Form990-PF

Department of the Treasury
Internal Revenue Service

Return of Private Foundation
or Section 4947(a)(1) Trust Treated as Private Foundation
right arrowDo not enter social security numbers on this form as it may be made public.
right arrowGo to www.irs.gov/Form990PF for instructions and the latest information.
OMB No. 1545-0047
2024
Open to Public Inspection
For calendar year 2024, or tax year beginning 01-01-2024 , and ending 12-31-2024
Name of foundation
SONTAG FOUNDATION
 
Number and street (or P.O. box number if mail is not delivered to street address)816 A1A NORTH 201
  Room/suite
City or town, state or province, country, and ZIP or foreign postal code
PONTE VEDRA BEACH, FL32082
A Employer identification number

59-3634325
B Telephone number (see instructions)

(904) 273-8755
C right arrow
G Check all that apply:

D 1. Foreign organizations, check here............. right arrow
2. Foreign organizations meeting the 85%
test, check here and attach computation ... right arrow
E right arrow
H Check type of organization:
F right arrow
I Fair market value of all assets at end
of year (from Part II, col. (c),
line 16)right arrow$223,286,343J 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) 12,178,578
2 Check right arrow.............
3 Interest on savings and temporary cash investments      
4 Dividends and interest from securities... 2,933,702 2,933,702  
5a Gross rents............      
b Net rental income or (loss)  
6a Net gain or (loss) from sale of assets not on line 10 9,495,842
b Gross sales price for all assets on line 6a 15,202,326
7 Capital gain net income (from Part IV, line 2)... 9,495,842
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........ 24,608,122 12,429,544  
Operating and Administrative Expenses 13 Compensation of officers, directors, trustees, etc. 72,000 0   72,000
14 Other employee salaries and wages...... 773,308 157,992   615,316
15 Pension plans, employee benefits....... 80,768 13,011   67,757
16a Legal fees (attach schedule)......... Click to see attachment
List of Attached Documents:
// Content
10,874 2,188   8,686
b Accounting fees (attach schedule)....... Click to see attachment
List of Attached Documents:
// Content
15,075 7,537   7,538
c Other professional fees (attach schedule).... Click to see attachment
List of Attached Documents:
// Content
411,952 411,952   0
17 Interest...............        
18 Taxes (attach schedule) (see instructions)... Click to see attachment
List of Attached Documents:
// Content
229,255 188,404   40,851
19 Depreciation (attach schedule) and depletion...      
20 Occupancy.............. 32,542 6,670   25,872
21 Travel, conferences, and meetings....... 652,533 0   652,533
22 Printing and publications..........        
23 Other expenses (attach schedule)....... Click to see attachment
List of Attached Documents:
// Content
612,432 370,106   242,326
24 Total operating and administrative expenses.
Add lines 13 through 23.......... 2,890,739 1,157,860   1,732,879
25 Contributions, gifts, grants paid....... 7,153,332 7,153,332
26 Total expenses and disbursements. Add lines 24 and 25 10,044,071 1,157,860   8,886,211
27 Subtract line 26 from line 12:
a Excess of revenue over expenses and disbursements 14,564,051
b Net investment income (if negative, enter -0-) 11,271,684
c Adjusted net income (if negative, enter -0-)...  
For Paperwork Reduction Act Notice, see instructions.
Cat. No. 11289X Form 990-PF (2024)
Form 990-PF (2024)
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............. 167,969 231,531 231,531
2 Savings and temporary cash investments......... 6,783,506 4,023,216 4,023,216
3 Accounts receivable right arrow  
Less: allowance for doubtful accounts right arrow        
4 Pledges receivable right arrow  
Less: allowance for doubtful accounts right arrow        
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) right arrow  
Less: allowance for doubtful accounts right arrow        
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)....... 11,720,661 Click to see attachment
List of Attached Documents:
// Content
23,587,262 		27,375,537
c Investments—corporate bonds (attach schedule)....... 2,627,185 Click to see attachment
List of Attached Documents:
// Content
7,703,877 		7,617,958
11 Investments—land, buildings, and equipment: basis right arrow  
Less: accumulated depreciation (attach schedule) right arrow        
12 Investments—mortgage loans.............      
13 Investments—other (attach schedule).......... 166,204,415 Click to see attachment
List of Attached Documents:
// Content
166,002,162 		166,002,162
14 Land, buildings, and equipment: basis right arrow18,000,000
