Mitsui Sumitomo Insurance Co Ltd
Long book
$3.90B
Q1 2026
Positions
1
Top-10 weight
100%
concentration
Last quarter
+9.7%
SPY +14.8%
Turnover
0%
of book per quarter
Strategy in plain words
auto-generated from filingsMitsui Sumitomo Insurance Co Ltd is a diversified fundamental manager, specialised in financials (100% of the long book), running a $3.90B US long book across 1 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: WR BERKLEY CORP.
We rate its filings as signal-bearing: position changes reflect genuine views.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q4 2025
-5.4%
Q1 2026
+9.7%
Sector allocation
Financials 100%
Long book by quarter
What does Mitsui Sumitomo own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| WRB WR BERKLEY CORP | Financials | 58.8M | $3.90B | 100.0% | +16.3% |