Form990-PF

Department of the Treasury
Internal Revenue Service

Return of Private Foundation
or Section 4947(a)(1) Trust Treated as Private Foundation
Do not enter social security numbers on this form as it may be made public.
Go to www.irs.gov/Form990PF for instructions and the latest information.
OMB No. 1545-0047
2025
Open to Public Inspection
For calendar year 2025, or tax year beginning 01 - 01 2025, and ending 12 - 31, 20 25
Name of foundation
JOSEPH M HAMILBURG FOUNDATION
 
Number and street (or P.O. box number if mail is not delivered to street address) 16 SHAW DRIVE
  Room/suite
City or town
WAYLAND
State or province
MA
Country  
ZIP or foreign postal code
01778
A Employer identification number

04-6128210
B Telephone number (see instructions)

6174882700
C
G Check all that apply:

D 1. Foreign organizations, check here.............
2. Foreign organizations meeting the 85%
test, check here and attach computation ...
E
H Check type of organization:
F
I Fair market value of all assets at end
of year (from Part II, col. (c),
line 16)$1,741,523J Accounting method:
 
(Part I, column (d) must be on cash basis.)
Part I Analysis of Revenue and Expenses (The total of amounts in columns (b), (c), and (d) may not necessarily equal the amounts in column (a) (see instructions).) (a) Revenue and
expenses per
books 		(b) Net investment
income 		(c) Adjusted net
income 		(d) Disbursements
for charitable
purposes
(cash basis only)
Revenue 1 Contributions, gifts, grants, etc., received (attach schedule)  
2 Check .................
3 Interest on savings and temporary cash investments      
4 Dividends and interest from securities... 49,208 49,208  
5a Gross rents............      
b Net rental income or (loss)  
6a Net gain or (loss) from sale of assets not on line 10 72,390
b Gross sales price for all assets on line 6a 679,471
7 Capital gain net income (from Part IV, line 2)... 72,390
8 Net short-term capital gain.........  
9 Income modifications...........  
10a Gross sales less returns and allowances  
b Less: Cost of goods sold....  
c Gross profit or (loss) (attach schedule).....    
11 Other income (attach schedule).......      
12 Total. Add lines 1 through 11........ 121,598 121,598  
Operating and Administrative Expenses 13 Compensation of officers, directors, trustees, etc. 0 0   0
14 Other employee salaries and wages......        
15 Pension plans, employee benefits.......        
16a Legal fees (attach schedule).........        
b Accounting fees (attach schedule).......        
c Other professional fees (attach schedule).... Click to see attachment
List of Attached Documents:
// Content
16,560 16,560   0
17 Interest...............        
18 Taxes (attach schedule) (see instructions)... Click to see attachment
List of Attached Documents:
// Content
3,375 311   0
19 Depreciation (attach schedule) and depletion...      
20 Occupancy..............        
21 Travel, conferences, and meetings.......        
22 Printing and publications..........        
23 Other expenses (attach schedule)....... Click to see attachment
List of Attached Documents:
// Content
35 0   0
24 Total operating and administrative expenses.
Add lines 13 through 23.......... 19,970 16,871   0
25 Contributions, gifts, grants paid....... 72,600 72,600
26 Total expenses and disbursements. Add lines 24 and 25 ................ 92,570 16,871   72,600
27 Subtract line 26 from line 12:
a Excess of revenue over expenses and disbursements 29,028
b Net investment income (if negative, enter -0-) 104,727
c Adjusted net income (if negative, enter -0-)...  
For Paperwork Reduction Act Notice, see instructions.
Cat. No. 11289X Form 990-PF (2025)
Form 990-PF (2025)
Page 2
Part II Balance Sheets Attached schedules and amounts in the description column
should be for end-of-year amounts only. (See instructions.) 		Beginning of year End of year
(a) Book Value (b) Book Value (c) Fair Market Value
Assets 1 Cash—non-interest-bearing............. 2 -2 -2
2 Savings and temporary cash investments......... 71,297 28,083 28,083
3 Accounts receivable  
Less: allowance for doubtful accounts        
4 Pledges receivable  
Less: allowance for doubtful accounts        
5 Grants receivable................. 10,750 14,750 14,750
6 Receivables due from officers, directors, trustees, and other
disqualified persons (attach schedule) (see instructions).....      
7 Other notes and loans receivable (attach schedule)  
Less: allowance for doubtful accounts        
8 Inventories for sale or use..............      
9 Prepaid expenses and deferred charges..........      
10a Investments—U.S. and state government obligations (attach schedule)      
b Investments—corporate stock (attach schedule).......      
c Investments—corporate bonds (attach schedule).......      
11 Investments—land, buildings, and equipment: basis  
Less: accumulated depreciation (attach schedule)        
12 Investments—mortgage loans.............      
13 Investments—other (attach schedule).......... 1,023,226 Click to see attachment
List of Attached Documents:
// Content
1,091,472 		1,698,692
14 Land, buildings, and equipment: basis  
Less: accumulated depreciation (attach schedule)        
15 Other assets (describe )      
16 Total assets (to be completed by all filers—see the
instructions. Also, see page 1, item I) 1,105,275 1,134,303 1,741,523
Liabilities 17 Accounts payable and accrued expenses..........    
18 Grants payable.................    
19 Deferred revenue.................    
20 Loans from officers, directors, trustees, and other disqualified persons    
21 Mortgages and other notes payable (attach schedule)......    
22 Other liabilities (describe )    
23 Total liabilities (add lines 17 through 22)......... 0 0
Net Assets or Fund Balances Foundations that follow FASB ASC 958, check here
and complete lines 24, 25, 29 and 30.
24 Net assets without donor restrictions...........    
25 Net assets with donor restrictions............    
Foundations that do not follow FASB ASC 958, check here
and complete lines 26 through 30.
26 Capital stock, trust principal, or current funds........ 1,733,143 1,733,143
27 Paid-in or capital surplus, or land, bldg., and equipment fund 0 0
28 Retained earnings, accumulated income, endowment, or other funds -627,868 -598,840
29 Total net assets or fund balances (see instructions)..... 1,105,275 1,134,303
30 Total liabilities and net assets/fund balances (see instructions). 1,105,275 1,134,303
Part III
Analysis of Changes in Net Assets or Fund Balances
1
Total net assets or fund balances at beginning of year—Part II, column (a), line 29 (must agree with end-of-year figure reported on prior year’s return) ...............
1
1,105,275
2
Enter amount from Part I, line 27a .....................
2
29,028
3
Other increases not included in line 2 (itemize)
3
0
4
Add lines 1, 2, and 3 ..........................
4
1,134,303
5
Decreases not included in line 2 (itemize)
5
0
6
Total net assets or fund balances at end of year (line 4 minus line 5)—Part II, line 29, column (b) ..
6
1,134,303
Form 990-PF (2025)
Form 990-PF (2025)
Page 3
Part IV
Capital Gains and Losses for Tax on Investment Income
(a) List and describe the kind(s) of property sold (e.g., real estate,
2-story brick warehouse; or common stock, 200 shs. MLC Co.)		 (b)
How acquired
P—Purchase
D—Donation 		(c)
Date acquired
(mo., day, yr.) 		(d)
Date sold
(mo., day, yr.)
1 a FIDELITY X3705 S P    
b FIDELITY X3705 L P    
c CAPITAL GAINS DIVIDENDS P    
d
e
(e)
Gross sales price 		(f)
Depreciation allowed
(or allowable) 		(g)
Cost or other basis
plus expense of sale 		(h)
Gain or (loss)
(e) plus (f) minus (g)
a 176,826   172,147 4,679
b 495,402   434,934 60,468
c 7,243     7,243
d
e
Complete only for assets showing gain in column (h) and owned by the foundation on 12/31/69 (l)
Gains (Col. (h) gain minus
col. (k), but not less than -0-) or
Losses (from col.(h))
(i)
F.M.V. as of 12/31/69 		(j)
Adjusted basis
as of 12/31/69 		(k)
Excess of col. (i)
over col. (j), if any
a       4,679
b       60,468
c       7,243
d
e
2 Capital gain net income or (net capital loss) Bracket If gain, also enter in Part I, line 7
If (loss), enter -0- in Part I, line 7		 Bracket 2 72,390
3 Net short-term capital gain or (loss) as defined in sections 1222(5) and (6):
If gain, also enter in Part I, line 8, column (c) (see instructions). If (loss), enter -0-
in Part I, line 8 ......................... 		Bracket 3  
Part V
Excise Tax Based on Investment Income (Section 4940(a), 4940(b), 4940(e), or 4948—see instructions)
1a Exempt operating foundations described in section 4940(d)(2), check here and enter “N/A" on line 1. Bracket for line 1a
Date of ruling or determination letter:   (attach copy of letter if necessary–see instructions) 1 1,456
b All other domestic foundations enter 1.39% (0.0139) of line 27b. Exempt foreign organizations enter 4% (0.04) of Part I, line 12, col. (b)
2 Tax under section 511 (domestic section 4947(a)(1) trusts and taxable foundations only. Others enter -0-) 2 0
3 Add lines 1 and 2........................... 3 1,456
4 Subtitle A (income) tax (domestic section 4947(a)(1) trusts and taxable foundations only. Others enter -0-) 4 0
5 Tax based on investment income. Subtract line 4 from line 3. If zero or less, enter -0- ..... 5 1,456
6 Credits/Payments:
a 2025 estimated tax payments and 2024 overpayment credited to 2025 6a 1,500
b Exempt foreign organizations—tax withheld at source...... 6b 0
c Tax paid with application for extension of time to file (Form 8868)... 6c 0
d Backup withholding erroneously withheld .......... 6d 0
7 Total credits and payments. Add lines 6a through 6d.............. 7 1,500
8 Enter any penalty for underpayment of estimated tax. Check here if Form 2220 is attached. 8 0
9 Tax due. If the total of lines 5 and 8 is more than line 7, enter amount owed....... 9  
10 Overpayment. If line 7 is more than the total of lines 5 and 8, enter the amount overpaid... 10 44
11 Enter the amount of line 10 to be: Credited to 2026 estimated tax44 Refunded 11 0
For Refunded amount, also complete and attach Form 8050. See instructions.
Form 990-PF (2025)
Form 990-PF (2025)
Page 4
Part VI-A
Statements Regarding Activities
1a
During the tax year, did the foundation attempt to influence any national, state, or local legislation or did
Yes
No
it participate or intervene in any political campaign? ....................
1a
 
