SLS offering history
Every offering-related filing in SELLAS Life Sciences Group, Inc.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 1,001 filings back to Apr 21, 2011.
| Date | Filing | What it means | |
|---|---|---|---|
| Mar 20, 2026 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Nov 25, 2025 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Oct 27, 2025 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Oct 10, 2025 | S-3 → | REGISTERED | S-3 registration — capacity to sell shares, not a sale yet |
| Sep 11, 2025 | 8-K → | EXECUTED | Unregistered share sale disclosed (8-K item 3.02) |
| Jan 29, 2025 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 1, 2024 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| May 1, 2024 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| May 1, 2024 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Apr 29, 2024 | S-3/A → | REGISTERED | S-3/A registration — capacity to sell shares, not a sale yet |
| Mar 28, 2024 | S-3 → | REGISTERED | S-3 registration — capacity to sell shares, not a sale yet |
| Mar 28, 2024 | S-3 → | REGISTERED | S-3 registration — capacity to sell shares, not a sale yet |
| Mar 18, 2024 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jan 5, 2024 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jan 4, 2024 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Nov 1, 2023 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Feb 24, 2023 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Feb 23, 2023 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Apr 1, 2022 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Mar 31, 2022 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Apr 29, 2021 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Apr 16, 2021 | S-3 → | REGISTERED | S-3 registration — capacity to sell shares, not a sale yet |
| Dec 14, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 24, 2020 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Aug 14, 2020 | S-3 → | REGISTERED | S-3 registration — capacity to sell shares, not a sale yet |
| Aug 4, 2020 | 8-K → | EXECUTED | Unregistered share sale disclosed (8-K item 3.02) |
| Jun 11, 2020 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Jun 11, 2020 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| May 29, 2020 | S-1 → | REGISTERED | S-1 registration — capacity to sell shares, not a sale yet |
| Jan 10, 2020 | 8-K → | EXECUTED | Unregistered share sale disclosed (8-K item 3.02) |
| Jan 10, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Oct 30, 2019 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Oct 11, 2019 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Oct 4, 2019 | S-3/A → | REGISTERED | S-3/A registration — capacity to sell shares, not a sale yet |
| Sep 20, 2019 | S-3 → | REGISTERED | S-3 registration — capacity to sell shares, not a sale yet |
| Jun 18, 2019 | 424B4 → | EXECUTED | Final prospectus — offering priced (typical for IPOs and marketed share deals) |
| Jun 13, 2019 | S-1/A → | REGISTERED | S-1/A registration — capacity to sell shares, not a sale yet |
| Jun 13, 2019 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Jun 6, 2019 | S-1/A → | REGISTERED | S-1/A registration — capacity to sell shares, not a sale yet |
| May 23, 2019 | S-1 → | REGISTERED | S-1 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.
SLS offering FAQ
When did SLS last execute an offering?
Per SEC filings, SELLAS Life Sciences Group, Inc.'s most recent priced offering document is a 424B5 filed 2025-10-27. Note a 424B takedown can price shares or notes (debt) — the linked document says which.
When did SLS last announce or register an offering?
The most recent registration is a S-3ASR filed 2026-03-20. 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.