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
THE REGENSTEIN FOUNDATION
 
Number and street (or P.O. box number if mail is not delivered to street address) 225 W WACKER DRIVE SUITE 1500
  Room/suite
City or town
CHICAGO
State or province
IL
Country  
ZIP or foreign postal code
606061235
A Employer identification number

36-3152531
B Telephone number (see instructions)

3129171833
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)$77,465,011J 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 103 103  
4 Dividends and interest from securities... 838,095 836,980  
5a Gross rents............      
b Net rental income or (loss)  
6a Net gain or (loss) from sale of assets not on line 10 4,942,189
b Gross sales price for all assets on line 6a 16,921,021
7 Capital gain net income (from Part IV, line 2)... 4,942,190
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)....... Click to see attachment
List of Attached Documents:
// Content
-215,733 33,569 0
12 Total. Add lines 1 through 11........ 5,564,654 5,812,842 0
Operating and Administrative Expenses 13 Compensation of officers, directors, trustees, etc. 144,209 72,104 0 72,105
14 Other employee salaries and wages......        
15 Pension plans, employee benefits.......        
16a Legal fees (attach schedule)......... Click to see attachment
List of Attached Documents:
// Content
30,464 6,093 0 24,371
b Accounting fees (attach schedule)....... Click to see attachment
List of Attached Documents:
// Content
62,453 49,962 0 12,491
c Other professional fees (attach schedule).... Click to see attachment
List of Attached Documents:
// Content
200,618 200,618 0 0
17 Interest...............        
18 Taxes (attach schedule) (see instructions)... Click to see attachment
List of Attached Documents:
// Content
156,026 5,606 0 15
19 Depreciation (attach schedule) and depletion...      
20 Occupancy..............        
21 Travel, conferences, and meetings....... 2,145 1,073 0 1,072
22 Printing and publications..........        
23 Other expenses (attach schedule)....... Click to see attachment
List of Attached Documents:
// Content
36,027 28,635 0 6,147
24 Total operating and administrative expenses.
Add lines 13 through 23.......... 631,942 364,091 0 116,201
25 Contributions, gifts, grants paid....... 11,555,000 6,750,000
26 Total expenses and disbursements. Add lines 24 and 25 ................ 12,186,942 364,091 0 6,866,201
27 Subtract line 26 from line 12:
a Excess of revenue over expenses and disbursements -6,622,288
b Net investment income (if negative, enter -0-) 5,448,751
c Adjusted net income (if negative, enter -0-)... 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............. 2,456,335 1,567,462 1,567,462
2 Savings and temporary cash investments......... 5,667,825 1,634,072 1,634,072
3 Accounts receivable  
Less: allowance for doubtful accounts        
4 Pledges receivable  
Less: allowance for doubtful accounts        
5 Grants receivable.................      
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.......... 109,729 65,599 65,599
10a Investments—U.S. and state government obligations (attach schedule)      
b Investments—corporate stock (attach schedule)....... 66,570,099 Click to see attachment
List of Attached Documents:
// Content
74,182,994 		74,182,994
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)..........      
14 Land, buildings, and equipment: basis  
Less: accumulated depreciation (attach schedule)        
15 Other assets (describe ) Click to see attachment
List of Attached Documents:
// Content
22,246 		Click to see attachment
List of Attached Documents:
// Content
14,884 		Click to see attachment
List of Attached Documents:
// Content
14,884
16 Total assets (to be completed by all filers—see the
instructions. Also, see page 1, item I) 74,826,234 77,465,011 77,465,011
Liabilities 17 Accounts payable and accrued expenses.......... 37,520 65,500
18 Grants payable................. 23,533,101 27,647,170
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 ) Click to see attachment
List of Attached Documents:
// Content
752,863 		Click to see attachment
List of Attached Documents:
// Content
679,227
23 Total liabilities (add lines 17 through 22)......... 24,323,484 28,391,897
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........... 50,502,750 49,073,114
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........    
27 Paid-in or capital surplus, or land, bldg., and equipment fund    
28 Retained earnings, accumulated income, endowment, or other funds    
29 Total net assets or fund balances (see instructions)..... 50,502,750 49,073,114
30 Total liabilities and net assets/fund balances (see instructions). 74,826,234 77,465,011
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
50,502,750
2
Enter amount from Part I, line 27a .....................
2
-6,622,288
3
Other increases not included in line 2 (itemize) Click to see attachment
List of Attached Documents:
// Content
3
5,192,652
4
Add lines 1, 2, and 3 ..........................
4
49,073,114
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
49,073,114
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 PUBLICLY TRADED SECURITIES      
b PUBLICLY TRADED SECURITIES      
c ARISTIDES FUND QP, LP K-1 P    
d ARISTIDES FUND QP, LP K-1 P    
e AP ENERGY INFRASTRUCTURE FUND, LLC K-1 P    
AP ENERGY INFRASTRUCTURE FUND, LLC K-1 P    
AP ENERGY INFRASTRUCTURE FUND, LLC K-1 P    
AP ENERGY INFRASTRUCTURE FUND, LLC K-1 P    
POPLAR INTERNATIONAL PARTNERS LP P    
(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 4,507,920   3,148,589 1,359,331
b 9,920,395   7,155,676 2,764,719
c     167,601 -167,601
d 423,858     423,858
e 177,990     177,990
266,282     266,282
    6,965 -6,965
      0
1,624,576   1,500,000 124,576
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       1,359,331
b       2,764,719
c       -167,601
d       423,858
e       177,990
      266,282
      -6,965
      0
      124,576
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 4,942,190
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 4,134,439
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 75,738
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 75,738
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 75,738
6 Credits/Payments:
a 2025 estimated tax payments and 2024 overpayment credited to 2025 6a 22,607
b Exempt foreign organizations—tax withheld at source...... 6b 0
c Tax paid with application for extension of time to file (Form 8868)... 6c 75,000
d Backup withholding erroneously withheld .......... 6d 0
7 Total credits and payments. Add lines 6a through 6d.............. 7 97,607
8 Enter any penalty for underpayment of estimated tax. Check here if Form 2220 is attached. Click to see attachment
List of Attached Documents:
// Content
8 2,339
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 19,530
11 Enter the amount of line 10 to be: Credited to 2026 estimated tax19,530 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
Yes
 