Less: accumulated depreciation (attach schedule) right arrow   0 18,000,000 18,000,000
15 Other assets (describe right arrow) Click to see attachment
List of Attached Documents:
// Content
61,669 		Click to see attachment
List of Attached Documents:
// Content
35,939 		Click to see attachment
List of Attached Documents:
// Content
35,939
16 Total assets (to be completed by all filers—see the
instructions. Also, see page 1, item I) 187,565,405 219,583,987 223,286,343
Liabilities 17 Accounts payable and accrued expenses.......... 18,226 4,664
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 right arrow) Click to see attachment
List of Attached Documents:
// Content
127,971 		Click to see attachment
List of Attached Documents:
// Content
139,219
23 Total liabilities (add lines 17 through 22)......... 146,197 143,883
Net Assets or Fund Balances Foundations that follow FASB ASC 958, check here right arrow
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 right arrow
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 187,419,208 219,440,104
29 Total net assets or fund balances (see instructions)..... 187,419,208 219,440,104
30 Total liabilities and net assets/fund balances (see instructions). 187,565,405 219,583,987
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
187,419,208
2
Enter amount from Part I, line 27a .....................
2
14,564,051
3
Other increases not included in line 2 (itemize) right arrowClick to see attachment
List of Attached Documents:
// Content
3
17,456,845
4
Add lines 1, 2, and 3 ..........................
4
219,440,104
5
Decreases not included in line 2 (itemize) right arrow
5
0
6
Total net assets or fund balances at end of year (line 4 minus line 5)—Part II, column (b), line 29 .
6
219,440,104
Form 990-PF (2024)
Form 990-PF (2024)
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 FROM PARTNERSHIPS FLOW-THRU P   2024-12-31
b FROM PARTNERSHIPS FLOW-THRU P   2024-12-31
c CAPITAL GAIN DISTRIBUTIONS P   2024-12-31
d US BANK LT NONCOVERED P   2024-12-31
e MERRILL LYNCH #02190 ST COVERED P   2024-12-31
MERRILL LYNCH #02190 LT COVERED P   2024-12-31
1256 FROM JPMORGAN CHASE BANK P   2024-12-31
1256 FROM JPMORGAN CHASE BANK P   2024-12-31
MODIFI BIOSCIENCES P   2024-11-27
1256 FROM PARTNERSHIPS FLOW-THRU P   2024-12-31
1256 FROM PARTNERSHIPS FLOW-THRU P   2024-12-31
(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 375,550     375,550
b 6,539,913     6,539,913
c 618,164     618,164
d 6,012,480   5,027,615 984,865
e 20,404   18,387 2,017
116,774   115,526 1,248
90,584     90,584
135,876     135,876
656,101   544,956 111,145
254,592     254,592
381,888     381,888
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       375,550
b       6,539,913
c       618,164
d       984,865
e       2,017
      1,248
      90,584
      135,876
      111,145
      254,592
      381,888
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 9,495,842
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 right arrow 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) 1 156,676
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........................... 3 156,676
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- ..... 5 156,676
6 Credits/Payments:
a 2024 estimated tax payments and 2023 overpayment credited to 2024 6a 8,046
b Exempt foreign organizations—tax withheld at source...... 6b 0
c Tax paid with application for extension of time to file (Form 8868)... 6c 146,500
d Backup withholding erroneously withheld .......... 6d 0
7 Total credits and payments. Add lines 6a through 6d.............. 7 154,546
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
8 772
9 Tax due. If the total of lines 5 and 8 is more than line 7, enter amount owed.......right arrow 9 2,902
10 Overpayment. If line 7 is more than the total of lines 5 and 8, enter the amount overpaid...right arrow 10  
11 Enter the amount of line 10 to be: Credited to 2025 estimated taxright arrow   Refundedright arrow 11  
Form 990-PF (2024)
Form 990-PF (2024)
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. right arrow$ 0(2) On foundation managers.right arrow$ 0
e
Enter the reimbursement (if any) paid by the foundation during the year for political expenditure tax imposed
on foundation managers.right arrow$ 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)
right arrowFL
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 2024 or the taxable year beginning in 2024? 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 addressright arrowHTTP://WWW.SONTAGFOUNDATION.ORG/
14
The books are in care ofright arrowFREDERICK SONTAG Telephone no.right arrow (904) 273-8755