No
b
Did it spend more than $100 during the year (either directly or indirectly) for political purposes? See the instructions
for the definition.................................
1b
 
No
If the answer is "Yes" to 1a or 1b, attach a detailed description of the activities and copies of any materials
published or distributed by the foundation in connection with the activities.
c
Did the foundation file Form 1120-POL for this year?.....................
1c
 
No
d
Enter the amount (if any) of tax on political expenditures (section 4955) imposed during the year:
(1) On the foundation. $ 0(2) On foundation managers.$ 0
e
Enter the reimbursement (if any) paid by the foundation during the year for political expenditure tax imposed
on foundation managers.$ 0
2
Has the foundation engaged in any activities that have not previously been reported to the IRS?.......
2
 
No
If "Yes," attach a detailed description of the activities.
3
Has the foundation made any changes, not previously reported to the IRS, in its governing instrument, articles
of incorporation, or bylaws, or other similar instruments? If "Yes," attach a conformed copy of the changes....
3
 
No
4a
Did the foundation have unrelated business gross income of $1,000 or more during the year?.........
4a
 
No
b
If "Yes," has it filed a tax return on Form 990-T for this year?...................
4b
 
 
5
Was there a liquidation, termination, dissolution, or substantial contraction during the year?.........
5
 
No
If "Yes," attach the statement required by General Instruction T.
6
Are the requirements of section 508(e) (relating to sections 4941 through 4945) satisfied either:
round bullet By language in the governing instrument, or
round bullet By state legislation that effectively amends the governing instrument so that no mandatory directions
that conflict with the state law remain in the governing instrument? ................
6
Yes
 
