ALEC offering history
Every offering-related filing in Alector, Inc.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 609 filings back to Sep 16, 2015.
| Date | Filing | What it means | |
|---|---|---|---|
| May 7, 2026 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Apr 30, 2026 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Mar 12, 2026 | S-3 → | REGISTERED | S-3 registration — capacity to sell shares, not a sale yet |
| Jan 19, 2024 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jan 16, 2024 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Nov 7, 2023 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| May 5, 2023 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| May 1, 2023 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Feb 28, 2023 | S-3 → | REGISTERED | S-3 registration — capacity to sell shares, not a sale yet |
| May 13, 2020 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| May 13, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jan 30, 2020 | 424B4 → | EXECUTED | Final prospectus — offering priced (typical for IPOs and marketed share deals) |
| Jan 29, 2020 | S-1/A → | REGISTERED | S-1/A registration — capacity to sell shares, not a sale yet |
| Jan 29, 2020 | S-1MEF → | REGISTERED | S-1MEF registration — capacity to sell shares, not a sale yet |
| Jan 29, 2020 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Jan 27, 2020 | S-1 → | REGISTERED | S-1 registration — capacity to sell shares, not a sale yet |
| Feb 7, 2019 | 424B4 → | EXECUTED | Final prospectus — offering priced (typical for IPOs and marketed share deals) |
| Feb 6, 2019 | S-1/A → | REGISTERED | S-1/A registration — capacity to sell shares, not a sale yet |
| Feb 6, 2019 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Feb 6, 2019 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Jan 29, 2019 | S-1/A → | REGISTERED | S-1/A registration — capacity to sell shares, not a sale yet |
| Jan 7, 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.
ALEC offering FAQ
When did ALEC last execute an offering?
Per SEC filings, Alector, Inc.'s most recent priced offering document is a 424B5 filed 2026-05-07. Note a 424B takedown can price shares or notes (debt) — the linked document says which.
When did ALEC last announce or register an offering?
The most recent registration is a S-3 filed 2026-03-12. 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.