Atossa CEO granted 65,000 RSUs in stock award

QUAY STEVEN C reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

QUAY STEVEN C reported acquisition or exercise transactions in this Form 4 filing.

ATOSSA THERAPEUTICS, INC. President & CEO Steven C. Quay received an equity grant of 65,000 restricted stock units of Common Stock. These RSUs vest in three equal annual installments on the first three anniversaries of March 26, 2026. Following the grant, he directly holds 88,038 shares of Common Stock and has indirect ownership of 1,483 shares through Ensisheim Partners, LLC, an entity he wholly owns with Dr. Shu-Chih Chen. The share counts have been adjusted to reflect a one-for-fifteen reverse stock split of Common Stock that occurred on February 2, 2026.

Insider Trade Summary

Grant/Award: 65,000 shares

Grant/Award 2 txns

Insider QUAY STEVEN C

Role President & CEO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	65,000	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 88,038 shares (Direct); Common Stock — 1,483 shares (Indirect, By Ensisheim Partners, LLC)

Footnotes (3)

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 in three equal annual installments on the first three anniversaries of March 26, 2026.
2. F2. On February 2, 2026, the Issuer effected a one-for-fifteen reverse stock split of its Common Stock (the "Reverse Stock Split"). The number of securities reported on this Form 4 has been adjusted to reflect the Reverse Stock Split.
3. F3. Ensisheim Partners, LLC ("Ensisheim") is wholly owned by the Reporting Person and Dr. Shu-Chih Chen. The Reporting Person and Dr. Chen share voting and investment power over the securities held by Ensisheim. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.

Key Figures

RSU grant size: 65,000 RSUs Direct holdings after grant: 88,038 shares Indirect holdings via Ensisheim: 1,483 shares +2 more

5 metrics

RSU grant size 65,000 RSUs Restricted stock units granted on March 27, 2026

Direct holdings after grant 88,038 shares Common Stock directly held following the RSU grant

Indirect holdings via Ensisheim 1,483 shares Common Stock held indirectly by Ensisheim Partners, LLC

Reverse split ratio 1-for-15 Reverse stock split of Common Stock effective February 2, 2026

Vesting schedule 3 equal annual installments RSUs vest on first three anniversaries of March 26, 2026

Key Terms

restricted stock units ("RSUs"), reverse stock split, pecuniary interest, indirect ownership

4 terms

restricted stock units ("RSUs") financial

"Represents a grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share"

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.

reverse stock split financial

"the Issuer effected a one-for-fifteen reverse stock split of its Common Stock"

A reverse stock split reduces a company's number of outstanding shares while raising the price per share proportionally, so the total value of each investor's holding is unchanged; a 1-for-10 split turns 100 shares worth $1 each into 10 shares worth $10 each. Companies often do this to regain compliance with an exchange's minimum price rule or to attract investors who avoid very low-priced stocks.

pecuniary interest financial

"The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein"

indirect ownership financial

"Ensisheim Partners, LLC ("Ensisheim") is wholly owned by the Reporting Person and Dr. Shu-Chih Chen"

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Accepted by SEC EDGAR 03/31/2026 - 04:57 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^*

QUAY STEVEN C

(Last) (First) (Middle)

C/O ATOSSA THERAPEUTICS, INC.,

1448 NW MARKET STREET, SUITE 500

(Street)

SEATTLE WASHINGTON 98107

(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
X	Officer (give title below)		Other (specify below)
	President & CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/27/2026

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	03/27/2026		A		65,000(1)	A	$0	88,038(2)	D
Common Stock								1,483(2)	I	By Ensisheim Partners, LLC(3)

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 in three equal annual installments on the first three anniversaries of March 26, 2026.

2. On February 2, 2026, the Issuer effected a one-for-fifteen reverse stock split of its Common Stock (the "Reverse Stock Split"). The number of securities reported on this Form 4 has been adjusted to reflect the Reverse Stock Split.

3. Ensisheim Partners, LLC ("Ensisheim") is wholly owned by the Reporting Person and Dr. Shu-Chih Chen. The Reporting Person and Dr. Chen share voting and investment power over the securities held by Ensisheim. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.

	Steven C. Quay	03/31/2026
	** 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)