7
Did the foundation have at least $5,000 in assets at any time during the year? If "Yes," complete Part II, col. (c),
and Part XIV..................................
7
Yes
 
8a
Enter the states to which the foundation reports or with which it is registered (see instructions)
MA
b
If the answer is "Yes" to line 7, has the foundation furnished a copy of Form 990-PF to the Attorney
General (or designate) of each state as required by General Instruction G? If "No," attach explanation .
8b
Yes
 
9
Is the foundation claiming status as a private operating foundation within the meaning of section 4942(j)(3)
or 4942(j)(5) for calendar year 2025 or the taxable year beginning in 2025? See the instructions for Part XIII.
If "Yes," complete Part XIII .............................
9
 
No
10
Did any persons become substantial contributors during the tax year? If "Yes," attach a schedule listing their names
and addresses. ...............................
10
 
No
11
At any time during the year, did the foundation, directly or indirectly, own a controlled entity within the
meaning of section 512(b)(13)? If "Yes," attach schedule. See instructions .............
11
 
No
12
Did the foundation make a distribution to a donor advised fund over which the foundation or a disqualified person had
advisory privileges? If "Yes," attach statement. See instructions.................
12
 
No
13
Did the foundation comply with the public inspection requirements for its annual returns and exemption application?
13
Yes
 
Website addressN/A
14
The books are in care ofJOSEPH D HAMILBURG Telephone no. (617) 488-2700

Located at16 SHAW DRIVEWAYLANDMA ZIP+401778
15
Section 4947(a)(1) nonexempt charitable trusts filing Form 990-PF in lieu of Form 1041 —check here .........
and enter the amount of tax-exempt interest received or accrued during the year ........
15
 
16 At any time during calendar year 2025, did the foundation have an interest in or a signature or other authority over YesNo
a bank, securities, or other financial account in a foreign country? .................
16   No
See the instructions for exceptions and filing requirements for FinCEN Form 114. If "Yes", enter the name of the foreign
country
Form 990-PF (2025)
Form 990-PF (2025)
Page 5
Part VI-B
Statements Regarding Activities for Which Form 4720 May Be Required
File Form 4720 if any item is checked in the "Yes" column, unless an exception applies.
Yes
No
1a
During the year did the foundation (either directly or indirectly):
(1) Engage in the sale or exchange, or leasing of property with a disqualified person? ...........
1a(1)
 
No
(2) Borrow money from, lend money to, or otherwise extend credit to (or accept it from)
a disqualified person? ..............................
1a(2)
 
No
(3) Furnish goods, services, or facilities to (or accept them from) a disqualified person? ...........
1a(3)
 
No
(4) Pay compensation to, or pay or reimburse the expenses of, a disqualified person? ............
1a(4)
 
No
(5) Transfer any income or assets to a disqualified person (or make any of either available
for the benefit or use of a disqualified person)? ......................
1a(5)
 
No
(6) Agree to pay money or property to a government official? (Exception. Check "No"
if the foundation agreed to make a grant to or to employ the official for a period
after termination of government service, if terminating within 90 days.) ...............
1a(6)
 
No
b
If any answer is "Yes" to 1a(1)–(6), did any of the acts fail to qualify under the exceptions described in Regulations
section 53.4941(d)-3 or in a current notice regarding disaster assistance? See instructions ..........
1b
 
 
c
Organizations relying on a current notice regarding disaster assistance check here ........
d
Did the foundation engage in a prior year in any of the acts described in 1a, other than excepted acts,
that were not corrected before the first day of the tax year beginning in 2025? .............
1d
 
No
2
Taxes on failure to distribute income (section 4942) (does not apply for years the foundation was a private
operating foundation defined in section 4942(j)(3) or 4942(j)(5)):
a
At the end of tax year 2025, did the foundation have any undistributed income (Part XII, lines 6d
and 6e) for tax year(s) beginning before 2025?....................
2a
Yes
 
If "Yes," list the years 20 24, 20, 20, 20
b
Are there any years listed in 2a for which the foundation is not applying the provisions of section 4942(a)(2)
(relating to incorrect valuation of assets) to the year’s undistributed income? (If applying section 4942(a)(2)
to all years listed, answer "No" and attach statement—see instructions.) ..............
2b
Yes
 
c
If the provisions of section 4942(a)(2) are being applied to any of the years listed in 2a, list the years here.
20, 20, 20, 20
3a
Did the foundation hold more than a 2% direct or indirect interest in any business enterprise at
any time during the year? ..............................
3a
 
No
b
If "Yes," did it have excess business holdings in 2025 as a result of (1) any purchase by the foundation
or disqualified persons after May 26, 1969; (2) the lapse of the 5-year period (or longer period approved
by the Commissioner under section 4943(c)(7)) to dispose of holdings acquired by gift or bequest; or (3)
the lapse of the 10-, 15-, or 20-year first phase holding period? (Use Form 4720, Schedule C, to determine
if the foundation had excess business holdings in 2025.).....................
3b
 
 
4a
Did the foundation invest during the year any amount in a manner that would jeopardize its charitable purposes?
4a
 
No
b
Did the foundation make any investment in a prior year (but after December 31, 1969) that could jeopardize its
charitable purpose that had not been removed from jeopardy before the first day of the tax year beginning in 2025? ..
4b
 
No
Form 990-PF (2025)
Form 990-PF (2025)
Page 6
Part VI-B
Statements Regarding Activities for Which Form 4720 May Be Required (continued)
5a
During the year did the foundation pay or incur any amount to:
Yes
No
(1) Carry on propaganda, or otherwise attempt to influence legislation (section 4945(e))? ..........
5a(1)
 
No
(2) Influence the outcome of any specific public election (see section 4955); or to carry
on, directly or indirectly, any voter registration drive? ....................
5a(2)
 
No
(3) Provide a grant to an individual for travel, study, or other similar purposes? .............
5a(3)
 
No
(4) Provide a grant to an organization other than a charitable, etc., organization described
in section 4945(d)(4)(A)? See instructions ........................
5a(4)
 
