Omeros officer proposes $314K sale of 14,927 shares

The contemplated shares are tied to stock-option exercises over the next three months, while earlier transactions are separately labeled as 10b5-1 sales.

Rhea-AI Filing Summary

OMEROS CORP officer David Borges gave notice of a proposed sale of 14,927 common shares through Morgan Stanley Smith Barney LLC, with an aggregate market value of $314,213.35. The notice lists September 23, 2026 as the approximate sale date. The remarks state that the securities to be sold were and will be received upon exercise of stock options over the next three months; acquisition and payment dates were and will be the dates of exercise/sale.

The notice also lists earlier sales as “10b5-1 Sales” for David Joseph Borges: 10,000 shares on September 22, 2026 for $209,500; 906 shares on August 24, 2026 for $17,304.60; 10,000 shares on August 21, 2026 for $189,500; and 5,000 shares on August 13, 2026 for $84,750.

Key Figures

Proposed sale: 14,927 common shares Aggregate market value: $314,213.35 Approximate sale date: September 23, 2026 +4 more

7 metrics

Proposed sale 14,927 common shares David Borges; through Morgan Stanley Smith Barney LLC

Aggregate market value $314,213.35 Proposed sale

Approximate sale date September 23, 2026 Proposed sale

Prior 10b5-1 sale 10,000 shares; $209,500 September 22, 2026; David Joseph Borges

Prior 10b5-1 sale 906 shares; $17,304.60 August 24, 2026; David Joseph Borges

Prior 10b5-1 sale 10,000 shares; $189,500 August 21, 2026; David Joseph Borges

Prior 10b5-1 sale 5,000 shares; $84,750 August 13, 2026; David Joseph Borges

Key Terms

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

3 terms

Rule 144 regulatory

"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 Sales regulatory

"10b5-1 Sales for DAVID JOSEPH BORGES"

10b5-1 sales are pre-arranged stock-trading plans that let company insiders automatically buy or sell shares according to a fixed schedule or formula, even if they later learn confidential information. Think of it as setting up an automatic thermostat for trades: it creates a clear, documented path that can protect insiders from insider-trading accusations and gives investors a signal about predictable insider activity—though it can also simply be a way for insiders to diversify or raise cash.

Exercise of Stock Options financial

"Exercise of Stock Options"

FAQ

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How many OMER shares is David Borges proposing to sell?

David Borges gave notice of a proposed sale of 14,927 OMEROS common shares, with an aggregate market value of $314,213.35, through Morgan Stanley Smith Barney LLC.

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

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Available on EDGAR 09/23/2026 - 04:21 PM Accepted by SEC EDGAR 09/23/2026 - 04:20 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	14927	314213.35	72388316	09/23/2026	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	09/23/2026	Exercise of Stock Options	Issuer			14927	09/23/2026	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	09/22/2026	10000	209500.00
10b5-1 Sales for DAVID JOSEPH BORGES 201 Elliott Avenue West SEATTLE WA 98119	Common	08/24/2026	906	17304.60
10b5-1 Sales for DAVID JOSEPH BORGES 201 Elliott Avenue West SEATTLE WA 98119	Common	08/21/2026	10000	189500.00
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	09/23/2026
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 Borges
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)