A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.

Why are some filings missing?

New filings appear as the SEC updates EDGAR, and older records can vary by availability.

How often is this page updated?

Updates follow new EDGAR submissions and periodic data refreshes.

Filer Snapshot

SRB CORP

CIK 0001496228. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.

Entity Type

Company

Total Filings

Latest Filing

14 May 2026

Industry

n/a

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Best next click

Start with the summary below, then verify the strongest source-backed page for this filer.

Open 13F if you want portfolio holdings.
Open 13D/G or insider pages only when this CIK has those rows.

Open 13F portfolio

Source: SEC Form 13F

13F-HR filed on 14 May 2026 for CIK 0001496228.

View Source Filing

Business address: 695 Atlantic Avenue, Boston, MA, 02111
Top holdings (ownership): SAFT
Top securities (13F): MSFT, SAFT, RNR, XLK, INTC, AMZN, XLC, XLB, GE, XLV, WMT, GWW, GOOGL, TM, MRK, CVS, SHW, PG, CMCSA, and RS
Top holdings (Schedule 13G): SAFT
State of incorporation: MA
Fiscal year end: 31 December

Filer intelligence

What SEC filings say about SRB CORP

A compact read of parsed XML filings. 13F, 13D/G, and Forms 3/4/5 are shown separately because they answer different ownership questions.

Open 13F portfolio Save filer

Quick read

Latest parsed 13F shows $1.63B across 23 reported holdings for Q1 2026.
Largest parsed 13F holding: MSFT at $213.05M.
1 recent 13D/G stake row found; top row is SAFT at 12% ownership.
Forms 3/4/5 show insider context for SAFT worth $127.64M.

SEC source mix

Counts show available parsed rows, not one combined ownership total.

XML parsed

13F portfolio 23 rows

Quarterly institutional portfolio holdings.

Open

13D/G stakes 1 rows

Beneficial ownership and large-stake disclosures.

Open

Forms 3/4/5 1 rows

Officer, director, and 10% owner holdings or transactions.

Open

Top parsed 13F holdings

Visual share of the latest parsed 13F portfolio. Values are reported market value, not a recommendation.

Q1 2026 - 14 May 2026

MSFT

13.1%

Microsoft Corp

$213.05M

SAFT

Safety Ins Group Inc

$130.36M

RNR

7.1%

Renaissancere Hldgs Ltd

$115.47M

XLK

Select Sector Spdr Tr

$113.42M

INTC

5.8%

Intel Corp

$94.72M

13D/G large-stake context

SAFT

31 Mar 2026 · Common Stock, par value $0.01 per share

12%

Issuer page 13D/G history

Forms 3/4/5 insider context

SAFT

20 Mar 2026 · 10% owner

$127.64M

Issuer page Owner page

Latest update

What changed recently for SRB CORP

New filing available

Latest 13F period: Q1 2026. Open the source-backed page to inspect the fresh filing or facts context.

Update date

14 May 2026

Page type

Filer profile

Latest period

Q1 2026

Institutional portfolio context was refreshed from a 13F filing filed on 14 May 2026.

Open filer profile Browse recent public updates

Benchmark Context

Benchmark context for this company

SRB CORP has a source-backed company facts view where you can compare the latest reported metrics with its own recent history and with peer rankings for the same metric.

Compared with

Start on the facts page for period-to-period context, then open a metric ranking when you want to compare the same reported fact across other SEC-reporting companies.

Why this is notable

Latest 13F period: Q1 2026. That gives you a fresh baseline before you compare this company with peers.

Peer comparisons stay conservative: same metric, compatible units, latest valid company row only.
Open the facts page first if you want the cleanest path to verification.

Benchmark context is only shown where the app has enough comparable SEC-backed data to keep the interpretation honest.

Open company facts Browse metric rankings

Filer Overview

SRB CORP has filed 98 SEC EDGAR filings since 25 Mar 2011. Common forms include 13F-HR, SCHEDULE 13G/A, 4, N-PX and more.

SRB CORP SEC filings SRB CORP 13F portfolio SRB CORP 13D/G history SRB CORP owner filings

Latest Filings

Recent SEC filings for SRB CORP with direct links to document and filing folders.

