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
WILLIAM S AND BLAIR Y THOMPSON FAMILY
FOUNDATION
Number and street (or P.O. box number if mail is not delivered to street address) 21 BELLERIVE COUNTRY CLB GROUNDS DR
  Room/suite
City or town
ST LOUIS
State or province
MO
Country  
ZIP or foreign postal code
63141
A Employer identification number

27-4278915
B Telephone number (see instructions)

3145690482
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)$828,298J 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... 17,880 17,880  
5a Gross rents............      
b Net rental income or (loss)  
6a Net gain or (loss) from sale of assets not on line 10 112,532
b Gross sales price for all assets on line 6a 112,532
7 Capital gain net income (from Part IV, line 2)... 112,532
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........ 130,412 130,412  
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)....... Click to see attachment
List of Attached Documents:
// Content
4,580 2,290   2,290
c Other professional fees (attach schedule).... Click to see attachment
List of Attached Documents:
// Content
3,901 3,901   0
17 Interest...............        
18 Taxes (attach schedule) (see instructions)...        
19 Depreciation (attach schedule) and depletion...      
20 Occupancy..............        
21 Travel, conferences, and meetings.......        
22 Printing and publications..........        
23 Other expenses (attach schedule).......        
24 Total operating and administrative expenses.
Add lines 13 through 23.......... 8,481 6,191   2,290
25 Contributions, gifts, grants paid....... 106,775 106,775
26 Total expenses and disbursements. Add lines 24 and 25 ................ 115,256 6,191   109,065
27 Subtract line 26 from line 12:
a Excess of revenue over expenses and disbursements 15,156
b Net investment income (if negative, enter -0-) 124,221
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............. 16,980 24,650 24,650
2 Savings and temporary cash investments.........      
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..........      
10a Investments—U.S. and state government obligations (attach schedule) 11,554 Click to see attachment
List of Attached Documents:
// Content
56,561 		56,561
b Investments—corporate stock (attach schedule)....... 400,586 Click to see attachment
List of Attached Documents:
// Content
361,809 		543,199
c Investments—corporate bonds (attach schedule)....... 215,605 Click to see attachment
List of Attached Documents:
// Content
216,861 		203,888
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 )      
16 Total assets (to be completed by all filers—see the
instructions. Also, see page 1, item I) 644,725 659,881 828,298
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........ 0 0
27 Paid-in or capital surplus, or land, bldg., and equipment fund 0 0
28 Retained earnings, accumulated income, endowment, or other funds 644,725 659,881
29 Total net assets or fund balances (see instructions)..... 644,725 659,881
30 Total liabilities and net assets/fund balances (see instructions). 644,725 659,881
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
644,725
2
Enter amount from Part I, line 27a .....................
2
15,156
3
Other increases not included in line 2 (itemize)
3
0
4
Add lines 1, 2, and 3 ..........................
4
659,881
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
659,881
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 BBH #1692 - DETAILS AVAILABLE UPON REQUEST P   2025-12-31
b BBH #1692 - DETAILS AVAILABLE UPON REQUEST P   2025-12-31
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 143     143
b 108,777     108,777
c 3,612     3,612
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       143
b       108,777
c       3,612
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 2 112,532
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 1,727
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 1,727
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 1,727
6 Credits/Payments:
a 2025 estimated tax payments and 2024 overpayment credited to 2025 6a 581
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.............. 7 581
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 1,146
10 Overpayment. If line 7 is more than the total of lines 5 and 8, enter the amount overpaid... 10  
11 Enter the amount of line 10 to be: Credited to 2026 estimated tax   Refunded 11  
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)
MO
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 ofBLAIR Y THOMPSON Telephone no. (314) 569-0482

