OMER offering history
Every offering-related filing in OMEROS CORP’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 789 filings back to Mar 31, 2004.
| Date | Filing | What it means | |
|---|---|---|---|
| Nov 14, 2025 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Nov 14, 2025 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jul 25, 2025 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| May 15, 2025 | 8-K → | EXECUTED | Unregistered share sale disclosed (8-K item 3.02) |
| Nov 18, 2022 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Nov 18, 2022 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Nov 17, 2022 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Nov 9, 2022 | S-3 → | REGISTERED | S-3 registration — capacity to sell shares, not a sale yet |
| May 10, 2022 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Mar 1, 2021 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 13, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 13, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 12, 2020 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Aug 10, 2020 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Aug 10, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 10, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jan 13, 2020 | AW → | WITHDRAWN | Registration withdrawn |
| Dec 6, 2019 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Dec 4, 2019 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Dec 4, 2019 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Nov 15, 2018 | 8-K → | EXECUTED | Unregistered share sale disclosed (8-K item 3.02) |
| Aug 16, 2017 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 14, 2017 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Aug 14, 2017 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 15, 2016 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 10, 2016 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 10, 2016 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Apr 22, 2016 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Apr 22, 2016 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Apr 22, 2016 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Mar 15, 2016 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jan 6, 2016 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jan 30, 2015 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jan 28, 2015 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jan 16, 2015 | RW → | WITHDRAWN | Registration withdrawn |
| Jan 16, 2015 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Mar 17, 2014 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Mar 13, 2014 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Mar 13, 2014 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Oct 17, 2013 | S-3 → | REGISTERED | S-3 registration — capacity to sell shares, not a sale yet |
Two honest limits. (1) A 424B takedown can price shares or notes— EDGAR’s metadata doesn’t say which, so open the document: large investment-grade filers use these mostly for bond deals (no dilution), small-caps mostly for shares. (2) At-the-market (ATM) programs sell shares gradually and individual sales are not separately filed — the visible footprint is the enabling shelf and its 424B5; actual ATM share counts surface later in the 10-Q/10-K share count. Educational information from public filings, not investment advice.
OMER offering FAQ
When did OMER last execute an offering?
Per SEC filings, OMEROS CORP's most recent priced offering document is a 424B5 filed 2025-11-14. Note a 424B takedown can price shares or notes (debt) — the linked document says which.
When did OMER last announce or register an offering?
The most recent registration is a S-3ASR filed 2025-11-14. A registration is capacity to sell shares — not a sale.
Does an offering always mean dilution?
Registered direct offerings and shelf takedowns issue new shares and dilute existing holders. Resale registrations (424B3/B7) let existing holders sell and do not create new shares. Secondary sales by insiders also do not dilute. Each row here is labeled with what it is.