Were the OMER share sale prices in this Form 4 single trades or averages?

Each reported sale price is a weighted average sales price. Footnotes explain that the shares were sold in multiple trades within ranges of $18.50–$18.56, $18.85–$18.92, and $19.00–$19.10, with the averages of $18.5265, $18.8762, and $19.0161 reported.

Omeros director sells 15,000 shares after option exercise

Q: What did OMER (OMEROS CORP) director Arnold C. Hanish report in this Form 4?

He reported exercising stock options for 15,000 shares of OMER common stock and selling 15,000 shares in open-market transactions on August 26–27, 2026, along with an indirect holding of 12,400 shares in a living trust that were not sold.

Q: How many OMER shares did Arnold C. Hanish sell according to this Form 4?

He sold a total of 15,000 shares of OMER common stock in three open-market transactions: 5,000 shares at a weighted average price of $18.5265, 5,000 at $18.8762, and 5,000 at $19.0161 per share.

Q: What stock options did Arnold C. Hanish exercise in OMER shares?

He exercised options covering 15,000 shares of OMER common stock: 7,500 shares at an exercise price of $14.6600 per share and 7,500 shares at $15.8100 per share, through multiple transactions on August 26–27, 2026.

Q: What OMER shares does Arnold C. Hanish still hold indirectly after these transactions?

An indirect position of 12,400 shares of OMER common stock is reported as held of record by the Arnold C. Hanish Living Trust. A footnote states these shares have not been sold and are held by the trust, for which he is the sole trustee.

OMEROS CORP (OMER) director Arnold C. Hanish reported option exercises and related share sales.

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

OMEROS CORP (OMER) director Arnold C. Hanish reported option exercises and related share sales. On August 26–27, 2026, he exercised stock options for 15,000 shares of common stock at exercise prices of $14.66 and $15.81 per share, then sold 15,000 shares in open-market transactions at weighted average prices between about $18.53 and $19.02 per share. A separate indirect holding of 12,400 shares is reported as held by the Arnold C. Hanish Living Trust, which has not sold these shares.

Insider Trade Summary

Exercise and Sale: 15,000 shares ($54K approx. pre-tax spread)

Exercise and Sale 10 txns

Insider HANISH ARNOLD C

Role Director

Sold 15,000 shs ($282K)

Approx. gross sale proceeds $282K

Approx. exercise cost $229K

Approx. pre-tax spread $54K

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy)	2,500	$0.00	$0.00
Exercise	Stock Option (Right to Buy)	7,500	$0.00	$0.00
Exercise	Common Stock	2,500	$15.81	$40K
Exercise	Common Stock	7,500	$14.66	$110K
Sale	Common Stock ^F2	5,000	$18.8762	$94K
Sale	Common Stock ^F3	5,000	$19.0161	$95K
Exercise	Stock Option (Right to Buy)	5,000	$0.00	$0.00
Exercise	Common Stock	5,000	$15.81	$79K
Sale	Common Stock ^F1	5,000	$18.5265	$93K
holding	Common Stock ^F4	--	--	--

Holdings After Transaction: Stock Option (Right to Buy) — 0 contracts (Direct); Common Stock — 0 shares (Direct); Common Stock — 12,400 shares (Indirect, Arnold C. Hanish Living Trust)

Footnotes (4)

F1. This transaction was executed in multiple trades at prices ranging from $18.50 to $18.56. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions referenced in this footnote were effected upon request to the SEC staff, the issuer, or a security holder of the issuer.
F2. This transaction was executed in multiple trades at prices ranging from $18.85 to $18.92. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions referenced in this footnote were effected upon request to the SEC staff, the issuer, or a security holder of the issuer.
F3. This transaction was executed in multiple trades at prices ranging from $19.00 to $19.10. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions referenced in this footnote were effected upon request to the SEC staff, the issuer, or a security holder of the issuer.
F4. These shares have not been sold and are held of record by the Arnold C. Hanish Living Trust, for which the reporting person serves as sole trustee.

Key Figures

Options exercised: 15,000 shares Exercise prices: $14.6600 and $15.8100 per share Shares sold: 15,000 shares +4 more

7 metrics

Options exercised 15,000 shares Stock options exercised into OMER common stock on August 26–27, 2026

Exercise prices $14.6600 and $15.8100 per share Conversion or exercise prices for stock options exercised into common stock

Shares sold 15,000 shares Total OMER common shares sold in open-market transactions on August 26–27, 2026

Sale price (weighted average) 2026-08-26 $18.5265 per share 5,000 OMER shares sold in multiple trades with prices from $18.50 to $18.56

Sale price (weighted average) 2026-08-27 batch 1 $18.8762 per share 5,000 OMER shares sold in multiple trades with prices from $18.85 to $18.92

