SRB Corp.
In its 13F for Q3 2025 (holdings as of September 30, 2025, filed November 14, 2025), SRB Corp. reported 23 stock positions worth $1.7 billion. Its top holding was Microsoft (MSFT) at 20.6% of the portfolio, followed by Safety Insurance (SAFT, 7.5%) and SS Technology Select Sector (XLK, 6.5%). Compared with Q2 2025, it added to 1 and reduced 9. The biggest buy was SS Technology Select Sector (XLK, shares +24%) and the biggest sale WW Grainger (GWW, shares −4%).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0001496228
- Portfolio Value
- $1.7B (Q3 2025)
- SEC Filing
- 0000904454-25-000595 ↗ filed Nov 14, 2025
Holdings Value
Holdings 23 stocks · $1.7B
| MSFT Microsoft Corp. | 20.57% | 692,923 | $358.9M | No change |
| SAFT Safety Insurance Group Inc. | 7.46% | 1,842,284 | $130.2M | No change |
| XLK SS Technology Select Sector | 6.47% | 400,624 | $112.9M | Add +23.6% |
| GE General Electric filed as GE AEROSPACE | 6.38% | 369,895 | $111.3M | Reduce -3.4% |
| RNR Renaissancere Holdings Ltd. | 6.11% | 420,089 | $106.7M | Reduce -0.4% |
| AMZN Amazon.com Inc. | 5.79% | 460,450 | $101.1M | Reduce -6.1% |
| XLC SS Comm Select Sector SPDR | 5.43% | 800,774 | $94.8M | No change |
| XLB SS Materials Select Sector | 4.44% | 864,790 | $77.5M | No change |
| XLV SS Health Care Select Sector | 4.44% | 556,818 | $77.5M | No change |
| WMT Walmart Inc. | 4.29% | 727,050 | $74.9M | Reduce -5.3% |
| INTC Intel Corp. | 4.20% | 2,185,098 | $73.3M | No change |
| GWW WW Grainger Inc. filed as GRAINGER W W INC | 3.73% | 68,199 | $65.0M | Reduce -3.6% |
| TM Toyota Motor Corp. -Spon ADR | 3.26% | 298,092 | $57.0M | Reduce -0.3% |
| GOOGL Alphabet Inc. Class A | 3.26% | 234,211 | $56.9M | No change |
| PG The Procter & Gamble Co. | 2.34% | 265,635 | $40.8M | Reduce -5.4% |
| MRK Merck & Co. Inc. | 2.28% | 473,365 | $39.7M | Reduce -4.7% |
| CVS CVS Health Corp. | 2.28% | 526,855 | $39.7M | Reduce -11.6% |
| SHW The Sherwin-Williams Co. | 2.22% | 112,070 | $38.8M | No change |
| CMCSA Comcast Corp. Class A | 1.81% | 1,007,150 | $31.6M | No change |
| RS Reliance Inc. | 1.58% | 98,231 | $27.6M | No change |
| XLY SS Consumer Disc Select Sect | 1.06% | 77,270 | $18.5M | No change |
| XLI SS Industrial Select Sector | 0.30% | 33,621 | $5.2M | No change |
| XLP SS Consumer Staples Sel Sect | 0.27% | 59,584 | $4.7M | No change |
Portfolio Sells Q2 2025 → Q3 2025
| GWW WW Grainger Inc. | Reduce -3.6% | 3.73% | −0.69 |
| AMZN Amazon.com Inc. | Reduce -6.1% | 5.79% | −0.66 |
| PG The Procter & Gamble Co. | Reduce -5.4% | 2.34% | −0.34 |
| WMT Walmart Inc. | Reduce -5.3% | 4.29% | −0.21 |
| CVS CVS Health Corp. | Reduce -11.6% | 2.28% | −0.19 |
| MRK Merck & Co. Inc. | Reduce -4.7% | 2.28% | −0.08 |
| RNR Renaissancere Holdings Ltd. | Reduce -0.4% | 6.11% | −0.03 |
| TM Toyota Motor Corp. -Spon ADR | Reduce -0.3% | 3.26% | +0.17 |
| GE General Electric | Reduce -3.4% | 6.38% | +0.47 |
Portfolio Buys Q2 2025 → Q3 2025
| XLK SS Technology Select Sector | Add +23.6% | 6.47% | +1.55 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 23 | $1.9B | XLK, MSFT, INTC, SAFT, RNR |
| Q1 2026 | 23 | $1.6B | MSFT, SAFT, RNR, XLK, INTC |
| Q4 2025 | 23 | $1.8B | MSFT, SAFT, XLK, RNR, GE |
| Q3 2025 | 23 | $1.7B | MSFT, SAFT, XLK, GE, RNR |
| Q2 2025 | 23 | $1.7B | MSFT, SAFT, AMZN, RNR, GE |
| Q1 2025 | 23 | $1.5B | MSFT, SAFT, MRK, XLK, RNR |
| Q4 2024 | 23 | $1.7B | MSFT, VGT, SAFT, MRK, RNR |
| Q3 2024 | 18 | $1.8B | MSFT, SAFT, MRK, RNR, INTC |
| Q2 2024 | 19 | $1.7B | MSFT, MRK, SAFT, INTC, RNR |
| Q1 2024 | 75 | $1.8B | MSFT, MRK, SAFT, INTC, RNR |