b
If "Yes," has it filed a tax return on Form 990-T for this year?...................
4b
Yes
 
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)
IL
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 ofPATRICIA WALLIES Telephone no. (312) 917-1833

Located at225 W WACKER DRIVE SUITE 1500CHICAGOIL ZIP+4606061235
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
 
No
If "Yes," list the years 20, 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
 
 
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
SUSAN REGENSTEIN CHAIRMAN & PRESIDENT
10.00 		0 0 0
225 W WACKER DRIVE SUITE 1500
CHICAGO,IL60606
JOSEPH REGENSTEIN III SECRETARY/TREASURER
5.00 		0 0 0
225 W WACKER DRIVE SUITE 1500
CHICAGO,IL60606
MARSHALL FIELD V DIRECTOR
5.00 		0 0 0
225 W WACKER DRIVE SUITE 1500
CHICAGO,IL60606
F OLIVER NICKLIN JR DIRECTOR
5.00 		0 0 0
225 W WACKER DRIVE SUITE 1500
CHICAGO,IL60606
PATRICIA WALLIES EXECUTIVE DIRECTOR
40.00 		144,209 0 0
225 W WACKER DRIVE SUITE 1500
CHICAGO,IL60606
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
THE NORTHERN TRUST CO INVESTMENT 200,618
50 S LASALLE ST
CHICAGO,IL60675
PW CONSULTING INC CONSULTING 144,209
1408 BLACKTHORN DRIVE
GLENVIEW,IL60025
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
70,060,727
b
Average of monthly cash balances.......................
1b
6,226,004
c
Fair market value of all other assets (see instructions)................
1c
674,618
d
Total (add lines 1a, 1b, and 1c).......................
1d
76,961,349
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
76,961,349
4
Cash deemed held for charitable activities. Enter 1.5% (0.015) of line 3 (for greater amount, see
instructions) .............................
4
1,154,420
5
Net value of noncharitable-use assets. Subtract line 4 from line 3. ............
5
75,806,929
6
Minimum investment return. Enter 5% (0.05) of line 5 ................
6
3,790,346
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
3,790,346
2a
Tax on investment income for 2025 from Part V, line 5 .......
2a
75,738
b
Income tax for 2025. (This does not include the tax from Part V.) ...
2b
 