No
(5) Provide for any purpose other than religious, charitable, scientific, literary, or
educational purposes, or for the prevention of cruelty to children or animals? .............
5a(5)
 
No
b
If any answer is "Yes" to 5a(1)–(5), did any of the transactions fail to qualify under the exceptions described in
Regulations section 53.4945 or in a current notice regarding disaster assistance? See instructions ........
5b
 
 
c
Organizations relying on a current notice regarding disaster assistance check .........
d
If the answer is "Yes" to question 5a(4), does the foundation claim exemption from the
tax because it maintained expenditure responsibility for the grant? .................
5d
 
 
If "Yes," attach the statement required by Regulations section 53.4945–5(d).
6a
Did the foundation, during the year, receive any funds, directly or indirectly, to pay premiums on
a personal benefit contract? .............................
6a
 
No
b
Did the foundation, during the year, pay premiums, directly or indirectly, on a personal benefit contract? ....
6b
 
No
If "Yes" to 6b, file Form 8870.
7a
At any time during the tax year, was the foundation a party to a prohibited tax shelter transaction?
7a
 
No
b
If "Yes", did the foundation receive any proceeds or have any net income attributable to the transaction? .....
7b
 
 
8
Is the foundation subject to the section 4960 tax on payment(s) of more than $1,000,000 in remuneration or
excess parachute payment during the year? .........................
8
 
No
Part VII
Information About Officers, Directors, Trustees, Foundation Managers, Highly Paid Employees,
and Contractors
1 List all officers, directors, trustees, foundation managers and their compensation. See instructions
(a) Name and address (b) Title, and average
hours per week
devoted to position 		(c) Compensation
 (If not paid, enter
-0-) 		(d) Contributions to employee benefit plans and deferred compensation (e) Expense account,
other allowances
JOSEPH D HAMILBURG TRUSTEE
0.00 		0 0 0
16 SHAW DRIVE
WAYLAND,MA01778
MAURICE J HAMILBURG TRUSTEE
0.00 		0 0 0
10 DRAPER ROAD
WAYLAND,MA01778
2 Compensation of five highest-paid employees (other than those included on line 1—see instructions). If none, enter “NONE."
(a) Name and address of each employee paid more than $50,000 (b) Title, and average
hours per week
devoted to position 		(c) Compensation (d) Contributions to
employee benefit
plans and deferred
compensation 		(e) Expense account,
other allowances
NONE
Total number of other employees paid over $50,000................... 0
Form 990-PF (2025)
Form 990-PF (2025)
Page 7
Part VII
Information About Officers, Directors, Trustees, Foundation Managers, Highly Paid Employees,
and Contractors (continued)
3 Five highest-paid independent contractors for professional services (see instructions). If none, enter "NONE".
(a) Name and address of each person paid more than $50,000 (b) Type of service (c) Compensation
NONE
Total number of others receiving over $50,000 for professional services.............right arrow0
Part VIII-A
Summary of Direct Charitable Activities
List the foundation’s four largest direct charitable activities during the tax year. Include relevant statistical information such as the number of organizations and other beneficiaries served, conferences convened, research papers produced, etc. Expenses
1  
2  
3  
4  
Part VIII-B
Summary of Program-Related Investments (see instructions)
Describe the two largest program-related investments made by the foundation during the tax year on lines 1 and 2. Amount
1  
2  
All other program-related investments. See instructions.
3  
Total. Add lines 1 through 3.........................0
Form 990-PF (2025)
Form 990-PF (2025)
Page 8
Part IX
Minimum Investment Return (All domestic foundations must complete this part. Foreign foundations, see instructions.)
1
Fair market value of assets not used (or held for use) directly in carrying out charitable, etc.,
purposes:
a
Average monthly fair market value of securities...................
1a
1,604,393
b
Average of monthly cash balances.......................
1b
55,095
c
Fair market value of all other assets (see instructions)................
1c
0
d
Total (add lines 1a, 1b, and 1c).......................
1d
1,659,488
e
Reduction claimed for blockage or other factors reported on lines 1a and
1c (attach detailed explanation) .............
1e
0
2
Acquisition indebtedness applicable to line 1 assets..................
2
0
3
Subtract line 2 from line 1d.........................
3
1,659,488
4
Cash deemed held for charitable activities. Enter 1.5% (0.015) of line 3 (for greater amount, see
instructions) .............................
4
24,892
5
Net value of noncharitable-use assets. Subtract line 4 from line 3. ............
5
1,634,596
6
Minimum investment return. Enter 5% (0.05) of line 5 ................
6
81,730
Part X
Distributable Amount (see instructions) (Section 4942(j)(3) and (j)(5) private operating foundations and certain foreign organizations check here and do not complete this part.)
1
Minimum investment return from Part IX, line 6..................
1
81,730
2a
Tax on investment income for 2025 from Part V, line 5 .......
2a
1,456
b
Income tax for 2025. (This does not include the tax from Part V.) ...
2b
 
c
Add lines 2a and 2b............................
2c
1,456
3
Distributable amount before adjustments. Subtract line 2c from line 1............
3
80,274
4
Recoveries of amounts treated as qualifying distributions................
4
0
5
Add lines 3 and 4............................
5
80,274
6
Deduction from distributable amount (see instructions) .................
6
0
7
Distributable amount as adjusted. Subtract line 6 from line 5. Enter here and on Part XII, line 1 ...
7
80,274
Part XI
Qualifying Distributions (see instructions)
1
Amounts paid (including administrative expenses) to accomplish charitable, etc., purposes:
a
Expenses, contributions, gifts, etc.—total from Part I, line 26, column (d) ..........
1a
72,600
b
Program-related investments—total from Part VIII-B..................
1b
0
2
Amounts paid to acquire assets used (or held for use) directly in carrying out charitable, etc.,
purposes...............................
2
 
