Atossa director granted 10,000 restricted stock units

Steinhart Richard I reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Steinhart Richard I reported acquisition or exercise transactions in this Form 4 filing.

Atossa Therapeutics director Richard I. Steinhart received an equity award. He was granted 10,000 shares of common stock in the form of restricted stock units, with no cash price per share reported. Following this grant, he holds 10,000 shares directly.

The footnote explains that each RSU represents a contingent right to receive one share of common stock, and the RSUs will vest on the first anniversary of May 12, 2026. This is a compensation-related award, not an open‑market stock purchase or sale.

Insider Trade Summary

Grant/Award: 10,000 shares

Grant/Award 1 txn

Insider Steinhart Richard I

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	10,000	$0.00	$0.00

Holdings After Transaction: Common Stock — 10,000 shares (Direct)

Footnotes (1)

1. F1. Represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's Common Stock. The RSUs shall vest on the first anniversary of May 12, 2026.

Key Figures

RSU grant size: 10,000 shares Price per share: $0.0000 per share Post-transaction holdings: 10,000 shares

3 metrics

RSU grant size 10,000 shares Restricted stock units granted to director on May 12, 2026

Price per share $0.0000 per share Reported transaction price for RSU grant

Post-transaction holdings 10,000 shares Total common stock held directly after grant

Key Terms

restricted stock units ("RSUs"), contingent right, Common Stock, vest

4 terms

restricted stock units ("RSUs") financial

"Represents a grant of restricted stock units ("RSUs"). Each RSU represents"

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

contingent right financial

"Each RSU represents a contingent right to receive one share of the Issuer's"

Common Stock financial

"Each RSU represents a contingent right to receive one share of the Issuer's Common Stock."

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

vest financial

"The RSUs shall vest on the first anniversary of May 12, 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.

FAQ

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

What insider transaction did ATOS director Richard Steinhart report on this Form 4?

He reported receiving 10,000 restricted stock units as an equity award. Each RSU represents a contingent right to one share of Atossa Therapeutics common stock, increasing his direct holdings to 10,000 shares after the grant.

Is the ATOS Form 4 transaction a stock purchase or a compensation grant?

The Form 4 shows a compensation-related grant, not an open-market purchase. Transaction code A and the footnote describe a grant of restricted stock units awarded to director Richard Steinhart, with no cash price per share listed.

How many ATOS shares does Richard Steinhart hold after this RSU grant?

After the transaction, he holds 10,000 shares directly. The Form 4 lists total shares following the transaction as 10,000, reflecting the full amount of the restricted stock unit award reported in this filing.

When do Richard Steinhart’s ATOS restricted stock units vest?

The RSUs vest on the first anniversary of May 12, 2026. The footnote specifies that the restricted stock units will fully vest on that first anniversary date, at which point each RSU converts into one share of common stock.

What does each ATOS restricted stock unit granted to Richard Steinhart represent?

Each RSU represents a contingent right to receive one share of common stock. The units do not immediately deliver shares; instead, they convert into common stock upon vesting on the first anniversary of May 12, 2026, per the footnote.

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

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Accepted by SEC EDGAR 05/14/2026 - 06:32 PM EDT 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^*

Steinhart Richard I

(Last) (First) (Middle)

CO BIOXCEL THERAPEUTICS, INC.

555 LONG WHARF DRIVE, 12TH FLOOR

(Street)

NEW HAVEN CONNECTICUT 06511

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ATOSSA THERAPEUTICS, INC. [ ATOS ]

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)
05/12/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/12/2026		A		10,000(1)	A	$0	10,000	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. Represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's Common Stock. The RSUs shall vest on the first anniversary of May 12, 2026.

	Richard I. Steinhart	05/14/2026
	** 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)