Sale price (weighted average) 2026-08-27 batch 2 $19.0161 per share 5,000 OMER shares sold in multiple trades with prices from $19.00 to $19.10

Indirect holdings after transactions 12,400 shares OMER common stock held by the Arnold C. Hanish Living Trust as of August 26, 2026

Key Terms

Stock Option (Right to Buy), weighted average sales price, open market or private transaction, indirect ownership, +1 more

5 terms

Stock Option (Right to Buy) financial

"security_title: "Stock Option (Right to Buy)" for derivative entries"

weighted average sales price financial

"The price reported above reflects the weighted average sales price."

open market or private transaction financial

"transaction_code_description: "Sale in open market or private transaction""

indirect ownership financial

"ownership_type: "indirect" with nature "Arnold C. Hanish Living Trust""

beneficial ownership limitation financial

"These shares have not been sold and are held of record by the ... Trust"

A beneficial ownership limitation is a rule that caps the percentage of a company’s shares an investor can be treated as owning or controlling for voting, regulatory or tax purposes. It matters to investors because it can restrict how many shares a person or group can buy or vote, affect takeover chances, and influence share liquidity and value — like a speed limit that prevents any single driver from taking over the whole road.

FAQ

What did OMER (OMEROS CORP) director Arnold C. Hanish report in this Form 4?

He reported exercising stock options for 15,000 shares of OMER common stock and selling 15,000 shares in open-market transactions on August 26–27, 2026, along with an indirect holding of 12,400 shares in a living trust that were not sold.

How many OMER shares did Arnold C. Hanish sell according to this Form 4?

He sold a total of 15,000 shares of OMER common stock in three open-market transactions: 5,000 shares at a weighted average price of $18.5265, 5,000 at $18.8762, and 5,000 at $19.0161 per share.

What stock options did Arnold C. Hanish exercise in OMER shares?

He exercised options covering 15,000 shares of OMER common stock: 7,500 shares at an exercise price of $14.6600 per share and 7,500 shares at $15.8100 per share, through multiple transactions on August 26–27, 2026.

What OMER shares does Arnold C. Hanish still hold indirectly after these transactions?

An indirect position of 12,400 shares of OMER common stock is reported as held of record by the Arnold C. Hanish Living Trust. A footnote states these shares have not been sold and are held by the trust, for which he is the sole trustee.

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Available on EDGAR 08/28/2026 - 04:32 PM Accepted by SEC EDGAR 08/28/2026 - 04:31 PM

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^*

HANISH ARNOLD C

(Last)

(First)

(Middle)

201 ELLIOTT AVENUE WEST

(Street)

SEATTLE

WASHINGTON

98119

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
OMEROS CORP [ OMER ]

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)
08/26/2026

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)
Common Stock	08/26/2026		M		5,000	A	$15.81	5,000	D
Common Stock	08/26/2026		S		5,000	D	$18.5265⁽¹⁾	0	D
Common Stock	08/27/2026		M		2,500	A	$15.81	2,500	D
Common Stock	08/27/2026		M		7,500	A	$14.66	10,000	D
Common Stock	08/27/2026		S		5,000	D	$18.8762⁽²⁾	5,000	D
Common Stock	08/27/2026		S		5,000	D	$19.0161⁽³⁾	0	D
Common Stock								12,400⁽⁴⁾	I	Arnold C. Hanish Living Trust

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)	$15.81	08/26/2026		M			5,000	06/16/2022	06/10/2031	Common Stock	5,000	$0	2,500	D
Stock Option (Right to Buy)	$15.81	08/27/2026		M			2,500	06/16/2022	06/10/2031	Common Stock	2,500	$0	0	D
Stock Option (Right to Buy)	$14.66	08/27/2026		M			7,500	06/10/2021	06/04/2030	Common Stock	7,500	$0	0	D

Explanation of Responses:

1. This transaction was executed in multiple trades at prices ranging from $18.50 to $18.56. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions referenced in this footnote were effected upon request to the SEC staff, the issuer, or a security holder of the issuer.

2. This transaction was executed in multiple trades at prices ranging from $18.85 to $18.92. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions referenced in this footnote were effected upon request to the SEC staff, the issuer, or a security holder of the issuer.

3. This transaction was executed in multiple trades at prices ranging from $19.00 to $19.10. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions referenced in this footnote were effected upon request to the SEC staff, the issuer, or a security holder of the issuer.

4. These shares have not been sold and are held of record by the Arnold C. Hanish Living Trust, for which the reporting person serves as sole trustee.

	/s/ Peter B. Cancelmo, Attorney-in-Fact	08/28/2026
	** 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