3
Amounts set aside for specific charitable projects that satisfy the:
a
Suitability test (prior IRS approval required)....................
3a
 
b
Cash distribution test (attach the required schedule) .................
3b
 
4
Qualifying distributions. Add lines 1a through 3b. Enter here and on Part XII, line 4. .......
4
72,600
Form 990-PF (2025)
Form 990-PF (2025)
Page 9
Part XII
Undistributed Income (see instructions)
(a)
Corpus 		(b)
Years prior to 2024 		(c)
2024 		(d)
2025
1 Distributable amount for 2025 from Part X, line 7 80,274
2 Undistributed income, if any, as of the end of 2025:
a Enter amount for 2024 only....... 76,230
b Total for prior years:2023, 20, 20 2,617
3 Excess distributions carryover, if any, to 2025:
a From 2020......  
b From 2021......  
c From 2022......  
d From 2023......  
e From 2024......  
f Total of lines 3a through e ........ 0
4Qualifying distributions for 2025 from Part
XI, line 4: $ 72,600
a Applied to 2024, but not more than line 2a 72,600
b Applied to undistributed income of prior years
(Election required—see instructions) ..... 		0
c Treated as distributions out of corpus (Election
required—see instructions) ........ 		0
d Applied to 2025 distributable amount..... 0
e Remaining amount distributed out of corpus 0
5 Excess distributions carryover applied to 2025. 0 0
(If an amount appears in column (d), the
same amount must be shown in column (a).)
6Enter the net total of each column as
indicated below:
a Corpus. Add lines 3f, 4c, and 4e. Subtract line 5 0
b Prior years’ undistributed income. Subtract
line 4b from line 2b .......... 		2,617
c Enter the amount of prior years’ undistributed
income for which a notice of deficiency has
been issued, or on which the section 4942(a)
tax has been previously assessed...... 		2,617
d Subtract line 6c from line 6b. Taxable amount
—see instructions ........... 		0
e Undistributed income for 2024. Subtract line
4a from line 2a. Taxable amount—see
instructions ............. 		3,630
f Undistributed income for 2025. Subtract
lines 4d and 5 from line 1. This amount must
be distributed in 2026 .......... 		80,274
7 Amounts treated as distributions out of
corpus to satisfy requirements imposed by
section 170(b)(1)(F) or 4942(g)(3) (Election may
be required - see instructions) ....... 		0
8 Excess distributions carryover from 2020 not
applied on line 5 or line 7 (see instructions) ... 		0
9 Excess distributions carryover to 2026.
Subtract lines 7 and 8 from line 6a ...... 		0
10 Analysis of line 9:
a Excess from 2021 ....  
b Excess from 2022 ....  
c Excess from 2023 ....  
d Excess from 2024 ....  
e Excess from 2025 ....  
Form 990-PF (2025)
Form 990-PF (2025)
Page 10
Part XIII
Private Operating Foundations (see instructions and Part VI-A, question 9)
1a If the foundation has received a ruling or determination letter that it is a private operating
foundation, and the ruling is effective for 2025, enter the date of the ruling ......
 
b Check box to indicate whether the organization is a private operating foundation described in section or
2a Enter the lesser of the adjusted net
income from Part I or the minimum
investment return from Part IX for each
year listed .......... 		Tax year Prior 3 years (e) Total
(a) 2025 (b) 2024 (c) 2023 (d) 2022
         
b 85% (0.85) of line 2a .......          
c Qualifying distributions from Part XI,
line 4 for each year listed ..... 		         
d Amounts included in line 2c not used directly
for active conduct of exempt activities .......... 		         
e Qualifying distributions made directly
for active conduct of exempt activities.
Subtract line 2d from line 2c .... 		         
3 Complete 3a, 3b, or 3c for the
alternative test relied upon:
a “Assets" alternative test—enter:
(1) Value of all assets ......          
(2) Value of assets qualifying
under section 4942(j)(3)(B)(i)		          
b “Endowment" alternative test— enter 2/3
of minimum investment return shown in
Part IX, line 6 for each year listed .. 		         
c “Support" alternative test—enter:
(1) Total support other than gross
investment income (interest,
dividends, rents, payments
on securities loans (section
512(a)(5)), or royalties) .... 		         
(2) Support from general public
and 5 or more exempt
organizations as provided in
section 4942(j)(3)(B)(iii).... 		         
(3) Largest amount of support
from an exempt organization		          
(4) Gross investment income          
Part XIV
Supplementary Information (Complete this part only if the foundation had $5,000 or more in
assets at any time during the year—see instructions.)
1Information Regarding Foundation Managers:
aList any managers of the foundation who have contributed more than 2% of the total contributions received by the foundation
before the close of any tax year (but only if they have contributed more than $5,000). (See section 507(d)(2).)
bList any managers of the foundation who own 10% or more of the stock of a corporation (or an equally large portion of the
ownership of a partnership or other entity) of which the foundation has a 10% or greater interest.
2Information Regarding Contribution, Grant, Gift, Loan, Scholarship, etc., Programs:
Check here if the foundation only makes contributions to preselected charitable organizations and does not accept
unsolicited requests for funds. If the foundation makes gifts, grants, etc. to individuals or organizations under
other conditions, complete items 2a, 2b, 2c, and 2d. See instructions
aThe name, address, and telephone number or email address of the person to whom applications should be addressed:
bThe form in which applications should be submitted and information and materials they should include:
cAny submission deadlines:
dAny restrictions or limitations on awards, such as by geographical areas, charitable fields, kinds of institutions, or other
factors:
Form 990-PF (2025)
Form 990-PF (2025)
Page 11
Part XIV
Supplementary Information (continued)
3 Grants and Contributions Paid During the Year or Approved for Future Payment
Recipient If recipient is an individual,
show any relationship to
any foundation manager
or substantial contributor
 Foundation
status of
recipient 		Purpose of grant or
contribution 		Amount
Name and address (home or business)
aPaid during the year

