Omeros officer plans $185K sale of 10,000 shares

Omeros officer David Borges has filed notice of intent to sell 10,000 shares via option exercise, alongside recent 10b5-1 plan sales.

Available on EDGAR 09/22/2026 - 04:18 PM EDT Accepted by SEC EDGAR 09/22/2026 - 04:15 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

OMEROS CORPORATION (OMER) has a notice from officer David Borges indicating an intent to sell 10,000 shares of common stock. The shares are to be obtained via exercise of stock options for cash on September 22, 2026, with Morgan Stanley Smith Barney LLC Executive Financial Services listed as broker.

The notice also lists prior Rule 10b5-1 plan sales of Omeros common stock by David Joseph Borges during the past three months, including transactions on August 13, 21, and 24, 2026, with sizes ranging from 906 to 10,000 shares.

Key Figures

Planned shares to be sold: 10,000 shares Broker transaction value (planned): $184,900.00 10b5-1 sale on August 21, 2026: 10,000 shares for $189,500.00 +3 more

6 metrics

Planned shares to be sold 10,000 shares Common stock to be sold by David Borges via option exercise on September 22, 2026

Broker transaction value (planned) $184,900.00 Value associated with 10,000 common shares listed with Morgan Stanley Smith Barney LLC

10b5-1 sale on August 21, 2026 10,000 shares for $189,500.00 Common stock sold by David Joseph Borges under a 10b5-1 plan

10b5-1 sale on August 13, 2026 5,000 shares for $84,750.00 Common stock sale under 10b5-1 plan by David Joseph Borges

10b5-1 sale on August 24, 2026 906 shares for $17,304.60 Common stock sale under 10b5-1 plan by David Joseph Borges

Planned sale date September 22, 2026 Date for exercise of stock options and sale of 10,000 common shares

Key Terms

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

4 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 | 09/22/2026 | Exercise of Stock Options | Issuer"

Common financial

"Common | Morgan Stanley Smith Barney LLC Executive Financial Services"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

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

An officer of Omeros Corporation, David Borges, has filed a notice of intent to sell 10,000 shares of common stock, to be acquired by exercising stock options for cash on September 22, 2026. This is a planned sale under Rule 144.

How many OMER shares does David Borges plan to sell under this notice?

David Borges plans to sell 10,000 shares of Omeros Corporation common stock. The shares are to be obtained through an exercise of stock options for cash on September 22, 2026, according to the notice.

What were the recent 10b5-1 plan sales by David Borges of OMER stock?

The notice lists three Rule 10b5-1 sales of Omeros common stock by David Joseph Borges in 2026: 5,000 shares on August 13 for $84,750.00, 10,000 shares on August 21 for $189,500.00, and 906 shares on August 24 for $17,304.60.

Which broker is involved in the planned OMER share sale by David Borges?

The planned sale of 10,000 Omeros common shares is listed through Morgan Stanley Smith Barney LLC Executive Financial Services, at 1 New York Plaza, 8th Floor, New York, NY 10004, according to the notice.

On what date are the new OMER shares to be acquired for sale by David Borges?

The shares to be sold are to be acquired via exercise of stock options on September 22, 2026. The same date is listed as the date of the proposed sale of the 10,000 Omeros common shares.

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

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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	10000	184900.00	72388316	09/22/2026	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	09/22/2026	Exercise of Stock Options	Issuer			10000	09/22/2026	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	08/24/2026	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
Date of Notice	09/22/2026
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)