13F-HR File 028-15030

13F-HR filing

Filing date: 14 May 2026
Reporting date: 31 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

SCHEDULE 13G/A

SCHEDULE 13G/A filing

Filing date: 13 Apr 2026
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

4 filing

Filing date: 23 Mar 2026
Reporting date: 20 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

4 filing

Filing date: 19 Mar 2026
Reporting date: 17 Mar 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

4 filing

Filing date: 03 Mar 2026
Reporting date: 27 Feb 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

4 filing

Filing date: 27 Feb 2026
Reporting date: 25 Feb 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

4 filing

Filing date: 25 Feb 2026
Reporting date: 23 Feb 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 13 Feb 2026
Reporting date: 31 Dec 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Nov 2025
Reporting date: 30 Sep 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

N-PX File 028-15030

N-PX filing

Filing date: 25 Aug 2025
Reporting date: 30 Jun 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Aug 2025
Reporting date: 30 Jun 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 May 2025
Reporting date: 31 Mar 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Feb 2025
Reporting date: 31 Dec 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Nov 2024
Reporting date: 30 Sep 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

N-PX File 028-15030

N-PX filing

Filing date: 30 Aug 2024
Reporting date: 30 Jun 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Aug 2024
Reporting date: 30 Jun 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 May 2024
Reporting date: 31 Mar 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

SCHEDULE 13G/A

Filing date: 14 Feb 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Feb 2024
Reporting date: 31 Dec 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Nov 2023
Reporting date: 30 Sep 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Aug 2023
Reporting date: 30 Jun 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

4 filing

Filing date: 21 Jul 2023
Reporting date: 19 Jul 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

4 filing

Filing date: 15 Jun 2023
Reporting date: 14 Jun 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

4 filing

Filing date: 08 Jun 2023
Reporting date: 06 Jun 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

4 filing

Filing date: 06 Jun 2023
Reporting date: 02 Jun 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

4 filing

Filing date: 02 Jun 2023
Reporting date: 31 May 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

4 filing

Filing date: 31 May 2023
Reporting date: 26 May 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

4 filing

Filing date: 26 May 2023
Reporting date: 24 May 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

4 filing

Filing date: 24 May 2023
Reporting date: 22 May 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 15 May 2023
Reporting date: 31 Mar 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Feb 2023
Reporting date: 31 Dec 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

SCHEDULE 13G-A

Filing date: 14 Feb 2023
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Nov 2022
Reporting date: 30 Sep 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 12 Aug 2022
Reporting date: 30 Jun 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 13 May 2022
Reporting date: 31 Mar 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

SCHEDULE 13G/A FOR SAFETY INSURANCE GROUP, INC. BY SRB CORPORATION

Filing date: 14 Feb 2022
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Feb 2022
Reporting date: 31 Dec 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 12 Nov 2021
Reporting date: 30 Sep 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 13 Aug 2021
Reporting date: 30 Jun 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 May 2021
Reporting date: 31 Mar 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

SCHEDULE 13G-A FOR SAFETY INSURANCE GROUP, INC. BY SRB CORPORATION.

Filing date: 12 Feb 2021
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 12 Feb 2021
Reporting date: 31 Dec 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 13 Nov 2020
Reporting date: 30 Sep 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

PRIMARY DOCUMENT

Filing date: 06 Nov 2020
Reporting date: 04 Nov 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

PRIMARY DOCUMENT

Filing date: 03 Nov 2020
Reporting date: 30 Oct 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

PRIMARY DOCUMENT

Filing date: 29 Oct 2020
Reporting date: 27 Oct 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

PRIMARY DOCUMENT

Filing date: 22 Oct 2020
Reporting date: 20 Oct 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Aug 2020
Reporting date: 30 Jun 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 May 2020
Reporting date: 31 Mar 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

PRIMARY DOCUMENT

Filing date: 24 Mar 2020
Reporting date: 23 Mar 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

PRIMARY DOCUMENT

Filing date: 23 Mar 2020
Reporting date: 20 Mar 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 000-50070

PRIMARY DOCUMENT

Filing date: 19 Mar 2020
Reporting date: 18 Mar 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

SCHEDULE 13G-A FOR SAFETY INSURANCE GROUP, INC. BY SRB CORPORATION

Filing date: 14 Feb 2020
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Feb 2020
Reporting date: 31 Dec 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Nov 2019
Reporting date: 30 Sep 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Aug 2019
Reporting date: 30 Jun 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 000-50070

PRIMARY DOCUMENT

Filing date: 24 Jun 2019
Reporting date: 20 Jun 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 May 2019
Reporting date: 31 Mar 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

