# EDGAR Filing Document

**Accession Number:** 0001496228
**File Stem:** 0000904454-26-000102
**Filing Date:** 2026-2
**Character Count:** 8592
**Document Hash:** 3a4898794d95586da2a5b3bce96b63b2
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000904454-26-000102.hdr.sgml**: 20260213

**ACCESSION NUMBER**: 0000904454-26-000102

**CONFORMED SUBMISSION TYPE**: 13F-HR

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20251231

**FILED AS OF DATE**: 20260213

**DATE AS OF CHANGE**: 20260213

**EFFECTIVENESS DATE**: 20260213

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SRB CORP
- **CENTRAL INDEX KEY:** 0001496228

**ORGANIZATION NAME:**
- **EIN:** 042968130
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 13F-HR
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 028-15030
- **FILM NUMBER:** 26631955

**BUSINESS ADDRESS:**
- **STREET 1:** 695 ATLANTIC AVENUE
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02111
- **BUSINESS PHONE:** 617-457-7527

**MAIL ADDRESS:**
- **STREET 1:** 695 ATLANTIC AVENUE
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02111

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** SRB Corp
- **DATE OF NAME CHANGE:** 20100709

### FORM 13F COVER PAGE

**Report for the Calendar Year or Quarter Ended:** 12-31-2025

**Check here if Amendment** [ ] **Amendment Number:** 

**This Amendment (Check only one.):** [ ] is a restatement.

[ ] adds new holdings entries.

**Institutional Investment Manager Filing this Report:**

**Name:** SRB CORP<br>**Address:** 695 ATLANTIC AVENUE<br>BOSTON, MA 02111

**Form 13F File Number:** 028-15030

**CRD Number (if applicable):** 000161163

**SEC File Number (if applicable):** 801-73734

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

**Person Signing this Report on Behalf of Reporting Manager:**

**Name:** Frederick C. Childs<br>**Title:** Vice President<br>**Phone:** 857-205-1697

**Signature, Place, and Date of Signing:**

/s/ Frederick C. Childs  Boston, MA  02-03-2026<br>[Signature]  [City, State]  [Date]

**Report Type (Check only one.):**

[x] **13F HOLDINGS REPORT.** (Check here if all holdings of this reporting manager are reported in this report.)

[ ] **13F NOTICE.** (Check here if no holdings are reported in this report, and all holdings are reported by other reporting manager(s).)

[ ] **13F COMBINATION REPORT.** (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)

### Form 13F Summary Page

**Report Summary:**

**Number of Other Included Managers:** 2

**Form 13F Information Table Entry Total:** 44

**Form 13F Information Table Value Total:** $1821787217

      (round to nearest dollar)

**List of Other Included Managers:**

Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report.

[If there are no entries in this list, state “NONE” and omit the column headings and list entries.]

| No.   | Name                                    | Form 13F File Number   |
|:---|:---|:---|
|  | Plymouth Rock Co Inc                    | 028-15035              |
|  | Palisades Safety  Insurance Association | 028-15488              |