Located atright arrow816 A1A NORTH STE 201PONTE VEDRAFL ZIP+4right arrow32082
15
Section 4947(a)(1) nonexempt charitable trusts filing Form 990-PF in lieu of Form 1041 —check here .........right arrow
and enter the amount of tax-exempt interest received or accrued during the year ........right arrow
15
 
16 At any time during calendar year 2024, 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 right arrow
Form 990-PF (2024)
Form 990-PF (2024)
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 ........right arrow
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 2024? .............
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 2024, did the foundation have any undistributed income (Part XII, lines 6d
and 6e) for tax year(s) beginning before 2024?....................
2a
 
No
If "Yes," list the years right arrow20, 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.
right arrow20, 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 2024 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 Schedule C, Form 4720, to determine
if the foundation had excess business holdings in 2024.) .....................
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 2024? ..
4b
 
No
Form 990-PF (2024)
Form 990-PF (2024)
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)
Yes
 
(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
 
No
c
Organizations relying on a current notice regarding disaster assistance check .........right arrow
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
Yes
 
If "Yes," attach the statement required by Regulations section 53.4945–5(d). Click to see attachment
List of Attached Documents:
// Content
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
FREDERICK B SONTAG DIRECTOR
1.00 		0 0 0
816 A1A NORTH STE 201
PONTE VEDRA BEACH,FL32082
BRADLEY D MOTTIER DIRECTOR
1.00 		8,000 0 0
816 A1A NORTH STE 201
PONTE VEDRA BEACH,FL32082
GRANT M CONWAY DIRECTOR
1.00 		8,000 0 0
816 A1A NORTH STE 201
PONTE VEDRA BEACH,FL32082
DANIEL M RYAN DIRECTOR
1.00 		8,000 0 0
816 A1A NORTH STE 201
PONTE VEDRA BEACH,FL32082
JENNIFER H LEVINSON DIRECTOR
1.00 		8,000 0 0
816 A1A NORTH STE 201
PONTE VEDRA BEACH,FL32082
JEFFREY E BERNARDO DIRECTOR
1.00 		8,000 0 0
816 A1A NORTH STE 201
PONTE VEDRA BEACH,FL32082
BEN CHATRAW DIRECTOR
1.00 		8,000 0 0
816 A1A NORTH STE 201
PONTE VEDRA BEACH,FL32082
CAROLYN MATHIS DIRECTOR
1.00 		8,000 0 0
816 A1A NORTH STE 201
PONTE VEDRA BEACH,FL32082
KATHERINE VERBLE DIRECTOR
1.00 		8,000 0 0
816 A1A NORTH STE 201
PONTE VEDRA BEACH,FL32082
CLAY TOUSEY III DIRECTOR
1.00 		8,000 0 0
816 A1A NORTH STE 201
PONTE VEDRA BEACH,FL32082
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
HILARY KEELEY EXECUTIVE DIRECTOR
40.00 		272,000 15,880 0
816 A1A NORTH STE 201
PONTE VEDRA BEACH,FL32082
Total number of other employees paid over $50,000...................right arrow 0
Form 990-PF (2024)
Form 990-PF (2024)
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 KIYATEC - DIRECT EQUITY PROGRAM RELATED INVESTMENT 500,000
2 MYOSIN THERAPEUTICS - DIRECT EQUITY PROGRAM RELATED INVESTMENT 250,000
All other program-related investments. See instructions.
3 Click to see attachment
List of Attached Documents:
// Content
199,999
Total. Add lines 1 through 3.........................right arrow949,999
Form 990-PF (2024)
Form 990-PF (2024)
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
185,337,730
b
Average of monthly cash balances.......................
1b
8,535,283
c
Fair market value of all other assets (see instructions)................
1c
7,524,590
d
Total (add lines 1a, b, and c).........................
1d
201,397,603
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
201,397,603
4
Cash deemed held for charitable activities. Enter 1.5% (0.015) of line 3 (for greater amount, see
instructions) .............................
4
3,020,964
5
Net value of noncharitable-use assets. Subtract line 4 from line 3. ............
5
198,376,639
6
Minimum investment return. Enter 5% (0.05) of line 5................
6
9,918,832
Part X
Distributable Amount (see instructions) (Section 4942(j)(3) and (j)(5) private operating foundations and certain foreign organizations check here right arrow and do not complete this part.)
1
Minimum investment return from Part IX, line 6..................
1
9,918,832
2a
Tax on investment income for 2024 from Part V, line 5 .......
2a
156,676
b
Income tax for 2024. (This does not include the tax from Part V.) ...
2b
 
c
Add lines 2a and 2b............................
2c
156,676
3
Distributable amount before adjustments. Subtract line 2c from line 1............
3
9,762,156
4
Recoveries of amounts treated as qualifying distributions................
4
0
5
Add lines 3 and 4............................
5
9,762,156
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
9,762,156
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, column (d), line 26 ..........
1a
8,886,211
b
Program-related investments—total from Part VIII-B..................
1b
949,999
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
9,836,210
Form 990-PF (2024)
Form 990-PF (2024)
Page 9
Part XII
Undistributed Income (see instructions)
(a)
Corpus 		(b)
Years prior to 2023 		(c)
2023 		(d)
2024
1 Distributable amount for 2024 from Part X, line 7 9,762,156
2 Undistributed income, if any, as of the end of 2024:
a Enter amount for 2023 only....... 0
b Total for prior years:20 , 20, 20 0
3 Excess distributions carryover, if any, to 2024:
a From 2019......  
b From 2020...... 19,953
c From 2021......  
d From 2022...... 881,221
e From 2023...... 717,839
f Total of lines 3a through e ........ 1,619,013
4Qualifying distributions for 2024 from Part
XI, line 4: right arrow$ 9,836,210
a Applied to 2023, 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 2024 distributable amount..... 9,762,156
e Remaining amount distributed out of corpus 74,054
5 Excess distributions carryover applied to 2024. 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 1,693,067
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 2023. Subtract line
4a from line 2a. Taxable amount—see
instructions ............. 		0
f Undistributed income for 2024. Subtract
lines 4d and 5 from line 1. This amount must
be distributed in 2025 .......... 		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 2019 not
applied on line 5 or line 7 (see instructions) ... 		0
9 Excess distributions carryover to 2025.
Subtract lines 7 and 8 from line 6a ...... 		1,693,067
10 Analysis of line 9:
a Excess from 2020.... 19,953
b Excess from 2021....  
c Excess from 2022.... 881,221
d Excess from 2023.... 717,839
e Excess from 2024.... 74,054
Form 990-PF (2024)
Form 990-PF (2024)
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 2024, enter the date of the ruling ...... right arrow
 
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) 2024 (b) 2023 (c) 2022 (d) 2021
         