Located at21 BELLERIVE COUNTRY CLB GROUNDS DRSAINT LOUISMO ZIP+463141
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
BLAIR Y THOMPSON PRESIDENT
2.00 		0 0 0
21 BELLERIVE COUNTRY CLB GROUNDS DR
SAINT LOUIS,MO63141
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
810,700
b
Average of monthly cash balances.......................
1b
60,656
c
Fair market value of all other assets (see instructions)................
1c
0
d
Total (add lines 1a, 1b, and 1c).......................
1d
871,356
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
871,356
4
Cash deemed held for charitable activities. Enter 1.5% (0.015) of line 3 (for greater amount, see
instructions) .............................
4
13,070
5
Net value of noncharitable-use assets. Subtract line 4 from line 3. ............
5
858,286
6
Minimum investment return. Enter 5% (0.05) of line 5 ................
6
42,914
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
42,914
2a
Tax on investment income for 2025 from Part V, line 5 .......
2a
1,727
b
Income tax for 2025. (This does not include the tax from Part V.) ...
2b
 
c
Add lines 2a and 2b............................
2c
1,727
3
Distributable amount before adjustments. Subtract line 2c from line 1............
3
41,187
4
Recoveries of amounts treated as qualifying distributions................
4
0
5
Add lines 3 and 4............................
5
41,187
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
41,187
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
109,065
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
109,065
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 41,187
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...... 45,604
b From 2021...... 48,608
c From 2022...... 64,344
d From 2023...... 62,405
e From 2024...... 61,583
f Total of lines 3a through e ........ 282,544
4Qualifying distributions for 2025 from Part
XI, line 4: $ 109,065
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..... 41,187
e Remaining amount distributed out of corpus 67,878
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 5 350,422
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) ... 		45,604
9 Excess distributions carryover to 2026.
Subtract lines 7 and 8 from line 6a ...... 		304,818
10 Analysis of line 9:
a Excess from 2021 .... 48,608
b Excess from 2022 .... 64,344
c Excess from 2023 .... 62,405
d Excess from 2024 .... 61,583
e Excess from 2025 .... 67,878
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).)
BLAIR Y THOMPSON
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 CANCER SOCIETY

4215 LINDELL BLVD
ST LOUIS,MO63108 		NONE   CANCER RESEAARCH 300

AMERICAN HEART ASSOCIATION

460 N LINDBERGH BLVD
ST LOUIS,MO63141 		NONE   FIGHT HEART DISEASE AND STROKE THOUGH RESEARCH & INFORMATION 225

AMERICAN LUNG ASSOCIATION

7745 CARONDELET AVE
ST LOUIS,MO63105 		NONE   RESEARCH & SUPPORT FOR THOSE WITH LUNG DISEASES 150

AMERICAN RED CROSS (ST LOUIS CHAPTER)

10195 CORPORATE SQUARE DRIVE
ST LOUIS,MO63132 		NONE   TO PREVENT AND ALLEVIATE HUMAN SUFFERING IN THE FACE OF EMERGENCIES. 3,000

ASPCA

424 E 92ND ST
NEW YORK,NY10128 		NONE   RESCUE / CARE FOR ANIMALS 300

BARNES JEWISH HOSPITAL FOUNDATION

1001 HIGHLANDS PLAZA DR STE 140
ST LOUIS,MO63110 		NONE   PROVIDE MEDICAL CARE FOR NEEDY 2,000

BE LIKE BRIT FOUNDATION

66 PULMAN STREET
WORCHESTER,MA01606 		NONE   SERVE CHILDREN OF HAITI 2,500

BOYS AND GIRLS CLUB OF AMERICA

2901 N GRAND AVENUE
ST LOUIS,MO63107 		NONE   PROVIDE AFTER-SCHOOL PROGRAMS FOR YOUNG PEOPLE 500

CHURCHILL CENTER & SCHOOL

1021 MUNICIPAL CENTER DR
ST LOUIS,MO63131 		NONE   TO GIVE HIGH POTENITAL CHILDREN WITH LEARNING DISABILITIES THE FINEST, INDIVIDUALIZED, REMEDIAL EDUCATION AND THE SUPPORT THEY NEED TO ACHIEVE SUCCESS AND RETURN TO A TRADITIONAL CLASSROOM. 1,500

