SRB Corp.

In its 13F for Q2 2025 (holdings as of June 30, 2025, filed August 14, 2025), SRB Corp. reported 23 stock positions worth $1.7 billion. Its top holding was Microsoft (MSFT) at 20.7% of the portfolio, followed by Safety Insurance (SAFT, 8.8%) and Amazon.com (AMZN, 6.5%). Compared with Q1 2025, it added to 3 and reduced 4. The biggest buy was SS Health Care Select Sector (XLV, shares +850%) and the biggest sale Merck (MRK, shares −60%).

Most Recent 13F
Q2 2026
Location
BOSTON, MA
CIK
0001496228
Portfolio Value
$1.7B (Q2 2025)
SEC Filing
0000904454-25-000420 ↗ filed Aug 14, 2025

Holdings Value

0$500.0M$1.0B$1.5B$2.0B Q1 2024: $1.8B Q1 2024 Q2 2024: $1.7B Q2 2024 Q3 2024: $1.8B Q3 2024 Q4 2024: $1.7B Q4 2024 Q1 2025: $1.5B Q1 2025 Q2 2025: $1.7B $1.7B Q2 2025 Q3 2025: $1.7B Q3 2025 Q4 2025: $1.8B Q4 2025 Q1 2026: $1.6B Q1 2026 Q2 2026: $1.9B Q2 2026

Holdings 23 stocks · $1.7B
MSFT Microsoft Corp. 20.68% 692,923 $344.7M Reduce -0.0%
SAFT Safety Insurance Group Inc. 8.77% 1,842,284 $146.3M No change
AMZN Amazon.com Inc. 6.45% 490,272 $107.6M No change
RNR Renaissancere Holdings Ltd. 6.14% 421,659 $102.4M No change
GE General Electric filed as GE AEROSPACE 5.91% 382,754 $98.5M No change
XLC SS Comm Select Sector SPDR 5.21% 800,774 $86.9M Add +12.1%
XLK SS Technology Select Sector 4.93% 324,185 $82.1M Reduce -36.6%
XLB SS Materials Select Sector 4.56% 864,790 $75.9M Add +18.4%
XLV SS Health Care Select Sector 4.50% 556,818 $75.1M Add +850.4%
WMT Walmart Inc. 4.50% 767,502 $75.0M No change
GWW WW Grainger Inc. filed as GRAINGER W W INC 4.42% 70,760 $73.6M No change
TM Toyota Motor Corp. -Spon ADR 3.09% 298,992 $51.5M No change
INTC Intel Corp. 2.94% 2,185,098 $48.9M No change
PG The Procter & Gamble Co. 2.68% 280,762 $44.7M No change
GOOGL Alphabet Inc. Class A 2.48% 234,211 $41.3M No change
CVS CVS Health Corp. 2.47% 596,193 $41.1M Reduce -12.2%
MRK Merck & Co. Inc. 2.36% 496,546 $39.3M Reduce -60.1%
SHW The Sherwin-Williams Co. 2.31% 112,070 $38.5M No change
CMCSA Comcast Corp. Class A 2.16% 1,007,150 $35.9M No change
RS Reliance Inc. 1.85% 98,231 $30.8M No change
XLY SS Consumer Disc Select Sect 1.01% 77,270 $16.8M No change
XLI SS Industrial Select Sector 0.30% 33,621 $5.0M No change
XLP SS Consumer Staples Sel Sect 0.29% 59,584 $4.8M No change

Portfolio Sells Q1 2025 → Q2 2025
MRK Merck & Co. Inc. Reduce -60.1% 2.36% −4.93
XLK SS Technology Select Sector Reduce -36.6% 4.93% −1.96
CVS CVS Health Corp. Reduce -12.2% 2.47% −0.53
MSFT Microsoft Corp. Reduce -0.0% 20.68% +3.71

Portfolio Buys Q1 2025 → Q2 2025
XLV SS Health Care Select Sector Add +850.4% 4.50% +3.94
XLC SS Comm Select Sector SPDR Add +12.1% 5.21% +0.72
XLB SS Materials Select Sector Add +18.4% 4.56% +0.46

All Filings

QuarterPositions13F Reported ValueTop Holdings
Q2 2026 23$1.9BXLK, MSFT, INTC, SAFT, RNR
Q1 2026 23$1.6BMSFT, SAFT, RNR, XLK, INTC
Q4 2025 23$1.8BMSFT, SAFT, XLK, RNR, GE
Q3 2025 23$1.7BMSFT, SAFT, XLK, GE, RNR
Q2 2025 23$1.7BMSFT, SAFT, AMZN, RNR, GE
Q1 2025 23$1.5BMSFT, SAFT, MRK, XLK, RNR
Q4 2024 23$1.7BMSFT, VGT, SAFT, MRK, RNR
Q3 2024 18$1.8BMSFT, SAFT, MRK, RNR, INTC
Q2 2024 19$1.7BMSFT, MRK, SAFT, INTC, RNR
Q1 2024 75$1.8BMSFT, MRK, SAFT, INTC, RNR