stocktools
Offerings // Lyell Immunopharma, Inc.

LYEL offering history

Every offering-related filing in Lyell Immunopharma, Inc.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 337 filings back to Mar 20, 2020.

Last executed offering
Dec 18, 2025
424B5 — priced deal (shares or notes)
Last registration (announced)
Jul 13, 2026
S-3 — capacity, not a sale
Executed, last 12 months
3
424B pricings + 8-K 3.02 sales
Registered, last 12 months
4
S-1/S-3/F-series registrations
DateFilingWhat it means
Jul 21, 2026EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Jul 13, 2026S-3 →REGISTEREDS-3 registration — capacity to sell shares, not a sale yet
Apr 14, 2026EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Apr 3, 2026S-3 →REGISTEREDS-3 registration — capacity to sell shares, not a sale yet
Dec 18, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 15, 2025EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Dec 5, 2025S-3 →REGISTEREDS-3 registration — capacity to sell shares, not a sale yet
Nov 10, 20258-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Aug 15, 2025EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Aug 12, 2025S-3 →REGISTEREDS-3 registration — capacity to sell shares, not a sale yet
Jul 31, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jul 30, 2025EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Jul 25, 20258-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Jul 18, 2025S-3 →REGISTEREDS-3 registration — capacity to sell shares, not a sale yet
Jun 26, 20258-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Dec 9, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 5, 2024EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Nov 29, 2024S-3 →REGISTEREDS-3 registration — capacity to sell shares, not a sale yet
Oct 24, 20248-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
May 6, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 3, 2024EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Feb 29, 2024S-3 →REGISTEREDS-3 registration — capacity to sell shares, not a sale yet
Aug 4, 2022S-3ASR →REGISTEREDAutomatic shelf registration — effective immediately (large filers)
Jun 21, 2021424B4 →EXECUTEDFinal prospectus — offering priced (typical for IPOs and marketed share deals)
Jun 16, 2021EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Jun 9, 2021S-1/A →REGISTEREDS-1/A registration — capacity to sell shares, not a sale yet
May 25, 2021S-1 →REGISTEREDS-1 registration — capacity to sell shares, not a sale yet
LYEL offering-related filings from SEC EDGAR, newest first (capped at 40). Each links to the original document.

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.

Is a shelf active now? →Do they need money? →Red flags →Full LYEL workspace →
LYEL offering FAQ

When did LYEL last execute an offering?

Per SEC filings, Lyell Immunopharma, Inc.'s most recent priced offering document is a 424B5 filed 2025-12-18. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did LYEL last announce or register an offering?

The most recent registration is a S-3 filed 2026-07-13. 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.