SELLAS CEO granted 1,065,000 restricted stock units

Stergiou Angelos M. reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Stergiou Angelos M. reported acquisition or exercise transactions in this Form 4 filing.

SELLAS Life Sciences Group reported that President and CEO Angelos M. Stergiou received a grant of 1,065,000 restricted stock units on June 16, 2026. These RSUs vest 25% on December 1, 2026 and 25% on each December 1 thereafter, subject to continued service, bringing his direct holdings to 1,759,183 shares.

Insider Trade Summary

Grant/Award: 1,065,000 shares

Grant/Award 1 txn

Insider Stergiou Angelos M.

Role President and CEO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	1,065,000	$0.00	$0.00

Holdings After Transaction: Common Stock — 1,759,183 shares (Direct)

Footnotes (1)

1. F1. The Reporting Person received an award of 1,065,000 restricted stock units on June 16, 2026, which shall vest as follows: (i) 25% on December 1, 2026 and (ii) 25% on each December 1 thereafter until fully vested, provided that the Reporting Person remains in service with the Issuer through each such vesting date.

Key Figures

RSU grant size: 1,065,000 units Vesting schedule: 25% annually each December 1 Holdings after transaction: 1,759,183 shares +1 more

4 metrics

RSU grant size 1,065,000 units Restricted stock units granted on June 16, 2026

Vesting schedule 25% annually each December 1 Starting December 1, 2026 until fully vested

Holdings after transaction 1,759,183 shares Total direct common stock holdings after grant

Reported grant price $0.0000 per share Compensation award, not open-market purchase

Key Terms

restricted stock units, vest, grant, award, or other acquisition

3 terms

restricted stock units financial

"received an award of 1,065,000 restricted stock units on June 16, 2026"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

vest financial

"which shall vest as follows: (i) 25% on December 1, 2026"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

grant, award, or other acquisition financial

"transaction_code_description": "Grant, award, or other acquisition""

FAQ

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

What insider transaction did SELLAS (SLS) report for its CEO?

SELLAS reported that President and CEO Angelos M. Stergiou received 1,065,000 restricted stock units. The award was granted on June 16, 2026 as equity compensation, with no cash paid per unit and subject to a multi-year vesting schedule.

How do the 1,065,000 RSUs granted to the SELLAS CEO vest?

The 1,065,000 restricted stock units vest over four years. 25% vest on December 1, 2026, and 25% vest on each December 1 afterward until fully vested, assuming the CEO continues in service with SELLAS through each vesting date.

Did the SELLAS CEO buy or sell shares in this Form 4 filing?

The Form 4 shows an acquisition through a grant, not a market trade. Angelos M. Stergiou received 1,065,000 restricted stock units as compensation, with a reported price per share of $0.0000, rather than buying or selling shares on the open market.

What are the SELLAS CEO’s holdings after the RSU award?

After the reported grant, Angelos M. Stergiou’s direct holdings total 1,759,183 shares of SELLAS common stock. This figure reflects his position following the award of 1,065,000 restricted stock units disclosed in the Form 4 filing.

What does transaction code "A" mean in the SELLAS CEO Form 4?

Transaction code "A" indicates a grant, award, or other acquisition. In this case, it represents the compensation-related award of 1,065,000 restricted stock units to the SELLAS CEO, rather than an open-market purchase or sale of the company’s common stock.

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

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Accepted by SEC EDGAR 06/18/2026 - 04:30 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^*

Stergiou Angelos M.

(Last) (First) (Middle)

C/O SELLAS LIFE SCIENCES GROUP, INC.,

7 TIMES SQUARE, SUITE 2503

(Street)

NEW YORK NEW YORK 10036

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
SELLAS Life Sciences Group, Inc. [ SLS ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/16/2026

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
Common Stock	06/16/2026		A		1,065,000(1)	A	$0	1,759,183	D

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

Explanation of Responses:

1. The Reporting Person received an award of 1,065,000 restricted stock units on June 16, 2026, which shall vest as follows: (i) 25% on December 1, 2026 and (ii) 25% on each December 1 thereafter until fully vested, provided that the Reporting Person remains in service with the Issuer through each such vesting date.

	/s/ Kostantinos Skordalos, Power of Attorney For: Angelos M. Stergiou	06/18/2026
	** 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)