Thomas J. Cable - 22 May 2026 Form 4 Insider Report for OMEROS CORP (OMER)

Reporting relationship: Director
Issuer ticker: OMER
Reported as of: 22 May 2026
Net transaction value: -$87,039
SEC form: 4
Accepted by SEC: 27 May 2026, 18:21:29 UTC
Prior SEC filing: 01 Jul 2025
Next SEC filing: 22 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Peter B. Cancelmo, Attorney-in-Fact

Key filing fact

Thomas J. Cable filed Form 4 for OMEROS CORP (OMER) on 27 May 2026.

Key facts

This page summarizes Thomas J. Cable's Form 4 filing for OMEROS CORP (OMER).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 27 May 2026, 18:21.

Change

Previous filing in this sequence was filed on 01 Jul 2025.
Current net transaction value: -$87,039.

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 0001472158 Primary reporting owner

Cable Thomas J.

Relationship: Director
Address: 201 ELLIOTT AVENUE WEST, SEATTLE
Signature: /s/ Peter B. Cancelmo, Attorney-in-Fact
Signature date: 27 May 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: +7,500
Change %: +21%
Price: $10.84^*
Shares after: 42,567
Date: 22 May 2026
Ownership: Direct

OMER transaction

Common Stock

Sale

Transaction value: $87,039
Shares: -7,500
Change %: -18%
Price: $11.61
Shares after: 35,067
Date: 22 May 2026
Ownership: Direct
Footnotes: F1, 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: -7,500
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 22 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 7,500
Exercise price: $10.84

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

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 2 footnotes

Footnote F1

Open market sale pursuant to a previously established Rule 10b5-1 trading plan adopted by the reporting person on June 14, 2024. 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. The shares sold were acquired upon the exercise of vested stock options scheduled to expire on June 9, 2026.

Footnote F2

This transaction was executed in multiple trades at prices ranging from $11.46 to $11.93. 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.