### FORM 13F INFORMATION TABLE

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| NAME OF ISSUER | TITLE OF CLASS | CUSIP | FIGI | VALUE (x$1000) | SHRS OR PRN AMT | SH/PRN | PUT/CALL | INVESTMENT DISCRETION | OTHER MANAGER | VOTING AUTHORITY | VOTING AUTHORITY | VOTING AUTHORITY |
| NAME OF ISSUER | TITLE OF CLASS | CUSIP | FIGI | VALUE (x$1000) | SHRS OR PRN AMT | SH/PRN | PUT/CALL | INVESTMENT DISCRETION | OTHER MANAGER | SOLE | SHARED | NONE |
| ALPHABET CL A ORD | CAP STK CL A | 02079K305 |  | 33520422 | 107094 | SH |  | DFND | 1 2 | 107094 | 0 | 0 |
| ALPHABET CL A ORD | CAP STK CL A | 02079K305 |  | 39787621 | 127117 | SH |  | DFND | 1 | 127117 | 0 | 0 |
| AMAZON COM ORD | COM | 023135106 |  | 49619837 | 214972 | SH |  | DFND | 1 2 | 214972 | 0 | 0 |
| AMAZON COM ORD | COM | 023135106 |  | 56661232 | 245478 | SH |  | DFND | 1 | 245478 | 0 | 0 |
| COMCAST CL A ORD | CL A | 20030N101 |  | 25891704 | 866233 | SH |  | DFND | 1 2 | 866233 | 0 | 0 |
| COMCAST CL A ORD | CL A | 20030N101 |  | 6888210 | 230452 | SH |  | DFND | 1 | 230452 | 0 | 0 |
| CVS HEALTH ORD | COM | 126650100 |  | 31489731 | 396796 | SH |  | DFND | 1 2 | 396796 | 0 | 0 |
| CVS HEALTH ORD | COM | 126650100 |  | 10321482 | 130059 | SH |  | DFND | 1 | 130059 | 0 | 0 |
| GE AEROSPACE ORD | COM NEW | 369604301 |  | 55180802 | 179141 | SH |  | DFND | 1 2 | 179141 | 0 | 0 |
| GE AEROSPACE ORD | COM NEW | 369604301 |  | 58757955 | 190754 | SH |  | DFND | 1 | 190754 | 0 | 0 |
| INTEL ORD | COM | 458140100 |  | 29828263 | 808354 | SH |  | DFND | 1 2 | 808354 | 0 | 0 |
| INTEL ORD | COM | 458140100 |  | 50801854 | 1376744 | SH |  | DFND | 1 | 1376744 | 0 | 0 |
| MERCK  CO ORD | COM | 58933Y105 |  | 24698312 | 234641 | SH |  | DFND | 1 2 | 234641 | 0 | 0 |
| MERCK  CO ORD | COM | 58933Y105 |  | 25128088 | 238724 | SH |  | DFND | 1 | 238724 | 0 | 0 |
| MICROSOFT ORD | COM | 594918104 |  | 171447643 | 354509 | SH |  | DFND | 1 2 | 354509 | 0 | 0 |
| MICROSOFT ORD | COM | 594918104 |  | 163663779 | 338414 | SH |  | DFND | 1 | 338414 | 0 | 0 |
| PROCTER  GAMBLE ORD | COM | 742718109 |  | 18053477 | 125975 | SH |  | DFND | 1 2 | 125975 | 0 | 0 |
| PROCTER  GAMBLE ORD | COM | 742718109 |  | 20014675 | 139660 | SH |  | DFND | 1 | 139660 | 0 | 0 |
| RELIANCE ORD | COM | 759509102 |  | 16549362 | 57290 | SH |  | DFND | 1 2 | 57290 | 0 | 0 |
| RELIANCE ORD | COM | 759509102 |  | 11826627 | 40941 | SH |  | DFND | 1 | 40941 | 0 | 0 |
| RENAISSANCERE ORD | COM | G7496G103 |  | 24099629 | 85715 | SH |  | DFND | 1 2 | 85715 | 0 | 0 |
| RENAISSANCERE ORD | COM | G7496G103 |  | 94012594 | 334374 | SH |  | DFND | 1 | 334374 | 0 | 0 |
| SAFETY INSURANCE GROUP ORD | COM | 78648T100 |  | 79994170 | 1026751 | SH |  | DFND | 1 2 | 1026751 | 0 | 0 |
| SAFETY INSURANCE GROUP ORD | COM | 78648T100 |  | 63538176 | 815533 | SH |  | DFND | 1 | 815533 | 0 | 0 |
| SEL SCTR:C D SS SPDR IN | STATE STREET CON | 81369Y407 |  | 5227770 | 43780 | SH |  | DFND | 1 2 | 43780 | 0 | 0 |
| SEL SCTR:C D SS SPDR IN | STATE STREET CON | 81369Y407 |  | 13225852 | 110760 | SH |  | DFND | 1 | 110760 | 0 | 0 |
| SEL SCTR:COMS SS SPDR | STATE STREET COM | 81369Y852 |  | 43832689 | 372347 | SH |  | DFND | 1 2 | 372347 | 0 | 0 |
| SEL SCTR:COMS SS SPDR | STATE STREET COM | 81369Y852 |  | 50434426 | 428427 | SH |  | DFND | 1 | 428427 | 0 | 0 |
| SEL SECTOR:C SSS SPDR I | STATE STREET CON | 81369Y308 |  | 4628485 | 59584 | SH |  | DFND | 1 | 59584 | 0 | 0 |
| SEL SECTOR:HC SS SPDR | STATE STREET HEA | 81369Y209 |  | 34790371 | 224744 | SH |  | DFND | 1 2 | 224744 | 0 | 0 |
| SEL SECTOR:HC SS SPDR | STATE STREET HEA | 81369Y209 |  | 51405055 | 332074 | SH |  | DFND | 1 | 332074 | 0 | 0 |
| SEL SECTOR:IND SS SPDR | STATE STREET IND | 81369Y704 |  | 5215290 | 33621 | SH |  | DFND | 1 | 33621 | 0 | 0 |
| SEL SECTOR:MAT SS SPDR | STATE STREET MAT | 81369Y100 |  | 36471558 | 804224 | SH |  | DFND | 1 2 | 804224 | 0 | 0 |
| SEL SECTOR:MAT SS SPDR | STATE STREET MAT | 81369Y100 |  | 41964895 | 925356 | SH |  | DFND | 1 | 925356 | 0 | 0 |
| SEL SECTOR:TECH SPDR | STATE STREET TEC | 81369Y803 |  | 37014399 | 257098 | SH |  | DFND | 1 2 | 257098 | 0 | 0 |
| SEL SECTOR:TECH SPDR | STATE STREET TEC | 81369Y803 |  | 85853054 | 596326 | SH |  | DFND | 1 | 596326 | 0 | 0 |
| SHERWIN WILLIAMS ORD | COM | 824348106 |  | 16582883 | 51177 | SH |  | DFND | 1 2 | 51177 | 0 | 0 |
| SHERWIN WILLIAMS ORD | COM | 824348106 |  | 19731159 | 60893 | SH |  | DFND | 1 | 60893 | 0 | 0 |
| TOYOTA MOTOR ADR REP 10 ORD | ADS | 892331307 |  | 30947939 | 144576 | SH |  | DFND | 1 2 | 144576 | 0 | 0 |
| TOYOTA MOTOR ADR REP 10 ORD | ADS | 892331307 |  | 32861635 | 153516 | SH |  | DFND | 1 | 153516 | 0 | 0 |
| WALMART ORD | COM | 931142103 |  | 38395109 | 344598 | SH |  | DFND | 1 2 | 344598 | 0 | 0 |
| WALMART ORD | COM | 931142103 |  | 42612802 | 382452 | SH |  | DFND | 1 | 382452 | 0 | 0 |
| WW GRAINGER ORD | COM | 384802104 |  | 31097912 | 30819 | SH |  | DFND | 1 2 | 30819 | 0 | 0 |
| WW GRAINGER ORD | COM | 384802104 |  | 37718289 | 37380 | SH |  | DFND | 1 | 37380 | 0 | 0 |

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