CONNECTICUT COLLEGE

270 MOHEGAN AVE
NEW LONDON,CT06320 		NONE   HIGHER EDUCATION PROGRAMS / SCHOLARSHIPS 2,500

CONSERVATION FEDERATION OF MISSOURI

728 W MAIN STREET
JEFFERSON CITY,MO65101 		NONE   CONSERVE MISSOURI'S WILDLIFE AND NATURAL RESOURCES 100

CORNELL LAB OF ORNITHOLOGY

159 SAPSUCKER WOODS ROAD
ITHACA,NY10006 		NONE   SUPPORT FOR THE NATURAL SCIENCES 125

DOCTORS WITHOUT BORDERS USA

40 RECTOR STREET 16TH FLOOR
NEW YORK,NY10006 		NONE   PROVIDE MEDICAL AID WHERE NEEDED THE MOST 3,000

FINCA

1201 15TH STREET NW 8TH FLOOR
WASHINGTON DC,DC20005 		NONE   FIGHTING POVERTY WITH MICROFINANCE AND SOCIAL ENTERPRISE. 500

FOOD OUTREACH INC

3117 OLIVE STREET
ST LOUIS,MO63103 		NONE   TO PROVIDE NUTRITIONAL SUPPORT AND ENHANCE THE QUALITY OF LIFE OF LOW-INCOME MEN, WOMEN AND CHILDREN LIVING WITH HIV/AIDS OR CANCER. 5,000

FORREST PARK FOREVER

5595 GRAND DRIVE
ST LOUIS,MO63112 		NONE   PROTECT AND PRESERVE FOREST PARK 500

FOXCROFT SCHOOL

PO BOX 5555
MIDDLEBURG,VA20118 		NONE   EDUCATION PROGRAMS FOR YOUNG WOMEN 5,000

GALAPAGOS CONSERVANCY

11150 FAIRFAX BOULEVAD STE 408
FAIRFAX,VA22030 		NONE   ADVANCE AND SUPPORT GALAPAGOES CONSERVATION 300

GREAT PLAINS FOUNDATION

1661 JEAGA DR
JUPITER,FL33458 		NONE   TO PROVIDE SUPPORT AND TO PERSERVE LAND AND WATER 2,000

GUIDE DOGS FOR THE BLIND INC

PO BOX 151200
SAN RAFAEL,CA949151200 		NONE   CHARITABLE 250

HABITAT FOR HUMANITY

3830 SOUTH GRAND BLVD
ST LOUIS,MO63118 		NONE   PROVIDE AFFORDABLE FAMILY HOUSING 750

HEIFER INTERNATIONAL

1 WORLD AVENUE
LITTLE ROCK,AR72202 		NONE   ENDING HUNGER 200

HUMANE SOCIETY OF MO

1201 MACKLIND AVE
ST LOUIS,MO63110 		NONE   PROVIDE HOMES AND SERVICES FOR ANIMALS 600

JANE GOODALL INSTITUTE OF USA

1120 20TH ST NW 520
WASHINGTON,DC20036 		NONE   CHARITABLE 75

LATIN SCHOOL OF CHICAGO

59 W NORTH BLVD
CHICAGO,IL60610 		NONE   EDUCATION PROGRAMS FOR STUDENTS 3,000

LYNN UNIVERSITY

3601 N MILITARY TRAIL
BOCA RATON,FL33437 		NONE   HIGHER EDUCATION PROGRAMS/SCHOLARSHIPS 2,500

MAKE A WISH FOUNDATION MISSOURI & KANSAS

13523 BARRETT PARKWAY DR STE 241
BALLWIN,MO63021 		NONE   GRANT WISHES TO CHILDREN WITH SERIOUS ILLNESS 500

MARCH OF DIMES

11829 DORSETT RD
MARYLAND HEIGHTS,MD63043 		NONE   IMPROVE HEALTH OF MOTHERS AND BABIES BY PREVENTING BIRTH DEFECTS 100

MARINE TOYS FOR TOTS FOUNDATION

18251 QUANTICO GATEWAY DRIVE
TRIANGLE,VA22172 		NONE   TO PROVIDE TOYS FOR NEEDY CHILDREN 750

MICDS

101 N WARSON ROAD
ST LOUIS,MO63124 		NONE   HIGH SCHOOL & ELEMETARY EDUCATION PROGRAMS 3,000

MISSOURI HISTORICAL SOCIETY

5700 LINDELL BLVD
ST LOUIS,MO63112 		NONE   PRESERVE HISTORY THROUGH EXHIBITS 250

MISSOURI PARKS ASSOCIATION

2108 WILLIAM ST
JEFFERSON CITY,MO65109 		NONE   SHOWCASING MISSOURI HISTORY THROUGH EXHIBITS 250

MULTIPLE SCLEROSIS ASSOC OF AMERICA (MSAA)

