Omeros director plans sale of 15,000 shares

OMEROS CORP (symbol OMER) has a notice from director Thomas Cable to sell common stock under Rule 144.

Rhea-AI Filing Summary

OMEROS CORP (symbol OMER) has a notice from director Thomas Cable to sell common stock under Rule 144. The filing lists up to 15,000 shares of common stock to be sold through Morgan Stanley Smith Barney LLC, with an indicated aggregate market value of $276,772.50. The shares are to come from the exercise of options under a registered plan, in two tranches of 7,500 shares each on 08/20/2026, with cash exercise. The notice also reports that Cable sold 7,500 shares of common stock for $86,806.20 on 05/22/2026 during the prior three months.

Key Figures

Shares of common stock to be sold: 15,000 shares Aggregate market value of proposed sale: $276,772.50 Planned option exercise tranches: 7,500 shares and 7,500 shares +2 more

5 metrics

Shares of common stock to be sold 15,000 shares Proposed sale of Omeros Corp common stock under Rule 144

Aggregate market value of proposed sale $276,772.50 Estimated for the 15,000 shares covered by the notice

Planned option exercise tranches 7,500 shares and 7,500 shares Exercises of options under a registered plan on 08/20/2026

Shares sold in prior 3 months 7,500 shares Sale by Thomas Cable on 05/22/2026

Proceeds from prior 3‑month sale $86,806.20 Common stock sale on 05/22/2026

Key Terms

Rule 144, Exercise of Options Under a Registered Plan, aggregate market value, Executive Financial Services

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.

Exercise of Options Under a Registered Plan financial

"Common | 08/20/2026 | Exercise of Options Under a Registered Plan"

aggregate market value financial

"Common | Morgan Stanley Smith Barney LLC ... | 15000 | 276772.50"

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.

Executive Financial Services financial

"Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza"

FAQ

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

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

It discloses that director Thomas Cable intends to sell up to 15,000 shares of OMER common stock under Rule 144, sourced from option exercises under a registered plan, with an indicated aggregate market value of $276,772.50 and sales planned around 08/20/2026.

How many OMER shares is Thomas Cable planning to sell under this notice?

The notice covers up to 15,000 shares of Omeros Corp common stock. These are listed to be sold through Morgan Stanley Smith Barney LLC and are expected to result from the exercise of options under a registered plan in two tranches of 7,500 shares each.

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

The filing lists an aggregate market value of approximately $276,772.50 for the 15,000 shares of OMER common stock covered by the notice of proposed sale under Rule 144.

When are the option exercises and potential sales of OMER shares expected to occur?

The Form 144 indicates that the exercise of options under a registered plan and related sales of 7,500 shares plus another 7,500 shares are tied to the date 08/20/2026, with the exercises to be paid in cash.

What OMER share sales has Thomas Cable made in the last three months?

The filing reports that Thomas Cable sold 7,500 shares of Omeros Corp common stock on 05/22/2026, for total proceeds of $86,806.20, during the three months preceding the new proposed sale.

Who is the broker for the proposed OMER share sales in this Form 144?

The proposed sale of up to 15,000 shares of OMER common stock is listed to be executed through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004.

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

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Available on EDGAR 08/20/2026 - 04:24 PM Accepted by SEC EDGAR 08/20/2026 - 04:23 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	0001472158
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	THOMAS CABLE
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	15000	276772.50	72388316	08/20/2026	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	08/20/2026	Exercise of Options Under a Registered Plan	Issuer			7500	08/20/2026	Cash
Common	08/20/2026	Exercise of Options Under a Registered Plan	Issuer			7500	08/20/2026	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
Thomas Cable 201 Elliott Avenue West Seattle WA 98119	Common	05/22/2026	7500	86806.20

144: Remarks and Signature

Remarks
Date of Notice	08/20/2026
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/ Thomas James Cable
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)