Omeros officer plans sale of 10,906 shares

OMEROS CORP (OMER) received a notice that officer David Joseph Borges intends to sell company common stock under Rule 144.

Rhea-AI Filing Summary

OMEROS CORP (OMER) received a notice that officer David Joseph Borges intends to sell company common stock under Rule 144. The filing covers up to 10,906 shares of common stock, to be obtained by the exercise of stock options and sold for cash, with sales referenced as occurring around 08/21/2026 through a brokerage account at Morgan Stanley Smith Barney LLC on NASDAQ.

The notice also lists a prior sale under a Rule 10b5-1 trading plan in the past three months, where 5,000 shares of common stock were sold for $84,750.00 on 08/13/2026. The remarks state that the securities to be sold were and will be received upon option exercise over the next three months, with the dates of acquisition and payment matching the exercise or sale dates.

Key Figures

Shares to be sold: 10,906 shares of common stock Market value reference: $203,178.78 Past 3-month sale shares: 5,000 shares of common stock +2 more

5 metrics

Shares to be sold 10,906 shares of common stock Planned sale under Rule 144, referenced as of 08/21/2026

Market value reference $203,178.78 Associated with 10,906 common shares in the broker section

Past 3-month sale shares 5,000 shares of common stock 10b5-1 sale on 08/13/2026

Past 3-month sale total value $84,750.00 10b5-1 sale of 5,000 shares on 08/13/2026

Planned sale date reference 08/21/2026 Date associated with securities information and planned sale/exercise

Key Terms

Rule 144, 10b5-1, Exercise of Stock Options

3 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.

10b5-1 regulatory

"10b5-1 Sales for DAVID JOSEPH BORGES 201 Elliott Avenue West"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Exercise of Stock Options financial

"Common | 08/21/2026 | Exercise of Stock Options | Issuer"

FAQ

What does OMER (Omeros Corp) report in this Form 144 filing?

OMER discloses that officer David Joseph Borges filed a Rule 144 notice covering the planned sale of up to 10,906 shares of common stock, to be acquired through stock option exercises and sold for cash via a brokerage account.

How many OMER common shares are covered by David Borges’ planned Rule 144 sale?

The notice covers up to 10,906 shares of OMEROS CORP common stock. These shares are to be received upon the exercise of stock options and then sold for cash, with activity referenced around 08/21/2026.

What prior OMER share sales by David Borges are disclosed in this Form 144?

The filing reports a 10b5-1 plan sale of 5,000 OMER common shares on 08/13/2026 for total proceeds of $84,750.00 during the past three months.

How will David Borges acquire the OMER shares to be sold under this Form 144?

The Form 144 states the securities to be sold were and will be received upon the exercise of stock options. The dates of acquisition and payment are described as the dates of exercise/sale over the next three months.

Which broker and market are involved in the planned OMER share sales?

The broker listed is Morgan Stanley Smith Barney LLC Executive Financial Services, and the OMER common stock is indicated for trading on NASDAQ in connection with the planned Rule 144 sales.

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

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Available on EDGAR 08/21/2026 - 04:43 PM Accepted by SEC EDGAR 08/21/2026 - 04:42 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	0002005787
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	2066765000
Name of Person for Whose Account the Securities are To Be Sold	DAVID BORGES
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	Officer

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	10906	203178.78	72388316	08/21/2026	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	08/21/2026	Exercise of Stock Options	Issuer			10906	08/21/2026	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
10b5-1 Sales for DAVID JOSEPH BORGES 201 Elliott Avenue West SEATTLE WA 98119	Common	08/13/2026	5000	84750.00

144: Remarks and Signature

Remarks	The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.
Date of Notice	08/21/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	02/10/2026
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/ David Joseph Borges
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)