375 KINGS HIGHWAY NORTH SUITE B
CHERRY HILL,NJ08034 		NONE   CHARITABLE 150

MUNICIPAL THEATRE ASSOC OF ST L (MUNY PARTNERS)

1 THREATRE DR
ST LOUIS,MO63112 		NONE   CHARITABLE 1,500

MUSCULAR DYSTROPHY ASSOC

13801 RIVERPOINT DRIVE SUITE 303
MARYLAND HEIGHTS,MO63043 		NONE   RESEARCH AND SUPPORT FOR THOSE WITH DISEASE 500

NATIONAL GEOGRAPHIC SOCIETY

1145 17TH STREET NW
WASHINGTON,DC20036 		NONE   SUPPORT FOR RESEARCH IN THE NATUAL SCIENCES 100

NATIONAL PARK CONSERVATION ASSOCIATION

777 6TH ST NW STE 700
WASHINGTON,DC20001 		NONE   PROVIDE SUPPORT FOR THE PROTECTION AND ENHANCEMENTS OF NATIONAL PARLS 300

NATIONAL TRUST FOR HISTORIC PRESERVATION

2600 VIRGINIA AVE NW SUITE 1100
WASHN,DC20037 		NONE   PROTECT SIGNIFICANT HISTORICAL PLACES IN US 150

NATIONAL WILDLIFE FEDERATION

11100 WILDLIFE CENTER DRIVE
RESTON,VA20190 		NONE   PROTECT AMERICAN'S NATIONAL RESOURCES 150

OPERATION FOOD SEARCH

1644 LOTSIE BLVD
ST LOUIS,MO63132 		NONE   PROVIDE FOOD TO NEEDY 5,000

OPERATION SMILE

3641 FACULTY BOULEVAD
VIRGINIA BEACH,VA23453 		NONE   PROVIDE FOOD TO NEEDY 150

OXFAM AMERICA

226 CAUSEWAY ST 5TH FLOOR
BOSTON,MA02114 		NONE   END POVERTY 2,000

PAWS FOR PURPLE HEARTS

7404 COMMERCE WAY
RUTHER GLEN,VA22546 		NONE   IMPROVING THE LIVES OF VETERANS 500

PLANNED PARENTHOOD FEDERATION OF AMERICA

4251 FOREST PARK AVENUE
ST LOUIS,MO63108 		NONE   MANAGE INDIVIDUAL FERTILITY 500

PLANNED PARENTHOOD GREAT RIVERS

4251 FOREST PARK AVENUE
ST LOUIS,MO63108 		NONE   MANAGE INDIVIDUAL FERTILITY 2,000

PROMISE COMMUNITY HOMES

1240 DAUTEL LN
ST LOUIS,MO63146 		NONE   TO SUPPORT ADULTS WITH INTELLECTUAL AND DEVELOPMENT DISABLITIES 250

RANKEN JORDAN PEDIATRIC SPECIALITY HOSPITAL

11365 DORSETT ROAD
MARYLAND HEIGHTS,MO63043 		NONE   TO PROVIDE CONTINUUM CARE FOR MEDICALLY COMPLICATED CHILDREN AND THEIR FAMILIES 500

READING IS FUNDAMENTAL

750 FIRST ST NE
WASHINGTON,DC20002 		NONE   TO PROVIDE SUPPORT FOR CHILDREN'S LITERACY 200

SHRINERS CHILDREN'S

POST OFFICE BOX 31356
TAMPA,FL33631 		NONE   TO PROVIDE THE HIGHEST QUALITY CARE TO CHILDREN WITH NEUROMUSCULOSKELETAL CONDITIONS, BURN INJURIES AND OTHER SPECIAL HEALTH CARE WITH A COMPASSIONATE, FAMILY-CENTERED AND COLLABORATIVE CARE ENVIRONMENT. 2,500

SOUTHERN METHODIST UNIVERSITY

6425 BOAZ LANE
DALLAS,TX75202 		NONE   HIGHER EDUCATION PROGRAMS/SCHOLARSHIPS 2,000

SPECIAL OLYMPICS MISSOURI

1001 DIAMOND RIDGE STE 200
JEFFERSON CITY,MO65109 		NONE   PROVIDE ATHLETIC OPPORTUNITIES FOR INTELLECTUALLY DISABLED 500