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, b, or c 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).)
FREDERICK B SONTAG
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 right arrow 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, b, c, and d. See instructions
aThe name, address, and telephone number or e-mail address of the person to whom applications should be addressed:
THE SONTAG FOUNDATION
816 A1A NORTH SUITE 201
PONTE VEDRA BEACH,FL32082
(904) 273-8755
bThe form in which applications should be submitted and information and materials they should include:
APPLICATIONS FOR BRAIN CANCER RESEARCH/CAREER DEVELOPMENT GRANTS SHOULD BE SUBMITTED ONLINE AT HTTP://WWW.SONTAGFOUNDATION.ORG/ALL-GRANTS/BRAIN-CANCER/DSA-APPLICATION- INFO-REQUIREMENTS/ IN RESPONSE TO PUBLISHED REQUESTS FOR APPLICATIONS.
cAny submission deadlines:
VARIOUS
dAny restrictions or limitations on awards, such as by geographical areas, charitable fields, kinds of institutions, or other
factors:
GRANTS UP TO A MAXIMUM OF $600,000 MAY BE AWARDED.
Form 990-PF (2024)
Form 990-PF (2024)
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

BRIGHAM & WOMEN'S HOSPITAL

399 REVOLUTION DRIVE STE 740
SOMERVILLE,MA02145 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 362,500

INTERNATIONAL BRAIN TUMOR ALLIANCE

PO BOX 244
TADWORTH SURREY   KT20 5WQ
UK 		NONE EXEMPT ORGANIZATION FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 5,000

JOHN HOPKINS UNIVERSITY SCHOOL OF MEDICINE

1550 ORLEANS STREET
BALTIMORE,MD21231 		NONE EXEMPT ORGANIZATION FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 100,000

UNIVERSITY OF MINNESOTA

2001 6TH ST SE
MINNEAPOLIS,MN55455 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 112,500

WEILL CORNELL

575 LEXINGTON AVE 9TH FLOOR
NEW YORK,NY10022 		NONE EXEMPT ORGANIZATION FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 112,500

YALE UNIVERSITY

850 WEST CAMPUS DR ISTC 361
WEST HAVEN,CT06516 		NONE EXEMPT ORGANIZATION FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

BOSTON CHILDREN'S HOSPITAL

300 LONGWOOD AVE
BOSTON,MA02115 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 262,500

COMMUNITY FOUNDATION OF NE FL

245 RIVERSIDE AVE 310
JACKSONVILLE,FL32202 		NONE EXEMPT ORGANIZATION FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 3,000,000

NATIONAL BRAIN TUMOR SOCIETY

55 CHAPEL ST STE 200
NEWTON,MA02458 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 33,332

UNIVERSITY OF TEXAS SOUTHWESTERN

910 TRAVIS ST
HOUSTON,TX77002 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

REGENTS OF UNIV OF CA-SAN FRANCISCO

1855 FOLSOM ST STE 425
SAN FRANCISCO,CA94103 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 187,500

UNIVERSITY OF FLORIDA FOUNDATION INC

PO BOX 14425
GAINESVILLE,FL32604 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 25,000

UNIVERSITY OF MASSACHUSETTS MED SCHOOL

55 LAKE AVENUE NORTH
WORCESTER,MA01655 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

RICE UNIVERSITY

6100 MAIN ST
HOUSTON,TX77005 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

UNIVERSITY OF PITTSBURGH

4200 FIFTH AVE
PITTSBURGH,PA15260 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

AMERICAN ASSOCIATION FOR CANCER RESEARCH

615 CHESTNUT STREET
PHILADELPHIA,PA19106 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 132,000

BAYLOR COLLEGE OF MEDICINE

1 BAYLOR PLZ
HOUSTON,TX77030 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

MISSION BRAIN FOUNDATION

3001 BRIDGEWAY STE K161
SAUSALITO,CA94965 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 5,000

THE REGENTS OF UNIVERSITY OF CALIFORNIA

1111 FRANKLIN ST12TH FLOOR
OAKLAND,CA94607 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

MARK FOUNDATION FOR CANCER RESEARCH

1350 AVENUE OF THE AMERICAS SUITE
2902
NEW YORK,NY10019 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 300,000

CHILDREN'S HOSPITAL OF PHILADELPHIA

3401 CIVIC CENTER BLVD
PHILADELPHIA,PA19104 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

STANFORD JUNIOR UNIVERSITY

450 JANE STANFORD WAY
STANFORD,CA94305 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 100,000

REMISSION SUMMIT

1149 NEWELL DRIVE
GAINESVILLE,FL32610 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 5,000

AMERICAN SOCIETY OF CLINICAL ONCOLOGY

2318 MILL ROAD SUITE 800
ALEXANDRIA,VA22314 		NONE EXEMPT ORGANIZATION FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 3,000

FRED HUTCHINSON CANCER CENTER

1100 FAIRVIEW AVE N
SEATTLE,WA98109 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 37,500

UNIVERSITY OF ILLINOIS

1304 W GREEN STREET
URBANA,IL61801 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 37,500

DANA FARBER CANCER INSTITUTE INC

44 BINNEY ST SUITE BP 60
BOSTON,MA02115 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 100,000

MASSACHUSETTS INSTITUTE OF TECHNOLOGY

77 MASSACHUSETTS AVE
CAMBRIDGE,MA02139 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

SOCIETY FOR NEURO-ONCOLOGY

PO BOX 890886
HOUSTON,TX772890886 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 40,000

