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SRB CORP — 13F Holdings & Portfolio

CIK 1496228 · latest 13F-HR filed 2026-08-14

Backtest portfolio

SRB CORP manages $1.86B in 13F-reported U.S. long-equity assets across 46 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are XLK (8.32%), MSFT (6.43%), RNR (5.30%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 0 new positions, exited 0, added to 14, and trimmed 5.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

Filer Information
Address
695 ATLANTIC AVENUE
BOSTON, MA 02111
Phone
(617) 457-7527
Filing Manager
SRB CORP
BOSTON, MA
Signatory
Frederick C. Childs
Vice President
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AUM

$1.86B

Long-equity book

Holdings

46

Distinct positions

Period

2026-06-30

Filed 2026-08-14

Q/Q Activity

+0 / −0 / ↑14 / ↓5

vs 2026-03-31

Firm Profile & Key People
Name Title / Status Ownership Type

Top Adds (vs prior quarter)

  • SELECT SECTOR SPDR TR$115.3M +101.6%
  • INTEL CORP$54.3M +57.3%
  • SELECT SECTOR SPDR TR$52.1M +958.0%
  • SELECT SECTOR SPDR TR$35.7M +731.3%
  • WW GRAINGER INC$18.0M +24.7%
Show all 14 →

Top Trims

  • WALMART INC-$54.2M -70.3%
  • GE AEROSPACE-$40.6M -47.5%
  • TOYOTA MOTOR CORP-$11.0M -18.3%
  • PROCTER & GAMBLE CO-$9.4M -27.9%
  • COMCAST CORP NEW-$4.6M -14.5%
Show all 5 →

New Positions

  • No new positions this quarter.
Show all 0 →

Exited Positions

  • No exits this quarter.
Show all 0 →
All Holdings

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 SELECT SECTOR SPDR TR XLK 81369Y803 $154.6M 8.32% 811,492 SH
2 MICROSOFT CORP MSFT 594918104 $119.5M 6.43% 320,422 SH
3 RENAISSANCERE HLDGS LTD RNR G7496G103 $98.5M 5.30% 310,668 SH
4 INTEL CORP INTC 458140100 $92.6M 4.98% 663,227 SH
5 MICROSOFT CORP MSFT 594918104 $92.5M 4.97% 247,966 SH
6 SAFETY INS GROUP INC SAFT 78648T100 $76.2M 4.10% 1,017,679 SH
7 SELECT SECTOR SPDR TR XLK 81369Y803 $74.1M 3.99% 388,939 SH
8 SAFETY INS GROUP INC SAFT 78648T100 $58.2M 3.13% 776,976 SH
9 INTEL CORP INTC 458140100 $56.4M 3.04% 404,180 SH
10 AMAZON COM INC AMZN 023135106 $56.1M 3.02% 235,462 SH
11 SELECT SECTOR SPDR TR XLV 81369Y209 $52.7M 2.83% 332,074 SH
12 AMAZON COM INC AMZN 023135106 $51.2M 2.76% 214,972 SH
13 WW GRAINGER INC GWW 384802104 $49.0M 2.64% 36,042 SH
14 SELECT SECTOR SPDR TR XLB 81369Y100 $47.0M 2.53% 925,356 SH
15 SELECT SECTOR SPDR TR XLC 81369Y852 $45.9M 2.47% 428,427 SH
16 ALPHABET INC GOOGL 02079K305 $43.5M 2.34% 121,774 SH
17 WW GRAINGER INC GWW 384802104 $41.9M 2.25% 30,819 SH
18 CVS HEALTH CORP CVS 126650100 $41.0M 2.21% 396,796 SH
19 SELECT SECTOR SPDR TR XLB 81369Y100 $40.9M 2.20% 804,224 SH
20 SELECT SECTOR SPDR TR XLC 81369Y852 $39.9M 2.15% 372,347 SH
21 ALPHABET INC GOOGL 02079K305 $38.3M 2.06% 107,094 SH
22 SELECT SECTOR SPDR TR XLV 81369Y209 $35.7M 1.92% 224,744 SH
23 SELECT SECTOR SPDR TR XLI 81369Y704 $31.4M 1.69% 169,498 SH
24 MERCK & CO INC MRK 58933Y105 $30.2M 1.62% 234,641 SH
25 MERCK & CO INC MRK 58933Y105 $29.4M 1.58% 228,657 SH
26 SELECT SECTOR SPDR TR XLI 81369Y704 $26.1M 1.41% 141,085 SH
27 TOYOTA MOTOR CORP TM 892331307 $24.8M 1.33% 147,113 SH
28 RENAISSANCERE HLDGS LTD RNR G7496G103 $24.7M 1.33% 77,810 SH
29 TOYOTA MOTOR CORP TM 892331307 $24.3M 1.31% 144,576 SH
30 GE AEROSPACE GE 369604301 $23.5M 1.26% 62,811 SH
31 RELIANCE INC RS 759509102 $21.4M 1.15% 57,290 SH
32 GE AEROSPACE GE 369604301 $21.3M 1.15% 57,114 SH
33 COMCAST CORP NEW CMCSA 20030N101 $21.3M 1.14% 866,233 SH
34 SELECT SECTOR SPDR TR XLP 81369Y308 $21.2M 1.14% 254,919 SH
35 SHERWIN WILLIAMS CO SHW 824348106 $20.3M 1.09% 58,864 SH
36 SELECT SECTOR SPDR TR XLP 81369Y308 $19.4M 1.05% 233,912 SH
37 SHERWIN WILLIAMS CO SHW 824348106 $17.6M 0.95% 51,177 SH
38 RELIANCE INC RS 759509102 $14.5M 0.78% 38,686 SH
39 SELECT SECTOR SPDR TR XLY 81369Y407 $13.0M 0.70% 110,760 SH
40 PROCTER & GAMBLE CO PG 742718109 $12.3M 0.66% 83,704 SH
41 PROCTER & GAMBLE CO PG 742718109 $12.0M 0.64% 81,698 SH
42 WALMART INC WMT 931142103 $11.6M 0.62% 102,295 SH
43 WALMART INC WMT 931142103 $11.3M 0.61% 99,953 SH
44 CVS HEALTH CORP CVS 126650100 $11.3M 0.61% 109,220 SH
45 COMCAST CORP NEW CMCSA 20030N101 $5.7M 0.30% 230,452 SH
46 SELECT SECTOR SPDR TR XLY 81369Y407 $5.1M 0.28% 43,780 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $1.86B 46 0000904454-26-000456
2026-03-31 2026-05-14 $1.63B 44 0000904454-26-000289
2025-12-31 2026-02-13 $1.82B 44 0000904454-26-000102
2025-09-30 2025-11-14 $1.74B 44 0000904454-25-000595