ST JUDE CHILDREN'S RESEARCH HOSPITAL

262 DANNY THOMAS PLACE
MEMPHIS,TN38105 		NONE   TO ADVANCE CURES AND MEAS OF PREVENTION FOR PEDIATRIC CATASTROPHIC DISEASES THROUGH RESEARCH AND MEANS OF PREVENTION FOR PEDIATRIC CATASTROPHIC DISEASES THROUGH RESEARCH AND TREATMENT. 2,000

ST LOUIS AREA FOODBANK

70 CORPORATE WOODS DRIVE
ST LOUIS,MO63044 		NONE   PROVIDE FOOD TO NEEDY 5,000

ST LOUIS ART MUSEUM FOUNDATION

1 FINE ARTS DRIVE
ST LOUIS,MO63110 		NONE   PRESERVE ART / ART HISTORY THROUGH EXHIBITS 2,500

ST LOUIS CHILDREN'S HOSPITAL FOUNDATION

ONE CHILDRENS PLACE
ST LOUIS,MO63146 		NONE   PROVIDE MEDICAL CARE FOR CHILDREN 2,000

ST LOUIS CRISIS NURSERY

11710 ADMINISTRATIVE DRIVE SUITE 18
ST LOUIS,MO63146 		NONE   PREVENT CHILD ABUSE AND NEGLECT 1,500

ST LOUIS LEARNING DISABILITIES ASSOC

13537 BARRETT PARKWAY DRIVE SUITE
110
BALLWIN,MO63021 		NONE   HELP CHILDREN WITH CLASSROOM LEARNING STRUGGLES 1,000

ST LOUIS SCIENCE CENTER

PO BOX 17448
ST LOUIS,MO631787448 		NONE   CHARITABLE 300

ST LOUIS SYMPHONY ORCHESTRA

718 N GRAND BLVD
ST LOUIS,MO63103 		NONE   CHARITBALE 500

ST LOUIS ZOO FRIENDS ASSOC

GOVERNMENT DRIVE
ST LOUIS,MO63110 		NONE   ANIMAL CONSERVATION, RESEARCH, EDUCATION AND MANAGEMENT 2,500

ST LUKE'S HOSPITAL

232 S WOODS MILL ROAD
CHESTERFIELD,MO63017 		NONE   PROVIDE MEDICAL CARE FOR CHILDREN 500

ST PATRICKS CENTER

800 N TUCKER
ST LOUIS,MO63101 		NONE   PROVIDES ASSISTANCE TO HOMELESS PEOPLE 1,000

SUNSHINE MINISTRIES

PO BOX 66880
ST LOUIS,MO63166 		NONE   PROVIDE SERVICES TO POOR AND NEEDY 300

SUSAN G KOMEN

5005 LBJ FREEWAY STE 250
DALLAS,TX75244 		NONE   SAVE LIVES AND FIND CURE FOR BREAST CANCER 500

SUSTENTARE INC

24 GRAND BAY ESTATES CIRCLE
KEY BIZCAYNE,FL33149 		NONE   WILDLIFE PRESERVATION AND PROTECTION 2,000

THE BACKSTOPPERS

10411 CLAYON ROAD
ST LOUIS,MO63131 		NONE   TO PROVIDE SUPPORT FOR FAMILIES OF FIRST RESPONDERS 500

THE NATURE CONSERVANCY

4245 N FAIRFAX DRIVE SUITE 100
ARLINGTON,VA22030 		NONE   CONSERVE LAND AND WATER 100

THE REPERTORY THEATRE OF ST LOUIS

130 EDGAR ROAD
WEBSTER GROVES,MO63119 		NONE   CHARITABLE 400

THE SALVATION ARMY

3637 BROADWAY
KANSAS CITY,MO64111 		NONE   TO MEET HUMAN NEEDS THROUGH JESUS CHRIST. 1,500

THE WATER PROJECT

PO BOX 3353
CONCORD,NH03302 		NONE   PROVIDE WATER TO NEEDY 2,000

UNICEF USA

125 MAIDEN LANE
NEW YORK,NY10038 		NONE   TO HELP CHILDREN AND YOUNG PEOPLE AROUND THE WORLD. 250

UNITED WAY OF GREATER ST LOUIS

910 N 11TH STREET
ST LOUIS,MO63101 		NONE   RAISE FUNDS FOR LOCAL CHARITIES 10,000

USO

LAMBER AIRPORT PO BOX 10367
ST LOUIS,MO63145 		NONE   LIFT SPIRITS OF AMERICAN TROOPS 500

WASHINGTON UNIVERSITY

CAMPUS BOX 1082 ONE BROOKINGS DRIVE