c
Add lines 2a and 2b............................
2c
75,738
3
Distributable amount before adjustments. Subtract line 2c from line 1............
3
3,714,608
4
Recoveries of amounts treated as qualifying distributions................
4
0
5
Add lines 3 and 4............................
5
3,714,608
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
3,714,608
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
6,866,201
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
6,866,201
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 3,714,608
2 Undistributed income, if any, as of the end of 2025:
a Enter amount for 2024 only....... 0
b Total for prior years:20 , 20, 20 0
3 Excess distributions carryover, if any, to 2025:
a From 2020...... 1,920,756
b From 2021...... 7,170,461
c From 2022......  
d From 2023...... 7,155,688
e From 2024...... 962,622
f Total of lines 3a through e ........ 17,209,527
4Qualifying distributions for 2025 from Part
XI, line 4: $ 6,866,201
a Applied to 2024, but not more than line 2a 0
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..... 3,714,608
e Remaining amount distributed out of corpus 3,151,593
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 20,361,120
b Prior years’ undistributed income. Subtract
line 4b from line 2b .......... 		0
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...... 		0
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 ............. 		0
f Undistributed income for 2025. Subtract
lines 4d and 5 from line 1. This amount must
be distributed in 2026 .......... 		0
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) ... 		1,920,756
9 Excess distributions carryover to 2026.
Subtract lines 7 and 8 from line 6a ...... 		18,440,364
10 Analysis of line 9:
a Excess from 2021 .... 7,170,461
b Excess from 2022 ....  
c Excess from 2023 .... 7,155,688
d Excess from 2024 .... 962,622
e Excess from 2025 .... 3,151,593
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

