Soligenix Zeldis surrenders options on 632 shares

Q: What is the corrected expiration date of Jerome B. Zeldis's SNGX option?

The option covering 78,947 shares, granted September 17, 2026 at an exercise price of $0.38 per share, expires September 16, 2036. This corrects the previously reported June 16, 2036 expiration date.

The corrected option covers 78,947 shares at an exercise price of $0.38 per share and expires September 16, 2036.

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Form Type

Rhea-AI Filing Summary

Soligenix, Inc. (SNGX) director Jerome B. Zeldis voluntarily surrendered stock options exercisable for an aggregate of 632 shares of common stock to the issuer for cancellation for no consideration on October 12, 2026. The remarks also correct the expiration date of an option covering 78,947 shares, granted September 17, 2026 at an exercise price of $0.38 per share: its correct expiration date is September 16, 2036, rather than June 16, 2036.

Insider Trade Summary

Disposition: 632 shares

Disposition 6 txns

Insider ZELDIS JEROME B

Role Director

Type	Security	Shares	Price	Value
Disposition	Stock Option (Right to Buy) ^F1	54	$0.00	$0.00
Disposition	Stock Option (Right to Buy)	74	$0.00	$0.00
Disposition	Stock Option (Right to Buy)	128	$0.00	$0.00
Disposition	Stock Option (Right to Buy)	63	$0.00	$0.00
Disposition	Stock Option (Right to Buy)	121	$0.00	$0.00
Disposition	Stock Option (Right to Buy)	192	$0.00	$0.00

Holdings After Transaction: Stock Option (Right to Buy) — 0 contracts (Direct)

Footnotes (1)

F1. On October 12, 2026, the Reporting Person voluntarily surrendered stock options exercisable for an aggregate of 632 shares of Common Stock with exercise prices set forth in the table above to the Issuer for cancellation for no consideration. The cancellation is exempt from Section 16(b) of the Exchange Act pursuant to Rule 16b-3(e) and Rule 16b-6(d), and exempt from the reporting requirements of Section 16(a) pursuant to Rule 16a-4(d). The Reporting Person is voluntarily reporting this transaction.

Key Figures

Shares underlying surrendered options: 632 shares Shares covered by corrected option: 78,947 shares Exercise price: $0.38 per share

3 metrics

Shares underlying surrendered options 632 shares Voluntarily surrendered for cancellation on October 12, 2026

Shares covered by corrected option 78,947 shares Option granted September 17, 2026

Exercise price $0.38 per share Option granted September 17, 2026

Key Terms

Stock Option (Right to Buy), exercise price, Rule 16b-3(e)

3 terms

Stock Option (Right to Buy) financial

"Stock Option (Right to Buy) covering 78,947 shares of Common Stock"

exercise price financial

"at an exercise price of $0.38 per share"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

Rule 16b-3(e) regulatory

"exempt from Section 16(b) ... pursuant to Rule 16b-3(e)"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many SNGX shares did Jerome B. Zeldis surrender?

Jerome B. Zeldis surrendered options exercisable for an aggregate of 632 shares of Soligenix common stock to the issuer for cancellation for no consideration on October 12, 2026.

What is the corrected expiration date of Jerome B. Zeldis's SNGX option?

The option covering 78,947 shares, granted September 17, 2026 at an exercise price of $0.38 per share, expires September 16, 2036. This corrects the previously reported June 16, 2036 expiration date.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/13/2026 - 10:10 AM EDT Accepted by SEC EDGAR 10/13/2026 - 10:09 AM EDT

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

ZELDIS JEROME B

(Last)

(First)

(Middle)

C/O SOLIGENIX, INC.

29 EMMONS DRIVE, SUITE B-10

(Street)

PRINCETON

NEW JERSEY

08540

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
SOLIGENIX, INC. [ SNGX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
	Officer (give title below)	Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/12/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Option (Right to Buy)	$549.6	10/12/2026		D⁽¹⁾	V		54	06/08/2017	06/07/2027	Common Stock	54	$0	0	D
Stock Option (Right to Buy)	$400.8	10/12/2026		D	V		74	09/27/2018	09/26/2028	Common Stock	74	$0	0	D
Stock Option (Right to Buy)	$232.8	10/12/2026		D	V		128	09/06/2019	09/05/2029	Common Stock	128	$0	0	D
Stock Option (Right to Buy)	$472.8	10/12/2026		D	V		63	09/16/2020	09/15/2030	Common Stock	63	$0	0	D
Stock Option (Right to Buy)	$247.2	10/12/2026		D	V		121	09/23/2021	09/22/2031	Common Stock	121	$0	0	D
Stock Option (Right to Buy)	$156	10/12/2026		D	V		192	11/17/2022	11/16/2032	Common Stock	192	$0	0	D

Explanation of Responses:

1. On October 12, 2026, the Reporting Person voluntarily surrendered stock options exercisable for an aggregate of 632 shares of Common Stock with exercise prices set forth in the table above to the Issuer for cancellation for no consideration. The cancellation is exempt from Section 16(b) of the Exchange Act pursuant to Rule 16b-3(e) and Rule 16b-6(d), and exempt from the reporting requirements of Section 16(a) pursuant to Rule 16a-4(d). The Reporting Person is voluntarily reporting this transaction.

Remarks:

That Reporting Person's Form 4 filed on September 18, 2026 reported an expiration date of June 16, 2036 for the Stock Option (Right to Buy) covering 78,947 shares of Common Stock at an exercise price of $0.38 per share, granted on September 17, 2026. That date was a typographical error. The correct expiration date of the option is September 16, 2036.

	/s/ Jerome B. Zeldis	10/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR