Omeros director plans $189K stock sale after option exercise

OMEROS CORPORATION (OMER) received a notice under Rule 144 that director Arnold C. Hanish intends to sell up to 10,000 shares of common stock.

Rhea-AI Filing Summary

OMEROS CORPORATION (OMER) received a notice under Rule 144 that director Arnold C. Hanish intends to sell up to 10,000 shares of common stock. The shares relate to option exercises under a registered plan and are to be handled through Morgan Stanley Smith Barney LLC Executive Financial Services.

The filing also lists that, during the prior three months, Arnold Hanish sold 5,000 shares of OMEROS common stock for $94,132.50.

Key Figures

Shares proposed to be sold: 10,000 shares of common stock Aggregate market value of proposed sale: $189,461.50 Options exercise tranche 1: 2,500 shares +3 more

6 metrics

Shares proposed to be sold 10,000 shares of common stock Total shares covered by the Rule 144 notice

Aggregate market value of proposed sale $189,461.50 Value associated with 10,000 Omeros common shares

Options exercise tranche 1 2,500 shares Common stock from exercise of options under a registered plan dated 08/27/2026

Options exercise tranche 2 7,500 shares Common stock from exercise of options under a registered plan dated 08/27/2026

Shares sold in past 3 months 5,000 shares Common stock sold on 08/26/2026 by Arnold Hanish

Proceeds from past 3-month sale $94,132.50 Total for 5,000 Omeros shares sold on 08/26/2026

Key Terms

Rule 144, Exercise of Options Under a Registered Plan, aggregate market value, Securities To Be Sold, +1 more

5 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Exercise of Options Under a Registered Plan financial

"Common | 08/27/2026 | Exercise of Options Under a Registered Plan | Issuer"

aggregate market value financial

"Common | Morgan Stanley Smith Barney LLC Executive Financial Services ... | 10000 | 189461.50"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

Securities To Be Sold regulatory

"144: Securities To Be Sold"

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months"

FAQ

What does the Form 144 filing disclose for OMER (Omeros Corporation)?

The Form 144 filing discloses that director Arnold C. Hanish plans to sell up to 10,000 shares of Omeros Corporation common stock under Rule 144, following option exercises under a registered plan and using Morgan Stanley Smith Barney LLC Executive Financial Services as broker.

How many OMER shares are proposed to be sold and how are they sourced?

The filing reports a proposed sale of 10,000 shares of Omeros common stock. These are tied to the exercise of options under a registered plan, shown as two tranches of 2,500 and 7,500 shares, each dated 08/27/2026 and to be paid in cash.

What is the aggregate market value of the OMER shares covered by this Form 144?

The Form 144 lists an aggregate market value of $189,461.50 for the 10,000 Omeros common shares subject to the notice. This value is reported in the securities information section alongside the planned Rule 144 sale disclosure.

Were any OMER shares sold by Arnold Hanish in the last three months?

Yes. The filing reports that 5,000 shares of Omeros common stock were sold by Arnold Hanish on 08/26/2026 for total proceeds of $94,132.50, listed in the section covering securities sold during the past three months.

Who is the broker for the planned OMER share sale under Rule 144?

The notice identifies Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, as the broker for the proposed sale of 10,000 Omeros common shares under Rule 144. The shares are listed as trading on NASDAQ.

What is the relationship of Arnold Hanish to OMER (Omeros Corporation)?

The Form 144 identifies Arnold C. Hanish as a Director of Omeros Corporation. The notice is filed for sales of Omeros common stock for his account in accordance with the requirements of Rule 144.

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

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Available on EDGAR 08/27/2026 - 04:13 PM Accepted by SEC EDGAR 08/27/2026 - 04:12 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001233253
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	OMEROS CORPORATION
SEC File Number	001-34475
Address of Issuer	201 Elliott Avenue West Seattle WASHINGTON 98119
Phone	206-676-5000
Name of Person for Whose Account the Securities are To Be Sold	ARNOLD HANISH
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	10000	189461.50	72388316	08/27/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	08/27/2026	Exercise of Options Under a Registered Plan	Issuer			2500	08/27/2026	Cash
Common	08/27/2026	Exercise of Options Under a Registered Plan	Issuer			7500	08/27/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
ARNOLD HANISH 201 Elliott Avenue West Seattle WA 98119	Common	08/26/2026	5000	94132.50

144: Remarks and Signature

Remarks
Date of Notice	08/27/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Arnold C Hanish
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)