SCHEDULE 13G-A FOR SAFETY INSURANCE GROUP, INC. BY SRB CORPORATION

Filing date: 14 Feb 2019
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Feb 2019
Reporting date: 31 Dec 2018
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Nov 2018
Reporting date: 30 Sep 2018
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Aug 2018
Reporting date: 30 Jun 2018
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 May 2018
Reporting date: 31 Mar 2018
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 000-50070

PRIMARY DOCUMENT

Filing date: 14 Feb 2018
Reporting date: 06 Feb 2018
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Feb 2018
Reporting date: 31 Dec 2017
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

SCHEDULE 13G/A FOR SAFETY INSURANCE GROUP, INC. BY SRB CORPORATION

Filing date: 09 Feb 2018
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Nov 2017
Reporting date: 30 Sep 2017
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Aug 2017
Reporting date: 30 Jun 2017
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 15 May 2017
Reporting date: 31 Mar 2017
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 15 Feb 2017
Reporting date: 31 Dec 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

SCHEDULE 13G/A FOR SAFETY INSURANCE GROUP, INC. BY SRB CORPORATION

Filing date: 15 Feb 2017
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 15 Nov 2016
Reporting date: 30 Sep 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 15 Aug 2016
Reporting date: 30 Jun 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 13 May 2016
Reporting date: 31 Mar 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

SCHEDULE 13G/A FOR SAFETY INSURANCE GROUP, INC.

Filing date: 12 Feb 2016
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 12 Feb 2016
Reporting date: 31 Dec 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 13 Nov 2015
Reporting date: 30 Sep 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR/A File 028-15030

13F-HR/A filing

Filing date: 14 Aug 2015
Reporting date: 30 Jun 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Aug 2015
Reporting date: 30 Jun 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 15 May 2015
Reporting date: 31 Mar 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

SC 13G/A AMENDMENT NO. 4 FOR SAFETY INSURANCE GROUP, INC. BY SRB CORPORATION

Filing date: 17 Feb 2015
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 17 Feb 2015
Reporting date: 31 Dec 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Nov 2014
Reporting date: 30 Sep 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Aug 2014
Reporting date: 30 Jun 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 May 2014
Reporting date: 31 Mar 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

SCHEDULE 13G FOR SAFETY INSURANCE GROUP, INC. BY SRB CORPORATION

Filing date: 14 Feb 2014
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Feb 2014
Reporting date: 31 Dec 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Nov 2013
Reporting date: 30 Sep 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

13F-HR filing

Filing date: 14 Aug 2013
Reporting date: 30 Jun 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

F13-HR FOR SRB CORPORATION FOR QUARTER ENDED 03-31-13

Filing date: 14 May 2013
Reporting date: 31 Mar 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

AMENDMENT 2 TO SCHED 13G FOR SAFETY INSURANCE GROUP BY SEB CORPORATION

Filing date: 13 Feb 2013
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

FORM 13F-HR FOR SRB CORPORATION FOR QUARTER ENDED 12/31/12

Filing date: 12 Feb 2013
Reporting date: 31 Dec 2012
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

FORM 13F-HR FOR SRB CORPORATION FOR QUARTER ENDED 09/30/12

Filing date: 14 Nov 2012
Reporting date: 30 Sep 2012
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

FORM 13F-HR FOR SRB CORPORATION, QUARTER ENDED 6/30/12

Filing date: 14 Aug 2012
Reporting date: 30 Jun 2012
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

FORM 13F-HR FOR SRB CORPORATION

Filing date: 14 Aug 2012
Reporting date: 31 Dec 2011
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-15030

FORM 13F-NT FOR SRB CORPORATION QUARTER ENDED 3/31/12

Filing date: 14 Aug 2012
Reporting date: 31 Mar 2012
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

AMD 1 TO SCHED 13G FOR SAFETY INSURANCE GROUP BY SRB CORPORATION

Filing date: 24 Jan 2012
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G

SCHEDULE 13G FOR SAFETY INSURANCE GROUP BY SRB CORPORATION

Filing date: 25 Mar 2011
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

About this filer

SRB CORP files with the SEC under CIK 0001496228. This page aggregates EDGAR filings and related ownership activity.

FAQ

What is a CIK?: A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.
Why are some filings missing?: New filings appear as the SEC updates EDGAR, and older records can vary by availability.
How often is this page updated?: Updates follow new EDGAR submissions and periodic data refreshes.