CALIFORNIA INSTITUTE OF TECHNOLOGY

1200 E CALIFORNIA BLVD
PASADENA,CA91125 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 250,000

CLEVELAND CLINIC

9500 EUCLID AVENUE DV3
CLEVELAND,OH44195 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 100,000

CENTRAL BRAIN TUMOR REGISTRY OF THE USA

244 E OGDEN AVE SUITE 116
HINSDALE,IL60521 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 5,000

DUKE UNIVERSITY

2301 ERWIN RD
DURHAM,NC27710 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 37,500

THE REGENTS OF THE UNIVERSITY OF MICHIGAN

2600 W BIG BEAVER RD
TROY,MI48084 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 350,000

UNIVERSITY OF TEXAS MD ANDERSON CANCER CENTER

910 TRAVIS ST
HOUSTON,TX77002 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 100,000
Total .................................right arrow 3a 7,153,332
bApproved for future payment

BRIGHAM & WOMEN'S HOSPITAL
399 REVOLUTION DRIVE STE 740
SOMERVILLE,MA02145 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

CALIFORNIA INSTITUTE OF TECHNOLOGY
1200 E CALIFORNIA BLVD
PASADENA,CA91125 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 255,000

AMERICAN SOCIETY OF CLINICAL ONCOLOGY
2318 MILL ROAD SUITE 800
ALEXANDRIA,VA22314 		NONE EXEMPT ORGANIZATION FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 60,900

DUKE UNIVERSITY
2301 ERWIN RD
DURHAM,NC27710 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

EMORY UNIVERSITY
201 DOWMAN DR
ATLANTA,GA30322 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 100,000

HEALTH RESEARCH ALLIANCE
65 TW ALEXANDER DRIVE UNIT 13605
RESEARCH TRIANGLE PARK,NC27709 		NONE EXEMPT ORGANIZATION FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 75,000

HOSPITAL FOR SICK CHILDREN
1731 BUNKER HILL RD NE
WASHINGTON,DC20017 		NONE EXEMPT ORGANIZATION FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 100,000

MASSACHUSETTS GENERAL HOSPITAL
149 13TH ST BLDG 149
CHARLESTOWN,MA02129 		NONE EXEMPT ORGANIZATION FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 100,000

MASSACHUSETTS INSTITUTE OF TECHNOLOGY
77 MASSACHUSETTS AVE
CAMBRIDGE,MA02139 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

SOCIETY FOR NEURO-ONCOLOGY
PO BOX 890886
HOUSTON,TX772890886 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 40,000

ST JUDE CHILDREN'S RESEARCH
262 DANNY THOMAS PL
MEMPHIS,TN38105 		NONE EXEMPT ORGANIZATION FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 100,000

THE REGENTS OF THE UNIVERSITY OF MICHIGAN
2600 W BIG BEAVER RD
TROY,MI48084 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 112,500

UNIVERSITY OF CALIFORNIA SAN FRANCISCO
533 PARNASSUS AVE
SAN FRANCISCO,CA94143 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 37,500

YALE UNIVERSITY
850 WEST CAMPUS DR ISTC 361
WEST HAVEN,CT06516 		NONE EXEMPT ORGANIZATION FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 212,500

BOSTON CHILDREN'S HOSPITAL
300 LONGWOOD AVE
BOSTON,MA02115 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 212,500

COMMUNITY FOUNDATION OF NE FL
245 RIVERSIDE AVE 310
JACKSONVILLE,FL32202 		NONE EXEMPT ORGANIZATION FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 3,000,000

BAYLOR COLLEGE OF MEDICINE
1 BAYLOR PLZ
HOUSTON,TX77030 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

CHILDREN'S HOSPITAL OF PHILADELPHIA
3401 CIVIC CENTER BLVD
PHILADELPHIA,PA19104 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

UNIVERSITY OF PITTSBURGH
4200 FIFTH AVE
PITTSBURGH,PA15260 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

AMERICAN ASSOCIATION FOR CANCER RESEARCH
615 CHESTNUT STREET
PHILADELPHIA,PA19106 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 83,000

FRED HUTCHINSON CANCER CENTER
1100 FAIRVIEW AVE N
SEATTLE,WA98109 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

REGENTS OF UNIV OF CA-SAN FRANCISCO
1855 FOLSOM ST STE 425
SAN FRANCISCO,CA94103 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 262,500

RICE UNIVERSITY
6100 MAIN ST
HOUSTON,TX77005 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 187,500

UNIVERSITY OF ILLINOIS
1304 W GREEN STREET
URBANA,IL61801 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

UNIVERSITY OF MASSACHUSETTS MED SCHOOL
55 LAKE AVENUE NORTH
WORCESTER,MA01655 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 112,500

THE REGENTS OF UNIVERSITY OF CALIFORNIA
1111 FRANKLIN ST12TH FLOOR
OAKLAND,CA94607 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 150,000

UT SOUTHWESTERN MEDICAL CENTER
5323 HARRY HINES BLVD
DALLAS,TX75390 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 112,500

CASE WESTERN RESERVE UNIVERSITY
2103 CORNELL ROAD
CLEVELAND,OH44106 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 37,500

HARVARD MEDICAL SCHOOL
25 SHATTUCK STREET
BOSTON,MA02115 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 100,000

AMERICAN CANCER SOCIETY
250 WILLIAMS STREET NW
ATLANTA,GA30303 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 100,000