AMERICAN RED CROSS

431 18TH STREET NW
WASHINGTON,DC20006 		NONE   OPERATIONAL SUPPORT 50,000

ANN & ROBERT H LURIE CHILDREN'S HOSPITAL

225 EAST CHICAGO AVE
CHICAGO,IL60611 		NONE   OPERATIONAL SUPPORT 1,060,000

ART INSTITUE OF CHICAGO

111 S MICHIGAN AVE
CHICAGO,IL60603 		NONE   OPERATIONAL SUPPORT 25,000

CHICAGO BOTANIC GARDEN

1000 LAKE COOK RD
GLENCOE,IL60022 		NONE   OPERATIONAL SUPPORT 550,000

CHICAGO SYMPHONY ORCHESTRA

220 S MICHIGAN AVE
CHICAGO,IL60604 		NONE   OPERATIONAL SUPPORT 50,000

CHICAGO ZOOLOGICAL SOCIETY

3300 GOLF RD
BROOKFIELD,IL60513 		NONE   OPERATIONAL SUPPORT 90,000

CHILDREN OF ABRAHAM COALITION

3610 DUNDEE RD
NORTHBROOK,IL60062 		NONE   OPERATIONAL SUPPORT 5,000

CONSERVANCY OF SOUTHWEST FLORIDA

1450 MERRIHUE DRIVE
NAPLES,FL34106 		NONE   OPERATIONAL SUPPORT 10,000

FIELD MUSEUM

1400 S LAKE SHORE DRIVE
CHICAGO,IL60605 		NONE   OPERATIONAL SUPPORT 100,000

GREATER CHICAGO FOOD DEPOSITORY

400 W ANN LURIE PLACE
CHICAGO,IL60632 		NONE   OPERATIONAL SUPPORT 25,000

GULFSHORE PLAYHOUSE

755 8TH AVE S
NAPLES,FL34102 		NONE   OPERATIONAL SUPPORT 225,000

HOLOCAUST MUSEUM OF SOUTHWEST

4760 TAMIAMI TRAIL NORTH
NAPLES,FL34103 		NONE   OPERATIONAL SUPPORT 5,000

KATZ RHEUMATOLOGY RESEARCH EDUCAION FUND

3379 PEACHTREE ROAD NORTHEAST SUITE
700
ATLANTA,GA30326 		NONE   OPERATIONAL SUPPORT 5,000

LINCOLN PARK ZOO

PO BOX 14903 CANNON
CHICAGO,IL60614 		NONE   OPERATIONAL SUPPORT 240,000

LUMEN CHRISTI INSTITUTE

1220 E 58TH ST
CHICAGO,IL60637 		NONE   OPERATIONAL SUPPORT 55,000

MILLENNIUM PARK FOUNDATION

201 E RANDOLPH ST
CHICAGO,IL60601 		NONE   OPERATIONAL SUPPORT 5,000

NAPLES BOTANICAL GARDEN

4820 BAYSHORE DR
NAPLES,FL34112 		NONE   OPERATIONAL SUPPORT 5,000

NAPLES COMMUNITY HOSPITAL

PO BOX 413029
NAPLES,FL341013029 		NONE   OPERATIONAL SUPPORT 100,000

NAPLES ZOO

1590 GOODLETTE ROAD N
NAPLES,FL34102 		NONE   OPERATIONAL SUPPORT 90,000

NORTHWESTERN MEMORIAL FOUNDATION

676 CLAIR STREET
CHICAGO,IL60611 		NONE   OPERATIONAL SUPPORT 150,000

PARLIAMENT OF WORLD'S RELIGIONS

4422 N RAVENSWOOD AVE
CHICAGO,IL60640 		NONE   OPERATIONAL SUPPORT 15,000

ARTIS - NAPLES

5833 PELICAN BAY
NAPLES,FL34108 		NONE   OPERATIONAL SUPPORT 25,000

RUSH UNIVERSITY MEDICAL CENTER

1725 WEST HARRISON
CHICAGO,IL60612 		NONE   OPERATIONAL SUPPORT 1,020,000

SERBS FOR SERBS

PO BOX 34206
CHICAGO,IL60634 		NONE   OPERATIONAL SUPPORT 5,000

SHEDD AQUARIUM

1200 SOUTH LAKE SHORE DR
CHICAGO,IL60605 		NONE   OPERATIONAL SUPPORT 1,750,000

SHIRLEY RYAN ABILITY LAB

355 EAST ERIE
CHICAGO,IL60611 		NONE   OPERATIONAL SUPPORT 1,055,000

THE SERVICE CLUB OF CHICAGO

233 EAST ERIE STREET
CHICAGO,IL60611 		NONE   OPERATIONAL SUPPORT 10,000

THE WASTESHED

914 N CALIFORNIA 1F
CHICAGO,IL60622 		NONE   OPERATIONAL SUPPORT 10,000

UNIVERSITY OF ILLINOIS

1200 W HARRISON ST
CHICAGO,IL60608 		NONE   OPERATIONAL SUPPORT 15,000
Total ................................. 3a 6,750,000
bApproved for future payment

