Offerings // Ideal Power Inc.

IPWR offering history

Every offering-related filing in Ideal Power Inc.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 448 filings back to Dec 22, 2010.

Last executed offering

May 18, 2026

424B5 — priced deal (shares or notes)

Last registration (announced)

Jul 10, 2026

S-3 — capacity, not a sale

Executed, last 12 months

424B pricings + 8-K 3.02 sales

Registered, last 12 months

S-1/S-3/F-series registrations

Date	Filing		What it means
Jul 17, 2026	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Jul 10, 2026	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
May 18, 2026	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Apr 3, 2026	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Mar 27, 2026	S-1 →	REGISTERED	S-1 registration — capacity to sell shares, not a sale yet
Feb 25, 2026	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Feb 25, 2026	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Feb 23, 2026	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Jan 9, 2026	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Dec 30, 2025	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Mar 27, 2024	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Mar 25, 2024	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Mar 25, 2024	FWP →	MARKETING	Free-writing prospectus — offering being marketed
Jan 9, 2023	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Dec 29, 2022	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Feb 10, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Feb 8, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Dec 2, 2020	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Nov 20, 2020	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Sep 8, 2020	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Sep 8, 2020	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Aug 28, 2020	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Aug 3, 2020	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Dec 23, 2019	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Dec 20, 2019	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Dec 13, 2019	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Nov 13, 2019	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
Apr 21, 2017	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Mar 31, 2017	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Feb 27, 2017	8-K →	EXECUTED	Unregistered share sale disclosed (8-K item 3.02)
May 18, 2015	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
May 14, 2015	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Apr 27, 2015	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Dec 1, 2014	S-3 →	REGISTERED	S-3 registration — capacity to sell shares, not a sale yet
Nov 27, 2013	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Nov 25, 2013	424B4 →	EXECUTED	Final prospectus — offering priced (typical for IPOs and marketed share deals)
Nov 25, 2013	424B4 →	EXECUTED	Final prospectus — offering priced (typical for IPOs and marketed share deals)
Nov 21, 2013	S-1MEF →	REGISTERED	S-1MEF registration — capacity to sell shares, not a sale yet
Nov 21, 2013	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Nov 18, 2013	S-1/A →	REGISTERED	S-1/A registration — capacity to sell shares, not a sale yet

IPWR 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 IPWR workspace →

IPWR offering FAQ

When did IPWR last execute an offering?

Per SEC filings, Ideal Power Inc.'s most recent priced offering document is a 424B5 filed 2026-05-18. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did IPWR last announce or register an offering?

The most recent registration is a S-3 filed 2026-07-10. 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.

Free to use. No account, no card.