CRITICAL PATH INSTITUTE
1840 E RIVER RD SUITE 100
TUCSON,AZ85718 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 137,500

SNO FOUNDATION
420 MONTGOMERY STREET
SAN FRANCISCO,CA94104 		NONE PUBLIC CHARITY FOR THE EXEMPT PURPOSES OF THIS ORGANIZATION 30,000
Total ................................. right arrow 3b 6,918,900
Form 990-PF (2024)
Form 990-PF (2024)
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 2,933,702  
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 9,495,842  
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 12,429,544 0
13Total. Add line 12, columns (b), (d), and (e)..................
13
12,429,544
(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 (2024)
Form 990-PF (2024)
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.
right arrow right arrow
May the IRS discuss this return
with the preparer shown below?
See instructions.
Signature of officer or trustee Date Title
Paid Preparer Use Only Print/Type preparer's name Preparer's Signature Date Check if self-
employed right arrow		 PTIN
Firm's name Right Arrow
 Firm's EIN Right Arrow
Firm's address Right Arrow


 Phone no.
Form 990-PF (2024)
Additional Data


Software ID:  
Software Version:  


Form 990PF - Special Condition Description:
Special Condition Description
Schedule B
(Form 990)
(Rev. January 2025)
Department of the Treasury
Internal Revenue Service
Schedule of Contributors

right arrow Attach to Form 990, 990-EZ, or 990-PF.
right arrow Go to www.irs.gov/Form990 for the latest information.
OMB No. 1545-0047
Name of the organization
SONTAG FOUNDATION
 
Employer identification number

59-3634325
Organization type (check one):
Filers of:
Section:
Form 990 or 990-EZ
501(c)( ) (enter number) organization

4947(a)(1) nonexempt charitable trust not treated as a private foundation

527 political organization


Form 990-PF
501(c)(3) exempt private foundation

4947(a)(1) nonexempt charitable trust treated as a private foundation

501(c)(3) taxable private foundation
Check if your organization is covered by the General Rule or a Special Rule.  
Note:  Only a section 501(c)(7), (8), or (10) organization can check boxes for both the General Rule and a Special Rule. See instructions.
General Rule
For an organization filing Form 990, 990-EZ, or 990-PF that received, during the year, contributions totaling $5,000 or more (in money or other property) from any one contributor. Complete Parts I and II. See instructions for determining a contributor's total contributions.
Special Rules
For an organization described in section 501(c)(3) filing Form 990 or 990-EZ that met the 331/3% support test of the regulations
under sections 509(a)(1) and 170(b)(1)(A)(vi), that checked Schedule A (Form 990 or 990-EZ), Part II, line 13, 16a, or 16b, and that received from any one contributor, during the year, total contributions of the greater of (1) $5,000 or (2) 2% of the amount on (i) Form 990, Part VIII, line 1h, or (ii) Form 990-EZ, line 1. Complete Parts I and II.
For an organization described in section 501(c)(7), (8), or (10) filing Form 990 or 990-EZ that received from any one contributor,
during the year, total contributions of more than $1,000 exclusively for religious, charitable, scientific, literary, or educational purposes, or for the prevention of cruelty to children or animals. Complete Parts I, II, and III.
For an organization described in section 501(c)(7), (8), or (10) filing Form 990 or 990-EZ that received from any one contributor,
during the year, contributions exclusively for religious, charitable, etc., purposes, but no such contributions totaled more than $1,000. If this box is checked, enter here the total contributions that were received during the year for an exclusively religious, charitable, etc., purpose. Don't complete any of the parts unless the General Rule applies to this organization because it received nonexclusively religious, charitable, etc., contributions totaling $5,000 or more during the year ......... Right Arrow $  
Caution: An organization that isn't covered by the General Rule and/or the Special Rules doesn't file Schedule B (Form 990,
990-EZ, or 990-PF), but it must answer “No” on Part IV, line 2, of its Form 990; or check the box on line H of its Form 990-EZ
or on its Form 990PF, Part I, line 2, to certify that it doesn't meet the filing requirements of Schedule B (Form 990,
990-EZ, or 990-PF).
For Paperwork Reduction Act Notice, see the Instructions
for Form 990, 990-EZ, or 990-PF.
Cat. No. 30613XSchedule B (Form 990) (Rev. 1-2025)
Schedule B (Form 990) (Rev. 1-2025) Page 2
Name of organization
SONTAG FOUNDATION
  		Employer identification number
59-3634325
Part I
Contributors (see instructions). Use duplicate copies of Part I if additional space is needed.
(a)
No.		 (b)
Name, address, and ZIP + 4		 (c)
Total contributions		 (d)
Type of contribution
1
FREDERICK SONTAG
816 A1A NORTH STE 201
 
PONTE VEDRA BEACH, FL32082

$ 11,820,053


(Complete Part II for noncash contributions.)
(a)
No.		 (b)
Name, address, and ZIP + 4		 (c)
Total contributions		 (d)
Type of contribution
2
SPRING BAY MANAGEMENT
 
816 A1A NORTH STE 201
 
PONTE VEDRA BEACH, FL32082

$ 358,525


(Complete Part II for noncash contributions.)
(a)
No.		 (b)
Name, address, and ZIP + 4		 (c)
Total contributions		 (d)
Type of contribution
 
