Omeros finance VP sells 10,000 shares on each of two days

The VP, Finance & CAO's reported sales were under a Rule 10b5-1 plan adopted February 10, 2026.

Rhea-AI Filing Summary

OMEROS CORP (OMER) VP, Finance & CAO David J. Borges exercised options to acquire 10,000 shares on September 23, 2026, at $15.58 per share, and options for 5,000 shares each at $3.93 and $2.94 on September 22. He sold 10,000 shares on each date at $20.95 per share. Both sales were open-market sales under a Rule 10b5-1 trading plan adopted February 10, 2026.

Insider Trade Summary 10b5-1

Exercise and Sale: 20,000 shares ($229K approx. pre-tax spread)

Exercise and Sale 8 txns

Insider Borges David J.

Role VP, Finance & CAO

Sold 20,000 shs ($419K)

Approx. gross sale proceeds $419K

Approx. exercise cost $190K

Approx. pre-tax spread $229K

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy) F4	10,000	$0.00	$0.00
Exercise	Common Stock	10,000	$15.58	$156K
Sale	Common Stock F1	10,000	$20.95	$210K
Exercise	Stock Option (Right to Buy) F2	5,000	$0.00	$0.00
Exercise	Stock Option (Right to Buy) F3	5,000	$0.00	$0.00
Exercise	Common Stock	5,000	$3.93	$20K
Exercise	Common Stock	5,000	$2.94	$15K
Sale	Common Stock F1	10,000	$20.95	$210K

Holdings After Transaction: Stock Option (Right to Buy) — 24,094 contracts (Direct); Common Stock — 0 shares (Direct)

Footnotes (4)

1. F1. Open market sale pursuant to a previously established Rule 10b5-1 trading plan adopted by the reporting person on February 10, 2026. The trading schedule, including sale periods and the number of shares to be sold, was established at the time of the trading plan's adoption in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.
2. F2. This option vested and became exercisable over 48 equal monthly installments, with a vesting commencement date of April 1, 2022. Installments vested and became exercisable on each monthly anniversary thereafter.
3. F3. This option vests and becomes exercisable over 48 equal monthly installments, with a vesting commencement date of April 1, 2023. Installments vest and become exercisable on each monthly anniversary thereafter.
4. F4. This option vested and became exercisable with respect to 25% of the total number of shares subject to the option on the 12-month anniversary of the vesting commencement date of June 8, 2020, and the remainder of the option vested and became exercisable over 48 equal installments on each monthly anniversary thereafter.

Key Figures

Shares acquired through option exercise: 10,000 shares Exercise price: $15.58 per share Shares acquired through option exercise: 5,000 shares +3 more

6 metrics

Shares acquired through option exercise 10,000 shares September 23, 2026; exercise price $15.58 per share

Exercise price $15.58 per share Options exercised September 23, 2026

Shares acquired through option exercise 5,000 shares September 22, 2026; exercise price $3.93 per share

Exercise price $3.93 per share Options exercised September 22, 2026

Shares acquired through option exercise 5,000 shares September 22, 2026; exercise price $2.94 per share

Sale price $20.95 per share 10,000 shares sold on each of September 22 and September 23, 2026

Key Terms

Rule 10b5-1 trading plan, exercise price, vesting commencement date

3 terms

Rule 10b5-1 trading plan regulatory

"pursuant to a previously established Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

exercise price financial

"exercise price of $15.58"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

vesting commencement date financial

"vesting commencement date of June 8, 2020"

The vesting commencement date is the starting point when an employee begins earning ownership rights to their promised benefits, such as stock options or retirement contributions. Think of it like the day a savings account is opened—only after this date do the benefits start to grow and become fully available over time. It matters to investors because it marks when the clock begins ticking toward full ownership, affecting the timing and value of these benefits.

FAQ

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

When do David J. Borges's exercised OMER options expire?

The options exercised for 10,000 shares at $15.58 expire June 7, 2030; those exercised for 5,000 shares at $3.93 expire September 20, 2032; and those for 5,000 shares at $2.94 expire September 21, 2033.

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

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Available on EDGAR 09/24/2026 - 09:01 PM Accepted by SEC EDGAR 09/24/2026 - 09:00 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Borges David J.

(Last) (First) (Middle)

201 ELLIOTT AVENUE WEST

(Street)

SEATTLE WASHINGTON 98119

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
OMEROS CORP [ OMER ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	VP, Finance & CAO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/22/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/22/2026		M		5,000	A	$3.93	5,000	D
Common Stock	09/22/2026		M		5,000	A	$2.94	10,000	D
Common Stock	09/22/2026		S(1)		10,000	D	$20.95	0	D
Common Stock	09/23/2026		M		10,000	A	$15.58	10,000	D
Common Stock	09/23/2026		S(1)		10,000	D	$20.95	0	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (Right to Buy)	$3.93	09/22/2026		M			5,000	(2)	09/20/2032	Common Stock	5,000	$0	4,094	D
Stock Option (Right to Buy)	$2.94	09/22/2026		M			5,000	(3)	09/21/2033	Common Stock	5,000	$0	15,000	D
Stock Option (Right to Buy)	$15.58	09/23/2026		M			10,000	(4)	06/07/2030	Common Stock	10,000	$0	5,000	D

Explanation of Responses:

1. Open market sale pursuant to a previously established Rule 10b5-1 trading plan adopted by the reporting person on February 10, 2026. The trading schedule, including sale periods and the number of shares to be sold, was established at the time of the trading plan's adoption in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.

2. This option vested and became exercisable over 48 equal monthly installments, with a vesting commencement date of April 1, 2022. Installments vested and became exercisable on each monthly anniversary thereafter.

3. This option vests and becomes exercisable over 48 equal monthly installments, with a vesting commencement date of April 1, 2023. Installments vest and become exercisable on each monthly anniversary thereafter.

4. This option vested and became exercisable with respect to 25% of the total number of shares subject to the option on the 12-month anniversary of the vesting commencement date of June 8, 2020, and the remainder of the option vested and became exercisable over 48 equal installments on each monthly anniversary thereafter.

	/s/ Peter B. Cancelmo, Attorney-in-Fact	09/24/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)