FOR AUTISTIC KIDS FOUNDATION
1200 N MILWAUKEE AVE
GLENVIEW,IL60025 		NONE   OPERATIONAL SUPPORT 10,000

LINCOLN PARK ZOO
PO BOX 14903 CANNON
CHICAGO,IL60614 		NONE   OPERATIONAL SUPPORT 10,000,000

SMITHSONIAN NATIONAL ZOOLOGICAL
3001 CONNETICUT AVE NW
WASHINGTON,DC20008 		NONE   OPERATIONAL SUPPORT 70,000
Total ................................. 3b 10,080,000
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 ........... 		    14 103  
4 Dividends and interest from securities .... 900099 1,115 14 836,980  
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 .....     18 33,569  
8 Gain or (loss) from sales of assets other than
inventory ............ 		900099 -1 18 4,942,190  
9 Net income or (loss) from special events:          
10 Gross profit or (loss) from sales of inventory          
11 Other revenue:
aAP ENERGY INFRASTRUCTURE 		900099 -249,302      
b
c
d
e
12 Subtotal. Add columns (b), (d), and (e) .. -248,188 5,812,842 0
13Total. Add line 12, columns (b), (d), and (e)..................
13
5,564,654
(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 AccountingFeesSchedule
Name:
THE REGENSTEIN FOUNDATION
EIN:
36-3152531
Category Amount Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
ACCOUNTING AND AUDIT FEES 62,453 49,962 0 12,491

TY 2025 InvestmentsCorpStockSchedule
Name:
THE REGENSTEIN FOUNDATION
EIN:
36-3152531
Name of Stock End of Year Book Value End of Year Fair Market Value
CORPORATE STOCK 74,182,994 74,182,994

TY 2025 LegalFeesSchedule
Name:
THE REGENSTEIN FOUNDATION
EIN:
36-3152531
Category Amount Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
LEGAL FEES 30,464 6,093 0 24,371


TY 2025 OtherAssetsSchedule
Name:
THE REGENSTEIN FOUNDATION
EIN:
36-3152531
Description Beginning of Year - Book Value End of Year - Book Value End of Year - Fair Market Value
ACCRUED INTERST AND DIVIDENDS 22,246 14,884 14,884


TY 2025 OtherExpensesSchedule
Name:
THE REGENSTEIN FOUNDATION
EIN:
36-3152531
Description Revenue and Expenses per Books Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
OFFICE SUPPLIES 8,249 6,599 0 1,650
DUES & SUBSCRIPTIONS 587 0 0 587
INSURANCE 8,545 6,836 0 1,709
TECHNOLOGY EXPENSES 4,000 2,000 0 2,000
OTHER ARISTIDES FUND QP LP 165 165 0 0
OTHER AP ENERGY INFRASTRUCTURE 14,481 13,035 0 201


TY 2025 OtherIncomeSchedule2
Name:
THE REGENSTEIN FOUNDATION
EIN:
36-3152531
Description Revenue And Expenses Per Books Net Investment Income Adjusted Net Income
OTHER INCOME 1,456 1,456 0
ARISTIDES FUND QP, LP 5,212 5,212 0
AP ENERGY INFRASTRUCTURE 26,901 26,901 0
AP ENERGY INFRASTRUCTURE -249,302   0


TY 2025 OtherIncreasesSchedule
Name:
THE REGENSTEIN FOUNDATION
EIN:
36-3152531
Description Amount
UNREALIZED GAIN/LOSS 4,511,721
PLEDGES PAYABLE PRESENT VALUE ADJUSTMENT 680,931


TY 2025 OtherLiabilitiesSchedule
Name:
THE REGENSTEIN FOUNDATION
EIN:
36-3152531
Description Beginning of Year - Book Value End of Year - Book Value
DEFERRED FEDERAL EXCISE TAX 528,213 603,570
ACCRUED FEDERAL EXCISE TAX 65,679 75,657
DUE TO BROKERS 158,971 0


TY 2025 OtherProfessionalFeesSchedule
Name:
THE REGENSTEIN FOUNDATION
EIN:
36-3152531
Category Amount Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
INVESTMENT FEES 200,618 200,618 0 0


TY 2025 TaxesSchedule
Name:
THE REGENSTEIN FOUNDATION
EIN:
36-3152531
Category Amount Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
CURRENT FEDERAL EXCISE TAX 73,592 0 0 0
CURRENT FEDERAL INCOME TAX 517 0 0 0
CURRENT STATE INCOME TAX 65 0 0 15
DEFERRED FEDERAL EXCISE TAX 75,357 0 0 0
FOREIGN TAXES PAID 5,606 5,606 0 0
PRIOR YEAR FEDERAL AND STATE TAX 889 0 0 0