 
 
 

$  


(Complete Part II for noncash contributions.)
(a)
No.		 (b)
Name, address, and ZIP + 4		 (c)
Total contributions		 (d)
Type of contribution
 
 
 
 

$  


(Complete Part II for noncash contributions.)
(a)
No.		 (b)
Name, address, and ZIP + 4		 (c)
Total contributions		 (d)
Type of contribution
 
 
 
 

$  


(Complete Part II for noncash contributions.)
(a)
No.		 (b)
Name, address, and ZIP + 4		 (c)
Total contributions		 (d)
Type of contribution
 
 
 
 

$  


(Complete Part II for noncash contributions.)
Schedule B (Form 990) (Rev. 1-2025)
Schedule B (Form 990) (Rev. 1-2025)
Page 3
Name of organization
SONTAG FOUNDATION
  		Employer identification number

59-3634325
Part II
Noncash Property (see instructions). Use duplicate copies of Part II if additional space is needed.
(a)
No. from Part I 		(b)
Description of noncash property given 		(c)
FMV (or estimate)
(See instructions) 		(d)
Date received
1
 1185 PONTE VEDRA BLVD, PONTE VEDRA BEACH, FL 32082 $ 18,000,000 2024-07-31
(a)
No. from Part I 		(b)
Description of noncash property given 		(c)
FMV (or estimate)
(See instructions) 		(d)
Date received
 
$    
(a)
No. from Part I 		(b)
Description of noncash property given 		(c)
FMV (or estimate)
(See instructions) 		(d)
Date received
 
$    
(a)
No. from Part I 		(b)
Description of noncash property given 		(c)
FMV (or estimate)
(See instructions) 		(d)
Date received
 
$    
(a)
No. from Part I 		(b)
Description of noncash property given 		(c)
FMV (or estimate)
(See instructions) 		(d)
Date received
 
$    
(a)
No. from Part I 		(b)
Description of noncash property given 		(c)
FMV (or estimate)
(See instructions) 		(d)
Date received
 
$    
Schedule B (Form 990) (Rev. 1-2025)
Schedule B (Form 990) (Rev. 1-2025)
Page 4
Name of organization
SONTAG FOUNDATION
  		Employer identification number

59-3634325
Part III
Exclusively religious, charitable, etc., contributions to organizations described in section 501(c) (7), (8), or (10) that total more than $1,000 for the year from any one contributor. Complete columns (a) through (e) and the following line entry. For organizations completing Part III, enter the total of exclusively religious, charitable, etc., contributions of $1,000 or less for the year. (Enter this information once. See instructions.) $  
Use duplicate copies of Part III if additional space is needed.
(a)
No. from Part I		 (b) Purpose of gift (c) Use of gift (d) Description of how gift is held
 
(e) Transfer of gift
Transferee's name, address, and ZIP 4 Relationship of transferor to transferee
 
 
     
 
(a)
No. from Part I		 (b) Purpose of gift (c) Use of gift (d) Description of how gift is held
 
(e) Transfer of gift
Transferee's name, address, and ZIP 4 Relationship of transferor to transferee
 
 
     
 
(a)
No. from Part I		 (b) Purpose of gift (c) Use of gift (d) Description of how gift is held
 
(e) Transfer of gift
Transferee's name, address, and ZIP 4 Relationship of transferor to transferee
 
 
     
 
(a)
No. from Part I		 (b) Purpose of gift (c) Use of gift (d) Description of how gift is held
 
(e) Transfer of gift
Transferee's name, address, and ZIP 4 Relationship of transferor to transferee
 
 
     
 
Schedule B (Form 990) (Rev. 1-2025)
Additional Data


Software ID:  
Software Version:  

TY 2024 AccountingFeesSchedule
Name:
SONTAG FOUNDATION
EIN:
59-3634325
Category Amount Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
ACCOUNTING FEES 15,075 7,537   7,538

TY 2024 AllOthProgRltdInvestmentsSch
Name:
SONTAG FOUNDATION
EIN:
59-3634325
Category Amount
ENCLEAR THERAPIES - DIRECT EQUITY PROGRAM RELATED INVESTMENT 149,999
TIPPING POINT - DIRECT EQUITY PROGRAM RELATED INVESTMENT 50,000

Note: To capture the full content of this document, please select landscape mode (11" x 8.5") when printing.

