Peter B. Cancelmo - 28 Aug 2026 Form 4 Insider Report for OMEROS CORP (OMER)

Reporting relationship: VP, General Counsel
Issuer ticker: OMER
Reported as of: 28 Aug 2026
Net transaction value: -$929,668
SEC form: 4
Accepted by SEC: 01 Sep 2026, 16:41:06 UTC
Prior SEC filing: 24 Jul 2026
Source filing: View source filing
Reporting owner signature: /s/ Peter B. Cancelmo

Key filing fact

Peter B. Cancelmo filed Form 4 for OMEROS CORP (OMER) on 01 Sep 2026.

Key facts

This page summarizes Peter B. Cancelmo's Form 4 filing for OMEROS CORP (OMER).
6 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 01 Sep 2026, 16:41.

Change

Previous filing in this sequence was filed on 24 Jul 2026.
Current net transaction value: -$929,668.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001778968 Primary reporting owner

Cancelmo Peter B

Relationship: VP, General Counsel
Address: 201 ELLIOTT AVENUE WEST, SEATTLE
Signature: /s/ Peter B. Cancelmo
Signature date: 01 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

OMER transaction

Common Stock

Options Exercise

Transaction value
Shares: +25,000
Change %: +12500%
Price: $2.94^*
Shares after: 25,200
Date: 28 Aug 2026
Ownership: Direct

OMER transaction

Common Stock

Sale

Transaction value: $466,128
Shares: -25,000
Change %: -99%
Price: $18.65
Shares after: 200
Date: 28 Aug 2026
Ownership: Direct
Footnotes: F1

OMER transaction

Common Stock

Options Exercise

Transaction value
Shares: +25,000
Change %: +12500%
Price: $2.94^*
Shares after: 25,200
Date: 31 Aug 2026
Ownership: Direct

OMER transaction

Common Stock

Sale

Transaction value: $463,540
Shares: -25,000
Change %: -99%
Price: $18.54
Shares after: 200
Date: 31 Aug 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

OMER transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -25,000
Change %: -25%
Price: $0.000000^*
Shares after: 75,000
Date: 28 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 25,000
Exercise price: $2.94
Footnotes: F3

OMER transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -25,000
Change %: -33%
Price: $0.000000^*
Shares after: 50,000
Date: 31 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 25,000
Exercise price: $2.94
Footnotes: F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

This transaction was executed in multiple trades at prices ranging from $18.55 to $18.77. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions referenced in this footnote were effected upon request to the SEC staff, the issuer, or a security holder of the issuer.

Footnote F2

This transaction was executed in multiple trades at prices ranging from $18.32 to $18.90. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions referenced in this footnote were effected upon request to the SEC staff, the issuer, or a security holder of the issuer.

Footnote F3

This option shall vest and become 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.