ACLJ

201 MARYLAND AVE NE
WASHINGTON,DC20002 		NONE   UNRESTRICTED 100

AMERICAN BATTLEFIELD TRUST

PO BOX 79535
BALTIMORE,MD21279 		NONE   UNRESTRICTED 100

AMERICAN BOXER CHARITABLE FOUNDATION

PO BOX 4194
GETTYSBURG,PA17325 		NONE   UNRESTRICTED 500

AMERICAN FARMLAND TRUST

2000 PENNSYLVANIA AVE NW SUITE 5005
WASHINGTON,DC20006 		NONE   UNRESTRICTED 100

AMERICAN HEART ASSOCIATION

7272 GREENVILLE AVE
DALLAS,TX75231 		NONE   UNRESTRICTED 100

AMERICAN RIVERS

1101 14TH STREET NW SUITE 1400
WASHINGTON,DC20005 		NONE   UNRESTRICTED 100

ANTHONY D PHUNG MEMORIAL SCHOLARSHIP

89 NORTH MAIN STREET PO BOX 02703
ATTLEBORO,MA02703 		NONE   UNRESTRICTED 200

ATLANTIC SALMON FEDERATION

PO BOX 807
CALAIS,ME04619 		NONE   UNRESTRICTED 200

BEAVER ANNUAL FUND

791 HAMMOND STREET
CHESTNUT HILL,MA02467 		NONE   UNRESTRICTED 500

BIDMC (BETH ISRAEL DEACONESS MEDICAL CENTER)