TY 2024 ExpenditureResponsibilityStmt
Name:
SONTAG FOUNDATION
EIN:
59-3634325
Grantee's Name Grantee's Address Grant Date Grant Amount Grant Purpose Amount Expended By Grantee Any Diversion By Grantee? Dates of Reports By Grantee Date of Verification Results of Verification
KIYATEC CONVERTIBLE PROMISSORY NOTE 6
  		2 MAIN ST
GREENVILLE,SC29601 		2024-03-04 500,000 TO SUPPORT THE DEVELOPMENT AND COMMERCIALIZATION OF AN ASSAY THAT CAN PROVIDE ONCOLOGISTS AND RESEARCHERS WITH IN VITRO PATIENT-TUMOR SPECIFIC THERAPEUTIC RESPONSES FOR A PATIENT DIAGNOSED WITH A GLIOMA. 500,000 NO 1/16/2024, 4/7/2024, 7/17/2024, 10/25/2024    
TIPPINGPOINT BIOSCIENCES
  		953 INDIANA ST
SAN FRANCISCO,CA94107 		2024-07-08 50,000 TO UTILIZE THE UNIQUE SCREENING PLATFORM DEVELOPED BY TIPPINGPOINT TO IDENTIFY SMALL MOLECULE SCAFFOLDS THAT HAVE ACTIVITY AGAINST BRAIN TUMORS. 50,000 NO 10/18/2024    
ENCLEAR SERIES SEED - 3 PREFERRED
  		700 MAIN ST
CAMBRIDGE,MA02139 		2024-08-28 149,999 TO GENERATE DATA RELATING TO THE POTENTIAL USE OF THE ENTREGA PLATFORM (MEDICAL DEVICE) FOR NEURO-ONCOLOGY APPLICATIONS, SPECIFICALLY TO SUPPORT A LARGE ANIMAL STUDY THAT WILL PROVIDE A READ OUT OF DRUG PENETRATION INTO BRAIN TUMORS USING THE MEDICAL DEVICE. 149,999 NO 11/13/2024    
MYOSIN THERAPEUTICS SERIES SEED-1 PREFERRED
  		130 SCRIPPS WAY
JUPITER,FL33458 		2024-12-18 250,000 TO PROVIDE FUNDS FOR THE COMPANY TO CONTINUE PRECLINICAL RESEARCH TO INFORM MECHANISM OF ACTION AND POTENTIAL FUTURE CLINICAL TRIALS FOR THEIR SMALL MOLECULE THERAPEUTIC IN THE NEURO-ONCOLOGY FIELD 250,000 NO NONE IN 2024    

TY 2024 InvestmentsCorpBondsSchedule
Name:
SONTAG FOUNDATION
EIN:
59-3634325
Name of Bond End of Year Book Value End of Year Fair Market Value
FIXED INCOME 7,609,425 7,518,433
MUTUAL FUNDS 94,452 99,525

TY 2024 InvestmentsCorpStockSchedule
Name:
SONTAG FOUNDATION
EIN:
59-3634325
Name of Stock End of Year Book Value End of Year Fair Market Value
EQUITIES 23,587,262 27,375,537

TY 2024 InvestmentsOtherSchedule2
Name:
SONTAG FOUNDATION
EIN:
59-3634325
Category/ Item Listed at Cost or FMV Book Value End of Year Fair Market Value
REAL ESTATE & SPECIALTY ASSETS AT COST 163,002,186 163,002,186
PROGRAM RELATED INVESTMENTS AT COST 2,999,976 2,999,976

TY 2024 LegalFeesSchedule
Name:
SONTAG FOUNDATION
EIN:
59-3634325
Category Amount Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
LEGAL FEES 10,874 2,188   8,686


TY 2024 OtherAssetsSchedule
Name:
SONTAG FOUNDATION
EIN:
59-3634325
Description Beginning of Year - Book Value End of Year - Book Value End of Year - Fair Market Value
SEMINAR DEPOSITS 18,775 5,800 5,800
GLASS AWARDS 42,894 30,139 30,139


TY 2024 OtherExpensesSchedule
Name:
SONTAG FOUNDATION
EIN:
59-3634325
Description Revenue and Expenses per Books Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
ADVISORY BOARD HONORARIUM 27,500 0   27,500
COMPUTER EXPENSE 26,723 5,462   21,261
DUES & SUBSCRIPTIONS 18,326 0   18,326
EXPENSES FROM PARTNERSHIPS 1,203,700 1,203,700   0
INSURANCE 2,099 430   1,669
OFFICE EXPENSE 17,054 3,496   13,558
PAYROLL EXPENSES 8,934 1,832   7,102
TELEPHONE 4,888 1,002   3,886
POSTAGE & MAILING 1,125 0   1,125
OTHER INCOME/LOSS FROM PARTNERSHIPS & 1099S -868,955 -868,955   0
OTHER ORDINARY INCOME/LOSS FROM PARTNERSHIPS 737 737   0
WEBSITE & SOFTWARE 41,663 5,944   35,719
OUTSIDE SERVICES 128,624 16,444   112,180
BANK FEES 14 14   0


TY 2024 OtherIncreasesSchedule
Name:
SONTAG FOUNDATION
EIN:
59-3634325
Description Amount
UNREALIZED GAIN 17,456,845


TY 2024 OtherLiabilitiesSchedule
Name:
SONTAG FOUNDATION
EIN:
59-3634325
Description Beginning of Year - Book Value End of Year - Book Value
DEFERRED COMPENSATION 127,971 139,219


TY 2024 OtherProfessionalFeesSchedule
Name:
SONTAG FOUNDATION
EIN:
59-3634325
Category Amount Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
INVESTMENT MANAGEMENT FEES 399,952 399,952   0
OTHER MANAGEMENT FEES 12,000 12,000   0


TY 2024 TaxesSchedule
Name:
SONTAG FOUNDATION
EIN:
59-3634325
Category Amount Net Investment Income Adjusted Net Income Disbursements for Charitable Purposes
FOREIGN TAXES 102,149 102,149   0
PAYROLL TAXES 50,776 9,925   40,851
PROPERTY TAXES 76,330 76,330   0