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SRB Corp
Insurance Manager
SRB Corp is an Insurance Manager based in Boston, MA led by William Daniel Hartranft, reporting $4.2B in AUM as of Q3 2025 with 71% concentrated in top 10 holdings and 21% allocation to MSFT.
DirectorWilliam Daniel Hartranft
- Portfolio Value
- $1.7B
- Positions
- 23
- Top Holding
- MSFT at 20.57%
- Last Reported
- Q3 2025
Top Holdings
Largest long holdings in SRB Corp's portfolio (71.4% of total portfolio)
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| Holding | Sector | Position | Weight | Traded | Ownership |
|---|---|---|---|---|---|
Software - Infrastructure Technology | $358.9M | 20.57% | — | 0.01% 692.9K shares | |
Insurance - Property & Casualty Financial Services | $130.2M | 7.46% | — | 12.37% 1.8M shares | |
ETF ETF | $112.9M | 6.47% | +$21.5M Bought | — 400.6K shares | |
Aerospace & Defense Industrials | $111.3M | 6.38% | -$3.9M Sold | 0.03% 369.9K shares | |
Insurance - Reinsurance Financial Services | $106.7M | 6.11% | -$398.7K Sold | 0.89% 420.1K shares | |
Specialty Retail Consumer Cyclical | $101.1M | 5.79% | -$6.5M Sold | 0.00% 460.5K shares | |
ETF ETF | $94.8M | 5.43% | — | — 800.8K shares | |
ETF ETF | $77.5M | 4.44% | — | — 864.8K shares | |
ETF ETF | $77.5M | 4.44% | — | — 556.8K shares | |
Discount Stores Consumer Defensive | $74.9M | 4.29% | -$4.2M Sold | 0.01% 727.1K shares |
Changes
Portfolio activity, position movements, and quarter-over-quarter changes in SRB Corp's latest filing
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Market Value
Q/Q Change
Net Flows % of MV
Turnover Ratio
New Purchases
Added To
Sold Out Of
Reduced Holdings
Increased Positions
| Position | Shares Δ |
|---|---|
+23.58% |
Decreased Positions
| Position | Shares Δ |
|---|---|
-11.63% | |
-6.08% | |
-5.39% | |
-5.27% | |
-4.67% |
Analytics
Portfolio insights and performance metrics for SRB Corp
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