330 BROOKLINE AVE OV
BOSTON,MA02215 		NONE   DONATION PLEDGE 5,000

BOSTON BALLET

19 CLARENDON STREET
BOSTON,MA02116 		NONE   UNRESTRICTED 7,600

BRIGHAM & WOMENS HOSPITAL

116 HUNTINGTON AVENUE 3RD FLOOR
BOSTON,MA02116 		NONE   DONATION 5,000

C S P I

1250 ST NW SUITE 500
WASHINGTON,DC20005 		NONE   UNRESTRICTED 100

CATO INSTITUTE

1000 MASSACHUSETTS AVE NW
WASHINGTON,DC20001 		NONE   UNRESTRICTED 100

CO2 COALITION

1621 NORTH KENT STREET
ARLINGTON,VA22209 		NONE   UNRESTRICTED 100

CORNELL LAB OF ORNITHOLOGY

159 SAPSUCKER WOODS RD
ITHACA,NY14850 		NONE   UNRESTRICTED 100

COUSTEAU SOCIETY

PO BOX 506
ETNA,NH03750 		NONE   UNRESTRICTED 100

DANA FARBER

450 BROOKLINE AVENUE
BOSTON,MA02215 		NONE   EILEEN KRAMER KRANO'S KRUISERS 100

DANA-FARBER CANCER INSTITUTE

450 BROOKLINE AVENUE
BOSTON,MA02215 		NONE   DONATION 5,000

DUCKS UNLIMITED

4 WYMAN COURT
WINCHESTER,MA08190 		NONE   UNRESTRICTED 100

FRIENDS OF THE SMITHSONIAN

PO BOX 98096
WASHINGTON,DC20090 		NONE   UNRESTRICTED 100

GRAND CANYON CONSERVANCY

PO BOX 399
GRAND CANYON,AZ86023 		NONE   UNRESTRICTED 100

GREATER BOSTON FOOD BANK

70 S BAY AVE
BOSTON,MA02118 		NONE   UNRESTRICTED 200

HARMONY HILL

63 HARMONY HILL RD
CHEPACHET,RI02814 		NONE   UNRESTRICTED 300

HARMONY HILL

63 HARMONY HILL RD
CHEPACHET,RI02814 		NONE   UNRESTRICTED 250

HARVARD BUSINESS SCHOOL

PO BOX 412275
BOSTON,MA02241 		NONE   UNRESTRICTED 200

JIMMY FUND WALK

PO BOX 3595
BOSTON,MA02241 		NONE   UNRESTRICTED 100

JUDICIAL WATCH

425 3RD STREET SW SUITE 800
WASHINGTON,DC20024 		NONE   UNRESTRICTED 100

JUDICIAL WATCH

425 3RD STREET SW SUITE 800
WASHINGTON,DC20024 		NONE   UNRESTRICTED 100

MA AUDUBON SOCIETY

208 SOUTH GREAT ROAD
LINCOLN,MA01773 		NONE   UNRESTRICTED 100

MARINE CORPS HERITAGE FOUNDATION

1775 SEMPER FIDELIS WAY
TRIANGLE,VA22172 		NONE   UNRESTRICTED 100

MASS CHIEFS OF POLICE ASSOC FOUNDATION

353 PROVIDENCE RD
SOUTH GRAFTON,MA01560 		NONE   UNRESTRICTED 100

MASS GENERAL HOSPITAL

125 NASHUA STREET SUITE 540
BOSTON,MA02114 		NONE   DONATION 5,000

MASSACHUSETTS D A R E

251 EXCHANGE STREET
ATHOL,MA01331 		NONE   (ON BEHALF OF NORFOLK ARENA) 100

MILLIS LIONS CLUB

PO BOX 247
MILLIS,MA02054 		NONE   UNRESTRICTED 100

MUSEUM OF FINE ARTS BOSTON

465 HUNTINGTON AVE
BOSTON,MA02115 		NONE   UNRESTRICTED 3,000

NATIONAL AUDUBON SOCIETY

225 VARICK STREET 7TH FLOOR
NEW YORK,NY10014 		NONE   UNRESTRICTED 100

NATIONAL FOUNDATION FOR GUN RIGHTS

PO BOX 1776
LOVELAND,CO80539 		NONE   UNRESTRICTED 100

NATIONAL GEOGRAPHIC SOCIETY

1145 17TH STREET NW
WASHINGTON,DC20036 		NONE   UNRESTRICTED 100

NATIONAL MARINE LIFE CENTER

120 MAIN ST
BOURNE,MA02532 		NONE   UNRESTRICTED 100

NATIONAL PARK FOUNDATION

1500 K STREET NW SUITE 700
WASHINGTON,DC20005 		NONE   UNRESTRICTED 100

NATIONAL PARKS CONSERVATION ASSOC

777 6TH STREET NW SUITE 700
WASHINGTON,DC20001 		NONE   UNRESTRICTED 100

NATIONAL TRUST FOR HISTORIC PRESERVATION

2600 VIRGINIA AVENUE NW SUITE 1100
WASHINGTON,DC20037 		NONE   UNRESTRICTED 100

NATIONAL WILD TURKEY FEDERATION

770 AUGUSTA ROAD
EDGEFIELD,SC29824 		NONE   UNRESTRICTED 2,000

NATIONAL WILDLIFE FEDERATION

PO BOX 1583
MERRIFIELD,VA22116 		NONE   UNRESTRICTED 100

NEW ENGLAND BAPTIST HOSPITAL

125 PARKER HILL AVE
BOSTON,MA02120 		NONE   DONATION 10,000

NEW ENGLAND BAPTIST HOSPITAL

125 PARKER HILL AVE
BOSTON,MA02121 		NONE   UNRESTRICTED 1,500

NEW ENGLAND SKATING CLUB

PO BOX 21
NORFOLK,MA02056 		NONE   DONATION 3,000

NEWTON-WELLESLEY HOSPITAL

2014 WASHINGTON STREET
NEWTON,MA02462 		NONE   UNRESTRICTED 5,000

NOBLE & GREENOUGH SCHOOL

10 CAMPUS DR
DEDHAM,MA02026 		NONE   UNRESTRICTED 2,000

NOBLE & GREENOUGH SCHOOL

10 CAMPUS DR
DEDHAM,MA02026 		NONE   UNRESTRICTED 1,000

NOBLE & GREENOUGH SCHOOL

11 CAMPUS DR
DEDHAM,MA02027 		NONE   UNRESTRICTED 100

OCEAN CONSERVANCY

1300 19TH STREET NW 8TH FLOOR
WASHINGTON,DC20036 		NONE   UNRESTRICTED 100

OUR DAILY BREAD

15 WEST ST
MANSFIELD,MA02048 		NONE   UNRESTRICTED 250

PHEASANTS FOREVER

243 CHURCH ST
PEMBROKE,MA02359 		NONE   UNRESTRICTED 100

RAINFOREST ALLIANCE

298 FIFTH AVE 7TH FLOOR
NEW YORK,NY10001 		NONE   UNRESTRICTED 100

RUFFED GROUSE SOCIETY

451 MCCORMICK RD
CORAOPOLIS,PA15108 		NONE   UNRESTRICTED 200

SAVE THE REDWOODS LEAGUE

111 SUTTER STREET
SAN FRANCISCO,CA94104 		NONE   UNRESTRICTED 100

SIMON WIESENTHAL CENTER

1399 SOUTH ROXBURY DRIVE
LOS ANGELES,CA90035 		NONE   UNRESTRICTED 100

THE CLAREMONT INSTITUTE

682 BLACK HILLS DR
CLAREMONT,CA91711 		NONE   UNRESTRICTED 100

THE HERITAGE FOUNDATION

214 MASSACHUSETTS AVE NE
WASHINGTON,DC20002 		NONE   UNRESTRICTED 100

THE LEADERSHIP INSTITUTE

1101 N HIGHLAND STREET
ARLINGTON,VA22201 		NONE   UNRESTRICTED 100

THE MARINE MAMMAL CENTER

2000 BUNKER RD
SAUSALITO,CA94965 		NONE   UNRESTRICTED 100

THE NATURE CONSERVANCY

4245 N FAIRFAX DRIVE SUITE 100
ARLINGTON,VA22203 		NONE   UNRESTRICTED 100

THE WILDERNESS SOCIETY

45 BROMFIELD ST
BOSTON,MA02108 		NONE   UNRESTRICTED 100

TROUT UNLIMITED

1777 N KENT ST 100
ARLINGTON,VA22209 		NONE   UNRESTRICTED 100

TROUT UNLIMITED

1777 N KENT ST 100
ARLINGTON,VA22209 		NONE   UNRESTRICTED 100

TUFTS MEDICAL CENTER

PO BOX 3306
BOSTON,MA02241 		NONE   UNRESTRICTED 4,000

TUNNEL TO TOWERS

2361 HYLAN BLVD
STATEN ISLAND,NY10306 		NONE   UNRESTRICTED 100

TURNING POINT USA

4940 EAST BEVERLY ROAD
PHOENIX,AZ85044 		NONE   UNRESTRICTED 100

US HOLOCAUST MEMORIAL MUSEUM

100 RAOUL WALLENBERG PLACE SW
WASHINGTON,DC20024 		NONE   UNRESTRICTED 100

WAYLAND POLICE & FIREFIGHTERS ASSOC

38 COCHITUATE RD
WAYLAND,MA01778 		NONE   UNRESTRICTED 100

WESTSIDE BENEVOLENT CIRCLE

PO BOX 506
MANSFIELD,MA02048 		NONE   UNRESTRICTED 250

WHEATON COLLEGE

26 E MAIN ST
NORTON,MA02766 		NONE   UNRESTRICTED 250

WILDLANDS TRUST

675 LONG POND RD
PLYMOUTH,MA02360 		NONE   UNRESTRICTED 5,000

WOODS HOLE OCEANOGRAPHIC INSTITUTE

266 WOODS HOLE ROAD
WOODS HOLE,MA02543 		NONE   UNRESTRICTED 100

WORLD WILDLIFE FUND

1250 24TH STREET NW
WASHINGTON,DC20037 		NONE   UNRESTRICTED 100

YELLOWSTONE FOREVER

PO BOX 117
YELLOWSTONE NATIONAL P,WY82190 		NONE   UNRESTRICTED 100

YOSEMITE CONSERVANCY

101 MONTGOMERY STREET SUITE 1700
SAN FRANCISCO,CA94104 		NONE   UNRESTRICTED 100
Total ................................. 3a 72,600
bApproved for future payment
Total ................................. 3b 0
Form 990-PF (2025)
Form 990-PF (2025)
Page 12
Part XV-A
Analysis of Income-Producing Activities
Enter gross amounts unless otherwise indicated. Unrelated business income Excluded by section 512, 513, or 514 (e)
Related or exempt
function income
(See instructions.)
1Program service revenue: (a)
Business code 		(b)
Amount 		(c)
Exclusion code 		(d)
Amount
a
b
c
d
e
f
gFees and contracts from government agencies          
2 Membership dues and assessments ....          
3 Interest on savings and temporary cash
investments ........... 		         
4 Dividends and interest from securities ....     14 49,208  
5 Net rental income or (loss) from real estate:
aDebt-financed property......          
bNot debt-financed property.....          
6 Net rental income or (loss) from personal property          
7 Other investment income .....          
8 Gain or (loss) from sales of assets other than
inventory ............ 		    18 72,390  
9 Net income or (loss) from special events:          
10 Gross profit or (loss) from sales of inventory          
11 Other revenue:
a
b
c
d
e
12 Subtotal. Add columns (b), (d), and (e) .. 0 121,598 0
13Total. Add line 12, columns (b), (d), and (e)..................
13
121,598
(See worksheet in line 13 instructions to verify calculations.)
Part XV-B
Relationship of Activities to the Accomplishment of Exempt Purposes
Line No.
DownArrow 		Explain below how each activity for which income is reported in column (e) of Part XV-A contributed importantly to
the accomplishment of the foundation’s exempt purposes (other than by providing funds for such purposes). (See
instructions.)
Form 990-PF (2025)
Form 990-PF (2025)
Page 13
Part XVI
Information Regarding Transfers To and Transactions and Relationships With Noncharitable Exempt Organizations
1
Did the organization directly or indirectly engage in any of the following with any other organization described in section 501(c) (other than section 501(c)(3) organizations) or in section 527, relating to political organizations?
Yes
No
a
Transfers from the reporting foundation to a noncharitable exempt organization of:
(1) Cash...................................
1a(1)
 
No
(2) Other assets.................................
1a(2)
 
No
b
Other transactions:
(1) Sales of assets to a noncharitable exempt organization....................
1b(1)
 
No
(2) Purchases of assets from a noncharitable exempt organization..................
1b(2)
 
No
(3) Rental of facilities, equipment, or other assets.......................
1b(3)
 
No
(4) Reimbursement arrangements...........................
1b(4)
 
No
(5) Loans or loan guarantees.............................
1b(5)
 
No
(6) Performance of services or membership or fundraising solicitations................
1b(6)
 
No
c
Sharing of facilities, equipment, mailing lists, other assets, or paid employees..............
1c
 
No
d
If the answer to any of the above is "Yes," complete the following schedule. Column (b) should always show the fair market value
of the goods, other assets, or services given by the reporting foundation. If the foundation received less than fair market value
in any transaction or sharing arrangement, show in column (d) the value of the goods, other assets, or services received.
(a) Line No. (b) Amount involved (c) Name of noncharitable exempt organization (d) Description of transfers, transactions, and sharing arrangements
2a
Is the foundation directly or indirectly affiliated with, or related to, one or more tax-exempt organizations
described in section 501(c) (other than section 501(c)(3)) or in section 527? ...........
b
If "Yes," complete the following schedule.

(a) Name of organization (b) Type of organization (c) Description of relationship
Sign Here
Under penalties of perjury, I declare that I have examined this return, including accompanying schedules and statements, and to the best of my knowledge and belief, it is true, correct, and complete. Declaration of preparer (other than taxpayer) is based on all information of which preparer has any knowledge.
May the IRS discuss this return
with the preparer shown below?
See instructions.
Signature of officer or trustee Date Title
Paid Preparer Use Only Preparer's name Preparer's Signature Date Check if self-
employed 		PTIN
Firm's name
Firm's EIN
Firm's address


Phone no.
Form 990-PF (2025)
Additional Data


Software ID:  
Software Version:  


Form 990PF - Special Condition Description:
Special Condition Description

TY 2025 InvestmentsOtherSchedule2
Name:
JOSEPH M HAMILBURG FOUNDATION
EIN:
04-6128210
Category/ Item Listed at Cost or FMV Book Value End of Year Fair Market Value
ISHARES CORE MSCI EMERGING MARKETS AT COST 32,742 46,920
ISHARES RUSSELL 1000 VALUE AT COST 160,933 534,393
ISHARES RUSSELL 2000 VALUE AT COST 24,409 49,232
LOOMIS SAYLES GROWTH AT COST 22,434 60,471
VANGUARD DEVELOPED MARKETS INDEX FUND AT COST 27,723 30,048
WCM FOCUSED INTL GROWTH AT COST 59,299 117,133
JPMORGAN EXCHANGE TRADED FD AT COST 28,165 41,296
SCHWAB FUNDAMENTAL US LARGE COMPANY AT COST 38,190 51,128
VANGUARD SMALL CAP INDEX AT COST 1,866 2,322
VANGUARD INDEX FDS GROWTH AT COST 4,234 5,854
ISHARES CORE S&P 500 AT COST 286,811 338,360
SELECT SECTOR SPDR TRUST TECH AT COST 2,898 6,335
VANGUARD INDEX FDS VALUE AT COST 42,369 57,488
CLIFFWATER CORPORATE LENDING AT COST 250,000 245,301
CROSSHINGBRIDGE LOW DURATION AT COST 100,000 99,300
SCHWAB STRATEGIC TR FUNDAMENTAL AT COST 9,399 13,111

TY 2025 OtherExpensesSchedule
Name:
JOSEPH M HAMILBURG FOUNDATION
EIN:
04-6128210
Description Revenue and Expenses per Books Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
MASS FILING FEE 35 0   0


TY 2025 OtherProfessionalFeesSchedule
Name:
JOSEPH M HAMILBURG FOUNDATION
EIN:
04-6128210
Category Amount Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
CAPTRUST 16,560 16,560   0


TY 2025 TaxesSchedule
Name:
JOSEPH M HAMILBURG FOUNDATION
EIN:
04-6128210
Category Amount Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
FOREIGN TAXES 311 311   0
FED TAXES 779 0   0
FORM 4720 785 0   0
FED Q1 ETP 1,500 0   0