International Stem Cell director disposes of 30K options

Director Paul V. Maier returned 30,000 fully vested stock options to International Stem Cell CORP, leaving no remaining options from this grant.

Rhea-AI Filing Summary

International Stem Cell CORP (ISCO) reported that director Paul V. Maier disposed of stock options to the issuer on September 16, 2026. The transaction covered 30,000 stock options exercisable at $0.12 per share for common stock and left him with no remaining options of this grant. The options, originally granted on June 11, 2024, had fully vested on June 11, 2025, and were scheduled to expire on June 11, 2034. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Disposition: 30,000 shares

Disposition 1 txn

Insider MAIER PAUL V

Role Director

Type	Security	Shares	Price	Value
Disposition	Stock Options F1	30,000	$0.00	$0.00

Holdings After Transaction: Stock Options — 0 contracts (Direct)

Footnotes (1)

1. F1. The shares subject to the option fully vested on 06/11/2025 from the date of grant (06-11-2024).

Key Figures

Options disposed: 30,000 stock options Exercise price: $0.12 per share Underlying common shares: 30,000 shares +2 more

5 metrics

Options disposed 30,000 stock options Disposition to issuer reported for September 16, 2026

Exercise price $0.12 per share Exercise price of the disposed stock options

Underlying common shares 30,000 shares Each option corresponded to one share of ISCO common stock

Expiration date June 11, 2034 Scheduled expiration of the disposed options

Post-transaction options from this grant 0 options Total options remaining from this grant after disposition

Key Terms

Stock Options, Disposition to issuer, Exercise price

3 terms

Stock Options financial

"The transaction covered 30,000 stock options exercisable at $0.12 per share"

Stock options are agreements that give a person the right to buy or sell a company's stock at a specific price within a certain time frame. They are often used as a reward or incentive, similar to a coupon that can be used later if the stock price rises, allowing the holder to make a profit.

Disposition to issuer financial

"The transaction action is described as a disposition to issuer"

Exercise price financial

"The options had an exercise price of $0.12 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.

FAQ

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

What insider transaction did ISCO disclose for Paul V. Maier?

ISCO disclosed that director Paul V. Maier disposed of 30,000 stock options to the issuer on September 16, 2026, eliminating his remaining options from this particular grant.

How many ISCO stock options were involved in Paul V. Maier’s Form 4?

The Form 4 reports a disposition of 30,000 stock options held by director Paul V. Maier, each option corresponding to one share of ISCO common stock.

What was the exercise price of the ISCO options disposed of by Paul V. Maier?

The disposed options had an exercise price of $0.12 per share, with each option exercisable into one share of ISCO common stock.

Does Paul V. Maier still hold any ISCO options from this grant after the transaction?

No. After the reported disposition, the Form 4 shows 0 options remaining from this specific 30,000-option grant for Paul V. Maier.

Were Paul V. Maier’s ISCO option transactions made under a Rule 10b5-1 plan?

No. The filing indicates that no Rule 10b5-1 trading plan is associated with the reported disposition of the 30,000 ISCO stock options.

When did the ISCO options disposed by Paul V. Maier vest and when would they have expired?

The filing notes the options fully vested on June 11, 2025 from a grant dated June 11, 2024 and carried an expiration date of June 11, 2034.

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

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Available on EDGAR 09/17/2026 - 08:46 PM Accepted by SEC EDGAR 09/17/2026 - 08:46 PM Learn about SEC filing dates

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^*

MAIER PAUL V

(Last) (First) (Middle)

C/O INTERNATIONAL STEM CELL CORP.

9745 BUSINESSPARK AVE.

(Street)

SAN DIEGO CALIFORNIA 92131

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
International Stem Cell CORP [ ISCO ]

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)
09/16/2026

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)
			Code	V	Amount	(A) or (D)	Price

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Options	$0.12	09/16/2026		D			30,000	06/11/2025(1)	06/11/2034	Common Stock	30,000	$0	0	D

Explanation of Responses:

1. The shares subject to the option fully vested on 06/11/2025 from the date of grant (06-11-2024).

	/s/ Paul Maier	09/17/2026
	** 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)