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SRB CORP

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13F filer, CIK 1496228, BOSTON, MA

SRB CORP reported $1,628,203,563 across 23 holdings for the quarter ended 2026-03-31, in a 13F-HR filed 2026-05-14. Its ten largest share positions make up 67.75% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0000904454-26-000289

Period
2026-03-31
Reported value
$1.63B
Holdings
23
Top 10 weight
67.75%
New
0
Sold out
0

Part of the filer group SRB CORP

How groups are built

Largest buys vs the previous quarter

None.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
MSFTreduced-117,374-$43.4M
GEreduced-68,984-$19.6M
WMTreduced-106,471-$13.2M
RNRreduced-31,611-$9.4M
PGreduced-32,711-$4.72M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q1 2026

Share positions as resolved from 13F-HR 0000904454-26-000289, largest first. % of portfolio is the value over $1,628,203,563, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
MSFTMICROSOFT CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 748,727 shares; 2024Q4: 748,727 shares; 2025Q1: 693,012 shares; 2025Q2: 692,923 shares; 2025Q3: 692,923 shares; 2025Q4: 692,923 shares; 2026Q1: 575,549 shares 575,549$213M13.09%-117,374Timeline
SAFTSAFETY INS GROUP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 1,842,284 shares; 2024Q4: 1,842,284 shares; 2025Q1: 1,842,284 shares; 2025Q2: 1,842,284 shares; 2025Q3: 1,842,284 shares; 2025Q4: 1,842,284 shares; 2026Q1: 1,794,655 shares 1,794,655$130M8.01%-47,629Timeline
RNRRENAISSANCERE HLDGS LTDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 443,851 shares; 2024Q4: 443,851 shares; 2025Q1: 421,659 shares; 2025Q2: 421,659 shares; 2025Q3: 420,089 shares; 2025Q4: 420,089 shares; 2026Q1: 388,478 shares 388,478$115M7.09%-31,611Timeline
XLKSELECT SECTOR SPDR TRQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 511,482 shares; 2025Q2: 324,185 shares; 2025Q3: 400,624 shares; 2025Q4: 853,424 shares; 2026Q1: 853,424 shares 853,424$113M6.97%0Timeline
INTCINTEL CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 4,398,974 shares; 2024Q4: not reported; 2025Q1: 2,185,098 shares; 2025Q2: 2,185,098 shares; 2025Q3: 2,185,098 shares; 2025Q4: 2,185,098 shares; 2026Q1: 2,146,415 shares 2,146,415$94.7M5.82%-38,683Timeline
AMZNAMAZON COM INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 490,272 shares; 2024Q4: 490,272 shares; 2025Q1: 490,272 shares; 2025Q2: 490,272 shares; 2025Q3: 460,450 shares; 2025Q4: 460,450 shares; 2026Q1: 450,434 shares 450,434$93.8M5.76%-10,016Timeline
XLCSELECT SECTOR SPDR TRQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 34,940 shares; 2025Q1: 714,509 shares; 2025Q2: 800,774 shares; 2025Q3: 800,774 shares; 2025Q4: 800,774 shares; 2026Q1: 800,774 shares 800,774$88.8M5.45%0Timeline
XLBSELECT SECTOR SPDR TRQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 35,489 shares; 2025Q1: 730,289 shares; 2025Q2: 864,790 shares; 2025Q3: 864,790 shares; 2025Q4: 1,729,580 shares; 2026Q1: 1,729,580 shares 1,729,580$86.4M5.31%0Timeline
GEGE AEROSPACEQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 396,579 shares; 2024Q4: 396,579 shares; 2025Q1: 382,754 shares; 2025Q2: 382,754 shares; 2025Q3: 369,895 shares; 2025Q4: 369,895 shares; 2026Q1: 300,911 shares 300,911$85.4M5.24%-68,984Timeline
XLVSELECT SECTOR SPDR TRQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 24,429 shares; 2025Q1: 58,591 shares; 2025Q2: 556,818 shares; 2025Q3: 556,818 shares; 2025Q4: 556,818 shares; 2026Q1: 556,818 shares 556,818$81.6M5.01%0Timeline
