SRB CORP — 13F Holdings & Portfolio
CIK 1496228 · latest 13F-HR filed 2026-05-14
SRB CORP manages $1.63B in 13F-reported U.S. long-equity assets across 44 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are MSFT (7.28%), MSFT (5.80%), RNR (5.67%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 0 new positions, exited 0, added to 5, and trimmed 12.
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.
$1.63B
Long-equity book
44
Distinct positions
2026-03-31
Filed 2026-05-14
+0 / −0 / ↑5 / ↓12
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- INTEL CORP$14.1M +17.5%
- SELECT SECTOR SPDR TR$8.0M +10.2%
- MERCK & CO INC$5.9M +11.8%
- WW GRAINGER INC$4.1M +6.0%
- SELECT SECTOR SPDR TR$256.2K +5.5%
Top Trims
- MICROSOFT CORP-$122.1M -36.4%
- GE AEROSPACE-$28.5M -25.1%
- SAFETY INS GROUP INC-$13.2M -9.2%
- AMAZON COM INC-$12.5M -11.7%
- SELECT SECTOR SPDR TR-$9.4M -7.7%
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 | MICROSOFT CORP | MSFT | 594918104 | $118.6M | 7.28% | 320,422 | SH |
| 2 | MICROSOFT CORP | MSFT | 594918104 | $94.4M | 5.80% | 255,127 | SH |
| 3 | RENAISSANCERE HLDGS LTD | RNR | G7496G103 | $92.3M | 5.67% | 310,668 | SH |
| 4 | SELECT SECTOR SPDR TR | XLK | 81369Y803 | $79.3M | 4.87% | 596,326 | SH |
| 5 | SAFETY INS GROUP INC | SAFT | 78648T100 | $73.9M | 4.54% | 1,017,679 | SH |
| 6 | INTEL CORP | INTC | 458140100 | $59.0M | 3.63% | 1,338,061 | SH |
| 7 | SAFETY INS GROUP INC | SAFT | 78648T100 | $56.4M | 3.47% | 776,976 | SH |
| 8 | AMAZON COM INC | AMZN | 023135106 | $49.0M | 3.01% | 235,462 | SH |
| 9 | SELECT SECTOR SPDR TR | XLV | 81369Y209 | $48.7M | 2.99% | 332,074 | SH |
| 10 | SELECT SECTOR SPDR TR | XLC | 81369Y852 | $47.5M | 2.92% | 428,427 | SH |
| 11 | SELECT SECTOR SPDR TR | XLB | 81369Y100 | $46.2M | 2.84% | 925,356 | SH |
| 12 | AMAZON COM INC | AMZN | 023135106 | $44.8M | 2.75% | 214,972 | SH |
| 13 | GE AEROSPACE | GE | 369604301 | $44.6M | 2.74% | 157,300 | SH |
| 14 | SELECT SECTOR SPDR TR | XLC | 81369Y852 | $41.3M | 2.54% | 372,347 | SH |
| 15 | GE AEROSPACE | GE | 369604301 | $40.8M | 2.50% | 143,611 | SH |
| 16 | SELECT SECTOR SPDR TR | XLB | 81369Y100 | $40.2M | 2.47% | 804,224 | SH |
| 17 | WW GRAINGER INC | GWW | 384802104 | $39.3M | 2.41% | 36,042 | SH |
| 18 | WALMART INC | WMT | 931142103 | $38.9M | 2.39% | 313,068 | SH |
| 19 | WALMART INC | WMT | 931142103 | $38.2M | 2.35% | 307,511 | SH |
| 20 | INTEL CORP | INTC | 458140100 | $35.7M | 2.19% | 808,354 | SH |
| 21 | ALPHABET INC | GOOGL | 02079K305 | $35.3M | 2.17% | 122,897 | SH |
| 22 | SELECT SECTOR SPDR TR | XLK | 81369Y803 | $34.2M | 2.10% | 257,098 | SH |
| 23 | WW GRAINGER INC | GWW | 384802104 | $33.6M | 2.06% | 30,819 | SH |
| 24 | SELECT SECTOR SPDR TR | XLV | 81369Y209 | $32.9M | 2.02% | 224,744 | SH |
| 25 | ALPHABET INC | GOOGL | 02079K305 | $30.8M | 1.89% | 107,094 | SH |
| 26 | TOYOTA MOTOR CORP | TM | 892331307 | $30.3M | 1.86% | 147,239 | SH |
| 27 | TOYOTA MOTOR CORP | TM | 892331307 | $29.8M | 1.83% | 144,576 | SH |
| 28 | CVS HEALTH CORP | CVS | 126650100 | $28.5M | 1.75% | 396,796 | SH |
| 29 | MERCK & CO INC | MRK | 58933Y105 | $28.2M | 1.73% | 234,641 | SH |
| 30 | MERCK & CO INC | MRK | 58933Y105 | $27.5M | 1.69% | 228,657 | SH |
| 31 | COMCAST CORP NEW | CMCSA | 20030N101 | $24.9M | 1.53% | 866,233 | SH |
| 32 | RENAISSANCERE HLDGS LTD | RNR | G7496G103 | $23.1M | 1.42% | 77,810 | SH |
| 33 | SHERWIN WILLIAMS CO | SHW | 824348106 | $18.9M | 1.16% | 58,864 | SH |
| 34 | RELIANCE INC | RS | 759509102 | $17.4M | 1.07% | 57,290 | SH |
| 35 | PROCTER & GAMBLE CO | PG | 742718109 | $16.8M | 1.03% | 116,575 | SH |
| 36 | PROCTER & GAMBLE CO | PG | 742718109 | $16.8M | 1.03% | 116,349 | SH |
| 37 | SHERWIN WILLIAMS CO | SHW | 824348106 | $16.4M | 1.01% | 51,177 | SH |
| 38 | SELECT SECTOR SPDR TR | XLY | 81369Y407 | $12.1M | 0.74% | 110,760 | SH |
| 39 | RELIANCE INC | RS | 759509102 | $11.8M | 0.72% | 38,686 | SH |
| 40 | CVS HEALTH CORP | CVS | 126650100 | $7.8M | 0.48% | 109,220 | SH |
| 41 | COMCAST CORP NEW | CMCSA | 20030N101 | $6.6M | 0.41% | 230,452 | SH |
| 42 | SELECT SECTOR SPDR TR | XLI | 81369Y704 | $5.4M | 0.33% | 33,621 | SH |
| 43 | SELECT SECTOR SPDR TR | XLP | 81369Y308 | $4.9M | 0.30% | 59,584 | SH |
| 44 | SELECT SECTOR SPDR TR | XLY | 81369Y407 | $4.8M | 0.29% | 43,780 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 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 |