19, 2025 | 10 | $867.9M | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Jan 8, 2025 | 14 | $994.8M | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Dec 3, 2024 | 1 | $968.8M | canonical | SEC ↗ |