ST LOUIS,MO63130 		NONE   HIGHER EDUCATION PROGRAMS / SCHOLARSHIPS 3,000

WILDLIFE RESCUE CENTER

1128 NEW BALLWIN ROAD
BALLWIN,MO63021 		NONE   RESCUE/CARE FOR WILD ANIMALS 300

WOLRD WILDLIFE FUND

1250 24TH STREET NW
WASHINGTON,DC20037 		NONE   PROTECT AND PRESERVE WILD ANIMALS 500

WORLD BIRD SANCTUARY

125 BALD EAGLE RIDGE ROAD
VALLEY PARK,MO63088 		NONE   RESCUE / CARE FOR BIRDS 500

WOUNDED WARRIOR PROJECT

4899 BELFORT ROAD SUITE 300
JACKSONVILLE,FL32256 		NONE   ASSIST WOUNDED ARMED SERVICE MEMBERS 1,000

HUMANE WORLD FOR ANIMALS

1255 23RD STREET NW SUITE 450
WASHINGTON,DC20037 		NONE   CHARITABLE 150

NATIONAL AUDUBON SOCIETY

225 VARICK STREET 7TH FLOOR
NEW YORK,NY10014 		NONE   CHARITABLE 50

NINE PBS

3655 OLIVE STREET
ST LOUIS,MO63108 		NONE   CHARITABLE 1,000

ST LOUIS PUBLIC LIBRARY FOUNDATION

1415 OLIVE ST
ST LOUIS,MO63101 		NONE   CHARITABLE 100

ST LOUIS PUBLIC RADIO

PO BOX 843048
KANSAS CITY,MO64184 		NONE   CHARITABLE 100

USA LACROSSE

2 LOVETON CIRCLE
SPARKS,MD21152 		NONE   CHARITABLE 50

100 NEEDIEST CASES

PO BOX 955926
ST LOUIS,MO63195 		NONE   CHARITABLE 2,500
Total ................................. 3a 106,775
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 17,880  
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 ............ 		    18 112,532  
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) .. 0 130,412 0
13Total. Add line 12, columns (b), (d), and (e)..................
13
130,412
(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:
WILLIAM S AND BLAIR Y THOMPSON FAMILY
 
FOUNDATION
EIN:
27-4278915
Category Amount Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
ACCOUNTING FEES 4,580 2,290   2,290

TY 2025 InvestmentsCorpBondsSchedule
Name:
WILLIAM S AND BLAIR Y THOMPSON FAMILY
 
FOUNDATION
EIN:
27-4278915
Name of Bond End of Year Book Value End of Year Fair Market Value
BBH 216,861 203,888

TY 2025 InvestmentsCorpStockSchedule
Name:
WILLIAM S AND BLAIR Y THOMPSON FAMILY
 
FOUNDATION
EIN:
27-4278915
Name of Stock End of Year Book Value End of Year Fair Market Value
BBH 361,809 543,199

TY 2025 InvestmentsGovtObligationsSch
Name:
WILLIAM S AND BLAIR Y THOMPSON FAMILY
 
FOUNDATION
EIN:
27-4278915
US Government Securities - End of Year Book Value:

56,561
US Government Securities - End of Year Fair Market Value:

56,561
State & Local Government Securities - End of Year Book Value:


0
State & Local Government Securities - End of Year Fair Market Value:


0


TY 2025 OtherProfessionalFeesSchedule
Name:
WILLIAM S AND BLAIR Y THOMPSON FAMILY
 
FOUNDATION
EIN:
27-4278915
Category Amount Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
INVESTMENT FEES 3,901 3,901   0