WMTWALMART INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 767,502 shares; 2024Q4: 767,502 shares; 2025Q1: 767,502 shares; 2025Q2: 767,502 shares; 2025Q3: 727,050 shares; 2025Q4: 727,050 shares; 2026Q1: 620,579 shares 620,579$77.1M4.74%-106,471Timeline
GWWWW GRAINGER INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 72,018 shares; 2024Q4: 72,018 shares; 2025Q1: 70,760 shares; 2025Q2: 70,760 shares; 2025Q3: 68,199 shares; 2025Q4: 68,199 shares; 2026Q1: 66,861 shares 66,861$72.9M4.48%-1,338Timeline
GOOGLALPHABET INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 428,093 shares; 2024Q4: 428,093 shares; 2025Q1: 234,211 shares; 2025Q2: 234,211 shares; 2025Q3: 234,211 shares; 2025Q4: 234,211 shares; 2026Q1: 229,991 shares 229,991$66.1M4.06%-4,220Timeline
TMTOYOTA MOTOR CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 390,948 shares; 2024Q4: 398,656 shares; 2025Q1: 298,992 shares; 2025Q2: 298,992 shares; 2025Q3: 298,092 shares; 2025Q4: 298,092 shares; 2026Q1: 291,815 shares 291,815$60.1M3.69%-6,277Timeline
MRKMERCK & CO INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 1,297,433 shares; 2024Q4: 1,297,433 shares; 2025Q1: 1,245,536 shares; 2025Q2: 496,546 shares; 2025Q3: 473,365 shares; 2025Q4: 473,365 shares; 2026Q1: 463,298 shares 463,298$55.7M3.42%-10,067Timeline
CVSCVS HEALTH CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 1,131,646 shares; 2024Q4: 1,131,646 shares; 2025Q1: 678,988 shares; 2025Q2: 596,193 shares; 2025Q3: 526,855 shares; 2025Q4: 526,855 shares; 2026Q1: 506,016 shares 506,016$36.3M2.23%-20,839Timeline
SHWSHERWIN WILLIAMS COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 253,460 shares; 2024Q4: 253,460 shares; 2025Q1: 112,070 shares; 2025Q2: 112,070 shares; 2025Q3: 112,070 shares; 2025Q4: 112,070 shares; 2026Q1: 110,041 shares 110,041$35.3M2.17%-2,029Timeline
PGPROCTER & GAMBLE COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 280,762 shares; 2024Q4: 280,762 shares; 2025Q1: 280,762 shares; 2025Q2: 280,762 shares; 2025Q3: 265,635 shares; 2025Q4: 265,635 shares; 2026Q1: 232,924 shares 232,924$33.6M2.07%-32,711Timeline
CMCSACOMCAST CORP NEWQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 2,009,847 shares; 2024Q4: 2,009,847 shares; 2025Q1: 1,007,150 shares; 2025Q2: 1,007,150 shares; 2025Q3: 1,007,150 shares; 2025Q4: 1,096,685 shares; 2026Q1: 1,096,685 shares 1,096,685$31.5M1.93%0Timeline
RSRELIANCE INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: 235,075 shares; 2024Q4: 235,075 shares; 2025Q1: 98,231 shares; 2025Q2: 98,231 shares; 2025Q3: 98,231 shares; 2025Q4: 98,231 shares; 2026Q1: 95,976 shares 95,976$29.2M1.79%-2,255Timeline
XLYSELECT SECTOR SPDR TRQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 17,692 shares; 2025Q1: 77,270 shares; 2025Q2: 77,270 shares; 2025Q3: 77,270 shares; 2025Q4: 154,540 shares; 2026Q1: 154,540 shares 154,540$16.8M1.03%0Timeline
XLISELECT SECTOR SPDR TRQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 20,584 shares; 2025Q1: 33,621 shares; 2025Q2: 33,621 shares; 2025Q3: 33,621 shares; 2025Q4: 33,621 shares; 2026Q1: 33,621 shares 33,621$5.44M0.33%0Timeline
XLPSELECT SECTOR SPDR TRQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 26,265 shares; 2025Q1: 59,584 shares; 2025Q2: 59,584 shares; 2025Q3: 59,584 shares; 2025Q4: 59,584 shares; 2026Q1: 59,584 shares 59,584$4.88M0.3%0Timeline

How Q1 2026 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0000904454-26-000289 base2026-05-14acceptance time not in the bulk data set