stocktools
Offerings // Phio Pharmaceuticals Corp.

PHIO offering history

Every offering-related filing in Phio Pharmaceuticals Corp.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 892 filings back to Oct 25, 2011.

Last executed offering
Apr 8, 2026
424B5 — priced deal (shares or notes)
Last registration (announced)
Nov 20, 2025
S-3 — capacity, not a sale
Executed, last 12 months
2
424B pricings + 8-K 3.02 sales
Registered, last 12 months
1
S-1/S-3/F-series registrations
DateFilingWhat it means
Apr 8, 2026424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 4, 2025424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Dec 3, 2025EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Nov 20, 2025S-3 →REGISTEREDS-3 registration — capacity to sell shares, not a sale yet
Nov 6, 20258-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Aug 27, 2025424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Aug 22, 2025EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Aug 15, 2025S-3 →REGISTEREDS-3 registration — capacity to sell shares, not a sale yet
Jul 30, 20258-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Jan 29, 2025424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Jan 28, 2025EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Jan 21, 2025S-1 →REGISTEREDS-1 registration — capacity to sell shares, not a sale yet
Jan 17, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jan 17, 20258-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Jan 15, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jan 15, 20258-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Jan 14, 2025424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 26, 20248-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Dec 23, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 20, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 20, 20248-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Aug 5, 2024424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Aug 1, 2024EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Jul 26, 2024S-1 →REGISTEREDS-1 registration — capacity to sell shares, not a sale yet
Jul 12, 20248-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Jul 1, 2024EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
May 20, 2024RW →WITHDRAWNRegistration withdrawn
May 20, 2024S-3 →REGISTEREDS-3 registration — capacity to sell shares, not a sale yet
May 17, 2024424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 17, 2024S-1 →REGISTEREDS-1 registration — capacity to sell shares, not a sale yet
Dec 28, 2023424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Dec 27, 2023EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Dec 19, 2023S-1 →REGISTEREDS-1 registration — capacity to sell shares, not a sale yet
Dec 8, 20238-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Jun 20, 2023424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
Jun 16, 2023EFFECT →EFFECTIVESEC declared a registration effective — selling can begin
Jun 8, 2023S-1 →REGISTEREDS-1 registration — capacity to sell shares, not a sale yet
Jun 2, 20238-K →EXECUTEDUnregistered share sale disclosed (8-K item 3.02)
Jun 1, 2023424B5 →EXECUTEDShelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 10, 2023424B3 →UPDATEProspectus update — often a resale registration, not necessarily new capital
PHIO 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 PHIO workspace →
PHIO offering FAQ

When did PHIO last execute an offering?

Per SEC filings, Phio Pharmaceuticals Corp.'s most recent priced offering document is a 424B5 filed 2026-04-08. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did PHIO last announce or register an offering?

The most recent registration is a S-3 filed 2025-11-20. 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.