SRB Corporation

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SRB Corporation
CRD #161163
SEC #801-73734
CIK #0001496228
AUM 4,821.1 M (2026-03-30)
Employees 4 (50% Investors, 0% Brokers)
Fees
Minimum
Phone857-205-1697
Address695 Atlantic Avenue
Boston, MA 02111-2623
Source [IAPD] [EDGAR]
Total AUM ($B)
5.04.03.02.01.00.02010201520212027
Fees and Compensation — Form ADV Part 2A (3/30/2026) [Brochure]
Item 5 – Fees and Compensation

A. SRB’s Fee Schedule is as follows:
      If the client’s portfolio is invested only in fixed-income securities, the annual fee will be 0.35%,
       calculated and paid quarterly in arrears, on the basis of the total value of the client’s portfolio as of
       the last business day of the immediately preceding calendar quarter.

      If no more than 25% of the client’s portfolio is invested in equities and/or real estate, the annual
       fee will be 0.50%, calculated and paid quarterly in arrears, on the basis of the total value of the
       client’s portfolio as of the last business day of the immediately preceding calendar quarter.

      If more than 25% of the client’s portfolio is invested in equities and/or real estate, the annual fee
       will be 0.65%, calculated and paid quarterly in arrears, on the basis of the total value of the client’s
       portfolio as of the last business day of the immediately preceding calendar quarter.

B. Fee Payment Method – SRB invoices its clients each quarter for payment of its fees; SRB does not
   deduct its fees from client portfolios.

C. Other Fees and Expenses
      Custody – the fee of the custodian of client assets managed by SRB is included in SRB’s fee; there
       is no additional cost to the client for custodial services.
      Fixed Income Manager – the fee of a registered investment adviser that manages portfolios of fixed-
       income securities is included in SRB’s fee; there is no additional cost to the client for this service.
      Investment Accounting Systems – half of the cost of investment accounting systems is included in
       SRB’s fee; the other half is an additional cost paid directly by the client. SRB’s staff includes
       accountants who provide investment accounting services; the cost of such services is included in
       SRB’s fee.
      Marketable Equity and Fixed Income Securities Trading – transaction costs for trading securities,
       such as brokerage commissions, are deducted directly from the client’s portfolio. Please refer to
Account Minimums and Types of Clients — Form ADV Part 2A (3/30/2026) [Brochure]
Item 7 – Types of Clients

SRB’s clients are property/casualty insurance companies and companies related to them. SRB’s clients do
not include individuals, trusts, investment companies, or pension plans.
Sector Form 13F Holdings Value ($M)
Microsoft Corp 213.1
Safety Insurance Group Inc 130.4
Renaissancere Holdings Ltd 115.5
Intel Corp 94.7
Amazon Com Inc 93.8
General Electric Co 85.4
Wal Mart Stores Inc 77.1
Grainger W W Inc 72.9
Alphabet Inc 66.1
Toyota Motor Corp/ 60.1
View All
Holdings by Sector ($M)
20001600120080040002011201620212027
AUM Breakdown Accounts AUM ($B)
By Client Type
(a) Individuals (other than high net worth individuals) 0 0.0
(b) Individuals (high net worth individuals) 0 0.0
(c) Banking or thrift institutions 0 0.0
(d) Investment companies 0 0.0
(e) Business development companies 0 0.0
(f) Pooled investment vehicles 0 0.0
(g) Pension and profit sharing plans 0 0.0
(h) Charitable organizations 0 0.0
(i) State or municipal government entities 0 0.0
(j) Other investment advisers 0 0.0
(k) Insurance companies 20 4.6
(l) Sovereign wealth funds and foreign official institutions 0 0.0
(m) Corporations or other businesses not listed above 0 0.2
(n) Other 0 0.0
Total 22 4.8
By Discretionary
Discretionary 22 4.8
Non-Discretionary 0 0.0
Total 22 4.8
By Non-United States Persons
Non-United States Persons 0.0
United States Persons 4.8
Total 22 4.8
EDGAR Form CIK 2011 - 2026
13F-HR [0001496228]
3 [0001496228]
4 [0001496228]
Firm Profile (Form ADV)
Discretionary AUM$2.3B
Clients22
Form 3/4/5 Subject 2011 - 2026
Plymouth Rock Co Inc
SRB Corp
Safety Insurance Group Inc
Palisades Safety & Insurance Association
Insider Transaction (Form 3/4/5) Date Action Shares Price Value ($)
Safety Insurance Group Inc SAFT
Common Stock
2026-03-20 Sell 14,151 $71.12 1,006,419
Safety Insurance Group Inc SAFT
Common Stock
2026-03-17 Sell 1,199 $73.06 87,599
Safety Insurance Group Inc SAFT
Common Stock
2026-03-02 Sell 11,270 $76.49 862,042
Safety Insurance Group Inc SAFT
Common Stock
2026-02-27 Sell 235 $77.82 18,288
Safety Insurance Group Inc SAFT
Common Stock
2026-02-26 Sell 5,280 $78.91 416,645
Safety Insurance Group Inc SAFT
Common Stock
2026-02-26 Sell 6,207 $77.89 483,463
Safety Insurance Group Inc SAFT
Common Stock
2026-02-25 Sell 2,147 $78.29 168,089
Safety Insurance Group Inc SAFT
Common Stock
2026-02-24 Sell 3,231 $77.14 249,239
Safety Insurance Group Inc SAFT
Common Stock
2026-02-23 Sell 4,089 $77.48 316,816
Safety Insurance Group Inc SAFT
Common Stock
2023-07-19 Buy 32,384 $67.24 2,177,500
Safety Insurance Group Inc SAFT
Common Stock
2023-06-14 Buy 14,338 $73.79 1,058,001
Safety Insurance Group Inc SAFT
Common Stock
2023-06-06 Buy 9,820 $73.86 725,305
Safety Insurance Group Inc SAFT
Common Stock
2023-06-05 Buy 25,400 $73.72 1,872,488
Safety Insurance Group Inc SAFT
Common Stock
2023-06-02 Buy 1,397 $73.98 103,350
Safety Insurance Group Inc SAFT
Common Stock
2023-06-01 Buy 6,800 $72.78 494,904
Safety Insurance Group Inc SAFT
Common Stock
2023-05-31 Buy 11,201 $73.03 818,009
Safety Insurance Group Inc SAFT
Common Stock
2023-05-31 Buy 19,594 $73.86 1,447,213
Safety Insurance Group Inc SAFT
Common Stock
2023-05-30 Buy 716 $72.00 51,552
Safety Insurance Group Inc SAFT
Common Stock
2023-05-30 Buy 5,419 $73.23 396,833
Safety Insurance Group Inc SAFT
Common Stock
2023-05-26 Buy 1,348 $71.87 96,881
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